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Water system · PWSID CA1910070

LOS ANGELES CWWD 40 REG 4 & 34 LANCASTER

ALHAMBRA, CA · ~208,129 people served

Check your exact address → ALHAMBRA overview
100
Excellent
PurityRadar safety score

PWSID

CA1910070

State

California

City

ALHAMBRA

Population served

208,129

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 Mar 2024). Levels in parts per trillion (ppt).

Lithium

10,300 ppt

limit —

No federal limit

Violations & enforcement

4

Violations on record

0

Unaddressed

1

Health-based

9

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Oct 2007. Official EPA record →

Monitoring & reporting · Arsenic began Sep 2007 Resolved
Monitoring & reporting · Nitrate began Feb 2003 Resolved
Monitoring & reporting · Nitrite began Feb 2003 Resolved
Max contaminant level (MCL) · Total coliform health-based began Dec 1992 Resolved

Recent enforcement actions

  • State action · SIA Oct 2007
  • State action · SOX Oct 2007
  • State action · SIA Apr 2003
  • State action · SOX Apr 2003
  • EPA/federal action · EOX Mar 2000
  • EPA/federal action · EOX Dec 1993
  • State action · SFJ Apr 1993
  • State action · SOX Apr 1993

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 Aug 2023

5.64 · max 13 mg/l as N · 6

Arsenic

2 stations · latest Aug 2023

1.2 · max 1.5 ug/l · 3

Fluoride

2 stations · latest Aug 2023

0.24 · max 0.25 mg/l · 3

Manganese

1 station · latest Aug 2023

1.3 · max 1.75 ug/l · 2

Copper

1 station · latest Jan 2023

2 · max 2 ug/l · 1

Uranium

1 station · latest Jan 2023

4.37 · max 4.37 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 CA1910070 — 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.