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4[[quoteright:350:[[VideoGame/Portal1 https://static.tvtropes.org/pmwiki/pub/images/2012-08-15_00002_-_Copy_350x350_7863.jpg]]]]
5[[caption-width-right:350:"The floor here will kill you. Try to avoid it."]]
6
7->''It's not the kind of water where you'd throw a [[Film/BackToSchool Triple Lindy]],\
8If you get some on your skin they probably notify your siblings''
9-->-- '''Music/AesopRock''' describes UsefulNotes/NewYorkState's waterways in "By The River"
10
11Water with a tainted color ([[WaterIsBlue usually not blue]]) that harms or kills the character upon contact. Usually explained as water with some kind of toxin in it, or (shudder) ''not'' water at all.
12
13It is a good way to make a video game character avoid pits of liquid without invoking SuperDrowningSkills or going as far as {{Lava Pit}}s. Usually appears in games with [[CoolClearWater regular swimmable water]] as well. Sometimes it is possible to clear up the grimy water to make it swimmable. Rarely, just the surface causes injury.[[note]]it is implied to be something floating on it that is harmful.[[/note]]
14
15Often involved in RiseToTheChallenge levels, as well as BubblegloopSwamp ones. The classic term, back before ''VideoGame/{{Marathon}}'' and ''VideoGame/DukeNukem3D'' introduced swimming, was "hurt floor", since these areas were effectively just floors that dealt damage.
16
17Not to be confused with HazardousWater (where the water doesn't deal damage directly but still poses a risk) or MuckingInTheMud. See also AcidPool, HollywoodAcid and LavaIsBoilingKoolAid. Inversion of HealingSpring.
18
19----
20!!Examples:
21
22[[foldercontrol]]
23
24[[folder:Action-Adventure]]
25* ''VideoGame/ActRaiser'': The purple water in the first act of Bloodpool causes instant death, needless to say.
26* ''Franchise/{{Castlevania}}'':
27** ''VideoGame/CastlevaniaIISimonsQuest'' has purple poisonous swamps that slow you down and eat away your life meter.
28** ''VideoGame/CastlevaniaSymphonyOfTheNight'': The water is perfectly clear, clean and pure, and at times [[SceneryPorn looks kind of pretty]]. It still hurts Alucard upon touching it though, without a special relic. Despite the relic looking like a snorkel, this ISN'T SuperDrowningSkills but apparently has to do with a myth about vampires not crossing running water. Richter, a human, has no problem with it.
29** ''VideoGame/Castlevania64'': All the water is poisonous, and literally dissolves the player like acid if (read: ''when'') you fall in.
30** ''VideoGame/CastlevaniaCircleOfTheMoon'' has purple water that hurts you when you touch it. It can be purified with the proper item, or just avoided with extremely judicious {{double jump}}ing. Or with the invincibility card combo.
31* ''VideoGame/TheLegendOfSpyroTheEternalNight'': The Ancient Grove is crossed by a river of bright purple poisonous water, alongside several smaller scattered pools of the stuff. Falling in it will harm Spyro in the same manner as falling into any other pit hazard in the game, and in some areas he must use his ice breath to create platforms across large stretches of this water.
32* ''Franchise/TheLegendOfZelda'':
33** ''VideoGame/TheLegendOfZeldaOcarinaOfTime'': The Royal Family's Tomb, the Bottom of the Well, and Bongo Bongo's boss arena in the Shadow Temple are all filled with green-and-blue ooze that's harmful for Link. In the former two areas, it's also a favorite spot for [=ReDeads=], which makes these parts even more difficult to tackle.
34** ''VideoGame/TheLegendOfZeldaMajorasMask'': Woodfall and Woodfall Temple are both flooded with bright purple water that harms you on contact. The latter is purified once you activate a certain mechanism inside the temple, while the swamp as a whole is cleansed by defeating the temple's boss. Even the "safe" part of the swamp waters are an unnatural white color before the curse is lifted.
35** ''VideoGame/TheLegendOfZeldaTheWindWaker'': Subverted. The Forbidden Woods are filled with filthy, purple-tinted water, but actually swimming in it poses no more danger than ordinary water does. Scooping some up in a bottle even confirms that it's just normal water, in terms of its properties.
36** ''VideoGame/TheLegendOfZeldaTwilightPrincess'': The boss of the Forest Temple resides in a pit filled with toxic purple water, despite the water in the rest of the dungeon being relatively clean. Defeating the boss will purify the spring and return the water to normal.
37** ''VideoGame/TheLegendOfZeldaSkywardSword'': The fourth dungeon, the Ancient Cistern, is a water treatment facility wherein the filtered impurities are stored in the basement, manifesting as pools of putrid purple goop that will curse Link on contact.
38** ''VideoGame/TheLegendOfZeldaBreathOfTheWild'': There are swamps of bubbling brown ooze in which Link will drown instantly if he is even partially submerged in it.
39** ''VideoGame/TheLegendOfZeldaTearsOfTheKingdom'': Zora's Domain is polluted with thick brown sludge that makes the Zoras ill, caused by the boss of the Water Temple. Even the map shows infected water as bright green. While swimming in the waters tainted with it does not harm Link, piles of it can be found along the ground that slows him down when he walks in it.
40* ''VideoGame/LegoBatmanTrilogy'': there is regular water which is quite swimmable and of course grimy water which will kill you instantly. The bad water is actually green toxic waste and is accessible when you have unlocked certain characters that are immune to the toxins. The same goes for the other superhero-based games like ''VIdeoGame/LegoMarvelSuperHeroes'' which also feature toxic water and toxic-immune characters.
41* ''VideoGame/LegoTheLordOfTheRings'': Ordinary water will kill you, but you have a chance of jumping out of it by [[PressXToNotDie tapping A]]. Swamp water, found in the Dead Marshes, will kill you instantly.
42* ''[[VideoGame/LEGOStarWars LEGO Star Wars II]]'' has two separate examples:
43** In a Tatooine level in ''Film/ANewHope'', there is an area dotted with moisture vaporators that has deadly pools of mud. A vaporator next to it, when activated, can suck the area dry and provide a walkable surface.
44** The Dagobah level is full of swampy water that will instantly kill most characters on contact. The exception is astromech droids like [=R2D2=], who like in ''Film/TheEmpireStrikesBack'' can travel across the bottom while keeping an "eye-stalk" above the water to see.
45* ''VideoGame/MediEvil'' gives us an entire level based around this known as the Pools of the Ancient Dead. While Sir Dan has SuperDrowningSkills and will lose a life bottle upon touching water anyway (being dead doesn't exactly do water for one's buoyancy, you know!), the entire level here is absolutely covered in this and falling in is all too easy thanks to the landscape and all of the exploding chests that, while they don't damage you outright, will do one worse and send you flying into the water.
