Find a community water system

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

systems with a current result

20,323

people served by them

systems 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 4 of 4 systems

Central Beach Fire DistrictHuman impact clear4.48 mg/LJun 2026470 served

Harmony Hill School, Inc.Natural background0.79 mg/LApr 2026199 served

Quonochontaug East Beach Water AssociatiHuman impact clear4.86 mg/LSep 2023300 served

University of Rhode IslandNatural background0.11 mg/LSep 202419,354 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.