SIGNAL HILL - CITY, WATER DEPT.

SIGNAL HILL, CA · ~11,848 people served

Check your exact address → SIGNAL HILL overview

100

Excellent

PurityRadar safety score

PWSID

CA1910149

State

California

City

SIGNAL HILL

Population served

11,848

Primary source

SWP

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

Latest detections from EPA’s UCMR5 monitoring (through Jul 2024). Levels in parts per trillion (ppt).

Lithium

42,000 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jun 2025. Official EPA record →

Treatment technique · EPA contaminant 0200 health-based began Apr 2025 Resolved

Treatment technique · EPA contaminant 0200 health-based began Mar 2025 Resolved

Treatment technique · EPA contaminant 0200 health-based began Feb 2025 Resolved

Monitoring & reporting · Lead & Copper Rule began Oct 2023 Resolved

Other · EPA contaminant 7000 began Jul 2023 Resolved

Treatment technique · EPA contaminant 0200 health-based began May 2022 Resolved

Treatment technique · EPA contaminant 0200 health-based began Mar 2022 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Apr 2013 Resolved

Monitoring & reporting · Total trihalomethanes (TTHM) began Apr 2013 Resolved

Max contaminant level (MCL) · Total coliform health-based began Jun 1993 Resolved

Monitoring & reporting · Total coliform began Jun 1993 Resolved

Recent enforcement actions

State action · SFL Jun 2025
State action · SOX May 2025
State action · SOX Sep 2024
State action · SOX Jun 2024
State action · SFL Dec 2023
State action · SFL Nov 2023
State action · SFL Jul 2023
State action · SOX Jul 2023

This profile is built from EPA public records for system CA1910149 — 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.