46* ''VideoGame/{{Okami}}'':
47** In Tsuta Ruins, there is a very obvious (purple) lake of poison water. Amaterasu's ExpositionFairy prompts her to draw a lily pad on the water, which is instantly destroyed. Once you destroy the totems that are polluting the water, it immediately clears. The same purple water appears in other places as a course hazard. If Ammy falls in she dies instantly, with a howl that will haunt your dreams.
48** Later on there's a WombLevel where you have to use lily pads to move across a river of stomach acid. The acid functions just like water, except rather than costing you a unit of health if you stay in too long, it damages your health directly, and lily pads drawn on it will progressively shrink.
49* ''VideoGame/ShantaeAndTheSevenSirens'' has bodies of tainted water that will damage you for as long as you swim in it, easily told apart from regular water by its dark color and it emitting the same skull-shaped particles that you see over BottomlessPits. Using the Refresh Dance purifies the water, making it safe to swim in.
50* Stage 3 of ''VideoGame/SkateOrDie: Bad 'N Rad'' takes place on an oil platform with rising and falling oil that slows your board if you're on top of it and kills you if you fall into it.
51[[/folder]]
52
53[[folder:Action Game]]
54* ''Franchise/TombRaider'':
55** ''VideoGame/TombRaiderII'' has green insta-death water in one level and red in another. The red water was meant to be ''lava'', [[LavaIsBoilingKoolAid despite it being... well, red water.]] Made worse by the fact that a) when you fall in it, you stand up and ''then'' keel over and b) the very next level has proper instant burst-into-flames lava straight from the original ''Tomb Raider''.
56** ''VideoGame/TombRaiderIII'':
57*** The game has a variant, quicksand. Lara sinks very quickly unless it's a designated shallow spot, once submerged your breath meter goes down ''very'' quickly, and Lara is unable to climb out of the stuff.
58*** Falling into regular water on a vehicle results in it ''[[MadeOfExplodium exploding]]''.
59*** The penultimate level has stuff that didn't look like lava. More like bright gold paint. More like ''molten'' gold, given its [[IncendiaryExponent effect on you]].
60*** Some ponds of water have {{piranha|Problem}}s in it, which despite not working that way, will butcher Lara in less than three seconds if she is caught in a school of the stuff.
61*** The subzero arctic waters in the end of the game. While you can swim in it, the hazardous cold water is only survivable for a few seconds. Once your exposure meter is depleted, then your health drains fairly quickly. If you dive under the water, the meters drain even faster.
62*** The first and last boss arenas have "fire water" that kills you if you touch it.
63** ''VideoGame/TombRaiderUnderworld'' has glowing blue water in its final levels. Instant death if you so much as ''touch'' it. This would be [[http://en.wikipedia.org/wiki/Eitr eitr]], appropriate given the setting, and yes, it ''is'' that deadly.
64* ''VideoGame/{{Evolva}}'': Not the river water that appears in most levels, but the sea water that appears in levels 9 and 10. It drains life quite fast if you merely touch it, and diving into it causes instant death (in contrast to lava, which takes a few seconds to kill you). Oh, and the shield skill doesn't you protect you from it.
65* ''VideoGame/MassEffectAndromeda'' plays with it on Kadara, a planet plagued — among other issues — by its water supply being ludicrously toxic. A certain audio log details how a desperate exile took a sip against better judgment and died a quick but agonizing death when the stuff ravaged his innards in short order. Other [=NPC=]s are hospitalized after merely having been near a puddle. The water is still blue (an incredibly gorgeous shade of blue even, courtesy of the geothermal processes active around the lakes and puddles), but tip as much as your armored toe in it and Ryder's environmental hazard bar will instantly drop to zero and (s)he'll recoil in pain. Do it again and you'll be treated to the critical mission failure screen in less than a second. In a somewhat unusual twist for a video game, your squadmates aren't immune to this sort of environmental hazard either and will vocally cry out as well if they come into contact with the lethal soup.
66* ''VideoGame/{{Bayonetta}}'' has purple poison water, found in Chapter VI and underneath the arena Iustitia is fought in. Unlike electrified water in Chapter XII and the shallow pits of lava in Chapter III, the poison instantly kills both Bayonetta and the angels seen falling into it.
67[[/folder]]
68
69[[folder:Adventure Game]]
70* ''VideoGame/KingsQuestVI'' has a section with instant death water — entirely justified given the fact that it's in the Land of the Dead, and said death water is the water from the River Styx. ''VideoGame/KingsQuestMaskOfEternity'' also has instant death water in the Dimension of Death, along with harmful pools of blood in the same Dimension, plus toxic water from the Swamp (some of which is covering a small pond in Daventry). ''[[VideoGame/KingsQuestII King's Quest II]]'' also had the swamp and lake surrounding the vampire's castle. Instant death for Graham if he swims it, so he has to find a way to hitch a ride.
71* In ''VideoGame/TheBlackCauldron'', it is fatal to drink the green water in the moat of the Horned King's Castle.
72[[/folder]]
73
74[[folder:First-Person Shooter]]
75* The ''VideoGame/HalfLife'' series runs the gamut. There is the DamageOverTime scummy green radioactive contaminated water, which is replaced by a yellow goopy sewage-like water from the second game and on. It is your [[PoweredArmor HEV Suit]] that lets you survive contact as long as you get out fast. Radioactive waste is sometimes replaced with identical-looking biowaste. The difference is that while radioactive stuff triggers the Geiger counter and it does damage while you stand in it, biowaste has no audio warning and continues damaging for a while even after you leave it (and this damage is subtracted directly from your health, ignoring all armor). And of course there are the respective trefoil/biohazard signs on your HUD while you are being damaged.
76* ''VideoGame/{{Quake}}'' has both toxic waste and lava (which still [[LavaIsBoilingKoolAid behaves like water]]), as well as clear (and murky, but harmless) water.
77* ''[[VideoGame/{{Turok}} Turok 2: Seeds of Evil]]'' has two examples.
78** The River of Souls (which is both its own level, and extends through a couple others) is legendary for deadly properties: anything that drinks from or falls in the water dies instantly. Towards the end of the game, you find out that the river is polluted by discharge from the BigBad's spaceship, and you are tasked with purifying it towards the end.
79** The Death Marshes also have [[QuicksandSucks instant-death quicksand]], which looks similar to normal mud but has a greenish tint.
