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Toxic Water is a poisonous liquid found in some games. It's commonly purple or dark green, and, in most appearances can defeat Mario instantly, like Lava.
History
Super Mario series
Super Mario Sunshine
In Super Mario Sunshine, Toxic Water appears in a Secret Area found within Delfino Plaza. In this area, Mario must ride on a leaf down the Toxic Water in order to collect eight Red Coins. Also worth noting is that in certain episodes of Bianco Hills and Noki Bay, the water is polluted and can still hurt Mario, but cannot instantly defeat him.
New Super Mario Bros.
In New Super Mario Bros., Toxic Water can be found throughout several stages, mostly in World 4. Dorrie is the only character that is resistant to poison water.
New Super Mario Bros. Wii
In New Super Mario Bros. Wii, the toxic water ponds are found throughout several stages in World 5. Mega Wigglers are the only thing that appear to be immune to Toxic Water in this game. To traverse the ponds, Mario must use trunks in World 5-3 and a raft in World 5-4.
Super Mario Galaxy
In Super Mario Galaxy, Toxic Water appears in Bubble Breeze Galaxy as well as Toy Time Galaxy's Purple Coin challenge.
Super Mario Galaxy 2
In the sequel, it is present in three galaxies. It first appears in Cloudy Court Galaxy's Silver Stars in the Purple Pond mission. In Boo Moon Galaxy, Mario must use Snake Blocks to cross the poison water. It appears last in Mario Squared Galaxy, just like in Toy Time Galaxy.
Donkey Kong Series
Donkey Kong Country
In Donkey Kong Country, the level Poison Pond takes place in a greenish toxic pond. Although, it's harmless to Donkey Kong and Diddy Kong, just like water.
Donkey Kong Country 2: Diddy's Kong Quest
In Donkey Kong Country 2: Diddy's Kong Quest, a poisonous liquid appears quickly rising in Toxic Tower. If Rattly, Squawks or Squitter stay in the toxic water for some seconds, they will lose health.
Donkey Kong Country 3: Dixie Kong's Double Trouble
In Donkey Kong Country 3: Dixie Kong's Double Trouble, Poisonous Water appears in Poisonous Pipeline. This time, the poison inverts the controls to move Dixie Kong and Kiddy Kong. Jumping out of the poison, the apes instantly back to normal controls.