County Water Quality Report

Ventura County, California

5 public water systems serving 682,279 residents

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
County average grade
D
63/100
Utilities rated 5
Population served 682,279
Most recent test 2024

Top water quality concerns in Ventura County

  • Haloacetic acids (HAA5) significantly above health guidelinein 4 of 5 utilities
  • Haloacetic acids (HAA9) significantly above health guidelinein 4 of 5 utilities
  • Arsenic detectedin 2 of 5 utilities
  • Lead detected in source waterin 1 of 5 utilities
  • Haloacetic Acids (HAA5) significantly above health guidelinein 1 of 5 utilities

All utilities in Ventura County

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

C
71/100

City of Oxnard Water Department

Oxnard · 207,000 residents

Top concern: Lead detected in source water

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D
64/100

VENTURA WATER DEPARTMENT

VENTURA · 113,500 residents

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

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D
64/100

VENTURA WWD NO. 8 - SIMI VALLEY

SIMI VALLEY · 94,738 residents

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

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D
59/100

OXNARD WATER DEPT

OXNARD · 200,232 residents

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

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D
59/100

CAL AMERICAN WATER CO

ROSEMEAD · 66,809 residents

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

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