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Water system · PWSID CA1910126

POMONA - CITY, WATER DEPT.

POMONA, CA · ~151,713 people served

Check your exact address → POMONA overview
35
Action needed
PurityRadar safety score

PWSID

CA1910126

State

California

City

POMONA

Population served

151,713

Primary source

Surface water

Score history

▼ 65 points — the score moved from 100 to 35 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 35

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

PFOS

Perfluorooctanesulfonic acid

18 ppt

limit 4 ppt

Above EPA limit · 4.5×

PFOA

Perfluorooctanoic acid

7.1 ppt

limit 4 ppt

Above EPA limit · 1.8×

PFHxS

Perfluorohexanesulfonic acid

7.9 ppt

limit 10 ppt

Near EPA limit

Lithium

9,300 ppt

limit —

No federal limit

PFPeA

4.4 ppt

limit —

No federal limit

PFHxA

4.1 ppt

limit —

No federal limit

PFBS

3.2 ppt

limit —

No federal limit

Violations & enforcement

1

Violations on record

0

Unaddressed

1

Health-based

14

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Mar 2000. Official EPA record →

Treatment technique · EPA contaminant 0200 health-based began Jun 1993 Resolved

Recent enforcement actions

  • EPA/federal action · EOX Mar 2000
  • State action · SFL Oct 1995
  • State action · SOX Oct 1995
  • State action · SIA Apr 1994
  • State action · SOX Apr 1994
  • EPA/federal action · EOX Dec 1993
  • State action · SFL Dec 1993
  • State action · SOX Dec 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

3 stations · latest May 2022

7.8 · max 13 mg/l as N · 6

Arsenic

3 stations · latest May 2022

0.55 · max 1.6 ug/l · 3

Fluoride

3 stations · latest May 2022

0.24 · max 0.28 mg/l · 3

Uranium

3 stations · latest May 2022

2.11 · max 10.5 ug/l · 3

Atrazine

1 station · latest May 2022

25.4 · max 25.4 ng/l · 2

Copper

1 station · latest Aug 2020

1.3 · max 1.3 ug/l · 1

Lead

1 station · latest Aug 2020

0.285 · max 0.285 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 CA1910126 — 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.