County Water Quality Report

Pima County, Arizona

2 public water systems serving 1,280,906 residents

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
County average grade
D
65/100
Utilities rated 2
Population served 1,280,906
Most recent test 2024

Top water quality concerns in Pima County

  • Arsenic significantly above health guidelinein 1 of 2 utilities
  • Haloacetic acids (HAA9) significantly above health guidelinein 1 of 2 utilities
  • Total trihalomethanes (TTHMs) significantly above health guidelinein 1 of 2 utilities
  • Haloacetic Acids (HAA5) significantly above health guidelinein 1 of 2 utilities
  • Chromium-6 detectedin 1 of 2 utilities

All utilities in Pima County

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

C
70/100

Tucson Department of Public Works

Tucson · 548,000 residents

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

View report →
D
60/100

TUCSON CITY OF

TUCSON · 732,906 residents

Top concern: Arsenic significantly above health guideline

View report →