80* While [[SicklyGreenGlow green nukage]] and [[LavaIsBoilingKoolAid red-and-orange lava]] are always harmful in ''VideoGame/{{Doom}}'' and the [[WaterIsBlue extremely blue water]] is almost always harmless[[note]]exceptions being a lonely, conveniently marked-as-toxic blue water pool in ''Doom'' [=E3M3=] "Pandemonium" and a few maps in ''The Plutonia Experiment'' (Aztec, Ghost Town and Baron's Lair)[[/note]] , whether or not brown slime and [[RiversOfBlood blood]] are damaging varies [[DependingOnTheWriter depending on the whim of the level designer]]. With [[GameMod custom WADs]], no holds are barred: nukage and slime can be treated as algae-infested or plain muddy water, blue water can be {{electrified|Bathtub}}, icy, or actually liquid nitrogen or reactor coolant; blood can be poisonous, magical, boiling, or so harmless it can even be swum in; lava tends to be consistently damaging, however. A major exception in the classic episodes is [=MAP29=] of ''TNT: Evilution'', River Styx, where in addition to non-damaging rivers of blood, the level contains floors with harmless lava.
81* ''VideoGame/DukeNukem3D'' has puddles of radioactive waste that can be made walkable with a pair of special boots. Most of it isn't deep enough to be submerged, let alone swim. Strangely, if Duke dives into pools of waste that are deep enough, the liquid instantly becomes as harmless as water, going so far as to not drain the protective boots.
82* ''VideoGame/{{Unreal}}''
83** ''VideoGame/UnrealI'' was meant to feature light blue water-like nitrogen pools that hurt just as much as lava but can be waded into with an Asbestos Suit, but that was DummiedOut in the final release and can only be found in custom levels. The only thing that remained was the goopy green sludge from Tarydium refinement, which doesn't deal quite as much damage but is still hazardous enough to make escape all but impossible; a Toxin Suit negates all damage.
84** Almost all bodies of liquid in ''VideoGame/UnrealTournament'' either instantly kill players as soon as they fall in, or slowly damage them for as long as they're submerged. In some cases, this makes sense (lava in CTF-[=LavaGiant=]), in others not so much (the water in DM-[=KGalleon=]). The main reason behind it is to prevent players from wandering off the main playing area.
85* Three examples in ''VideoGame/TheConduit 2''. There's a small but lethal pool of glowing blue... [[BuffySpeak stuff]] in the first level that is otherwise mostly for show. The levels in Atlantis have electrified water that is instantly fatal. And lastly, the China level has this quicksilver-like liquid that will also kill Mr. Ford on contact.
86* In addition to lava pits like in the first two games, ''VideoGame/{{Descent}} 3'' has green acid/nukage that also damages your ship.
87* ''VideoGame/PlanetSide 2'''s Heyoka Chemical Lab facility is surrounded by a moat of toxic chemicals that can instantly kill anyone that walks further in than knee-deep. The moat can be crossed by HardLight bridges that only allow friendly vehicles to drive over safely, while enemy vehicles fall straight through. The bridges can be hacked to ReversePolarity, flipping its friend-or-foe identification. Much amusement can be had by tricking enemy tanks (or full [[AwesomePersonnelCarrier Sunderers]]) into trying to cross the bridges only to plunge straight through it, right into the toxic water. Or telling the [[MachineWorship Vanu Sovereignty]] players that their HoverTank can [[SchmuckBait hover over water]].
88* The fourth level of ''Franchise/StarWars: VideoGame/DarkForces'' has a rust-colored material near the end that damages your health, but wading through it provides a shortcut to your ship. The third level also plays with this with brown and green sewage that is safe to swim in and is required to be waded through to progress but is otherwise only dangerous because of the dianogas living in it.
89* ''VideoGame/{{Strife}}'' does this differently with green poisonous sewage and light blue reactor coolant. The grimy water isn't instantly hazardous, but it fills up a hidden toxicity meter, which you can notice by the screen turning green and foggy. After a certain threshold, the player starts taking damage, and will continue to take damage even immediately after leaving the hazardous area or putting on a hazard suit; it only stops after toxicity drops below the threshold.
90* ''VideoGame/Halo4'': In the level "Reclaimer", you eventually reach a stream that is both colored green and giving off steam. MissionControl dubs it "bad news" and orders you back on the [[AwesomePersonnelCarrier Elephant]]. The elephant can ford it just fine, but not only will it kill you if you try to do so on foot, other vehicles (including ''tanks'') will ''explode'' upon contact. Bad news indeed.
91[[/folder]]
92
93[[folder:MMORPG]]
94* In ''VideoGame/TheLordOfTheRingsOnline'', up in the frozen lands of Fornost, going into the water instantly causes death, perhaps due to freezing. You can enter other water just fine, it's just the water in the arctic type area that is deadly. In the same game, Angmar has bright green water that is instantly fatal.
95* ''VideoGame/GuildWars'', where some water (mostly in Kryta, and then more often in ''Factions''' Undercity) inflicts poison on you. Walking in actual ''sewer'' water (which is a dull bronze color), strangely, usually has no effect.
96* In ''VideoGame/WorldOfWarcraft'':
97** Swimming in green water such as the kind found in Undercity and Scourge ziggurats used to cause damage overtime, though it was rather minor and very easy to get out of. The damage was removed in ''Cataclysm'', but the stuff in Naxxramas still applies a debuff that harshly lowers your stats.
98** In Serpentshrine Cavern in ''The Burning Crusade'', the water in the central hub spawns fish that attack anyone who falls into it (hazardous at the raid's intended level, but a minor annoyance in later expansions), while the water in Lady Vashj's room is scalding hot.
99** In Highmaul in ''Warlords of Draenor'', the water around Brackenspore's area is acidic. The Iron Horde grunts trying to fight him back learn this the hard way when they attempt to retreat through the water and immediately die.
100** Also in ''Warlords of Draenor'', huge areas of Tanaan Jungle are covered in green snot-looking 'fel sludge', which depending on the depth of it will do nothing, give you a minor bit of damage, or a stacking buff/debuff that raises both your damage dealt and damage taken, but kills you immediately at 10 stacks.
101* In ''VideoGame/FusionFall'', large green pools of "Fusion Matter" lurk in many of the regular and infected areas. Swimming in, walking through, and even sometimes walking NEAR these pools causes the player to take damage.
102* While only present in one room in one level, ''VideoGame/{{Elsword}}'' has a swamp with ankle-deep purple water. The level's mobs are able to stand in it and not take damage (since you're in their home turf), but players take steady poison damage as well as lose MP while standing in it, making it essentially a mad dash between the sporadic patches of dry land and platforms.
103[[/folder]]
104
105[[folder:Platform Game]]
106* ''VideoGame/HeyPikmin'': Several areas of [[BubblegloopSwamp the Lushlife Murk]] and the Final Stretch are covered by pools of bright purple liquid, which will instantly kill Olimar or the Pikmin should they fall into them.
107* ''Franchise/{{Metroid}}'': Occurs in all the games.
108** ''VideoGame/Metroid1'' and ''VideoGame/MetroidZeroMission'': The "water" in Norfair is highly acidic and damages you until you get out. The Varia upgrade removes the hazard. This unhealthy water returns in ''VideoGame/SuperMetroid''.
