◉wateratlasCALIFORNIA
◌ Anonymous community data
COMMUNITY-SOURCED WATER PARAMETERS

What's in your tap water?

Explore water test results across California. Share your own measurements without sharing your name or exact address.

Showing community readings
CONTRIBUTE A READING

Add your water test

Only enter values you've measured. Leave anything untested blank.

◌ Your privacy matters. We publish only your selected community and test measurements. No name, email, exact address or GPS location is requested.

Enter your California town, even if it isn't in the suggestions. Pins show the approximate town center only.

MEASURED PARAMETERS Enter at least one

New readings are checked for spam and remain hidden until a moderator approves them. Values are self-reported.

About Water Atlas

This community project helps people compare tap-water test readings across California. Measurements are contributed by individuals, not verified by a lab.

For privacy, locations are displayed near a community center with a small visual offset. No names, email addresses, street addresses, or GPS coordinates are collected in the submission form.

Important: Anonymous public submissions can be inaccurate or deliberately false. Don't use these reports to determine whether water is safe to drink. For official water quality information, check your water provider's Consumer Confidence Report.