County Water Quality Report

Maricopa County, Arizona

19 public water systems serving 8,739,762 residents

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
County average grade
D
61/100
Utilities rated 19
Population served 8,739,762
Most recent test 2024
🇪🇺 Would fail EU standards 1 of 19

Top water quality concerns in Maricopa County

  • Arsenic significantly above health guidelinein 13 of 19 utilities
  • Haloacetic acids (HAA9) significantly above health guidelinein 9 of 19 utilities
  • Chromium-6 detectedin 7 of 19 utilities
  • Chromium (hexavalent) significantly above health guidelinein 6 of 19 utilities
  • Haloacetic Acids (HAA5) significantly above health guidelinein 6 of 19 utilities

All utilities in Maricopa County

Click any utility for full grade card, contaminant data, and treatment plant contact info.

B
80/100

Chandler Department of Public Works

Chandler · 261,000 residents

Top concern: Haloacetic Acids (HAA5) significantly above health guideline

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B
76/100

Scottsdale Municipal Water System

Scottsdale · 258,000 residents

Top concern: Haloacetic Acids (HAA5) significantly above health guideline

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B
75/100

City of Mesa Water Department

Mesa · 518,000 residents

Top concern: Haloacetic Acids (HAA5) significantly above health guideline

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C
74/100

Gilbert Municipal Water System

Gilbert · 268,000 residents

Top concern: Haloacetic Acids (HAA5) significantly above health guideline

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C
74/100

Glendale Department of Public Works

Glendale · 248,000 residents

Top concern: Haloacetic Acids (HAA5) significantly above health guideline

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D
63/100

Phoenix Water Authority

Phoenix · 1,680,000 residents

Top concern: Lead detected in source water

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D
62/100

City of Phoenix Water Services Department

Phoenix · 1,660,000 residents

Top concern: Arsenic significantly above health guideline

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D
62/100

EPCOR - AGUA FRIA

SURPRISE · 127,718 residents

Top concern: Arsenic significantly above health guideline

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D
60/100

QUEEN CREEK TOWN OF

QUEEN CREEK · 95,502 residents

Top concern: Arsenic significantly above health guideline

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D
60/100

MESA CITY OF

MESA · 466,000 residents

Top concern: Arsenic significantly above health guideline

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D
60/100

PEORIA CITY OF

PEORIA · 187,676 residents

Top concern: Arsenic significantly above health guideline

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D
59/100

PHOENIX CITY OF

PHOENIX · 1,695,000 residents

Top concern: Arsenic significantly above health guideline

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D
57/100

CHANDLER CITY OF

CHANDLER · 247,328 residents

Top concern: Arsenic significantly above health guideline

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D
57/100

GLENDALE CITY OF

GLENDALE · 234,766 residents

Top concern: Arsenic significantly above health guideline

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D
57/100

SCOTTSDALE CITY OF

SCOTTSDALE · 241,361 residents

Top concern: Arsenic significantly above health guideline

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F
49/100

LIBERTY WATER LPSCO

LITCHFIELD PARK · 55,810 residents

Top concern: PFAS contamination

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F
47/100

AVONDALE CITY OF

AVONDALE · 83,001 residents

Top concern: PFAS contamination

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F
47/100

GILBERT, TOWN OF

GILBERT · 247,600 residents

Top concern: PFAS contamination

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F
47/100

TEMPE CITY OF

TEMPE · 165,000 residents

Top concern: PFAS contamination

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