The majority of Americans are provided high-quality drinking water. About 90% of people in the United States get their water from a community water system. The U.S. Environmental Protection Agency (EPA) sets regulations for treating and monitoring drinking water delivered by community water systems. Water quality standards and monitoring requirements are in place for more than 90 contaminants.
About 10% of people in the United States rely on smaller water supplies (mostly household wells) that are not regulated by EPA. Treatment and monitoring requirements for these small systems vary from state to state. Drinking water protection programs at the state and national levels play a critical role in ensuring high-quality drinking water and in protecting the public's health.
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