109** ''VideoGame/MetroidPrimeTrilogy'':
110*** ''VideoGame/MetroidPrime'': The main boss of Chozo Ruins, Flaahgra, is filling the water with toxins, and when it is defeated the water stops causing damage.
111*** ''VideoGame/MetroidPrime2Echoes'': You're harmed by the water in [[DarkWorld Dark Aether]], where [[EverythingTryingToKillYou everything is lethal]].
112*** ''VideoGame/MetroidPrime3Corruption'': The yellow, boiling fluid in planet Bryyo looks like lava, but is actually Fuel Gel, a volatile substance widely used as spaceship fuel. This is why touching it is harmful for Samus even with the Varia Suit, requiring an additional powerup (the Hazard Shield) to fully negate its effects.
113** ''VideoGame/MetroidIIReturnOfSamus'' and ''VideoGame/MetroidSamusReturns'': The games didn't even make a pretense of calling the fluid on [=SR388=] water; it is acidic, toxic, and generally lethal. The only way to remove the hazard is to drain the stuff, which in turn requires hunting down the nearby Metroids.
114** ''VideoGame/SuperMetroid'': There is no suit which protects you from the acid in Lower Norfair. The Varia Suit prevents you taking damage from Upper Norfair's lava, but the acid is still a problem even with the Gravity Suit. In ''Zero Mission'', the acid in Brinstar becomes safe to travel through with the Varia Suit, the lava in Norfair is safe with the Gravity Suit, and the acid in Tourian is ''never'' safe.
115** ''VideoGame/MetroidFusion'': Sector 4 (AQA) features electrified water, which causes continual damage if you fall in. Draining the water removes the hazard. There are also a few rooms in Sector 1 (SRX) that have pools of green acid.
116* ''VideoGame/BanjoKazooie'':
117** Whenever you encounter water that's an odd colour in the series, there's often something living in it. One such example is the piranhas in the waters of BubblegloopSwamp and the level's entrance area in Gruntilda's Lair. Banjo and Kazooie can traverse them safely with the Wading Boots, while the crocodile transformation (provided by Mumbo) makes them completely immune.
118** [[ShiftingSandLand Gobi's Valley]] includes untouchable sand, dangerous not because it would suck you in, but because it includes irritable [[SandIsWater sand eels]].
119** [[BigBoosHaunt Mad Monster Mansion]] includes what could best be described as a pool full of ''haunted water'' (the game does not explain why the purplish liquid harms you). Oddly, you are protected from this damage if you're an adorable pumpkin.
120** Rusty Bucket Bay has a variation: Banjo can swim in the polluted water, but the oxygen meter depletes even while swimming on the surface and twice as quickly underwater. This level also has a small area on land that is full of glowing green waste and toxic barrels. Contact with the waste is not instant death, but it damages instead. Similar technicolor goop is found in the second floor of Grunty Industries in ''Tooie''; maybe that's where all the toxic waste came from.
121** The freezing water in Click Clock Wood winter uses the same mechanic as the oily water in Rusty Bucket Bay (it doesn't drain your oxygen at the surface, but you can only surface at two points anyways). The water in [[SlippySlideyIceWorld Freezeezy Peak]] just mocks you while it drains your health.
122* ''VideoGame/BanjoTooie'':
123** In the cream-colored pools of quicksand in Mayahen Temple, as well as the muddy green fluids in Terrydactyland and the brown waste surrounding Grunty Industries and its level entrance (Quagmire in Isle O' Hags), there are Dragundas that swallow Banjo and Kazooie once they fall within, and then spat back. Strangely, in all cases, it seems the only reason why the polluted goo is dangerous is because of the Dragundas who live in it, not because it's toxic.
124** The freezing water in the icy side of Hailfire Peaks just damages you outright instead, due to being even colder. On the fiery side, the one pool of water you find is boiling and will scald you if you try to dive without protection.
125* ''VideoGame/DonkeyKongCountry3DixieKongsDoubleTrouble'' puts a twist on the formula with toxic water with no effect other than the player's directional pad is reversed, so you must press left to swim right.
126* Occurs quite a bit in various ''Franchise/SuperMarioBros'' games:
127** ''VideoGame/SuperMarioWorld'': There's boiling-hot mud present in two levels of Chocolate Island, which is capable of killing Mario and Luigi instantly. Functionally, it's just recolored lava.
128** ''VideoGame/SuperMario64'': The second ice world you come to has two types of water, both harmful: one is swimmable, but because of the freeziness of it, it slowly drains your life rather than [[GameBreaker help you to replenish it]]. The other is cold enough to act exactly like lava and forms the backdrop of a boss battle.
129** ''VideoGame/SuperMarioSunshine'':
130*** The lake in Bianco Hills is polluted in the sixth episode. The source of the pollution is a cave located in the northwest frontier, behind the penninsula of the largest windmill. Entering the cave leads to an obstacle course.
131*** In Ricco Harbor, Gooper Blooper pollutes some of the water with his ink. The water literally deals a hit a second, barely giving you any time to either jump out or dive down lest you get stuck.
132*** In Noki Bay, the otherwise crystal-clear water is horribly polluted from an eel in ''desperate'' need of a dentist. Only the surface is harmful, and since several of the levels there give you a suit that lets you stay underwater longer, it's actually ''safer'' to just swim under the water when you have to go in.
133*** The Lily Pad Ride, a secret obstacle course with the 8 red coins hovering right above a transparent water that kills Mario instantly upon contact. The lily pad you're riding to cross the water safely also erodes after some time, so you have to grab the coins (or at least reach the end) quickly to avoid sinking.
134** ''VideoGame/NewSuperMarioBros'': In the forest and jungle worlds featured in the subseries, there's a purplish, toxic water that is fatal upon contact, regardless of Mario's current form. The way to cross over it depends on the level: Sometimes you can ride Dorrie (who's immune to the water's toxicity), and other times you ride a platform that can only tolerate a certain threshold of weight before stopping.
135** ''VideoGame/SuperMarioGalaxy'': There's a level accessible from the Kitchen where the water is so toxic that falling into it results in instant death as the player watches Mario stick his hand out and garble under the muck before drowning; the only way to traverse the swamp is by hovering around with a bubble. Both the original game and ''VideoGame/SuperMarioGalaxy2'' also have pools of [[OurDarkMatterIsMysterious dark matter]] that cause Mario to disintegrate upon making contact with them and can create holes in space that cause platforms to disappear while under them.
136** ''VideoGame/SuperMario3DLand'': There's at least one underground level with boiling purple sludge that kills Mario on contact in a manner similar to lava, only with purple smoke burning Mario's rear instead of fire.
137** ''VideoGame/SuperMario3DWorld'': Along with continuing the trend of purple, instant-kill poison, the game has certain levels full of what looks like ''blue'' lava.
