Find a community water system

Search every New Hampshire community water system with a current nitrate result. Open a system to see its latest reading, reporting date, nitrate band and population served.

system with a current result

428

people served by them

system carrying a supplier result

systems at or above 5 mg/L

How to read the directory: each system is placed in a band by its most recent reported result in the rolling three-year window. Purchased-water systems carry their supplier's result and are tagged. Bands describe how strongly human activity, read from nitrate, has marked a water source; they are not a safety verdict.

Showing 1 of 1 system

W Stewartstown Water Pctpurchased waterNatural background0.25 mg/LAug 2025428 served

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NitrateSmart

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

Results reaching back to July 2023 · current through August 9, 2026.

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Educational information, not medical or personal safety advice.