Regulacje i polityka gospodarcza · 02/11/1999

National Primary Drinking Water Regulations; Radon-222

In this action, the Environmental Protection Agency (EPA) is proposing a multimedia approach to reducing radon risks in indoor air (where the problem is greatest), while protecting public health from the highest levels of radon in drinking water. Most radon enters indoor air from soil under homes and other buildings. Only approximately 1-2 percent comes from drinking water. The Agency is proposing a Maximum Contaminant Level Goal (MCLG) and National Primary Drinking Water Regulations (NPDWR) for radon-222 in public water supplies. Under the framework set forth in the 1996 amendments to the SDWA, EPA is also proposing an alternative maximum contaminant level (AMCL) and requirements for multimedia mitigation (MMM) programs to address radon in indoor air. Public water systems (PWS) are defined in the Safe Drinking Water Act (SDWA). This proposed rule applies to community water systems (CWS), a subset of PWSs. Under the proposed rule, CWSs may comply with the AMCL if they are in States that develop an EPA- approved MMM program or, in the absence of a State program, develop a State-approved CWS MMM program. This approach is intended to encourage States, Tribes, and CWSs to reduce the he