PlainWater
States → Montana

Non-Transient Non-Community Water System · PWS MT0002805

Tri Hil Wua Gore Hill

Great Falls, Montana 59404 - drinking water served from groundwater sources to 100 people, tracked in EPA SDWIS and UCMR5.

100
People served
870
EPA violations
3
Health-based
Untested
UCMR5 result

The verdict

EPA records 870 drinking-water violations at Tri Hil Wua Gore Hill - above the Montana per-system average.

870
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
100
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Tri Hil Wua Gore Hill

Tri Hil Wua Gore Hill is a private-owned non-transient non-community water system that delivers drinking water to 100 residents in Great Falls, Montana (Cascade County) through 12 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 870 total violations for this system , of which 3 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 864 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 35 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%).

Tri Hil Wua Gore Hill's 870 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
100
Total Violations
870
Health-Based Violations
3
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Private
Connections
12
County
Cascade
School/Daycare
No
MCL Violations
3
Monitoring Violations
864
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 35 2013
cis-1,2-Dichloroethylene MR 20 2017
Xylenes, Total MR 20 2017
p-Dichlorobenzene MR 20 2017
Vinyl chloride MR 20 2017
1,2-Dichloroethane MR 20 2017
Carbon tetrachloride MR 20 2017
1,1,2-Trichloroethane MR 20 2017
Tetrachloroethylene MR 20 2017
CHLOROBENZENE MR 20 2017
Benzene MR 20 2017
Toluene MR 20 2017
Ethylbenzene MR 20 2017
Styrene MR 20 2017
1,2,4-Trichlorobenzene MR 20 2017
DICHLOROMETHANE MR 20 2017
o-Dichlorobenzene MR 20 2017
1,1-Dichloroethylene MR 20 2017
1,1,1-Trichloroethane MR 20 2017
1,2-Dichloropropane MR 20 2017
trans-1,2-Dichloroethylene MR 20 2017
Trichloroethylene MR 20 2017
Fluoride MR 16 2023
Di(2-ethylhexyl) phthalate MR 12 2017
Endrin MR 11 2017
Methoxychlor MR 11 2017
Toxaphene MR 11 2017
Dalapon MR 11 2017
Di(2-ethylhexyl) adipate MR 11 2017
Simazine MR 11 2017

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 Tri Hil Wua Gore Hill.

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 MT0002805 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
2024 Lead and Copper Rule MR 11 SDWIS / MT0002805 / 5000
2023 Fluoride MR 16 SDWIS / MT0002805 / 1025
2023 Total Haloacetic Acids (HAA5) MR 9 SDWIS / MT0002805 / 2456
2023 TTHM MR 9 SDWIS / MT0002805 / 2950
2017 cis-1,2-Dichloroethylene MR 20 SDWIS / MT0002805 / 2380
2017 Xylenes, Total MR 20 SDWIS / MT0002805 / 2955
2017 p-Dichlorobenzene MR 20 SDWIS / MT0002805 / 2969
2017 Vinyl chloride MR 20 SDWIS / MT0002805 / 2976
2017 1,2-Dichloroethane MR 20 SDWIS / MT0002805 / 2980
2017 Carbon tetrachloride MR 20 SDWIS / MT0002805 / 2982
2017 1,1,2-Trichloroethane MR 20 SDWIS / MT0002805 / 2985
2017 Tetrachloroethylene MR 20 SDWIS / MT0002805 / 2987
2017 CHLOROBENZENE MR 20 SDWIS / MT0002805 / 2989
2017 Benzene MR 20 SDWIS / MT0002805 / 2990
2017 Toluene MR 20 SDWIS / MT0002805 / 2991

How Tri Hil Wua Gore Hill Compares

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

Metric Tri Hil Wua Gore Hill Montana avg Federal benchmark
Total violations 870 131.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 3 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 100 492 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 Tri Hil Wua Gore Hill water safe to drink? ▼
Tri Hil Wua Gore Hill (PWS ID: MT0002805) has 870 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 100 people using Groundwater sources.
How many people does Tri Hil Wua Gore Hill serve? ▼
Tri Hil Wua Gore Hill serves 100 people in Great Falls, Montana. It is a Private-owned system using Groundwater water sources with 12 service connections.
What type of violations does Tri Hil Wua Gore Hill have? ▼
Tri Hil Wua Gore Hill has 870 total violations: 3 health-based violations (MCL exceedances or treatment failures), 864 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Tri Hil Wua Gore Hill water? ▼
No PFAS testing data is available for Tri Hil Wua Gore Hill under the EPA's UCMR5 monitoring program.
What water source does Tri Hil Wua Gore Hill use? ▼
Tri Hil Wua Gore Hill 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.