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Water system · PWSID CA0610004

CITY OF WILLIAMS

WILLIAMS, CA · ~5,538 people served

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

PWSID

CA0610004

State

California

City

WILLIAMS

Population served

5,538

Primary source

Groundwater

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

Latest detections from EPA’s UCMR5 monitoring (through Aug 2024). Levels in parts per trillion (ppt).

Lithium

28,400 ppt

limit —

No federal limit

Violations & enforcement

3

Violations on record

0

Unaddressed

3

Health-based

5

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Mar 1996. Official EPA record →

Max contaminant level (MCL) · Total coliform health-based began Feb 1996 Resolved
Max contaminant level (MCL) · Total coliform health-based began Oct 1993 Resolved
Max contaminant level (MCL) · Total coliform health-based began Jul 1992 Resolved

Recent enforcement actions

  • State action · SOX Mar 1996
  • State action · SIE Mar 1996
  • State action · SOX Aug 1995
  • State action · SIE Nov 1993
  • State action · SFJ Jul 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 Jul 2021

0.659 · max 0.659 mg/l as N · 2

Arsenic

1 station · latest Jul 2021

2.1 · max 2.1 ug/l · 1

Fluoride

1 station · latest Jul 2021

0.41 · max 0.41 mg/l · 1

Manganese

1 station · latest Jul 2021

90.1 · max 90.1 ug/l · 1

Uranium

1 station · latest Jul 2021

2.6 · max 2.6 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 CA0610004 — 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.