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DOCKTON WATER ASSOCIATION

PWS ID: WA5319550 · VASHON, Washington 98070

DOCKTON WATER ASSOCIATION serves 992 people in VASHON, Washington using Groundwater water sources. It has 70 recorded EPA violations, including 1 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: DOCKTON WATER ASSOCIATION

DOCKTON WATER ASSOCIATION is a private-owned community water system that delivers drinking water to 992 residents in VASHON, Washington (King County) through 415 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 70 total violations for this system , of which 1 (1%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 58 monitoring and reporting violations are on file. The most recent violation on record dates to 2016.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 23 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. DOCKTON WATER ASSOCIATION's 70 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
992
Total Violations
70
Health-Based Violations
1
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
415
County
King
School/Daycare
No
MCL Violations
1
Monitoring Violations
58
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 23 2006
Lead and Copper Rule MR 11 2007
Consumer Confidence Rule Other 3 2016
TTHM MR 2 2015
Total Haloacetic Acids (HAA5) MR 2 2015
1,2,4-Trichlorobenzene MR 1 2011
cis-1,2-Dichloroethylene MR 1 2011
o-Dichlorobenzene MR 1 2011
p-Dichlorobenzene MR 1 2011
1,2-Dichloroethane MR 1 2011
Carbon tetrachloride MR 1 2011
1,1,2-Trichloroethane MR 1 2011
CHLOROBENZENE MR 1 2011
Benzene MR 1 2011
Toluene MR 1 2011
Styrene MR 1 2011
DICHLOROMETHANE MR 1 2011
Coliform (TCR) MCL 1 2003
Vinyl chloride MR 1 2011
Ethylbenzene MR 1 2011
trans-1,2-Dichloroethylene MR 1 2011
1,1-Dichloroethylene MR 1 2011
Trichloroethylene MR 1 2011
1,1,1-Trichloroethane MR 1 2011
Tetrachloroethylene MR 1 2011
1,2-Dichloropropane MR 1 2011

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 DOCKTON WATER ASSOCIATION.

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 WA5319550 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 DOCKTON WATER ASSOCIATION 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
2016 Consumer Confidence Rule Other 3 SDWIS / WA5319550 / 7000
2015 TTHM MR 2 SDWIS / WA5319550 / 2950
2015 Total Haloacetic Acids (HAA5) MR 2 SDWIS / WA5319550 / 2456
2011 1,2,4-Trichlorobenzene MR 1 SDWIS / WA5319550 / 2378
2011 cis-1,2-Dichloroethylene MR 1 SDWIS / WA5319550 / 2380
2011 o-Dichlorobenzene MR 1 SDWIS / WA5319550 / 2968
2011 p-Dichlorobenzene MR 1 SDWIS / WA5319550 / 2969
2011 1,2-Dichloroethane MR 1 SDWIS / WA5319550 / 2980
2011 Carbon tetrachloride MR 1 SDWIS / WA5319550 / 2982
2011 1,1,2-Trichloroethane MR 1 SDWIS / WA5319550 / 2985
2011 CHLOROBENZENE MR 1 SDWIS / WA5319550 / 2989
2011 Benzene MR 1 SDWIS / WA5319550 / 2990
2011 Toluene MR 1 SDWIS / WA5319550 / 2991
2011 Styrene MR 1 SDWIS / WA5319550 / 2996
2011 DICHLOROMETHANE MR 1 SDWIS / WA5319550 / 2964

How DOCKTON WATER ASSOCIATION Compares

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

Metric DOCKTON WATER ASSOCIATION Washington avg Federal benchmark
Total violations 70 69 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 1 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 992 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 DOCKTON WATER ASSOCIATION water safe to drink? ▼
DOCKTON WATER ASSOCIATION (PWS ID: WA5319550) has 70 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 992 people using Groundwater sources.
How many people does DOCKTON WATER ASSOCIATION serve? ▼
DOCKTON WATER ASSOCIATION serves 992 people in VASHON, Washington. It is a Private-owned system using Groundwater water sources with 415 service connections.
What type of violations does DOCKTON WATER ASSOCIATION have? ▼
DOCKTON WATER ASSOCIATION has 70 total violations: 1 health-based violations (MCL exceedances or treatment failures), 58 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in DOCKTON WATER ASSOCIATION water? ▼
No PFAS testing data is available for DOCKTON WATER ASSOCIATION under the EPA's UCMR5 monitoring program.
What water source does DOCKTON WATER ASSOCIATION use? ▼
DOCKTON WATER ASSOCIATION 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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