Now in the ChatGPT app store
Use TapWaterMap right inside ChatGPT
TapWaterMap is now an app in ChatGPT. Ask about any US city's tap water and get the EPA's own records in plain English, right in the chat.
What you can ask
- “What's in Burlington, Vermont's tap water?”
- “Compare the tap water in Austin, TX and Denver, CO.”
- “Which cities have health-based nitrate violations?”
- “What is TTHM, and does the EPA classify it as health-based?”
How it works
The app runs on the same public data engine as this site — the EPA's SDWIS records for ~19,000 US cities. Every answer reports what the EPA recorded — never a safety verdict, and the absence of a violation is not a guarantee of safety.
On Claude or another assistant?
The same service is available as a public MCP connector for Claude and any MCP client. See the Developers page.