138** ''VideoGame/SuperMarioOdyssey'': The whole water that surrounds Lost Kingdom and extends to the horizon is toxic, so falling into it is a fatal mistake. Some obstacle courses and bonus areas have toxic water as well, being equally deadly
139** ''VideoGame/SuperMarioMaker2'': In forest levels set during nighttime, water becomes toxic and cannot be touched without losing a life. It is colored green in the ''Super Mario Bros.'' style, and purple in the other game styles (except that of ''Super Mario 3D World'', since it's only possible to make daytime forest levels there). As with lava and water, it can raise and/or lower its height if the level's creator allows it.
140** ''VideoGame/MarioPartyStarRush'': Bridgesaw Puzzle tasks the players with crossing a river of poisonous purple water often found in the jungle settings of the Mario platformers. Players accomplish this by selecting a series of tiles with the correct shapes to fit together and build a bridge across.
141** ''VideoGame/PaperMarioStickerStar'' has World 3, a forest that's covered in dark purple poison, which damages Mario when he steps in it and randomly hurts him if he enters battle in it. The poison vanishes after the world's boss is defeated.
142** ''VideoGame/PaperMarioColorSplash'': The waters of Plum Park end up poisoned courtesy of Petea Piranha and takes on a lovely lavender colour. Of course, falling into it deals some damage to Mario. Defeating Petea will restore the park's water to its pristine glory.
143** ''VideoGame/MarioAndLuigiDreamTeam'': Somnom Woods marks yet another appearance of purple, toxic water, with the notable addition that it's now ''electric''. Like lava or spikes, it doesn't actually damage Mario or Luigi, and it's instead used to reset their position in the platforming areas.
144* ''VideoGame/SuperMarioFusionRevival'': World 4-[=HC2=], Poison Aqueduct. The level is a stealthy entrance into Hellfire Citadel itself by forging a path through its aqueducts. However, the aqueducts are filled with toxic liquids.
145* ''VideoGame/TheLegendaryStarfy'' series:
146** In ''VideoGame/DensetsuNoStafy4'', Tear Lake has one level with purple patches of water caused by the water filtration system being broken, which deal damage to Starly when she touches them. They vanish once the filtration system is working again.
147** In the fifth game (the one actually called ''The Legendary Starfy'' in official translation), most of the waters in Sogwood Forest are weirdly bubbly and of an unhealthy purple colour. Needless to say, Starfy must better not touch those poisoned waters, else he would be damaged.
148* In ''Franchise/RatchetAndClank'' games, clear water is safe to swim in. Murky water always contains Lombax-eating fish.
149** ''VideoGame/RatchetAndClank'':
150*** An obstacle course level had pools of clear water with those very fish. You usually had to drain the water and kill the fish, then fill it back up or they would eat you. Also, freezing cold water will instantly freeze Ratchet to death, and the poor furry guy can't swim in mud or poison goo, he simply sinks.
151*** In Gemlik Base, during the section where you walk on the left side of the room with the Magneboots, there is a rising and sinking orange liquid that will cause Ratchet to fall off the path if it touches him.
152*** There are two occasions where the water you need to swim through is electrified, and you can only temporarily turn off the current, making the entire traversal a TimedMission.
153*** Strangely enough, Ratchet is capable of jumping out of the opaque goo in almost every level of the first and second games in the series, but will drown if he falls back in two more times. In ''[[VideoGame/RatchetAndClankUpYourArsenal Up Your Arsenal]]'', it kills him instantly.
154** ''VideoGame/RatchetAndClankGoingCommando'': The main path in Notak ends in a puzzle where you have to freeze and thaw the rising and falling fish-filled water to progress.
155** ''VideoGame/RatchetAndClankUpYourArsenal'': The Obani Draco level is the same as Gemlik Base, except instead of causing Ratchet to fall off, a bug causes him to enter his sinking animation, which counts as a kill.
156* ''VideoGame/{{Rayman}}'':
157** The series does this as well. However, in those games, it seems as if the only thing that separates "swimmable" water from the "piranha-infested" kind is the presence of a sign. Starting with ''Revolution'', you can see fish jumping out. But only near walkable regions, so they can drop on your head and bite you.
158** In ''VideoGame/RaymanOrigins'', water is sometimes unsafe to be in for more than a second because it's infested with Darktoons or {{piranha|Problem}}s.
159* The ''Franchise/SpyroTheDragon'' series, at least the Insomniac-produced ones, occasionally have this.
160** In the first game, all 'water' was this — even apparently clean, fresh water coming out of fountains. In ''Spyro 2'' and ''3'', Spyro can paddle (and dive into) water if it is clear, but not if it is coloured or murky. Interestingly, oxygen isn't an issue, and Spyro can breathe indefinitely underwater.
161** One level in the second game has green water that you can walk on while using the invincibility power-up.
162** ''VideoGame/SpyroYearOfTheDragon'' and ''VideoGame/SpyroAHerosTail'' both have a level where you have to use the invincibility powerup to swim in toxic water.
163%%* Ink serves this purpose in ''VideoGame/DeBlob''.
164* ''VideoGame/JakAndDaxter'':
165** The electrified water in Lost Precursor City from the first game (though it damages instead of killing instantly), which bears an unnaturally bright green hue and has odd yellow lines occasionally showing up.
166** There were occasional muddy waters in the first and second game. In the latter, you can hover over it (as well as the Dark Eco) once you acquire the Jetboard, which is needed to grab some Precursor Orbs.
167* ''Franchise/SonicTheHedgehog'':
168** The "Mega Mack" from the Chemical Plant Zone in ''VideoGame/SonicTheHedgehog2'' (16-bit) doesn't kill you on impact (in practical terms, it's just regular water), but it plays hell with Sonic's OxygenMeter: there aren't any air bubbles for Sonic or Tails to use to replenish their air supply!
169** Several levels in ''VideoGame/ShadowTheHedgehog'' have some form of this: parts of Prison Island are flowing with a hazardous yellow-green liquid, Central City and Space Gadget have bodies of dark green liquid, and Black Comet is flooded with a burgundy and teal substance that is functionally one big bottomless pit. In every case, you're provided with vehicles to navigate them.
170* Muddy waterfalls in the Meadows of ''VideoGame/SpikesPeak''.
171* ''VideoGame/JettRocket'' has two variations of this. The water in the first world is safe swimming. In the second world, the water is freezing, and while you can swim in it, it saps your rather limited health ''very'' quickly. In the third world, it will suck you into it and make you lose health, but you can wade through it for a little bit before this happens.
172* ''VideoGame/CrashBandicoot'': Occurs quite often in some of the games, but because of Crash and Coco's SuperDrowningSkills, it's not much different from regular water... at least usually. [[VideoGame/CrashBandicoot2CortexStrikesBack The second game]] has sewer levels with ankle-deep water, and an electric eel that can electrify the water at regular intervals, at which moment you have to be out of it.
