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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]
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).
In 2016, more than 5,000 drinking water systems were found to be in violation of the lead and copper rule. [56] Congress passed the Reduction of Lead in Drinking Water Act in 2011. This amendment to the SDWA, effective in 2014, tightened the definition of "lead-free" plumbing fixtures and fittings. [57]
The lead and copper rule improvements would require utilities to replace lead service lines within 10 years regardless of the lead levels that register in water samples.
Joe Cotruvo, a former director of the Drinking Water Standards Division at EPA, said the existing regulations work and should be credited with significantly reducing lead in drinking water, they ...
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Drinking water quality standards describes the quality parameters set for drinking water. ... no limit listed Lead Pb 0.01 mg/L 10 μg/L 15 μg/L* 10 μg/L
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