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Community Water System · PWS OR4100725

McNulty Water PUD

St. Helens, Oregon 97051 - drinking water served from groundwater sources to 2,500 people, tracked in EPA SDWIS and UCMR5.

2,500
People served
155
EPA violations
21
Health-based
Untested
UCMR5 result

The verdict

EPA records 155 drinking-water violations at McNulty Water PUD, 14% of them health-based - above the Oregon per-system average.

155
Total EPA violations on record
14%
Health-based (MCL / treatment failure)
2,500
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: McNulty Water PUD

McNulty Water PUD is a private-owned community water system that delivers drinking water to 2,500 residents in St. Helens, Oregon (Columbia County) through 949 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 155 total violations for this system , of which 21 (14%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 125 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 28 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. Statewide, 30 of 125 UCMR5-tested systems have reported PFAS detections (24%).

McNulty Water PUD's 155 violations sit above the Oregon average.

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
2,500
Total Violations
155
Health-Based Violations
21
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
949
County
Columbia
School/Daycare
No
MCL Violations
21
Monitoring Violations
125
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 28 2012
Coliform (TCR) MCL 14 2009
Arsenic MR 7 2025
Arsenic MCL 7 2020
Nitrate MR 6 2022
1,2,4-Trichlorobenzene MR 3 2020
cis-1,2-Dichloroethylene MR 3 2020
Xylenes, Total MR 3 2020
DICHLOROMETHANE MR 3 2020
o-Dichlorobenzene MR 3 2020
trans-1,2-Dichloroethylene MR 3 2020
1,2-Dichloroethane MR 3 2020
Carbon tetrachloride MR 3 2020
1,2-Dichloropropane MR 3 2020
Trichloroethylene MR 3 2020
Tetrachloroethylene MR 3 2020
Benzene MR 3 2020
Toluene MR 3 2020
Ethylbenzene MR 3 2020
Styrene MR 3 2020
Lead and Copper Rule MR 3 2023
p-Dichlorobenzene MR 3 2020
1,1-Dichloroethylene MR 3 2020
1,1,1-Trichloroethane MR 3 2020
1,1,2-Trichloroethane MR 3 2020
Consumer Confidence Rule Other 3 2024
Vinyl chloride MR 3 2020
CHLOROBENZENE MR 3 2020
Combined Uranium MR 2 2014
Gross Alpha, Excl. Radon and U MR 2 2014

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 McNulty Water PUD.

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 OR4100725 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
2025 Arsenic MR 7 SDWIS / OR4100725 / 1005
2024 Consumer Confidence Rule Other 3 SDWIS / OR4100725 / 7000
2023 Lead and Copper Rule MR 3 SDWIS / OR4100725 / 5000
2022 Nitrate MR 6 SDWIS / OR4100725 / 1040
2021 E. COLI MR 1 SDWIS / OR4100725 / 3014
2020 Arsenic MCL 7 SDWIS / OR4100725 / 1005
2020 1,2,4-Trichlorobenzene MR 3 SDWIS / OR4100725 / 2378
2020 cis-1,2-Dichloroethylene MR 3 SDWIS / OR4100725 / 2380
2020 Xylenes, Total MR 3 SDWIS / OR4100725 / 2955
2020 DICHLOROMETHANE MR 3 SDWIS / OR4100725 / 2964
2020 o-Dichlorobenzene MR 3 SDWIS / OR4100725 / 2968
2020 trans-1,2-Dichloroethylene MR 3 SDWIS / OR4100725 / 2979
2020 1,2-Dichloroethane MR 3 SDWIS / OR4100725 / 2980
2020 Carbon tetrachloride MR 3 SDWIS / OR4100725 / 2982
2020 1,2-Dichloropropane MR 3 SDWIS / OR4100725 / 2983

How McNulty Water PUD Compares

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

Metric McNulty Water PUD Oregon avg Federal benchmark
Total violations 155 82.1 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 21 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 2,500 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 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is McNulty Water PUD water safe to drink? ▼
McNulty Water PUD (PWS ID: OR4100725) has 155 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 2,500 people using Groundwater sources.
How many people does McNulty Water PUD serve? ▼
McNulty Water PUD serves 2,500 people in St. Helens, Oregon. It is a Private-owned system using Groundwater water sources with 949 service connections.
What type of violations does McNulty Water PUD have? ▼
McNulty Water PUD has 155 total violations: 21 health-based violations (MCL exceedances or treatment failures), 125 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in McNulty Water PUD water? ▼
No PFAS testing data is available for McNulty Water PUD under the EPA's UCMR5 monitoring program.
What water source does McNulty Water PUD use? ▼
McNulty Water PUD 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.
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.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.