Site Information | The public drinking water systems that EPA, and delegated states and tribes, regulate provide drinking water to 90 percent of Americans. These public drinking water systems, which may be publicly- or privately-owned, serve at least 25 people or 15 service connections for at least 60 days per year. Through the Public Water System Supervision (PWSS) program, EPA implements and enforces drinking water standards to protect public health. Below we have listed some of the activities that EPA, states, and tribes undertake to regulate public water supplies. EPA does not regulate drinking water wells that supply water to fewer than 25 people.
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