173* ''VideoGame/{{Croc}}: Legend of the Gobbos'' has icy water that you can't swim in, as well as lava. However, you can swim in certain areas of light blue water, which is necessary to rescue certain Gobbos.
174* In ''VideoGame/EpicMickey'', all bodies of water have been replaced by paint thinner, which damages Mickey upon contact (as he is made of paint like everyone else) and forces a small leap up. He has no MercyInvincibility, and the hops are quick, so if Mickey gets tossed out too far, it's certain death. There are also 2D stages based on Mickey's past cartoons. Normal water exists in some of these stages, but Mickey reacts to them the same way he does to thinner.
175* ''VideoGame/OriAndTheBlindForest'' contains murky, poisoned water that damages Ori when you attempt to swim in it. It's not until the completion of the first dungeon when the water in the game becomes safe to swim through. The area leading up to Mount Horu has instant-death volcanic hot spring water. [[VideoGame/OriAndTheWillOfTheWisps The sequel]] likewise has purple swamp water as a result of TheCorruption overtaking Niwen, requiring Ori to reactivate the Wellspring to clear it, with darker water causing more rapid HP loss, and later, instantly lethal tar and [[TheCorruption liquid Corruption]] pits in the Silent Woods and [[TheVeryDefinitelyFinalDungeon Willow's End]], respectively.
176* ''VideoGame/MichaelJordanChaosInTheWindyCity'': Acid (which looks like glowy green water) appears in a few of the [[EternalEngine Factory levels]]. Mike has to hit the levers to lower the Acid level which allows him access to further areas in the level. Touching the Acid kills you instantly.
177* In ''[[VideoGame/{{Skylanders}} Skylanders: SWAP Force]]'', Motleyville has ponds and streams of what appears to be raw sewage that causes continuous damage, while Kaos' Fortress has green ooze with the same effect.
178* ''VideoGame/HollowKnight'' has bubbling acidic water with the same effect on the Knight as SpikesOfDoom, booting them back to the nearest platform minus a mask for taking damage, unless they have acquired Isma's Tear, which allows them to swim through it without harm.
179* In ''VideoGame/AHatInTime'', the thick, purple swamp water in Subcon Forest is a variant: stepping on it will summon hands that will try to pull you down and progressively restrict your movement until you're pulled below or you get back to dry land.
180* In ''VideoGame/MegaMan11'', Pipettos can use the [[AcidAttack corrosive solutions]] in their bodies to corrupt the pools in Acid Man's stage; if the water turns green, it means that pool has become acidic and Mega Man will take damage if he falls in.
181In ''VideoGame/MichaelJordanChaosInTheWindyCity'', Acid (which looks like glowy green water) appears in a few of the Factory levels, and is an insta-kill upon touching it. MJ has to hit the levers to lower the Acid level which allows him access to further areas in the level.
182* A section of Shade Man's level in ''VideoGame/Rockman7EP'' is filled with toxic water. There's a meter that indicates Mega Man's toxicity. His skin even changes to match the toxicity.
183* ''VideoGame/{{Ratatouille}}'' for the Platform/PlayStationPortable has this happen for two of its sewers levels. Auguste Gusteau will warn you if said water isn't safe to swim in.
184[[/folder]]
185
186[[folder:Puzzle Game]]
187* ''VideoGame/{{Portal}}'' has poison water, which kills you if you don't get out of it quickly — an unlikely escape, since it would require you to fall in near a portal surface and swim out through a portal. It is stated by [=GLaDOS=] that contact with it results in "an unsatisfactory mark on your official testing record, followed by death." In ''VideoGame/Portal2'', it is known as deadly goo, kills instantly, and is presumably highly acidic since [=GLaDOS=] calls it acid — and one sign shows a silhouette of a person whose lower body is disintegrated beneath the surface of the liquid.
188* Poisoned water in ''VideoGame/WheresMyWater'', which is handily colored [[TechnicolorToxin purple]]. One drop and it completely poisons clear water, and if it gets to Swampy's shower... well, it doesn't seem to hurt him, but he's grossed out all the same. Furthermore, it dissolves algae and explodes when combined with green ooze, both of which occasionally come in handy for clearing obstacles. In the Cranky levels, the goal is to get poisoned water to his home so it can clear algae from his food.
189[[/folder]]
190
191[[folder:Real Time Strategy]]
192* A rare RTS example occurs in ''VideoGame/TotalAnnihilation''. One tileset features acidic water that damages any units which try to slog through it. Sadly, this isn't enough of a deterrent for the [[ArtificialStupidity AI]]...
193[[/folder]]
194
195[[folder:Roguelike]]
196* ''[[VideoGame/AncientDomainsOfMystery ADOM]]'' has a puzzle at the bottom of the Tomb of the High Kings. A red lake surrounds a small room that contains a ring you need to get past an NPCRoadblock. Swimming in the red lake will get you torn apart by hundreds of chaos piranhas, so you need to find some other way to cross.
197[[/folder]]
198
199[[folder:Role-Playing Game]]
200* In general, many games made in UsefulNotes/RPGMaker have this, as there's a tile that resembles purple water that damages characters standing on it. The damage usually isn't that severe, though.
201* All the water in ''VideoGame/Fallout3'' is irradiated, save for a very few places. You can still swim and drink from it, but will need to deal with the ensuing radiation poisoning afterward.
202** If you have ''Broken Steel'' and released the [[SyntheticPlague Modified FEV]] into the water, the virus-laced Aqua Pura will adversely affect your stats and ultimately kill you if you consume a certain amount.
203** The Monongahela River in ''The Pitt'' has the most irradiated water in the game, with up to 600 rad/sec. Swimming here is a death wish.
204** ''VideoGame/FalloutTactics'' is much worse; the water is obviously irradiated and glows with an ominous sickly green glow.
205** ''[[VideoGame/FalloutNewVegas New Vegas]]'' reverses the trend, in that (on top of the expected "clean" and "dangerous" types) there's somewhat natural looking silt-tinged water that's completely safe to drink, and absolutely pure and clean looking water that's absolutely lousy with radiation. The only real way to tell is to stop and wait to see if your Geiger counter starts clicking before taking a drink/hopping in.
206* ''VideoGame/BahamutLagoon'' has "poison swamps". They can be turned into regular swamps by casting healing magic on them.
207* This is the whole MacGuffin plot of the SNES RPG, ''VideoGame/{{Lagoon}}''.
208* ''VideoGame/DemonsSouls'':
209** The second stage of The Valley of Defilement is covered with this. Not only is the player unable to dodge when walking through it, but extended exposure causes ''poison''.
210** The third stage of The Valley of Defilement also has ''plague'' swamps. They wanted to give players something to hate more than the poison swamps, it would seem.
