ATASCADERO STATE HOSPITAL

ATASCADERO, CA · ~4,100 people served

Check your exact address → ATASCADERO overview

Excellent

PurityRadar safety score

PWSID

CA4010832

State

California

City

ATASCADERO

Population served

4,100

Primary source

Groundwater

Score history

▼ 10 points — the score moved from 100 to 90 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 90

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

PFOS

Perfluorooctanesulfonic acid

4.3 ppt

limit 4 ppt

Above EPA limit · 1.1×

PFHxS

Perfluorohexanesulfonic acid

4.4 ppt

limit 10 ppt

Below EPA limit

PFPeS

6.1 ppt

limit —

No federal limit

PFBS

3.6 ppt

limit —

No federal limit

PFHxA

3.6 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement May 2024. Official EPA record →

Monitoring & reporting · Nitrate began Jan 2023 Resolved

Monitoring & reporting · Total coliform began Oct 2015 Resolved

Monitoring & reporting · Total coliform began Oct 2002 Resolved

Recent enforcement actions

State action · SFL May 2024
State action · SOX Feb 2024
State action · SFL Dec 2015
State action · SOX Nov 2015
State action · SFJ Dec 2002
State action · SOX Nov 2002

This profile is built from EPA public records for system CA4010832 — 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.