County Water Quality Report

San Francisco County, California

2 public water systems serving 1,730,019 residents

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
County average grade
D
66/100
Utilities rated 2
Population served 1,730,019
Most recent test 2024

Top water quality concerns in San Francisco County

  • Haloacetic acids (HAA9) significantly above health guidelinein 1 of 2 utilities
  • Haloacetic acids (HAA5) significantly above health guidelinein 1 of 2 utilities
  • Total trihalomethanes (TTHMs) significantly above health guidelinein 1 of 2 utilities
  • Arsenic detectedin 1 of 2 utilities
  • Lead detected in source waterin 1 of 2 utilities

All utilities in San Francisco County

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

C
67/100

SFPUC CITY DISTRIBUTION DIVISION

BURLINGAME · 848,019 residents

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

View report →
C
66/100

City of San Francisco Water Department

San Francisco · 882,000 residents

Top concern: Lead detected in source water

View report →