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EPA Water Testing

The Environmental Protection Agency (EPA) tests the levels of various household and industrial chemicals that are found in our drinking water supply. Ensuring that drinking water is safe is one of the goals included in the EPA's strategic plan under "Protecting America's Waters."

  1. Testing Frequency

    • By July 1 of every year, homeowners receive a short report from their water supplier. This report offers information about water sources and contaminants that may or may not be present, and provides contact information for questions or concerns. Renters of townhouses or those with wells do not receive this information, but may ask to have their water tested.

    Testing Methods

    • Water suppliers must use approved analytical methods to test drinking water. The EPA and other government agencies, as well as universities, water laboratories and manufacturers, develop the methods. This ensures that the testing requirements and procedures are uniform.

    Findings

    • Water is tested for high levels of harmful chemicals or substances. For example, a rural area may show a high level of nitrates, whereas a city sample may show a high level of chloride. Phosphates from dish detergent are harmful in too high a level.

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