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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]
The level of ions generated has been reported to be usually below EPA Safe Water Drinking Act Lead and Copper Rule AL for copper. [3] The AL for copper in potable water is 1.3 ppm (Cu) and the SCL for silver is 0.1 ppm (Ag) (which is the same as 100 ppb). It is important to collect and handle samples correctly in order to get accurate results.
Under the LCR, if tests show that the level of lead in drinking water is in the area of 15 ppb or higher, it is advisable—especially if there are young children in the home—to replace old pipes, to filter water, or to use bottled water. EPA estimates that more than 40 million U.S. residents use water "that can contain lead in excess of 15 ppb".
If more than 10% of tap water samples exceed the lead action level (or the copper action level of 1.3 ppm), the supplier must take additional steps to control corrosion. Other actions may include installation of treatment, checking of source water, removal of lead-containing plumbing, and public education.
Drinking water quality standards describes the quality parameters set for drinking water. Water may contain many harmful constituents, yet there are no universally recognized and accepted international standards for drinking water. Even where standards do exist, the permitted concentration of individual constituents may vary by as much as ten ...
The suggested safe level of copper in drinking water for humans varies depending on the source, but tends to be pegged at 1.3 mg/L. [2] So low is the toxicity of copper that copper(II) sulfate is a routine reagent in undergraduate chemistry laboratories. [3]
A number of states have sought to step up scrutiny, although water authority advocates say the money and the expertise are what is really lacking for a sector of more than 50,000 water utilities ...
The rule does not assume that there is a "safe" level of exposure, but notes that 15 ppb is an "action level" where utilities must take action. [1] The rule was created in 1991, after research showed that drinking water could account for one-fifth of all lead intake. [1]
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