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Transient Non-Community Water System · PWS WA5305427

Twin Harbor Community Well

Grayland, Washington 98547 - drinking water served from groundwater sources to 21 people, tracked in EPA SDWIS and UCMR5.

21
People served
271
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 271 drinking-water violations at Twin Harbor Community Well - above the Washington per-system average.

271
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
21
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Twin Harbor Community Well

Twin Harbor Community Well is a private-owned transient non-community water system that delivers drinking water to 21 residents in Grayland, Washington (Pacific County) through 19 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 271 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 271 monitoring and reporting violations are on file. The most recent violation on record dates to 2008.

The most frequently cited contaminant at this system is Nitrate, recorded in 13 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%).

Twin Harbor Community Well's 271 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
21
Total Violations
271
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Transient Non-Community
Owner Type
Private
Connections
19
County
Pacific
School/Daycare
No
MCL Violations
0
Monitoring Violations
271
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Nitrate MR 13 2008
trans-1,2-Dichloroethylene MR 9 2006
1,2,4-Trichlorobenzene MR 9 2006
Carbon tetrachloride MR 9 2006
1,1,2-Trichloroethane MR 9 2006
Benzene MR 9 2006
Styrene MR 9 2006
1,2-Dichloroethane MR 9 2006
CHLOROBENZENE MR 9 2006
Toluene MR 9 2006
Vinyl chloride MR 9 2006
DICHLOROMETHANE MR 9 2006
1,2-Dichloropropane MR 9 2006
1,1-Dichloroethylene MR 9 2006
1,1,1-Trichloroethane MR 9 2006
Tetrachloroethylene MR 9 2006
o-Dichlorobenzene MR 9 2006
Ethylbenzene MR 9 2006
cis-1,2-Dichloroethylene MR 9 2006
Trichloroethylene MR 9 2006
p-Dichlorobenzene MR 9 2006
Cadmium MR 4 2005
Chromium MR 4 2005
Fluoride MR 4 2005
Selenium MR 4 2005
Beryllium, Total MR 4 2005
Mercury MR 4 2005
Nickel MR 4 2005
Thallium, Total MR 4 2005
Coliform (TCR) MR 4 2006

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 Twin Harbor Community Well.

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 WA5305427 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 Twin Harbor Community Well 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
2008 Nitrate MR 13 SDWIS / WA5305427 / 1040
2008 Pentachlorophenol MR 2 SDWIS / WA5305427 / 2326
2008 HEXACHLOROBENZENE MR 1 SDWIS / WA5305427 / 2274
2008 Heptachlor epoxide MR 1 SDWIS / WA5305427 / 2067
2008 Atrazine MR 1 SDWIS / WA5305427 / 2050
2008 Methoxychlor MR 1 SDWIS / WA5305427 / 2015
2008 Di(2-ethylhexyl) adipate MR 1 SDWIS / WA5305427 / 2035
2008 Heptachlor MR 1 SDWIS / WA5305427 / 2065
2008 LASSO MR 1 SDWIS / WA5305427 / 2051
2008 BHC-GAMMA MR 1 SDWIS / WA5305427 / 2010
2008 Simazine MR 1 SDWIS / WA5305427 / 2037
2008 Di(2-ethylhexyl) phthalate MR 1 SDWIS / WA5305427 / 2039
2008 Benzo(a)pyrene MR 1 SDWIS / WA5305427 / 2306
2008 Dalapon MR 1 SDWIS / WA5305427 / 2031
2008 Hexachlorocyclopentadiene MR 1 SDWIS / WA5305427 / 2042

How Twin Harbor Community Well Compares

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

Metric Twin Harbor Community Well Washington avg Federal benchmark
Total violations 271 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 21 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 Twin Harbor Community Well water safe to drink? ▼
Twin Harbor Community Well (PWS ID: WA5305427) has 271 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 21 people using Groundwater sources.
How many people does Twin Harbor Community Well serve? ▼
Twin Harbor Community Well serves 21 people in Grayland, Washington. It is a Private-owned system using Groundwater water sources with 19 service connections.
What type of violations does Twin Harbor Community Well have? ▼
Twin Harbor Community Well has 271 total violations: 0 health-based violations (MCL exceedances or treatment failures), 271 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Twin Harbor Community Well water? ▼
No PFAS testing data is available for Twin Harbor Community Well under the EPA's UCMR5 monitoring program.
What water source does Twin Harbor Community Well use? ▼
Twin Harbor Community Well uses Groundwater as its primary water source. It is classified as a Transient Non-Community Water System, serving transient populations.
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.