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WATER DISTRICT 19

PWS ID: WA5338900 · Vashon, Washington 98070

WATER DISTRICT 19 serves 3,723 people in Vashon, Washington using Surface Water water sources. It has 572 recorded EPA violations, including 13 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: WATER DISTRICT 19

WATER DISTRICT 19 is a local-owned community water system that delivers drinking water to 3,723 residents in Vashon, Washington (King County) through 1,701 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 572 total violations for this system , of which 13 (2%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 556 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 Pentachlorophenol, recorded in 14 violations (MR). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

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. WATER DISTRICT 19's 572 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
3,723
Total Violations
572
Health-Based Violations
13
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
1,701
County
King
School/Daycare
No
MCL Violations
8
Monitoring Violations
556
Treatment Tech Violations
5

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Pentachlorophenol MR 14 2005
Endrin MR 12 2005
BHC-GAMMA MR 12 2005
Methoxychlor MR 12 2005
Toxaphene MR 12 2005
Simazine MR 12 2005
Di(2-ethylhexyl) phthalate MR 12 2005
Hexachlorocyclopentadiene MR 12 2005
Atrazine MR 12 2005
Heptachlor epoxide MR 12 2005
Benzo(a)pyrene MR 12 2005
Dalapon MR 12 2005
Dinoseb MR 12 2005
Aldicarb sulfoxide MR 12 2005
Carbofuran MR 12 2005
Aldicarb MR 12 2005
ETHYLENE DIBROMIDE MR 12 2005
LASSO MR 12 2005
HEXACHLOROBENZENE MR 12 2005
2,4,5-TP MR 12 2005
Picloram MR 12 2005
Di(2-ethylhexyl) adipate MR 12 2005
Chlordane MR 12 2005
Heptachlor MR 12 2005
Aldicarb sulfone MR 12 2005
OXAMYL MR 12 2005
1,2-DIBROMO-3-CHLOROPROPANE MR 12 2005
1,2,4-Trichlorobenzene MR 11 2006
DICHLOROMETHANE MR 11 2006
o-Dichlorobenzene MR 11 2006

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 360 samples detected PFAS.

Contaminant Date Result MRL Status
NFDHA 7/23/2024 <0.02 µg/L 0.02 µg/L Not Detected
6:2 FTS 7/23/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 7/23/2024 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 7/23/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 7/23/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 7/23/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 7/23/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFEESA 7/23/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 7/23/2024 <0.002 µg/L 0.002 µg/L Not Detected
NMeFOSAA 7/23/2024 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 7/23/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 7/23/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 7/23/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFMBA 7/23/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 7/23/2024 <0.004 µg/L 0.004 µg/L Not Detected
ADONA 7/23/2024 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 7/23/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 7/23/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 7/23/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 7/23/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 7/23/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 7/23/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 7/23/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 7/23/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 7/23/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 7/23/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 7/23/2024 <0.003 µg/L 0.003 µg/L Not Detected
lithium 7/23/2024 <9 µg/L 9 µg/L Not Detected
HFPO-DA 7/23/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHpS 7/23/2024 <0.003 µg/L 0.003 µg/L Not Detected
lithium 7/23/2024 <9 µg/L 9 µg/L Not Detected
6:2 FTS 7/23/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 7/23/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 7/23/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 7/23/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 7/23/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 7/23/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 7/23/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 7/23/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 7/23/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 7/23/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 7/23/2024 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 7/23/2024 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 7/23/2024 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 7/23/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 7/23/2024 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 7/23/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFHpA 7/23/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 7/23/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 7/23/2024 <0.003 µg/L 0.003 µg/L Not Detected

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 WATER DISTRICT 19.

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 WA5338900 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 WATER DISTRICT 19 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 Long Term 2 Enhanced Surface Water Treatment Rule TT 2 SDWIS / WA5338900 / 0800
2020 Total Haloacetic Acids (HAA5) MCL 2 SDWIS / WA5338900 / 2456
2016 Surface Water Treatment Rule MR 2 SDWIS / WA5338900 / 0200
2014 TTHM MR 1 SDWIS / WA5338900 / 2950
2010 Consumer Confidence Rule Other 1 SDWIS / WA5338900 / 7000
2009 Nitrate MR 1 SDWIS / WA5338900 / 1040
2006 1,2,4-Trichlorobenzene MR 11 SDWIS / WA5338900 / 2378
2006 DICHLOROMETHANE MR 11 SDWIS / WA5338900 / 2964
2006 o-Dichlorobenzene MR 11 SDWIS / WA5338900 / 2968
2006 1,1-Dichloroethylene MR 11 SDWIS / WA5338900 / 2977
2006 1,2-Dichloroethane MR 11 SDWIS / WA5338900 / 2980
2006 1,1,1-Trichloroethane MR 11 SDWIS / WA5338900 / 2981
2006 Carbon tetrachloride MR 11 SDWIS / WA5338900 / 2982
2006 Benzene MR 11 SDWIS / WA5338900 / 2990
2006 Toluene MR 11 SDWIS / WA5338900 / 2991

How WATER DISTRICT 19 Compares

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

Metric WATER DISTRICT 19 Washington avg Federal benchmark
Total violations 572 69 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 13 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 3,723 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 WATER DISTRICT 19 water safe to drink? ▼
WATER DISTRICT 19 (PWS ID: WA5338900) has 572 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 3,723 people using Surface Water sources.
How many people does WATER DISTRICT 19 serve? ▼
WATER DISTRICT 19 serves 3,723 people in Vashon, Washington. It is a Local-owned system using Surface Water water sources with 1,701 service connections.
What type of violations does WATER DISTRICT 19 have? ▼
WATER DISTRICT 19 has 572 total violations: 13 health-based violations (MCL exceedances or treatment failures), 556 monitoring/reporting violations, and 5 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in WATER DISTRICT 19 water? ▼
No. WATER DISTRICT 19 was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does WATER DISTRICT 19 use? ▼
WATER DISTRICT 19 uses Surface Water 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. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by Kiznis Studio Editorial