An official website of the United States government.

Due to a lapse in appropriations, EPA websites will not be regularly updated. In the event of an environmental emergency imminently threatening the safety of human life or where necessary to protect certain property, the EPA website will be updated with appropriate information. Please note that all information on the EPA website may not be up to date, and transactions and inquiries submitted to the EPA website may not be processed or responded to until appropriations are enacted.

We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Drinking Water Requirements for States and Public Water Systems

State Resources for Implementing Drinking Water Rules

Water Supply Guidance (WSG)

The WSG is a compilation of policy decisions pertaining to implementation issues under the Safe Drinking Water Act.

Drinking Water State Revolving Fund

The Drinking Water State Revolving Fund (DWSRF) program is a federal-state partnership to help ensure safe drinking water. Drinking water state revolving fund program guidance provides information to states.

Guidance documents by regulation:

Chemical contaminants

Microbial contaminants

Right-to-know rules

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