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Water system · PWSID CA3810700

PRESIDIO OF SAN FRANCISCO

SAN FRANCISCO, CA · ~3,500 people served

Check your exact address → SAN FRANCISCO overview
92
Excellent
PurityRadar safety score

PWSID

CA3810700

State

California

City

SAN FRANCISCO

Population served

3,500

Primary source

Surface water

Score history

▼ 8 points — the score moved from 100 to 92 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 92

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

Latest detections from EPA’s UCMR5 monitoring (through Sep 2025). Levels in parts per trillion (ppt).

PFOA

Perfluorooctanoic acid

4 ppt

limit 4 ppt

Near EPA limit

PFHxS

Perfluorohexanesulfonic acid

4.1 ppt

limit 10 ppt

Below EPA limit

PFPeA

7 ppt

limit —

No federal limit

PFBA

6.2 ppt

limit —

No federal limit

PFHxA

5.9 ppt

limit —

No federal limit

PFBS

4.6 ppt

limit —

No federal limit

PFHpA

3.1 ppt

limit —

No federal limit

Violations & enforcement

5

Violations on record

0

Unaddressed

4

Health-based

13

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jan 2003. Official EPA record →

Max contaminant level (MCL) · Total coliform health-based began Dec 2002 Resolved
Max contaminant level (MCL) · Total coliform health-based began Mar 1994 Resolved
Monitoring & reporting · Total coliform began Aug 1993 Resolved
Treatment technique · EPA contaminant 0200 health-based began Aug 1993 Resolved
Treatment technique · EPA contaminant 0200 health-based began Jun 1993 Resolved

Recent enforcement actions

  • State action · SOX Jan 2003
  • State action · SIA Jan 2003
  • State action · SOX Apr 1997
  • State action · SOX Apr 1997
  • State action · SOX Apr 1997
  • State action · SOX Apr 1994
  • State action · SFJ Mar 1994
  • State action · SFL Feb 1994

This profile is built from EPA public records for system CA3810700 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.