CSA NO. 31 STONEGATE WS

HOLLISTER, CA · ~230 people served

Check your exact address → HOLLISTER overview

100

Excellent

PurityRadar safety score

PWSID

CA3500006

State

California

City

HOLLISTER

Population served

230

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

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Aug 2023. Official EPA record →

Monitoring · Lead & Copper Rule began Jul 2023 Resolved

Monitoring & reporting · Lead & Copper Rule began Oct 2016 Resolved

Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 2009 Resolved

Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2009 Resolved

Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Apr 2009 Resolved

Treatment technique · Bromate health-based began Apr 2006 Resolved

Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Apr 2006 Resolved

Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jan 2006 Resolved

Treatment technique · Bromate health-based began Jan 2006 Resolved

Treatment technique · Bromate health-based began Oct 2005 Resolved

Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 2005 Resolved

Treatment technique · Bromate health-based began Jul 2005 Resolved

Recent enforcement actions

State action · SFL Aug 2023
State action · SOX Aug 2023
State action · SFL Nov 2016
State action · SOX Oct 2016
State action · SOX Sep 2010
State action · SFL Jan 2010
State action · SOX Mar 2008
State action · SFL Aug 2006

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

Manganese

1 station · latest Aug 2022

12.7 · max 12.7 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 CA3500006 — 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.