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Water system · PWSID WA5318500

DEER PARK CITY OF

Deer Park, WA · ~5,255 people served

Check your exact address → Deer Park overview
70
Good
PurityRadar safety score

PWSID

WA5318500

State

Washington

City

Deer Park

Population served

5,255

Primary source

Groundwater

Score history

▼ 30 points — the score moved from 100 to 70 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 70

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

PFOS

Perfluorooctanesulfonic acid

7.5 ppt

limit 4 ppt

Above EPA limit · 1.9×

PFNA

Perfluorononanoic acid

4.3 ppt

limit 10 ppt

Below EPA limit

PFBS

3.1 ppt

limit —

No federal limit

Violations & enforcement

27

Violations on record

0

Unaddressed

0

Health-based

14

Enforcement actions

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

Monitoring & reporting · Nitrate began Jan 2024 Resolved
Monitoring & reporting · EPA contaminant 2065 began Jul 2018 Resolved
Monitoring & reporting · EPA contaminant 2010 began Jul 2018 Resolved
Monitoring & reporting · EPA contaminant 2042 began Jul 2018 Resolved
Monitoring & reporting · EPA contaminant 2051 began Jul 2018 Resolved
Monitoring & reporting · EPA contaminant 2005 began Jul 2018 Resolved
Monitoring & reporting · EPA contaminant 2039 began Jul 2018 Resolved
Monitoring & reporting · EPA contaminant 2015 began Jul 2018 Resolved
Monitoring & reporting · EPA contaminant 2020 began Jul 2018 Resolved
Monitoring & reporting · EPA contaminant 2035 began Jul 2018 Resolved
Monitoring & reporting · EPA contaminant 2037 began Jul 2018 Resolved
Monitoring & reporting · EPA contaminant 2050 began Jul 2018 Resolved

Recent enforcement actions

  • State action · SOX Mar 2025
  • State action · SOX Dec 2018
  • State action · SOX Dec 2018
  • State action · SOX Oct 2013
  • State action · SOX Jun 2007
  • State action · SOX Jun 2007
  • State action · SOX Jun 2007
  • State action · SOX Jan 2007

This profile is built from EPA public records for system WA5318500 — 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.