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Water system · PWSID CA4310006

CITY OF MORGAN HILL

MORGANN HILL, CA · ~47,374 people served

Check your exact address → MORGANN HILL overview
100
Excellent
PurityRadar safety score

PWSID

CA4310006

State

California

City

MORGANN HILL

Population served

47,374

Primary source

Groundwater

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

PFHxS

Perfluorohexanesulfonic acid

3 ppt

limit 10 ppt

Below EPA limit

Lithium

10,900 ppt

limit —

No federal limit

PFHxA

3.4 ppt

limit —

No federal limit

PFPeA

3.1 ppt

limit —

No federal limit

Violations & enforcement

2

Violations on record

0

Unaddressed

1

Health-based

9

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Oct 2024. Official EPA record →

Monitoring & reporting · Total coliform began Nov 1999 Resolved
Max contaminant level (MCL) · Nitrate health-based began Aug 1993 Resolved

Recent enforcement actions

  • State action · SFJ Oct 2024
  • State action · SOX Oct 2024
  • State action · SOX Dec 1999
  • State action · SIB Dec 1999
  • EPA/federal action · EOX Mar 1994
  • State action · SIE Dec 1993
  • State action · SIF Dec 1993
  • State action · SFJ 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

2 stations · latest Oct 2022

4.67 · max 6.38 mg/l as N · 4

Fluoride

2 stations · latest Oct 2022

0.14 · max 0.18 mg/l · 2

Uranium

2 stations · latest Oct 2022

0.0815 · max 0.119 ug/l · 2

Arsenic

1 station · latest Apr 2022

1.5 · max 1.5 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 CA4310006 — 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.