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HAT ROCK WATER COMPANY

PWS ID: OR4101309 · HERMISTON, Oregon 97838

HAT ROCK WATER COMPANY serves 108 people in HERMISTON, Oregon using Groundwater water sources. It has 170 recorded EPA violations, including 46 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: HAT ROCK WATER COMPANY

HAT ROCK WATER COMPANY is a private-owned community water system that delivers drinking water to 108 residents in HERMISTON, Oregon (Umatilla County) through 43 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 170 total violations for this system , of which 46 (27%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 114 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 Nitrate, recorded in 27 violations (MCL, health-based). 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. HAT ROCK WATER COMPANY's 170 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
108
Total Violations
170
Health-Based Violations
46
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
43
County
Umatilla
School/Daycare
No
MCL Violations
43
Monitoring Violations
114
Treatment Tech Violations
3

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Nitrate MCL 27 2017
Coliform (TCR) MR 19 2014
Coliform (TCR) MCL 16 2014
Nitrate MR 14 2021
Revised Total Coliform Rule MON 8 2024
Public Notice Other 5 2019
Revised Total Coliform Rule TT 3 2019
E. COLI MR 2 2019
DICHLOROMETHANE MR 2 2020
o-Dichlorobenzene MR 2 2020
p-Dichlorobenzene MR 2 2020
Vinyl chloride MR 2 2020
1,1-Dichloroethylene MR 2 2020
Carbon tetrachloride MR 2 2020
Trichloroethylene MR 2 2020
1,1,2-Trichloroethane MR 2 2020
Tetrachloroethylene MR 2 2020
Toluene MR 2 2020
Ethylbenzene MR 2 2020
Styrene MR 2 2020
cis-1,2-Dichloroethylene MR 2 2020
trans-1,2-Dichloroethylene MR 2 2020
1,2-Dichloroethane MR 2 2020
1,1,1-Trichloroethane MR 2 2020
1,2-Dichloropropane MR 2 2020
CHLOROBENZENE MR 2 2020
Consumer Confidence Rule Other 2 2023
Xylenes, Total MR 2 2020
1,2,4-Trichlorobenzene MR 2 2020
Benzene MR 2 2020

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 HAT ROCK WATER COMPANY.

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 OR4101309 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 Revised Total Coliform Rule MON 8 SDWIS / OR4101309 / 8000
2023 Consumer Confidence Rule Other 2 SDWIS / OR4101309 / 7000
2021 Nitrate MR 14 SDWIS / OR4101309 / 1040
2020 DICHLOROMETHANE MR 2 SDWIS / OR4101309 / 2964
2020 o-Dichlorobenzene MR 2 SDWIS / OR4101309 / 2968
2020 p-Dichlorobenzene MR 2 SDWIS / OR4101309 / 2969
2020 Vinyl chloride MR 2 SDWIS / OR4101309 / 2976
2020 1,1-Dichloroethylene MR 2 SDWIS / OR4101309 / 2977
2020 Carbon tetrachloride MR 2 SDWIS / OR4101309 / 2982
2020 Trichloroethylene MR 2 SDWIS / OR4101309 / 2984
2020 1,1,2-Trichloroethane MR 2 SDWIS / OR4101309 / 2985
2020 Tetrachloroethylene MR 2 SDWIS / OR4101309 / 2987
2020 Toluene MR 2 SDWIS / OR4101309 / 2991
2020 Ethylbenzene MR 2 SDWIS / OR4101309 / 2992
2020 Styrene MR 2 SDWIS / OR4101309 / 2996

How HAT ROCK WATER COMPANY Compares

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

Metric HAT ROCK WATER COMPANY Oregon avg Federal benchmark
Total violations 170 82.1 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 46 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 108 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 HAT ROCK WATER COMPANY water safe to drink? ▼
HAT ROCK WATER COMPANY (PWS ID: OR4101309) has 170 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 108 people using Groundwater sources.
How many people does HAT ROCK WATER COMPANY serve? ▼
HAT ROCK WATER COMPANY serves 108 people in HERMISTON, Oregon. It is a Private-owned system using Groundwater water sources with 43 service connections.
What type of violations does HAT ROCK WATER COMPANY have? ▼
HAT ROCK WATER COMPANY has 170 total violations: 46 health-based violations (MCL exceedances or treatment failures), 114 monitoring/reporting violations, and 3 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in HAT ROCK WATER COMPANY water? ▼
No PFAS testing data is available for HAT ROCK WATER COMPANY under the EPA's UCMR5 monitoring program.
What water source does HAT ROCK WATER COMPANY use? ▼
HAT ROCK WATER COMPANY 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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