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Water system · PWSID CA4010017

GOLDEN STATE WATER COMPANY - LOS OSOS

HAWTHORNE, CA · ~5,924 people served

Check your exact address → HAWTHORNE overview
95
Excellent
PurityRadar safety score

PWSID

CA4010017

State

California

City

HAWTHORNE

Population served

5,924

Primary source

Groundwater

Score history

▼ 5 points — the score moved from 100 to 95 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 95

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 Dec 2023). Levels in parts per trillion (ppt).

PFHxS

Perfluorohexanesulfonic acid

8.1 ppt

limit 10 ppt

Near EPA limit

Lithium

9,600 ppt

limit —

No federal limit

PFHxA

4 ppt

limit —

No federal limit

PFPeA

3.3 ppt

limit —

No federal limit

PFBS

3.2 ppt

limit —

No federal limit

Violations & enforcement

No violations are on record for this system in EPA’s SDWIS/ECHO data.

This profile is built from EPA public records for system CA4010017 — 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.