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Water system · PWSID CA2410001

CITY OF ATWATER

ATWATER, CA · ~29,479 people served

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

PWSID

CA2410001

State

California

City

ATWATER

Population served

29,479

Primary source

Groundwater

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 May 2024). Levels in parts per trillion (ppt).

PFOS

Perfluorooctanesulfonic acid

45 ppt

limit 4 ppt

Above EPA limit · 11.3×

PFOA

Perfluorooctanoic acid

33 ppt

limit 4 ppt

Above EPA limit · 8.3×

PFHxS

Perfluorohexanesulfonic acid

59 ppt

limit 10 ppt

Above EPA limit · 5.9×

6:2 FTS

13 ppt

limit —

No federal limit

PFHpA

12 ppt

limit —

No federal limit

PFPeS

8.2 ppt

limit —

No federal limit

PFBA

8 ppt

limit —

No federal limit

PFBS

7.8 ppt

limit —

No federal limit

PFPeA

4.8 ppt

limit —

No federal limit

PFHxA

3.7 ppt

limit —

No federal limit

Violations & enforcement

7

Violations on record

0

Unaddressed

3

Health-based

19

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Nov 2015. Official EPA record →

Monitoring & reporting · Nitrate began Jan 2014 Resolved
Monitoring & reporting · Nitrate began Jan 2013 Resolved
Monitoring & reporting · Lead & Copper Rule began Jan 2005 Resolved
Max contaminant level (MCL) · Total coliform health-based began Feb 2002 Resolved
Max contaminant level (MCL) · Total coliform health-based began Nov 2000 Resolved
Monitoring & reporting · Lead & Copper Rule began Jan 1996 Resolved
Max contaminant level (MCL) · Total coliform health-based began Sep 1992 Resolved

Recent enforcement actions

  • State action · SOX Nov 2015
  • State action · SOX Oct 2015
  • State action · SIA Feb 2015
  • State action · SOX Jul 2014
  • State action · SIA Jul 2014
  • State action · SOX Jun 2009
  • State action · SIA Jan 2009
  • State action · SOX Dec 2005

This profile is built from EPA public records for system CA2410001 — 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.