MONTARA WATER AND SANITARY DISTRICT

MONTARA, CA · ~6,078 people served

Check your exact address → MONTARA overview

100

Excellent

PurityRadar safety score

PWSID

CA4110010

State

California

City

MONTARA

Population served

6,078

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 Feb 2018. Official EPA record →

Max contaminant level (MCL) · Nitrate health-based began Jun 2010 Resolved

Max contaminant level (MCL) · Cyanide health-based began Dec 1996 Resolved

Monitoring & reporting · Nitrate began Dec 1996 Resolved

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

Recent enforcement actions

State action · SOX Feb 2018
State action · SOX Jul 2010
State action · SFL Jul 2010
EPA/federal action · EOX Mar 2000
State action · SFJ Dec 1997
State action · SOX Dec 1997
State action · SOX Feb 1996
EPA/federal action · EOX Dec 1993

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 Jun 2021

0.198 · max 0.198 mg/l as N · 2

Arsenic

1 station · latest Jun 2021

7.6 · max 7.6 ug/l · 1

Copper

1 station · latest Jun 2021

1.8 · max 1.8 ug/l · 1

Fluoride

1 station · latest Jun 2021

0.59 · max 0.59 mg/l · 1

Lead

1 station · latest Jun 2021

0.224 · max 0.224 ug/l · 1

Uranium

1 station · latest Jun 2021

0.148 · max 0.148 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 CA4110010 — 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.