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Water system · PWSID CA4110005

GUADALUPE VALLEY MID

BRISBANE, CA · ~1,472 people served

Check your exact address → BRISBANE overview
34
Action needed
PurityRadar safety score

PWSID

CA4110005

State

California

City

BRISBANE

Population served

1,472

Primary source

SWP

Score history

▼ 66 points — the score moved from 100 to 34 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 34

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 Dec 2023). Levels in parts per trillion (ppt).

PFOA

Perfluorooctanoic acid

9.6 ppt

limit 4 ppt

Above EPA limit · 2.4×

PFOS

Perfluorooctanesulfonic acid

8.3 ppt

limit 4 ppt

Above EPA limit · 2.1×

PFHxS

Perfluorohexanesulfonic acid

3.4 ppt

limit 10 ppt

Below EPA limit

PFHpA

4.3 ppt

limit —

No federal limit

PFHxA

4.2 ppt

limit —

No federal limit

PFPeA

4.1 ppt

limit —

No federal limit

Violations & enforcement

5

Violations on record

0

Unaddressed

1

Health-based

8

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Feb 2018. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Aug 2004 Resolved
Monitoring & reporting · Total coliform began Sep 1999 Resolved
Other · Total coliform began Sep 1999 Resolved
Monitoring & reporting · Lead & Copper Rule began Jul 1993 Resolved
Treatment technique · EPA contaminant 0200 health-based began Jun 1993 Resolved

Recent enforcement actions

  • State action · SOX Feb 2018
  • State action · SOX Dec 2004
  • EPA/federal action · EOX Dec 2003
  • State action · SFL Feb 2000
  • State action · SOX Oct 1999
  • State action · SIA Oct 1999
  • State action · SFL Jun 1993
  • State action · SOX Mar 1992

This profile is built from EPA public records for system CA4110005 — 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.