Topic · EPA SDWIS
Water quality by ZIP code
Every community water system (CWS) in the United States reports violations, lead-copper results, and treatment data to the EPA. zipradar federates that feed per ZIP code.
Last verified 2026-04-24 · methodology
What zipradar shows
Pages show the CWS serving the address, any health-based violations in the last 3 years, most recent lead and copper sampling result, and a link to the primary SDWIS record.
Refresh cadence
Quarterly (federal mandate). zipradar honors the regulator's publishing cadence; stale data is flagged rather than silently served.
Limitations
Where a ZIP is served by multiple water systems, zipradar shows the dominant CWS by population served and lists alternates. Private well water is not covered.
Primary source
Look up water quality by ZIP
ZIP 10001
New York, NY
Water quality →
ZIP 11201
Brooklyn, NY
Water quality →
ZIP 10016
Manhattan (Murray Hill), NY
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ZIP 02108
Boston, MA
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ZIP 02139
Cambridge, MA
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ZIP 19103
Philadelphia, PA
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ZIP 15222
Pittsburgh, PA
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ZIP 20001
Washington, DC
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ZIP 07302
Jersey City, NJ
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ZIP 06103
Hartford, CT
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ZIP 60601
Chicago, IL
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ZIP 60614
Chicago (Lincoln Park), IL
Water quality →