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Water system · PWSID OR4100252

DAYTON, CITY OF

DAYTON, OR · ~2,535 people served

Check your exact address → DAYTON overview
100
Excellent
PurityRadar safety score

PWSID

OR4100252

State

Oregon

City

DAYTON

Population served

2,535

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

No PFAS detections are on record for this system from EPA’s UCMR5 monitoring (2023–25). Absence of a detection isn’t a guarantee — not every system was sampled, and this dataset doesn’t cover other contaminants.

Violations & enforcement

91

Violations on record

2

Unaddressed

5

Health-based

35

Enforcement actions

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

Monitoring & reporting · EPA contaminant 3014 began Aug 2010 Unaddressed
Monitoring & reporting · EPA contaminant 3014 began Aug 2010 Unaddressed
Other · EPA contaminant 7000 began Jul 2024 Resolved
Monitoring & reporting · EPA contaminant 0700 began Dec 2020 Resolved
Treatment technique · EPA contaminant 0700 health-based began Nov 2018 Resolved
Monitoring & reporting · EPA contaminant 0700 began Jul 2015 Resolved
Monitoring & reporting · Total coliform began Sep 2010 Resolved
Monitoring & reporting · Total coliform began Jan 2010 Resolved
Monitoring & reporting · Nitrate began Jan 2009 Resolved
Max contaminant level (MCL) · Total coliform health-based began Sep 2007 Resolved
Monitoring & reporting · Nitrate began Jan 2005 Resolved
Monitoring & reporting · Lead & Copper Rule began Jan 2005 Resolved

Recent enforcement actions

  • State action · SOX Jul 2024
  • State action · SOX Mar 2021
  • State action · SIF Dec 2018
  • State action · SOX Dec 2018
  • State action · SIE Dec 2018
  • State action · SOX Sep 2015
  • State action · SIF Jul 2011
  • State action · SOX Nov 2010

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

Manganese

1 station · latest Nov 2025

17.9 · max 132 ug/L · 15

Arsenic

1 station · latest Nov 2025

0.42 · max 1.33 ug/L · 11

Copper

1 station · latest Nov 2025

1.86 · max 9.23 ug/L · 8

Lead

1 station · latest Feb 2021

1.12 · max 1.57 ug/L · 3

Atrazine

1 station · latest May 2024

14.3 · max 22.8 ng/L · 2

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 OR4100252 — 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.