National Recommended Water Quality Criteria for the Protection of Human Health

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Pursuant to section 304(a) of the Clean Water Act (CWA), the Environmental Protection Agency (EPA) is announcing the availability of updated national recommended water quality criteria for the protection of human health for the following fifteen pollutants: chlorobenzene; cyanide; 1,2-dichlorobenzene; 1,4-dichlorobenzene; 1,1- dichloroethylene; 1,3- dichloropropene; endrin; ethylbenzene; hexachlorocyclopentadiene; lindane; thallium; toluene; 1,2-transdichloroethylene; 1,2,4- trichlorobenzene; and vinyl chloride. The criteria are based on EPA's 2000 methodology for deriving human health water quality criteria and supercede criteria for these chemicals that the Agency published before this notice. EPA's recommended section 304(a) water quality criteria are guidance to States and authorized Tribes in adopting water quality standards for protecting human health. They are also a scientific basis for developing controls of discharges or releases of pollutants. They are guidance to EPA for promulgating Federal regulations under CWA section 303(c), when such action is necessary. Under the CWA and its implementing regulations, States and authorized Tribes are to adopt water quality criteria