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MT. VISTA - DUNGENESS GOLF COURSE

PWS ID: 105388889 · SEQUIM, 10 98382

MT. VISTA - DUNGENESS GOLF COURSE serves 3,200 people in SEQUIM, 10 using Groundwater water sources. It has 25 recorded EPA violations, including 0 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: MT. VISTA - DUNGENESS GOLF COURSE

MT. VISTA - DUNGENESS GOLF COURSE is a native american-owned community water system that delivers drinking water to 3,200 residents in SEQUIM, 10 through 64 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 25 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 25 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 Lead and Copper Rule, recorded in 2 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 10, EPA tracks 158 public water systems serving 142,574 people, with 31,953 cumulative violations and 1,055 health-based violations on record. About 98% of systems in the state carry at least one violation, and state-wide the average per system is 202.2 violations. MT. VISTA - DUNGENESS GOLF COURSE's 25 violations sit below the 10 average. Statewide, 2 of 10 UCMR5-tested systems have reported PFAS detections (20%). 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
3,200
Total Violations
25
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
64
School/Daycare
No
MCL Violations
0
Monitoring Violations
25
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 2 2025
1,2,4-Trichlorobenzene MR 1 2017
1,2-Dichloroethane MR 1 2017
1,1,1-Trichloroethane MR 1 2017
Carbon tetrachloride MR 1 2017
1,1,2-Trichloroethane MR 1 2017
Tetrachloroethylene MR 1 2017
CHLOROBENZENE MR 1 2017
Benzene MR 1 2017
Toluene MR 1 2017
cis-1,2-Dichloroethylene MR 1 2017
Ethylbenzene MR 1 2017
ETHYLENE DIBROMIDE MR 1 2017
1,2-DIBROMO-3-CHLOROPROPANE MR 1 2017
Xylenes, Total MR 1 2017
Vinyl chloride MR 1 2017
1,1-Dichloroethylene MR 1 2017
Styrene MR 1 2017
p-Dichlorobenzene MR 1 2017
o-Dichlorobenzene MR 1 2017
trans-1,2-Dichloroethylene MR 1 2017
DICHLOROMETHANE MR 1 2017
1,2-Dichloropropane MR 1 2017
Trichloroethylene MR 1 2017

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 120 samples detected PFAS.

Contaminant Date Result MRL Status
PFTrDA 6/12/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 6/12/2024 <0.008 µg/L 0.008 µg/L Not Detected
NEtFOSAA 6/12/2024 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 6/12/2024 <0.006 µg/L 0.006 µg/L Not Detected
NMeFOSAA 4/9/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFHpA 4/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 4/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 4/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 4/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 4/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 4/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 4/9/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFPeA 4/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 4/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 4/9/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 4/9/2024 <0.008 µg/L 0.008 µg/L Not Detected
11Cl-PF3OUdS 4/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
lithium 4/9/2024 <9 µg/L 9 µg/L Not Detected
ADONA 4/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 4/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 4/9/2024 <0.002 µg/L 0.002 µg/L Not Detected
8:2 FTS 4/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHxA 4/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 4/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 4/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
4:2 FTS 4/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 4/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 4/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFOS 4/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 4/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 4/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 4/9/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFOA 4/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
HFPO-DA 4/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
lithium 4/9/2024 <9 µg/L 9 µg/L Not Detected
8:2 FTS 12/11/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 12/11/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 12/11/2024 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 12/11/2024 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 12/11/2024 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 12/11/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 12/11/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFBA 12/11/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFPeA 12/11/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 12/11/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 12/11/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 12/11/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFPeS 12/11/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 12/11/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 12/11/2024 <0.004 µg/L 0.004 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 MT. VISTA - DUNGENESS GOLF COURSE.

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 105388889 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

10 Drinking Water Authority

10's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find 10 regulator via EPA SDWIS

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 Lead and Copper Rule MR 2 SDWIS / 105388889 / 5000
2017 1,2,4-Trichlorobenzene MR 1 SDWIS / 105388889 / 2378
2017 1,2-Dichloroethane MR 1 SDWIS / 105388889 / 2980
2017 1,1,1-Trichloroethane MR 1 SDWIS / 105388889 / 2981
2017 Carbon tetrachloride MR 1 SDWIS / 105388889 / 2982
2017 1,1,2-Trichloroethane MR 1 SDWIS / 105388889 / 2985
2017 Tetrachloroethylene MR 1 SDWIS / 105388889 / 2987
2017 CHLOROBENZENE MR 1 SDWIS / 105388889 / 2989
2017 Benzene MR 1 SDWIS / 105388889 / 2990
2017 Toluene MR 1 SDWIS / 105388889 / 2991
2017 cis-1,2-Dichloroethylene MR 1 SDWIS / 105388889 / 2380
2017 Ethylbenzene MR 1 SDWIS / 105388889 / 2992
2017 ETHYLENE DIBROMIDE MR 1 SDWIS / 105388889 / 2946
2017 1,2-DIBROMO-3-CHLOROPROPANE MR 1 SDWIS / 105388889 / 2931
2017 Xylenes, Total MR 1 SDWIS / 105388889 / 2955

How MT. VISTA - DUNGENESS GOLF COURSE Compares

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

Metric MT. VISTA - DUNGENESS GOLF COURSE 10 avg Federal benchmark
Total violations 25 202.2 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 0 6.7 Indicates a contaminant exceeded a federal MCL
PFAS detection None 20% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 3,200 902 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 158 regulated public water systems in 10.

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 MT. VISTA - DUNGENESS GOLF COURSE water safe to drink? ▼
MT. VISTA - DUNGENESS GOLF COURSE (PWS ID: 105388889) has 25 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 3,200 people using Groundwater sources.
How many people does MT. VISTA - DUNGENESS GOLF COURSE serve? ▼
MT. VISTA - DUNGENESS GOLF COURSE serves 3,200 people in SEQUIM, 10. It is a Native American-owned system using Groundwater water sources with 64 service connections.
What type of violations does MT. VISTA - DUNGENESS GOLF COURSE have? ▼
MT. VISTA - DUNGENESS GOLF COURSE has 25 total violations: 0 health-based violations (MCL exceedances or treatment failures), 25 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in MT. VISTA - DUNGENESS GOLF COURSE water? ▼
No. MT. VISTA - DUNGENESS GOLF COURSE was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does MT. VISTA - DUNGENESS GOLF COURSE use? ▼
MT. VISTA - DUNGENESS GOLF COURSE 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. 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 PlainWater Editorial