211* ''VideoGame/DragonQuest'':
212** In ''VideoGame/DragonQuestVIII'', there are a few areas (such as a segment in the Black Citadel) where the player can walk through what appears to be purple water. Doing so slowly damages the entire party.
213** In ''VideoGame/DragonQuestIII'', the Charlock Castle, where [[BigBad Zoma]] awaits for the Hero and his Party, is surrounded by purple, poisonous swampy water. The access to Gaia's Pit and the Dark World is also encircled by a toxic purple swamp.
214** Poisonous swamps appear throughout the series, but the only game where you can actually ''die'' from its damage is ''VideoGame/DragonQuestI''; sequential titles will never let your party's health fall below 1HP.
215** This feature is useful in ''VideoGame/DragonQuestIX'', as there is a side quest which requires you to heal allies from exactly 1 HP several times... good luck getting monsters to drop you to exactly 1 HP, unless you have a lot of Defense and a lot of patience!
216* The Blood Priest in ''VideoGame/{{Wasteland}}'' is found in the middle of a lake of blood. The water doesn't hurt you (if you can swim)... but the fish do.
217* In ''VideoGame/XenobladeChronicles1'', the aptly named Poison Swamp in Satorl Marsh damages anyone who wades through its sickly purple water, but only by about 4% of their max HP every few seconds. The off-colored water at the [[spoiler:Fallen Arm and Mechonis Field]] causes a significantly larger amount of damage, despite not looking nearly as dangerous as the swamp, though it mostly exists to keep you from swimming too far out into the ocean and to punish you for falling. Lastly, the glowing green pools of liquid ether [[spoiler:inside the Bionis]] look dangerous, ''and'' will kill you very quickly; a fact one of the bosses tries to exploit by knocking your characters around and inflicting them with status effects that cause them run around uncontrollably or keep them from moving.
218* In ''VideoGame/XenobladeChroniclesX'', In addition to the usual [[LethalLavaLand lava]] in Cauldros, is one area with pools of glowing multicolored liquid that is said to be phosphorus. Walking into it unprotected hurts faster than the lava. [[JungleJapes Noctilum]] also has a few reddish toxic ponds here and there.
219* In ''VideoGame/XenobladeChronicles2'', all of the water is purple and toxic in [[DeathWorld Temperantia]] and [[spoiler:Spirit Crucible Elpys]], and some unique monsters are situated near these pools. Correct positioning of your party is important for these, as [[ArtificialStupidity your AI-controlled party members will see no problem with wading right into these waters to attack.]]
220* ''VideoGame/EarthBound1994'' has a poisonous swamp that slowly damages anyone walking through. Except this one's called Deep Darkness and the water is murky. The sewer water in Fourside is harmless, though Ness and co. are similarly forced to wade through it.
221* In ''VideoGame/HolyUmbrella'', though SuperNotDrowningSkills are ordinarily in play, it's still a bad idea to take a flying leap into the [[WombLevel Gastric Sea]] (the Emperor Dondera does just that in a cutscene).
222* In ''VideoGame/MegaManBattleNetwork1'', the third scenario features Lan and [=MegaMan=] investigating why all of the water in town has dried up. When it comes back, the water is now [[TechnicolorToxin purple and poisonous]], but one guy delirious from dehydration doesn't notice and falls ill after drinking from a tainted fountain.
223* Hinted at in ''VideoGame/PokemonGoldAndSilver'' — the pool of water in Celadon City (which previously had normal Water-types in ''[[VideoGame/PokemonRedAndBlue Red and Blue]]'') is now full of Grimer and Muk, Poison-types who thrive in tainted water. You can still Surf on it without your Pokémon getting poisoned, but the implications of the city suffering from pollution is a bit of a MoodWhiplash.
224* In ''VideoGame/GenshinImpact'', the electricity-themed region of Inazuma has a few areas with electrified purple water that causes continuous damage to characters who swim in it.
225[[/folder]]
226
227[[folder:Third-Person Shooter]]
228* {{Double Subver|sion}}ted in ''Franchise/{{Splatoon}}''[='=]s Salmon Run mode. This mode takes place in restricted ocean zones where the water is a sickly shade of toxic green... and otherwise doesn't seem very different from normal water. Except, this is ''Splatoon'', where [[SuperDrowningSkills Inklings and Octolings dissolve in water]].
229* In ''VideoGame/{{Warframe}}'', most of the water on the Plains of Eidolon at night is contaminated with something that causes Magnetic damage to both players and [=NPCs=] that walk into it, though fish have no problems living in it.
230[[/folder]]
231
232[[folder:Turn-Based Strategy]]
233* ''VideoGame/FinalFantasyTactics'': Swampland is harmful, and any units that finish their turn while standing in the water will be Poisoned (treading water and climbing out onto solid ground has no ill effects.)
234* ''VideoGame/FinalFantasyCrystalChronicles'': The swampland level — Conall Curach — has got noticeably murky water that causes damage when you stand in it.
235* ''VideoGame/FireEmblemGaiden'': Swamp tiles are often quite vast in the few maps they appear in, and they harm units standing on it for about 3~5HP of damage every time their army's phase begins while standing on it. Swamp tiles also have a high movement cost (how many move points it takes to traverse it; the higher the value, the shorter distance that unit can go on that terrain), which makes it quite time-consuming (and unsafe) for a ground unit to cross.
236[[/folder]]
237
238[[folder:Wide Open Sandbox]]
239* In ''VideoGame/GrandTheftAutoIII'' and ''VideoGame/GrandTheftAutoLibertyCityStories'', the water surrounding the city is extremely polluted, to the point where it takes on a thick, slimy, dark texture and a very dark blue color. The reason for this is supposedly industrial pollutants mixed with a massive oil spill, thus creating water so grimy, [[SuperDrowningSkills it's fatal to anyone who tries to swim in it]].
240* In the later ''VideoGame/SimCity'' games, severely polluted water is brown.
241* In ''VideoGame/SecondLife'''s Linden Realms, there is pale green and purple water that will send you to the nearest respawn point if you fall in.
242* In ''VideoGame/CitiesSkylines'', dumping sewage in a river results in a slowly dispersing brown streak traveling downstream. If you were dumb enough to build your freshwater facilities downstream from your sewage pipes, don't be surprised at your city's health levels plummeting soon after. The same can happen due to pollutants released by industrial zones near bodies of water.
243* ''VideoGame/{{Subnautica}}'': Your PlayerCharacter is well-equipped to survive underwater, but in the Lost River biome hundreds of meters below the suface, you must be careful of brine. This sulfur-yellow liquid is much denser than seawater, so it flows in streams and pools along the seafloor. Evidently it is highly caustic, because dipping into it will steadily erode your health.
244[[/folder]]
245
246!!Non-video game examples:
247
248[[folder:Films -- Animated]]
249* In ''WesternAnimation/TheLorax2012'', befitting the CrapsaccharineWorld setting, the water in Thneedville is indicated to be irradiated in the first few minutes when one kid goes swimming and comes out glowing green.
