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Water system · PWSID CA0410008

THERMALITO WATER & SEWER DIST

OROVILLE, CA · ~12,136 people served

Check your exact address → OROVILLE overview
88
Excellent
PurityRadar safety score

PWSID

CA0410008

State

California

City

OROVILLE

Population served

12,136

Primary source

Surface water

Score history

▼ 12 points — the score moved from 100 to 88 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 88

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

PFOS

Perfluorooctanesulfonic acid

4.6 ppt

limit 4 ppt

Above EPA limit · 1.1×

Lithium

35,000 ppt

limit —

No federal limit

Violations & enforcement

6

Violations on record

0

Unaddressed

2

Health-based

10

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Dec 2022. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Oct 2022 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Apr 2020 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Apr 2006 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Apr 2006 Resolved
Max contaminant level (MCL) · Total coliform health-based began May 2005 Resolved
Monitoring & reporting · Lead & Copper Rule began Jun 1993 Resolved

Recent enforcement actions

  • State action · SOX Dec 2022
  • State action · SOX Nov 2020
  • State action · SFL Mar 2020
  • State action · SOX Feb 2018
  • State action · SOX Feb 2018
  • State action · SIA Aug 2006
  • State action · SIA Aug 2006
  • State action · SOX Jun 2005

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

1 station · latest Aug 2021

2.57 · max 2.57 mg/l as N · 2

Arsenic

1 station · latest Aug 2021

1.9 · max 1.9 ug/l · 1

Copper

1 station · latest Aug 2021

0.48 · max 0.48 ug/l · 1

Fluoride

1 station · latest Aug 2021

0.15 · max 0.15 mg/l · 1

Lead

1 station · latest Aug 2021

0.119 · max 0.119 ug/l · 1

Uranium

1 station · latest Aug 2021

0.163 · max 0.163 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 CA0410008 — 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.