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DAYTON, CITY OF

PWS ID: OR4100252 · DAYTON, Oregon 97114

DAYTON, CITY OF serves 2,535 people in DAYTON, Oregon using Groundwater water sources. It has 103 recorded EPA violations, including 7 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: DAYTON, CITY OF

DAYTON, CITY OF is a local-owned community water system that delivers drinking water to 2,535 residents in DAYTON, Oregon (Yamhill County) through 904 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 103 total violations for this system , of which 7 (7%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 92 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 10 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Oregon, EPA tracks 2,518 public water systems serving 4,005,242 people, with 206,659 cumulative violations and 20,339 health-based violations on record. About 99% of systems in the state carry at least one violation, and state-wide the average per system is 82.1 violations. DAYTON, CITY OF's 103 violations sit above the Oregon average. Statewide, 30 of 125 UCMR5-tested systems have reported PFAS detections (24%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
2,535
Total Violations
103
Health-Based Violations
7
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
904
County
Yamhill
School/Daycare
No
MCL Violations
4
Monitoring Violations
92
Treatment Tech Violations
3

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 10 2010
Nitrate MR 9 2009
Coliform (TCR) MCL 4 2007
Lead and Copper Rule MR 3 2005
Groundwater Rule TT 3 2018
Gross Alpha, Excl. Radon and U MR 2 1996
E. COLI MR 2 2010
Groundwater Rule MR 2 2020
Arsenic MR 1 2002
Cadmium MR 1 2002
Chromium MR 1 2002
CYANIDE MR 1 2002
Beryllium, Total MR 1 2002
Selenium MR 1 2002
1,2,4-Trichlorobenzene MR 1 2002
Xylenes, Total MR 1 2002
DICHLOROMETHANE MR 1 2002
Vinyl chloride MR 1 2002
trans-1,2-Dichloroethylene MR 1 2002
1,2-Dichloroethane MR 1 2002
1,2-Dichloropropane MR 1 2002
Benzene MR 1 2002
Toluene MR 1 2002
Ethylbenzene MR 1 2002
Styrene MR 1 2002
Endrin MR 1 2002
Methoxychlor MR 1 2002
Toxaphene MR 1 2002
Dalapon MR 1 2002
Diquat MR 1 2002

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records — or to file a complaint, request a Consumer Confidence Report, or check current monitoring status — go directly to the federal and state regulators that enforce the Safe Drinking Water Act for DAYTON, CITY OF.

Federal Source of Truth

EPA SDWIS — Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID OR4100252 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Oregon Drinking Water Authority

Oregon's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find OR regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2024 Consumer Confidence Rule Other 1 SDWIS / OR4100252 / 7000
2020 Groundwater Rule MR 2 SDWIS / OR4100252 / 0700
2018 Groundwater Rule TT 3 SDWIS / OR4100252 / 0700
2010 Coliform (TCR) MR 10 SDWIS / OR4100252 / 3100
2010 E. COLI MR 2 SDWIS / OR4100252 / 3014
2009 Nitrate MR 9 SDWIS / OR4100252 / 1040
2007 Coliform (TCR) MCL 4 SDWIS / OR4100252 / 3100
2005 Lead and Copper Rule MR 3 SDWIS / OR4100252 / 5000
2002 Arsenic MR 1 SDWIS / OR4100252 / 1005
2002 Cadmium MR 1 SDWIS / OR4100252 / 1015
2002 Chromium MR 1 SDWIS / OR4100252 / 1020
2002 CYANIDE MR 1 SDWIS / OR4100252 / 1024
2002 Beryllium, Total MR 1 SDWIS / OR4100252 / 1075
2002 Selenium MR 1 SDWIS / OR4100252 / 1045
2002 1,2,4-Trichlorobenzene MR 1 SDWIS / OR4100252 / 2378

How DAYTON, CITY OF Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric DAYTON, CITY OF Oregon avg Federal benchmark
Total violations 103 82.1 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 7 8.1 Indicates a contaminant exceeded a federal MCL
PFAS detection None 24% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 2,535 1,591 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,518 regulated public water systems in Oregon.

Federal MCL reference — Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is DAYTON, CITY OF water safe to drink? ▼
DAYTON, CITY OF (PWS ID: OR4100252) has 103 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 2,535 people using Groundwater sources.
How many people does DAYTON, CITY OF serve? ▼
DAYTON, CITY OF serves 2,535 people in DAYTON, Oregon. It is a Local-owned system using Groundwater water sources with 904 service connections.
What type of violations does DAYTON, CITY OF have? ▼
DAYTON, CITY OF has 103 total violations: 7 health-based violations (MCL exceedances or treatment failures), 92 monitoring/reporting violations, and 3 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in DAYTON, CITY OF water? ▼
No PFAS testing data is available for DAYTON, CITY OF under the EPA's UCMR5 monitoring program.
What water source does DAYTON, CITY OF use? ▼
DAYTON, CITY OF uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.

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Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by Kiznis Studio Editorial