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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).
EPA illustration of lead sources in residential buildings Infographic about lead in drinking water. The Lead and Copper Rule (LCR) is a United States federal regulation that limits the concentration of lead and copper allowed in public drinking water at the consumer's tap, as well as limiting the permissible amount of pipe corrosion occurring due to the water itself. [1]
The US Environmental Protection Agency (EPA) regulates the allowable levels of some contaminants in public water systems. [29] There may also be numerous contaminants in tap water that are not regulated by EPA and yet potentially harmful to human health.
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.
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 ...
* 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 ...
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.
The CWA requires EPA and the states to prepare reports to Congress on the condition of the nation's waters. [24] Ambient water quality data collected by EPA, the US Geological Survey and other organizations are available to the public in several online databases. [25]
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