TIERRA BONITA MUTUAL WATER

LANCASTER, CA · ~75 people served

Check your exact address → LANCASTER overview

100

Excellent

PurityRadar safety score

PWSID

CA1900154

State

California

City

LANCASTER

Population served

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 Sep 2020. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Jul 1993 Unaddressed

Monitoring & reporting · Lead & Copper Rule began Oct 2019 Resolved

Monitoring & reporting · Nitrate began Jan 2017 Resolved

Max contaminant level (MCL) · Total coliform health-based began Aug 2011 Resolved

Max contaminant level (MCL) · Total coliform health-based began Jul 2011 Resolved

Recent enforcement actions

State action · SOX Sep 2020
State action · SOX Sep 2020
State action · SFL Dec 2019
State action · SOX Oct 2018
State action · SFL Jul 2018
State action · SFL Nov 2011
State action · SOX Sep 2011
State action · SOX Aug 2011

This profile is built from EPA public records for system CA1900154 — 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.