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

Water System Implementation Resources

This page provides resources to assist drinking water system owners and operators in complying with drinking water regulations.

Guidance documents by regulation:

Chemical contaminants

Microbial contaminants

Right-to-know rules

There is small system guidance developed to help states, technical assistance providers, and small systems identify their compliance options.