There have long been concerns about what happens when airplanes dump Phostex, a mix of ammonium phosphate, emulsifiers, and colorants to fight wildfires.  The main chemical in the retardant — ammonium phosphate — is known to poison fish and other aquatic life, including vulnerable species like Chinook salmon. Now, Forest Service Employees for Environmental Ethics — a nonprofit that represents current and former Forest Service employees — is suing the Forest Service over its use. They allege that the federal agency has violated the Clean Water Act by dumping the flame-stopping chemicals into waterways.

LINK (via Grist)