PlainWater
States → Washington

Community Water System · PWS WA5370350

Lake Quinault

Quinault, Washington 98575 - drinking water served from groundwater sources to 1,003 people, tracked in EPA SDWIS and UCMR5.

1,003
People served
1,331
EPA violations
3
Health-based
Untested
UCMR5 result

The verdict

EPA records 1,331 drinking-water violations at Lake Quinault - above the Washington per-system average.

1,331
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
1,003
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Lake Quinault

Lake Quinault is a private-owned community water system that delivers drinking water to 1,003 residents in Quinault, Washington (Grays Harbor County) through 110 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 1,331 total violations for this system , of which 3 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 1,321 monitoring and reporting violations are on file. The most recent violation on record dates to 2007.

The most frequently cited contaminant at this system is 1,2,4-Trichlorobenzene, recorded in 62 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. Statewide, 98 of 247 UCMR5-tested systems have reported PFAS detections (39.7%).

Lake Quinault's 1,331 violations sit above the Washington 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
1,003
Total Violations
1,331
Health-Based Violations
3
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
110
County
Grays Harbor
School/Daycare
No
MCL Violations
3
Monitoring Violations
1,321
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
1,2,4-Trichlorobenzene MR 62 2007
Vinyl chloride MR 62 2007
1,1-Dichloroethylene MR 62 2007
trans-1,2-Dichloroethylene MR 62 2007
Carbon tetrachloride MR 62 2007
1,2-Dichloropropane MR 62 2007
1,1,2-Trichloroethane MR 62 2007
Tetrachloroethylene MR 62 2007
Benzene MR 62 2007
Toluene MR 62 2007
o-Dichlorobenzene MR 62 2007
p-Dichlorobenzene MR 62 2007
1,1,1-Trichloroethane MR 62 2007
Trichloroethylene MR 62 2007
CHLOROBENZENE MR 62 2007
Styrene MR 62 2007
DICHLOROMETHANE MR 62 2007
1,2-Dichloroethane MR 62 2007
cis-1,2-Dichloroethylene MR 62 2007
Ethylbenzene MR 62 2007
Nitrate MR 28 2007
Lead and Copper Rule MR 12 2007
Coliform (TCR) MR 7 1996
Coliform (TCR) MCL 3 1999
Pentachlorophenol MR 2 2002
Consumer Confidence Rule Other 2 1999
Carbofuran MR 1 2002
Heptachlor epoxide MR 1 2002
Fluoride MR 1 1979
Picloram 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 Lake Quinault.

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 WA5370350 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 Lake Quinault 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
2007 1,2,4-Trichlorobenzene MR 62 SDWIS / WA5370350 / 2378
2007 Vinyl chloride MR 62 SDWIS / WA5370350 / 2976
2007 1,1-Dichloroethylene MR 62 SDWIS / WA5370350 / 2977
2007 trans-1,2-Dichloroethylene MR 62 SDWIS / WA5370350 / 2979
2007 Carbon tetrachloride MR 62 SDWIS / WA5370350 / 2982
2007 1,2-Dichloropropane MR 62 SDWIS / WA5370350 / 2983
2007 1,1,2-Trichloroethane MR 62 SDWIS / WA5370350 / 2985
2007 Tetrachloroethylene MR 62 SDWIS / WA5370350 / 2987
2007 Benzene MR 62 SDWIS / WA5370350 / 2990
2007 Toluene MR 62 SDWIS / WA5370350 / 2991
2007 o-Dichlorobenzene MR 62 SDWIS / WA5370350 / 2968
2007 p-Dichlorobenzene MR 62 SDWIS / WA5370350 / 2969
2007 1,1,1-Trichloroethane MR 62 SDWIS / WA5370350 / 2981
2007 Trichloroethylene MR 62 SDWIS / WA5370350 / 2984
2007 CHLOROBENZENE MR 62 SDWIS / WA5370350 / 2989

How Lake Quinault Compares

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

Metric Lake Quinault Washington avg Federal benchmark
Total violations 1,331 69 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 3 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 1,003 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 (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 Lake Quinault water safe to drink? ▼
Lake Quinault (PWS ID: WA5370350) has 1331 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,003 people using Groundwater sources.
How many people does Lake Quinault serve? ▼
Lake Quinault serves 1,003 people in Quinault, Washington. It is a Private-owned system using Groundwater water sources with 110 service connections.
What type of violations does Lake Quinault have? ▼
Lake Quinault has 1,331 total violations: 3 health-based violations (MCL exceedances or treatment failures), 1,321 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Lake Quinault water? ▼
No PFAS testing data is available for Lake Quinault under the EPA's UCMR5 monitoring program.
What water source does Lake Quinault use? ▼
Lake Quinault 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.