Draft 2009 Update Aquatic Life Ambient Water Quality Criteria for Ammonia-Freshwater

Riepilogo

Pursuant to section 304(a) of the Clean Water Act (CWA), the Environmental Protection Agency (EPA) is announcing the availability of draft national recommended water quality criteria for ammonia for the protection of aquatic life. The draft criteria are based on EPA's Guidelines for Deriving Numerical National Water Quality Criteria for the Protection of Aquatic Organisms and Their Uses (1985), (EPA/R-85- 100). EPA's recommended section 304(a) water quality criteria provide guidance to States and authorized tribes in adopting water quality standards for protecting aquatic life and human health and provide guidance to EPA for promulgating Federal regulations under CWA section 303(c), when such action is necessary.