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SUN MOUNTAIN RESORT

PWS ID: WA5385135 · Twisp, Washington 98856

SUN MOUNTAIN RESORT serves 376 people in Twisp, Washington using Surface Water water sources. It has 387 recorded EPA violations, including 1 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: SUN MOUNTAIN RESORT

SUN MOUNTAIN RESORT is a private-owned non-transient non-community water system that delivers drinking water to 376 residents in Twisp, Washington (Okanogan County) through 121 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 387 total violations for this system , of which 1 (0%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 386 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is DICHLOROMETHANE, recorded in 18 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. SUN MOUNTAIN RESORT's 387 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
376
Total Violations
387
Health-Based Violations
1
Water Source
Surface Water

System Details

System Type
Non-Transient Non-Community
Owner Type
Private
Connections
121
County
Okanogan
School/Daycare
No
MCL Violations
0
Monitoring Violations
386
Treatment Tech Violations
1

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
DICHLOROMETHANE MR 18 2008
Vinyl chloride MR 18 2008
1,1-Dichloroethylene MR 18 2008
trans-1,2-Dichloroethylene MR 18 2008
1,2-Dichloroethane MR 18 2008
CHLOROBENZENE MR 18 2008
Benzene MR 18 2008
Toluene MR 18 2008
Ethylbenzene MR 18 2008
Styrene MR 18 2008
cis-1,2-Dichloroethylene MR 18 2008
o-Dichlorobenzene MR 18 2008
1,1,1-Trichloroethane MR 18 2008
Carbon tetrachloride MR 18 2008
1,2-Dichloropropane MR 18 2008
Tetrachloroethylene MR 18 2008
p-Dichlorobenzene MR 18 2008
1,1,2-Trichloroethane MR 18 2008
1,2,4-Trichlorobenzene MR 18 2008
Trichloroethylene MR 18 2008
Diquat MR 10 2008
ETHYLENE DIBROMIDE MR 3 2008
1,2-DIBROMO-3-CHLOROPROPANE MR 3 2008
Total Haloacetic Acids (HAA5) MR 2 2024
TTHM MR 2 2024
Dalapon MR 1 2014
Picloram MR 1 2014
Dinoseb MR 1 2014
2,4,5-TP MR 1 2014
Pentachlorophenol MR 1 2014

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 SUN MOUNTAIN RESORT.

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 WA5385135 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 SUN MOUNTAIN RESORT 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
2024 Total Haloacetic Acids (HAA5) MR 2 SDWIS / WA5385135 / 2456
2024 TTHM MR 2 SDWIS / WA5385135 / 2950
2024 Revised Total Coliform Rule MON 1 SDWIS / WA5385135 / 8000
2014 Dalapon MR 1 SDWIS / WA5385135 / 2031
2014 Picloram MR 1 SDWIS / WA5385135 / 2040
2014 Dinoseb MR 1 SDWIS / WA5385135 / 2041
2014 2,4,5-TP MR 1 SDWIS / WA5385135 / 2110
2014 Pentachlorophenol MR 1 SDWIS / WA5385135 / 2326
2008 DICHLOROMETHANE MR 18 SDWIS / WA5385135 / 2964
2008 Vinyl chloride MR 18 SDWIS / WA5385135 / 2976
2008 1,1-Dichloroethylene MR 18 SDWIS / WA5385135 / 2977
2008 trans-1,2-Dichloroethylene MR 18 SDWIS / WA5385135 / 2979
2008 1,2-Dichloroethane MR 18 SDWIS / WA5385135 / 2980
2008 CHLOROBENZENE MR 18 SDWIS / WA5385135 / 2989
2008 Benzene MR 18 SDWIS / WA5385135 / 2990

How SUN MOUNTAIN RESORT Compares

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

Metric SUN MOUNTAIN RESORT Washington avg Federal benchmark
Total violations 387 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 376 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 SUN MOUNTAIN RESORT water safe to drink? ▼
SUN MOUNTAIN RESORT (PWS ID: WA5385135) has 387 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 376 people using Surface Water sources.
How many people does SUN MOUNTAIN RESORT serve? ▼
SUN MOUNTAIN RESORT serves 376 people in Twisp, Washington. It is a Private-owned system using Surface Water water sources with 121 service connections.
What type of violations does SUN MOUNTAIN RESORT have? ▼
SUN MOUNTAIN RESORT has 387 total violations: 1 health-based violations (MCL exceedances or treatment failures), 386 monitoring/reporting violations, and 1 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in SUN MOUNTAIN RESORT water? ▼
No PFAS testing data is available for SUN MOUNTAIN RESORT under the EPA's UCMR5 monitoring program.
What water source does SUN MOUNTAIN RESORT use? ▼
SUN MOUNTAIN RESORT uses Surface Water as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
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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