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Water records human impact.
Nitrate is how you read it.

Check your community water system and how it compares.

Nitrate is a signal, not the whole picture. Low nitrate is good news, but not a clean bill of health.

Your address matches you with your community water system. How matching works

Where the data comes from

USGS
Nitrate background and geology
peer-reviewed
U.S. EPA
10 mg/L federal limit
regulation
State Programs
Compliance sampling
measured
Iowa health studies
5 mg/L benchmark
observational
NitrateSmart

Nitrate in community water systems, from the utilities’ own compliance reporting.

Results reaching back to July 2023 · current through —.

Data & methods

How this is built
Coverage and gaps

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NitrateSmart

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