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Water system · PWSID OR4100372

HERMISTON, CITY OF

HERMISTON, OR · ~20,000 people served

Check your exact address → HERMISTON overview
54
Fair
PurityRadar safety score

PWSID

OR4100372

State

Oregon

City

HERMISTON

Population served

20,000

Primary source

Surface water

Score history

▼ 46 points — the score moved from 100 to 54 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 54

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

PFOS

Perfluorooctanesulfonic acid

12 ppt

limit 4 ppt

Above EPA limit · 3.0×

PFHxS

Perfluorohexanesulfonic acid

12 ppt

limit 10 ppt

Above EPA limit · 1.2×

Lithium

32,000 ppt

limit —

No federal limit

PFBS

4.4 ppt

limit —

No federal limit

PFPeA

4.2 ppt

limit —

No federal limit

PFHxA

3.9 ppt

limit —

No federal limit

Violations & enforcement

128

Violations on record

0

Unaddressed

7

Health-based

129

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Mar 2025. Official EPA record →

Monitoring · Lead & Copper Rule began Feb 2025 Resolved
Monitoring & reporting · Nitrate began Jul 2023 Resolved
Monitoring & reporting · EPA contaminant 3028 began Sep 2022 Resolved
Monitoring & reporting · EPA contaminant 3028 began Sep 2022 Resolved
Monitoring & reporting · EPA contaminant 3028 began Jul 2022 Resolved
Monitoring & reporting · EPA contaminant 3028 began Jul 2022 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jul 2016 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jul 2016 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Apr 2015 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Apr 2015 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Apr 2014 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Apr 2014 Resolved

Recent enforcement actions

  • State action · SOX Mar 2025
  • State action · SOX Dec 2023
  • State action · SOX Oct 2022
  • State action · SOX Aug 2022
  • State action · SOX Jan 2017
  • State action · SOX Sep 2015
  • State action · SOX Sep 2014
  • State action · SOX Oct 2013

This profile is built from EPA public records for system OR4100372 — 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.