An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Drinking Water Tools

The Drinking Water tools assist with analyzing drinking water data.

Safe Drinking Water Information System (SDWIS)

SDWIS provides information about the quality of drinking water. Read more about SDWIS.

Water Contaminant Information Tool (WCIT)

WCIT contains information on chemical, biological, and radiological contaminants that may potentially pose a threat to drinking water. Read more about WCIT.

Water Utility Response On The Go

Water Utility Response On The Go is a mobile tool that allows water utilities to respond to emergency incidents. Read more about Response OTG.