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COXVILLE WATER ASSN #1

PWS ID: WA5302777 · Benton City, Washington 99320

COXVILLE WATER ASSN #1 serves 26 people in Benton City, Washington using Groundwater water sources. It has 1,620 recorded EPA violations, including 0 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: COXVILLE WATER ASSN #1

COXVILLE WATER ASSN #1 is a private-owned community water system that delivers drinking water to 26 residents in Benton City, Washington (Benton County) through 13 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 1,620 total violations for this system , of which 0 (0%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 1,620 monitoring and reporting violations are on file. The most recent violation on record dates to 2009.

The most frequently cited contaminant at this system is OXAMYL, recorded in 86 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 Washington, EPA tracks 4,557 public water systems serving 9,736,844 people, with 314,648 cumulative violations and 20,590 health-based violations on record. About 92% of systems in the state carry at least one violation, and state-wide the average per system is 69 violations. COXVILLE WATER ASSN #1's 1,620 violations sit above the Washington average. Statewide, 98 of 247 UCMR5-tested systems have reported PFAS detections (39.7%). 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
26
Total Violations
1,620
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
13
County
Benton
School/Daycare
No
MCL Violations
0
Monitoring Violations
1,620
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
OXAMYL MR 86 2008
Aldicarb sulfoxide MR 86 2008
Aldicarb sulfone MR 86 2008
Carbofuran MR 86 2008
Aldicarb MR 86 2008
Pentachlorophenol MR 52 2009
trans-1,2-Dichloroethylene MR 26 2009
cis-1,2-Dichloroethylene MR 26 2009
Trichloroethylene MR 26 2009
Carbon tetrachloride MR 26 2009
Chlordane MR 26 2009
Hexachlorocyclopentadiene MR 26 2009
Simazine MR 26 2009
HEXACHLOROBENZENE MR 26 2009
Toxaphene MR 26 2009
Styrene MR 26 2009
1,2,4-Trichlorobenzene MR 26 2009
Benzo(a)pyrene MR 26 2009
Dinoseb MR 26 2009
1,1,1-Trichloroethane MR 26 2009
Ethylbenzene MR 26 2009
1,2-Dichloroethane MR 26 2009
1,2-Dichloropropane MR 26 2009
DICHLOROMETHANE MR 26 2009
Methoxychlor MR 26 2009
LASSO MR 26 2009
1,1,2-Trichloroethane MR 26 2009
p-Dichlorobenzene MR 26 2009
o-Dichlorobenzene MR 26 2009
Picloram MR 26 2009

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 COXVILLE WATER ASSN #1.

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 WA5302777 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Washington Drinking Water Authority

Washington State Department of Health — Office of Drinking Water is the primacy agency that licenses and inspects COXVILLE WATER ASSN #1 under EPA-delegated authority.

Open WA regulator portal

Source: Washington State Department of Health — Office of Drinking Water

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
2009 Pentachlorophenol MR 52 SDWIS / WA5302777 / 2326
2009 trans-1,2-Dichloroethylene MR 26 SDWIS / WA5302777 / 2979
2009 cis-1,2-Dichloroethylene MR 26 SDWIS / WA5302777 / 2380
2009 Trichloroethylene MR 26 SDWIS / WA5302777 / 2984
2009 Carbon tetrachloride MR 26 SDWIS / WA5302777 / 2982
2009 Chlordane MR 26 SDWIS / WA5302777 / 2959
2009 Hexachlorocyclopentadiene MR 26 SDWIS / WA5302777 / 2042
2009 Simazine MR 26 SDWIS / WA5302777 / 2037
2009 HEXACHLOROBENZENE MR 26 SDWIS / WA5302777 / 2274
2009 Toxaphene MR 26 SDWIS / WA5302777 / 2020
2009 Styrene MR 26 SDWIS / WA5302777 / 2996
2009 1,2,4-Trichlorobenzene MR 26 SDWIS / WA5302777 / 2378
2009 Benzo(a)pyrene MR 26 SDWIS / WA5302777 / 2306
2009 Dinoseb MR 26 SDWIS / WA5302777 / 2041
2009 1,1,1-Trichloroethane MR 26 SDWIS / WA5302777 / 2981

How COXVILLE WATER ASSN #1 Compares

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

Metric COXVILLE WATER ASSN #1 Washington avg Federal benchmark
Total violations 1,620 69 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 0 4.5 Indicates a contaminant exceeded a federal MCL
PFAS detection None 39.7% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 26 2,137 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 4,557 regulated public water systems in Washington.

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 COXVILLE WATER ASSN #1 water safe to drink? ▼
COXVILLE WATER ASSN #1 (PWS ID: WA5302777) has 1620 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 26 people using Groundwater sources.
How many people does COXVILLE WATER ASSN #1 serve? ▼
COXVILLE WATER ASSN #1 serves 26 people in Benton City, Washington. It is a Private-owned system using Groundwater water sources with 13 service connections.
What type of violations does COXVILLE WATER ASSN #1 have? ▼
COXVILLE WATER ASSN #1 has 1,620 total violations: 0 health-based violations (MCL exceedances or treatment failures), 1,620 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in COXVILLE WATER ASSN #1 water? ▼
No PFAS testing data is available for COXVILLE WATER ASSN #1 under the EPA's UCMR5 monitoring program.
What water source does COXVILLE WATER ASSN #1 use? ▼
COXVILLE WATER ASSN #1 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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