What is an action level and a 90th percentile value?
The specified action level for Lead is 0.015 milligrams per liter (mg/L) and the action level for Copper is 1.3 mg/L. These action levels represent the concentration of Lead or Copper in drinking water above which a water system may be required to complete corrective actions such as installing treatment. Compliance with the Lead and Copper rule is determined by comparing the 90th percentile of results (which is a statistical calculation performed by DES) with the established Federal Action Level (“AL”). These calculations are found online within your public water system information page. Please be aware that if the 90th percentile exceeds the AL for either Lead or Copper in the first round, you must stop additional sampling and we will be in contact with further instructions. The goal is to ensure that no more than 10 percent of the population served has Lead or Copper present in amounts above the action level by comparing it to the calculated 90th percentile value.
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