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Water system · PWSID CA4810007

CITY OF VALLEJO

VALLEJO, CA · ~121,420 people served

Check your exact address → VALLEJO overview
100
Excellent
PurityRadar safety score

PWSID

CA4810007

State

California

City

VALLEJO

Population served

121,420

Primary source

Surface water

Score history

No change since tracking began Jun 18, 2026.

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

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

PFAS & contaminant readings

No PFAS detections are on record for this system from EPA’s UCMR5 monitoring (2023–25). Absence of a detection isn’t a guarantee — not every system was sampled, and this dataset doesn’t cover other contaminants.

Violations & enforcement

4

Violations on record

0

Unaddressed

3

Health-based

10

Enforcement actions

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

Treatment technique · EPA contaminant 0200 health-based began Jun 1993 Resolved
Monitoring & reporting · EPA contaminant 0200 began May 1993 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 1991 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 1990 Resolved

Recent enforcement actions

  • State action · SOX Feb 2018
  • State action · SFL Jan 1994
  • State action · SFL Jul 1993
  • State action · SOX Jun 1993
  • State action · SIE Jun 1993
  • State action · SOX May 1993
  • State action · SO8 Apr 1992
  • State action · SFJ Apr 1992

Area water-quality monitoring

Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.

ContaminantMedian · max · samples

Nitrate

1 station · latest May 2022

3.06 · max 3.06 mg/l as N · 2

Arsenic

1 station · latest May 2022

0.18 · max 0.18 ug/l · 1

Copper

1 station · latest May 2022

0.97 · max 0.97 ug/l · 1

Fluoride

1 station · latest May 2022

0.25 · max 0.25 mg/l · 1

Lead

1 station · latest May 2022

0.227 · max 0.227 ug/l · 1

Manganese

1 station · latest May 2022

2.16 · max 2.16 ug/l · 1

Uranium

1 station · latest May 2022

1.12 · max 1.12 ug/l · 1

Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.

This profile is built from EPA public records for system CA4810007 — 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.