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States → EPA Region 10 — Tribal Water Systems

Non-Transient Non-Community Water System · PWS 105300134

Mistequa Casino

Wellpinit, EPA Region 10 — Tribal Water Systems 99040 - drinking water served from groundwater sources to 2,070 people, tracked in EPA SDWIS and UCMR5.

2,070
People served
674
EPA violations
7
Health-based
Untested
UCMR5 result

The verdict

EPA records 674 drinking-water violations at Mistequa Casino, 1% of them health-based.

674
Total EPA violations on record
1%
Health-based (MCL / treatment failure)
2,070
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Mistequa Casino

Mistequa Casino is a native american-owned non-transient non-community water system that delivers drinking water to 2,070 residents in Wellpinit, EPA Region 10 — Tribal Water Systems through 6 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 674 total violations for this system , of which 7 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 660 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 Coliform (TCR), recorded in 36 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

EPA Region 10 — Tribal Water Systems has thousands of regulated public water systems tracked by EPA under the Safe Drinking Water Act.

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
2,070
Total Violations
674
Health-Based Violations
7
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Native American
Connections
6
School/Daycare
No
MCL Violations
2
Monitoring Violations
660
Treatment Tech Violations
5

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 36 2015
Styrene MR 12 2012
CHLOROBENZENE MR 12 2012
Benzene MR 12 2012
Diquat MR 12 2009
Endothall MR 12 2009
2,3,7,8-TCDD MR 12 2009
ETHYLENE DIBROMIDE MR 12 2009
1,2,4-Trichlorobenzene MR 12 2012
cis-1,2-Dichloroethylene MR 12 2012
Xylenes, Total MR 12 2012
DICHLOROMETHANE MR 12 2012
o-Dichlorobenzene MR 12 2012
1,1-Dichloroethylene MR 12 2012
trans-1,2-Dichloroethylene MR 12 2012
1,2-Dichloroethane MR 12 2012
Trichloroethylene MR 12 2012
1,1,2-Trichloroethane MR 12 2012
Ethylbenzene MR 12 2012
Glyphosate MR 12 2009
1,2-DIBROMO-3-CHLOROPROPANE MR 12 2009
p-Dichlorobenzene MR 12 2012
Toluene MR 12 2012
Vinyl chloride MR 12 2012
1,1,1-Trichloroethane MR 12 2012
Tetrachloroethylene MR 12 2012
1,2-Dichloropropane MR 12 2012
Carbon tetrachloride MR 12 2012
Di(2-ethylhexyl) adipate MR 11 2009
Endrin MR 11 2009

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 Mistequa Casino.

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 105300134 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

EPA Region 10 — Tribal Water Systems Drinking Water Authority

EPA Region 10 — Tribal Water Systems'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
2024 LEAD AND COPPER RULE REVISIONS RPT 1 SDWIS / 105300134 / 5200
2024 LEAD AND COPPER RULE REVISIONS TT 1 SDWIS / 105300134 / 5200
2024 Public Notice Other 1 SDWIS / 105300134 / 7500
2022 Revised Total Coliform Rule MON 10 SDWIS / 105300134 / 8000
2022 Revised Total Coliform Rule RPT 4 SDWIS / 105300134 / 8000
2019 Nitrate MR 5 SDWIS / 105300134 / 1040
2018 Lead and Copper Rule MR 5 SDWIS / 105300134 / 5000
2018 Groundwater Rule TT 4 SDWIS / 105300134 / 0700
2017 Arsenic MR 3 SDWIS / 105300134 / 1005
2015 Coliform (TCR) MR 36 SDWIS / 105300134 / 3100
2014 Coliform (TCR) MCL 2 SDWIS / 105300134 / 3100
2012 Styrene MR 12 SDWIS / 105300134 / 2996
2012 CHLOROBENZENE MR 12 SDWIS / 105300134 / 2989
2012 Benzene MR 12 SDWIS / 105300134 / 2990
2012 1,2,4-Trichlorobenzene MR 12 SDWIS / 105300134 / 2378

How Mistequa Casino Compares

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

Metric Mistequa Casino EPA Region 10 — Tribal Water Systems avg Federal benchmark
Total violations 674 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 7 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 2,070 - Sizing context for compliance burden

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

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 Mistequa Casino water safe to drink? ▼
Mistequa Casino (PWS ID: 105300134) has 674 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 2,070 people using Groundwater sources.
How many people does Mistequa Casino serve? ▼
Mistequa Casino serves 2,070 people in Wellpinit, EPA Region 10 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 6 service connections.
What type of violations does Mistequa Casino have? ▼
Mistequa Casino has 674 total violations: 7 health-based violations (MCL exceedances or treatment failures), 660 monitoring/reporting violations, and 5 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Mistequa Casino water? ▼
No PFAS testing data is available for Mistequa Casino under the EPA's UCMR5 monitoring program.
What water source does Mistequa Casino use? ▼
Mistequa Casino uses Groundwater 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.
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.