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Community Water System · PWS MT0001647

Big Sky Colony Cut Bank

Cut Bank, Montana 59427 - drinking water served from groundwater sources to 107 people, tracked in EPA SDWIS and UCMR5.

107
People served
1,149
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 1,149 drinking-water violations at Big Sky Colony Cut Bank - above the Montana per-system average.

1,149
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
107
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Big Sky Colony Cut Bank

Big Sky Colony Cut Bank is a private-owned community water system that delivers drinking water to 107 residents in Cut Bank, Montana (Glacier County) through 15 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 1,149 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 1,142 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is 1,2,4-Trichlorobenzene, recorded in 24 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 Montana, EPA tracks 2,263 public water systems serving 1,112,267 people, with 297,270 cumulative violations and 25,922 health-based violations on record. About 95% of systems in the state carry at least one violation, and state-wide the average per system is 131.4 violations. Statewide, 28 of 45 UCMR5-tested systems have reported PFAS detections (62.2%).

Big Sky Colony Cut Bank's 1,149 violations sit above the Montana average.

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
107
Total Violations
1,149
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
15
County
Glacier
School/Daycare
No
MCL Violations
0
Monitoring Violations
1,142
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
1,2,4-Trichlorobenzene MR 24 2020
o-Dichlorobenzene MR 24 2020
p-Dichlorobenzene MR 24 2020
Vinyl chloride MR 24 2020
1,1,1-Trichloroethane MR 24 2020
Carbon tetrachloride MR 24 2020
1,2-Dichloropropane MR 24 2020
Trichloroethylene MR 24 2020
Tetrachloroethylene MR 24 2020
Ethylbenzene MR 24 2020
cis-1,2-Dichloroethylene MR 24 2020
trans-1,2-Dichloroethylene MR 24 2020
1,2-Dichloroethane MR 24 2020
1,1,2-Trichloroethane MR 24 2020
Toluene MR 24 2020
BHC-GAMMA MR 24 2020
Methoxychlor MR 24 2020
Toxaphene MR 24 2020
Di(2-ethylhexyl) adipate MR 24 2020
OXAMYL MR 24 2020
Simazine MR 24 2020
Picloram MR 24 2020
Dinoseb MR 24 2020
Atrazine MR 24 2020
Heptachlor MR 24 2020
Heptachlor epoxide MR 24 2020
2,4-D MR 24 2020
HEXACHLOROBENZENE MR 24 2020
Pentachlorophenol MR 24 2020
Chlordane MR 24 2020

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 Big Sky Colony Cut Bank.

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 MT0001647 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Montana Drinking Water Authority

Montana'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 MT 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
2023 Lead and Copper Rule MR 6 SDWIS / MT0001647 / 5000
2020 1,2,4-Trichlorobenzene MR 24 SDWIS / MT0001647 / 2378
2020 o-Dichlorobenzene MR 24 SDWIS / MT0001647 / 2968
2020 p-Dichlorobenzene MR 24 SDWIS / MT0001647 / 2969
2020 Vinyl chloride MR 24 SDWIS / MT0001647 / 2976
2020 1,1,1-Trichloroethane MR 24 SDWIS / MT0001647 / 2981
2020 Carbon tetrachloride MR 24 SDWIS / MT0001647 / 2982
2020 1,2-Dichloropropane MR 24 SDWIS / MT0001647 / 2983
2020 Trichloroethylene MR 24 SDWIS / MT0001647 / 2984
2020 Tetrachloroethylene MR 24 SDWIS / MT0001647 / 2987
2020 Ethylbenzene MR 24 SDWIS / MT0001647 / 2992
2020 cis-1,2-Dichloroethylene MR 24 SDWIS / MT0001647 / 2380
2020 trans-1,2-Dichloroethylene MR 24 SDWIS / MT0001647 / 2979
2020 1,2-Dichloroethane MR 24 SDWIS / MT0001647 / 2980
2020 1,1,2-Trichloroethane MR 24 SDWIS / MT0001647 / 2985

How Big Sky Colony Cut Bank Compares

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

Metric Big Sky Colony Cut Bank Montana avg Federal benchmark
Total violations 1,149 131.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 11.5 Indicates a contaminant exceeded a federal MCL
PFAS detection None 62.2% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 107 492 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,263 regulated public water systems in Montana.

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 Big Sky Colony Cut Bank water safe to drink? ▼
Big Sky Colony Cut Bank (PWS ID: MT0001647) has 1149 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 107 people using Groundwater sources.
How many people does Big Sky Colony Cut Bank serve? ▼
Big Sky Colony Cut Bank serves 107 people in Cut Bank, Montana. It is a Private-owned system using Groundwater water sources with 15 service connections.
What type of violations does Big Sky Colony Cut Bank have? ▼
Big Sky Colony Cut Bank has 1,149 total violations: 0 health-based violations (MCL exceedances or treatment failures), 1,142 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Big Sky Colony Cut Bank water? ▼
No PFAS testing data is available for Big Sky Colony Cut Bank under the EPA's UCMR5 monitoring program.
What water source does Big Sky Colony Cut Bank use? ▼
Big Sky Colony Cut Bank 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.
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.