PlainWater
States → Montana

Community Water System · PWS MT0004529

Horizon Colony

Cut Bank, Montana 59427 - drinking water served from groundwater sources to 150 people, tracked in EPA SDWIS and UCMR5.

150
People served
28
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 28 drinking-water violations at Horizon Colony - below the Montana per-system average.

28
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
150
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Horizon Colony

Horizon Colony is a private-owned community water system that delivers drinking water to 150 residents in Cut Bank, Montana (Glacier County) through 19 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 28 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 2020.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 4 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%).

Horizon Colony's 28 violations sit below 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
150
Total Violations
28
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
19
County
Glacier
School/Daycare
No
MCL Violations
0
Monitoring Violations
25
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 4 2012
Diquat MR 3 2020
Endothall MR 3 2020
Glyphosate MR 3 2020
Total Polychlorinated Biphenyls (PCB) MR 3 2020
1,2-DIBROMO-3-CHLOROPROPANE MR 3 2020
Consumer Confidence Rule Other 3 2013
ETHYLENE DIBROMIDE MR 3 2020
CYANIDE MR 3 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 Horizon Colony.

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 MT0004529 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
2020 Diquat MR 3 SDWIS / MT0004529 / 2032
2020 Endothall MR 3 SDWIS / MT0004529 / 2033
2020 Glyphosate MR 3 SDWIS / MT0004529 / 2034
2020 Total Polychlorinated Biphenyls (PCB) MR 3 SDWIS / MT0004529 / 2383
2020 1,2-DIBROMO-3-CHLOROPROPANE MR 3 SDWIS / MT0004529 / 2931
2020 ETHYLENE DIBROMIDE MR 3 SDWIS / MT0004529 / 2946
2020 CYANIDE MR 3 SDWIS / MT0004529 / 1024
2013 Consumer Confidence Rule Other 3 SDWIS / MT0004529 / 7000
2012 Coliform (TCR) MR 4 SDWIS / MT0004529 / 3100

How Horizon Colony Compares

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

Metric Horizon Colony Montana avg Federal benchmark
Total violations 28 131.4 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 150 492 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 Horizon Colony water safe to drink? ▼
Horizon Colony (PWS ID: MT0004529) has 28 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 150 people using Groundwater sources.
How many people does Horizon Colony serve? ▼
Horizon Colony serves 150 people in Cut Bank, Montana. It is a Private-owned system using Groundwater water sources with 19 service connections.
What type of violations does Horizon Colony have? ▼
Horizon Colony has 28 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 Horizon Colony water? ▼
No PFAS testing data is available for Horizon Colony under the EPA's UCMR5 monitoring program.
What water source does Horizon Colony use? ▼
Horizon Colony 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.