Community Water System · PWS MT0003932
Hidden Lake Colony
Operator location Cut Bank, Montana - 26% of 236 violations are health-based (upper-third health share (> 23%)); groundwater source; 80 served per SDWIS.
- 80
- People served (this PWS)
- 236
- EPA violations (this PWS)
- 62
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Hidden Lake Colony standing, high SDWIS violation third
26% of 236 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 26% is upper-third health share (> 23%).
The verdict
Hidden Lake Colony sits in the upper third of the sitemap cohort by violation count (236), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (80; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 26% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- 236
- Total EPA violations on record
- 26%
- Health-based (MCL / treatment failure)
- 80
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 7
- County
- Glacier
- School/Daycare
- No
- MCL Violations
- 62
- Monitoring Violations
- 169
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MCL | 52 | 2017 |
| Groundwater Rule | MR | 24 | 2016 |
| Revised Total Coliform Rule | MON | 22 | 2024 |
| Coliform (TCR) | MR | 17 | 2013 |
| Arsenic | MR | 15 | 2023 |
| Antimony, Total | MR | 9 | 2023 |
| Coliform (TCR) | MCL | 6 | 2006 |
| Consumer Confidence Rule | Other | 5 | 2025 |
| Nitrate-Nitrite | MR | 4 | 2020 |
| Nitrate-Nitrite | MCL | 4 | 2017 |
| Combined Radium (-226 and -228) | MR | 3 | 2019 |
| Endrin | MR | 3 | 2019 |
| Methoxychlor | MR | 3 | 2019 |
| Toxaphene | MR | 3 | 2019 |
| Dalapon | MR | 3 | 2019 |
| OXAMYL | MR | 3 | 2019 |
| Di(2-ethylhexyl) phthalate | MR | 3 | 2019 |
| Picloram | MR | 3 | 2019 |
| Dinoseb | MR | 3 | 2019 |
| Hexachlorocyclopentadiene | MR | 3 | 2019 |
| Atrazine | MR | 3 | 2019 |
| Heptachlor | MR | 3 | 2019 |
| Heptachlor epoxide | MR | 3 | 2019 |
| 2,4-D | MR | 3 | 2019 |
| HEXACHLOROBENZENE | MR | 3 | 2019 |
| Benzo(a)pyrene | MR | 3 | 2019 |
| Pentachlorophenol | MR | 3 | 2019 |
| Chlordane | MR | 3 | 2019 |
| E. COLI | MR | 3 | 2022 |
| BHC-GAMMA | MR | 3 | 2019 |
Violation Count vs. the National Corpus
Hidden Lake Colony has 236 recorded EPA violations, 87% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 12% carry more. 26% of this system's own violations are health-based (62 of 236), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
236 Higher than most more violations than 87% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
Health-based violations on Hidden Lake Colony
62 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for MT0003932.
Sources: EPA SDWIS
Nationwide peers
236 violations · 80 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
What to do with Hidden Lake Colony
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Montana compares on the same EPA violation measures. Montana systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.