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Community Water System · PWS WA5363277

Maple Grove

Sequim, Washington 98382 - drinking water served from groundwater sources to 132 people, tracked in EPA SDWIS and UCMR5.

132
People served
44
EPA violations
2
Health-based
Untested
UCMR5 result

The verdict

EPA records 44 drinking-water violations at Maple Grove, 5% of them health-based - below the Washington per-system average.

44
Total EPA violations on record
5%
Health-based (MCL / treatment failure)
132
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Maple Grove

Maple Grove is a private-owned community water system that delivers drinking water to 132 residents in Sequim, Washington (Clallam County) through 57 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 44 total violations for this system , of which 2 (5%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 40 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 1,2,4-Trichlorobenzene, recorded in 2 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%).

Maple Grove's 44 violations sit below 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
132
Total Violations
44
Health-Based Violations
2
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
57
County
Clallam
School/Daycare
No
MCL Violations
2
Monitoring Violations
40
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
1,2,4-Trichlorobenzene MR 2 2004
cis-1,2-Dichloroethylene MR 2 2004
DICHLOROMETHANE MR 2 2004
o-Dichlorobenzene MR 2 2004
1,1-Dichloroethylene MR 2 2004
trans-1,2-Dichloroethylene MR 2 2004
1,2-Dichloroethane MR 2 2004
1,1,1-Trichloroethane MR 2 2004
Trichloroethylene MR 2 2004
Tetrachloroethylene MR 2 2004
CHLOROBENZENE MR 2 2004
Benzene MR 2 2004
Toluene MR 2 2004
Ethylbenzene MR 2 2004
p-Dichlorobenzene MR 2 2004
1,1,2-Trichloroethane MR 2 2004
Consumer Confidence Rule Other 2 2025
Coliform (TCR) MCL 2 2003
Vinyl chloride MR 2 2004
Carbon tetrachloride MR 2 2004
1,2-Dichloropropane MR 2 2004
Styrene MR 2 2004

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 Maple Grove.

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 WA5363277 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 Maple Grove 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
2025 Consumer Confidence Rule Other 2 SDWIS / WA5363277 / 7000
2004 1,2,4-Trichlorobenzene MR 2 SDWIS / WA5363277 / 2378
2004 cis-1,2-Dichloroethylene MR 2 SDWIS / WA5363277 / 2380
2004 DICHLOROMETHANE MR 2 SDWIS / WA5363277 / 2964
2004 o-Dichlorobenzene MR 2 SDWIS / WA5363277 / 2968
2004 1,1-Dichloroethylene MR 2 SDWIS / WA5363277 / 2977
2004 trans-1,2-Dichloroethylene MR 2 SDWIS / WA5363277 / 2979
2004 1,2-Dichloroethane MR 2 SDWIS / WA5363277 / 2980
2004 1,1,1-Trichloroethane MR 2 SDWIS / WA5363277 / 2981
2004 Trichloroethylene MR 2 SDWIS / WA5363277 / 2984
2004 Tetrachloroethylene MR 2 SDWIS / WA5363277 / 2987
2004 CHLOROBENZENE MR 2 SDWIS / WA5363277 / 2989
2004 Benzene MR 2 SDWIS / WA5363277 / 2990
2004 Toluene MR 2 SDWIS / WA5363277 / 2991
2004 Ethylbenzene MR 2 SDWIS / WA5363277 / 2992

How Maple Grove Compares

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

Metric Maple Grove Washington avg Federal benchmark
Total violations 44 69 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 2 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 132 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 Maple Grove water safe to drink? ▼
Maple Grove (PWS ID: WA5363277) has 44 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 132 people using Groundwater sources.
How many people does Maple Grove serve? ▼
Maple Grove serves 132 people in Sequim, Washington. It is a Private-owned system using Groundwater water sources with 57 service connections.
What type of violations does Maple Grove have? ▼
Maple Grove has 44 total violations: 2 health-based violations (MCL exceedances or treatment failures), 40 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Maple Grove water? ▼
No PFAS testing data is available for Maple Grove under the EPA's UCMR5 monitoring program.
What water source does Maple Grove use? ▼
Maple Grove 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.