250* In ''WesternAnimation/TheSimpsonsMovie'', Homer builds a silo to house [[RoadApples his new pig's waste]] and is told to get rid of it when it starts overflowing. Rather than dispose of it at a proper facility, he drops it into the recently-cleaned Lake Springfield, causing it to become even more polluted than before; the water briefly turns black with a skull and crossbones bellowing "Evil!" in a deep voice and is later shown to have become mutagenic, which is what leads to the town being sealed under a dome.
251[[/folder]]
252
253[[folder:Films -- Live-Action]]
254* ''Film/GrizzlyRage'': The characters stumble onto a river of grimy water polluted by toxic waste. It's implied it caused the Grizzly bear to mutate.
255* ''Film/SixReasonsWhy'': The Sherpa and The Entrepreneur are ecstatic when they find a lake in the middle of the ThirstyDesert of The Badlands, but The Nomad tells them it is contaminated by toxic chemicals from the old coal mine and will kill them within two days if they drink it.
256[[/folder]]
257
258[[folder:Literature]]
259* Due to earthquakes striking the city, the nearby rivers and lakes in ''Literature/{{Survivor|Dogs}}s'' are contaminated. Fish survive in it but it has a rank smell and an off, green or even ''rainbow'' look to it. This bad water is what causes the Leashed Pack to try and sneak into the Wild Pack's territory; they have control of a clean lakeshore.
260* The River Ankh in ''Literature/{{Discworld}}'' is the most polluted river in the world, sometimes described as only being a liquid because it moves slightly faster than everything else. It's home to fish, but nobody knows what they look like because they explode on contact with any transparent medium. In times of drought, the citizens can technically walk across the river on the crust that forms; they don't, since like ice, it can have thinner places that will break under them.
261[[/folder]]
262
263[[folder:Live-Action TV]]
264* ''Series/{{MXC}}'', the comically re-dubbed version of ''Series/TakeshisCastle'', often features a muddy brown water that many contestants fall into in the various challenges. The water is given a [[{{Squick}} disgusting]] name, every time it appears, like "septic sludge" or "toilet flushings from the Air Force One", often depending on who the contestants are. The original ''Takeshi's Castle'' with the Craig Charles narration claims that this is runoff from a nearby pig farm in southern Japan.
265[[/folder]]
266
267[[folder:Webcomics]]
268* Land of Wind and Shade in ''Webcomic/{{Homestuck}}'' has ''oceans'' of oil, polluted by its denizen Typheus. John apparently avoids entering it at all costs (and walkarounds treat it like walls), but then again most characters in that comic generally avoid going into any deep body of liquid.
269* The Dyne river from ''Webcomic/GirlGenius'' glows at its source spring and touching the water can kill a person or drive them mad while deforming their bodies. The castle uses up the spring's odd properties for power so the river that flows through Mechanicsburg is safe to touch. The Heterodynes built Mechanicsburg at the site of the river's current origin after one of their ancestors ''drank the water from the spring'' and survived it.
270[[/folder]]
271
272[[folder:Web Animation]]
273* ''WebAnimation/HelluvaBoss'': All the water that can be seen in the Pride Ring is polluted beyond all reason, no doubt from all the various chemicals and dead bodies thrown into it without a care.
274[[/folder]]
275
276[[folder:Web Original]]
277* The Website/SCPFoundation has a few:
278** [[http://www.scp-wiki.net/scp-242 SCP-242]] is a swimming pool that causes anything placed into it to dissolve into sterile water.
279** [[http://www.scp-wiki.net/scp-676 SCP-676]] is a hot spring that causes whatever is put into it to dissolve within a few seconds. Even radioactive markers disappear, suggesting that it occurs at the ''subatomic'' level.
280[[/folder]]
281
282[[folder:Western Animation]]
283* ''WesternAnimation/CampLazlo'':
284** In one episode, Raj gets a cheese wheel made with water from the Kafizzle River. He uses it as a plaything instead of eating it because the river is acidic and eating the cheese would kill the imbiber within hours, so when [[{{Jerkass}} Lumpus]] eats it and thinks he's dying, the rest of the episode is him enjoying his last day alive... until it turns out the cheese was made in China and he wasn't going to die after all.
285** In another episode, Clam gets sick and falls in love with Gretchen. One of the methods proposed to cure him is a soup made with water from Raj's Kafizzle River snow globe, which makes it [[AteTheSpoon strong enough to eat through the earth]].
286* ''WesternAnimation/FamilyGuy'':
287** In "It Takes a Village Idiot, and I Married One", the Griffins go swimming in a lake that turns out to be polluted by toxic dumping, causing their hair and Brian's fur to fall out. After Lois briefly becomes mayor and agrees to let an oil company resume dumping in the lake, the pollution makes Jake Tucker's ordinarily upside-down face turn rightside-up.
288** In "Brian the Closer", Brian scams Quagmire into buying a crappy, dilapidated shack after making it appear better than it actually was. When Peter opens the window, an old man in a neighboring building tells them that the harbor is poisoned.
289* On ''WesternAnimation/KimPossible'', Ron's HilariouslyAbusiveChildhood had him spending one summer at [[AbandonedCampRuins Camp]] [[IDontLikeTheSoundOfThatPlace Wannaweep]], where among other things, the lake was clearly toxic. Years later, it turned out to have mutagenic properties and even once brought an army of [[{{Snowlems}} snowmen to life]] when its waters were used to [[WeatherControlMachine create artificial snow]].
290* The eponymous water in ''WesternAnimation/ThePiratesOfDarkWater'', quite naturally, as the rare case of ''not water at all.''
291[[/folder]]
292
293[[folder:Real Life]]
294* Large bodies of stagnant water, such as those you see in [[BubblegloopSwamp swamps]], are generally to be avoided. Water is a perfect breeding ground for all manners of bacteria, and if it's not being changed or cycled that bacteria has a chance to develop and breed to toxic quantities.
295* Conversely, ponds and lakes with clear, sparkling water are often deceptive: their clarity may not be a sign of "purity" at all, but rather biological toxins, pollution, low oxygen levels, or other issues that have left the water so pretty and clear by killing every living thing in it.
296* Raw sewage is sometimes so toxic that having it touch exposed skin will require a full decontamination.
297* The [[https://en.wikipedia.org/wiki/Flint_water_crisis Flint water crisis]] started during a botched transfer of water services in Flint, Michigan, resulting in water so contaminated with lead and bacteria that it became toxic to drink.
298* The name of the city of Winnipeg, Manitoba, comes from a Cree word meaning "muddy water." The name originally described Lake Winnipeg, 65 km north of the city, but is an equally apt description of the Red and Assiniboine Rivers the city lies on.
299[[/folder]]

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