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The U.S. Environmental Protection Agency’s Lead and Copper Rule regulates the presence of lead in drinking water. Under the rule, if more than 10 percent of samples test above 15 parts per billion, the federal lead “action level” is exceeded. An “action level” exceedance triggers mandatory requirements that a water system must perform. For Newark, these requirements include water quality monitoring, corrosion control treatment, source water monitoring and treatment, public education, and lead service line replacement. Newark must treat its water to guard against corrosion (pipe erosion and damage) to minimize lead “leaching” (when lead is dissolved from pipes or fixtures and transfers into the water) or flaking of small lead particles from pipes or fixtures into tap water.