COTTONWOOD WATER DISTRICT

COTTONWOOD, CA · ~3,316 people served

Check your exact address → COTTONWOOD overview

100

Excellent

PurityRadar safety score

PWSID

CA4510007

State

California

City

COTTONWOOD

Population served

3,316

Primary source

Groundwater

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 Mar 2026. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Oct 2025 Addressed

Treatment technique · EPA contaminant 5200 health-based began Oct 2024 Resolved

Reporting · EPA contaminant 5200 began Oct 2024 Resolved

Treatment technique · Lead & Copper Rule health-based began Aug 2018 Resolved

Max contaminant level (MCL) · Total coliform health-based began May 2004 Resolved

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

Monitoring & reporting · Total coliform began Sep 1994 Resolved

Recent enforcement actions

EPA/federal action · EOX Mar 2026
EPA/federal action · EFL Jan 2026
State action · SFL Dec 2025
State action · SOX Sep 2018
State action · SOX Jun 2004
State action · SIA Jun 2004
State action · SOX Jan 1996
State action · SIE Jan 1996

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 Dec 2022

0.583 · max 0.583 mg/l as N · 2

Arsenic

1 station · latest Dec 2022

0.78 · max 0.78 ug/l · 1

Fluoride

1 station · latest Dec 2022

0.14 · max 0.14 mg/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 CA4510007 — 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.