SUNNYSLOPE COUNTY WATER DIST

HOLLISTER, CA · ~24,954 people served

Check your exact address → HOLLISTER overview

Excellent

PurityRadar safety score

PWSID

CA3510003

State

California

City

HOLLISTER

Population served

24,954

Primary source

SWP

Score history

▼ 12 points — the score moved from 100 to 88 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 88

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 2025). Levels in parts per trillion (ppt).

PFOA

Perfluorooctanoic acid

4.6 ppt

limit 4 ppt

Above EPA limit · 1.1×

Lithium

21,500 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Mar 2000. Official EPA record →

Max contaminant level (MCL) · Nitrate health-based began Oct 1996 Resolved

Max contaminant level (MCL) · Total coliform health-based began Jan 1996 Resolved

Max contaminant level (MCL) · Total coliform health-based began Jul 1995 Resolved

Max contaminant level (MCL) · Total coliform health-based began Jun 1995 Resolved

Recent enforcement actions

EPA/federal action · EOX Mar 2000
State action · SIA Nov 1997
State action · SOX Nov 1997
State action · SOX Feb 1996
State action · SFM Feb 1996
State action · SIA Aug 1995
State action · SOX Aug 1995
State action · SIA Jul 1995

This profile is built from EPA public records for system CA3510003 — 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.