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Maximum contaminant levels (MCLs) are standards that are set by the United States Environmental Protection Agency (EPA) for drinking water quality. [ 1 ] [ 2 ] An MCL is the legal threshold limit on the amount of a substance that is allowed in public water systems under the Safe Drinking Water Act (SDWA).
Parts 141, 142, and 143 regulate primary contaminants, implementation by states, and secondary contaminants. Primary contaminants are those with health impacts. State implementation allows states to be the primary regulators of the water supplies (rather than EPA) provided they meet certain requirements.
The Safe Drinking Water Act (SDWA) is the primary federal law in the United States intended to ensure safe drinking water for the public. [3] Pursuant to the act, the Environmental Protection Agency (EPA) is required to set standards for drinking water quality and oversee all states, localities, and water suppliers that implement the standards.
* means action level; not a concentration standard. A public water system exceeding the action level must implement "treatment techniques" which are enforceable procedures. [14] ** TT (treatment technique). The public water system must certify that the combination of dose and monomer level does not exceed: acrylamide = 0.05% dosed at 1 mg/L (or ...
This required the EPA and state underground injection control programs to regulate hydraulic fracturing under the SDWA. The EPA responded with a study of potential and actual impacts of hydraulic fracturing of coalbed methane wells on drinking water, published in 2004. Section 7.4 of the report "concluded that the injection of hydraulic ...
EPA maintains the Contaminant Candidate List (CCL), a list of substances which are being considered for possible regulation in the federal drinking water program. [10] In an effort to assess the importance of certain substances as contaminants, the National Primary Drinking Water Regulations have required some public water systems to monitor ...
The downgrade was due to higher E. coli levels from stormwater run-off. Other factors, such as the threat of climate change leading to more droughts or heavier rains in the region, can also affect ...
After section 208's failure to control NPS water pollution, in 1987 Congress passed the Water Quality Act which included a new section 319 to address the problem of nonpoint sources. [30] This provision, also non-regulatory, authorizes EPA to fund demonstration programs and provide technical assistance to state and local governments.
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