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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]
EPA has set standards for over 90 contaminants organized into six groups: microorganisms, disinfectants, disinfection byproducts, inorganic chemicals, organic chemicals and radionuclides. [12] States and territories must implement rules that are at least as stringent as EPA's to retain primary enforcement authority (primacy) over drinking water.
A former EPA official described it as "widespread fraud and manipulation" on the part of water utilities. [16] That July, however, an EPA administrator told Congress that "we have not identified a systemic problem." [16] Using data from the EPA, the Post identified 274 utilities that had reported unsafe lead levels between 2000 and 2004. [16]
If TCLP analytical results are below the TCLP D-list maximum contamination levels (MCLs) the waste can be accepted. If they are above these levels the waste must be taken to a hazardous waste disposal facility and the cost of disposal may increase from about $50.00/ton to as much as $1200.00/ton.
EPA first listed MTBE in 1998 as a candidate for development of a national Maximum Contaminant Level (MCL) standard in drinking water. [43] The agency listed MTBE on its Contaminant Candidate List in 2022 but has not announced whether it will develop an MCL. [44] EPA uses toxicity data in developing MCLs for public water systems. [45]
For methylmercury, the US Environmental Protection Agency (US EPA) has estimated a safe daily intake level of 0.1 μg/kg body weight per day. [ 19 ] The National Institute for Occupational Safety and Health (NIOSH) recommends that exposures to mercury metal be limited to an average of 0.05 mg/m 3 over a 10-hour workday in addition to a ceiling ...
The Agency first listed MTBE in 1998 as a candidate for development of a national Maximum Contaminant Level (MCL) standard in drinking water. [33] EPA included MTBE on its most recent Contaminant Candidate List in 2022 but has not announced whether it will develop an MCL. [34] [35] EPA uses toxicity data in developing MCLs for public water ...