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Water system · PWSID CA3610005

LAKE ARROWHEAD CSD

LAKE ARROWHEAD, CA · ~7,038 people served

Check your exact address → LAKE ARROWHEAD overview
53
Fair
PurityRadar safety score

PWSID

CA3610005

State

California

City

LAKE ARROWHEAD

Population served

7,038

Primary source

Surface water

Score history

▼ 47 points — the score moved from 100 to 53 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 53

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).

PFOA

Perfluorooctanoic acid

11 ppt

limit 4 ppt

Above EPA limit · 2.8×

PFOS

Perfluorooctanesulfonic acid

5 ppt

limit 4 ppt

Above EPA limit · 1.3×

PFNA

Perfluorononanoic acid

4.6 ppt

limit 10 ppt

Below EPA limit

PFHxS

Perfluorohexanesulfonic acid

3.3 ppt

limit 10 ppt

Below EPA limit

PFHxA

4.8 ppt

limit —

No federal limit

PFHpA

4.4 ppt

limit —

No federal limit

PFPeA

3.7 ppt

limit —

No federal limit

PFDA

3.4 ppt

limit —

No federal limit

Violations & enforcement

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

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

2 stations · latest Jul 2020

0.091 · max 0.141 mg/l as N · 4

Copper

2 stations · latest Jul 2020

0.89 · max 1.2 ug/l · 2

Fluoride

2 stations · latest Jul 2020

0.14 · max 0.16 mg/l · 2

Lead

2 stations · latest Jul 2020

0.436 · max 0.624 ug/l · 2

Uranium

2 stations · latest Jul 2020

73 · max 95 ug/l · 2

Arsenic

1 station · latest Jul 2020

0.36 · max 0.36 ug/l · 1

Manganese

1 station · latest Jul 2020

0.64 · max 0.64 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 CA3610005 — 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.