Final answer:
Water systems exceeding the lead action level must replace lead service lines at a rate of 7% annually following the enforcement of optimal corrosion control and source water treatment, as mandated by the EPA's Lead and Copper Rule.
Step-by-step explanation:
Lead and Copper Rule Requirements for Water Systems
Under the Lead and Copper Rule from the Environmental Protection Agency (EPA), if water systems continue to exceed the lead action level despite implementing optimal corrosion control treatment and source water treatment, they are required to replace lead service lines at a rate of at least 7% per year until lead levels are below the action level. Additionally, public water systems must ensure that proper public education about lead in drinking water is provided to consumers, and customers are notified if their water contains high levels of lead. The rule mandates these actions to protect public health from the toxic effects of lead contamination, which can cause serious health issues, particularly in children.
Water systems that continue to exceed the lead action level even after installing optimal corrosion control treatment and source water treatment have to implement additional measures under the Lead and Copper Rule. These measures may include increased water monitoring, implementing additional corrosion control strategies, and public education on lead exposure and prevention. The Lead and Copper Rule is a regulation implemented by the Environmental Protection Agency (EPA) to protect public health by reducing lead and copper levels in drinking water.