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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]
In June 2004, the EPA cited WASA for a "serious breach" of the law, including withholding six test results showing high lead levels in 2001, dropping half of the homes that had previously tested high for lead levels in subsequent testing, and avoiding homes known to be at high risk for contamination. [16]
For example, homes built before 1986 — when the federal government banned the use of leaded pipe and solder in new plumbing system construction — may or may not have lead lines in them.
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".
The diagram shows the typical location of a lead service line, which runs from a residence's water meter to the Des Moines Water Works water main. Lead pipes are more likely to be found in older ...
Federal rules for lead and copper in water go by 90th percentile readings. All test samples are ranked from highest levels of lead to the lowest; the total number of tests taken is multiplied by ...
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