Water quality rankings · EPA data
Which cities have the worst tap water?
Honest, data-driven rankings built from public U.S. EPA records — PFAS detections, contaminants on file, and our 0-100 Water Score. Pick a list, find your city, and see exactly what's on the record.
Arizona
Arizona Cities With PFAS Detected in Their Water
Arizona communities where PFAS — the 'forever chemicals' — have been detected in the public water supply, based on EPA UCMR5 monitoring.
See the ranking→Arizona Cities With the Most Contaminants on Record
Arizona public water systems with the most distinct contaminants on the EPA record, ranked.
See the ranking→Arizona Cities With the Lowest Water Scores
Arizona cities whose tap water scores lowest on our 0-100 Water Score, derived from EPA records.
See the ranking→Utah
Utah Cities With PFAS Detected in Their Water
Utah communities where PFAS 'forever chemicals' have been detected in the public water supply, based on EPA UCMR5 monitoring.
See the ranking→Utah Cities With the Most Contaminants on Record
Utah public water systems with the most distinct contaminants on the EPA record, ranked.
See the ranking→Utah Cities With the Lowest Water Scores
Utah cities whose tap water scores lowest on our 0-100 Water Score, derived from EPA records.
See the ranking→See what's actually in your water
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