County Water Quality Report

San Bernardino County, California

17 public water systems serving 2,124,095 residents

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
County average grade
D
60/100
Utilities rated 17
Population served 2,124,095
Most recent test 2024

Top water quality concerns in San Bernardino County

  • Haloacetic acids (HAA5) significantly above health guidelinein 15 of 17 utilities
  • Arsenic significantly above health guidelinein 10 of 17 utilities
  • Haloacetic acids (HAA9) significantly above health guidelinein 9 of 17 utilities
  • PFAS contaminationin 6 of 17 utilities
  • Perfluorohexane sulfonate (PFHXS) significantly above health guidelinein 5 of 17 utilities

All utilities in San Bernardino County

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

B
77/100

SAN BERNARDINO VALLEY WD

SAN BERNARDINO · 109,608 residents

Top concern: Chromium (hexavalent) significantly above health guideline

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D
64/100

CUCAMONGA VALLEY WATER DISTRICT

RANCHO CUCAMONGA · 211,069 residents

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

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D
64/100

SAN GABRIEL VALLEY WC - FONTANA

FONTANA · 237,700 residents

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

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D
63/100

LIBERTY UTILITIES (AV RANCHOS) CORP.

DOWNEY · 64,469 residents

Top concern: Arsenic significantly above health guideline

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D
62/100

MONTE VISTA WD

MONTCLAIR · 56,017 residents

Top concern: Arsenic significantly above health guideline

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D
62/100

CHINO HILLS, CITY OF

CHINO HILLS · 76,414 residents

Top concern: Arsenic significantly above health guideline

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D
62/100

UPLAND, CITY OF

UPLAND · 78,376 residents

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

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D
62/100

VICTORVILLE WATER DISTRICT

VICTORVILLE · 135,983 residents

Top concern: Arsenic significantly above health guideline

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D
62/100

EAST VALLEY WATER DISTRICT

HIGHLAND · 108,629 residents

Top concern: Haloacetic acids (HAA9) significantly above health guideline

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D
59/100

San Bernardino Municipal Water System

San Bernardino · 222,000 residents

Top concern: Arsenic significantly above health guideline

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D
59/100

CHINO, CITY OF

CHINO · 86,435 residents

Top concern: Arsenic significantly above health guideline

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D
57/100

HESPERIA WD

HESPERIA · 100,744 residents

Top concern: PFAS contamination

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D
55/100

ONTARIO MUNICIPAL UTILITIES COMPANY

ONTARIO · 185,010 residents

Top concern: PFAS contamination

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F
53/100

WEST VALLEY WATER DISTRICT

RIALTO · 104,498 residents

Top concern: PFAS contamination

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F
53/100

RIALTO, CITY OF

RIALTO · 54,453 residents

Top concern: PFAS contamination

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F
52/100

REDLANDS CITY MUD-WATER DIV

REDLANDS · 78,025 residents

Top concern: PFAS contamination

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F
48/100

SAN BERNARDINO CITY

SAN BERNARDIN0 · 214,665 residents

Top concern: PFAS contamination

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