Community Water System · PWS MT0000198
Montana State Prison
Operator location Deer Lodge, Montana - 19% of 62 violations are health-based (middle-third health share (≤ 23%)); groundwater source; 2,100 served per SDWIS.
- 2,100
- People served (this PWS)
- 62
- EPA violations (this PWS)
- 12
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Montana State Prison standing, mid SDWIS violation third
19% of 62 recorded violations are health-based - middle-third health share (≤ 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 19% is middle-third health share (≤ 23%). Population rank #13,178 of 29,740 among systems serving 500+.
The verdict
Montana State Prison lands in the middle third by violation volume (62), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is mid-pack at 2,100 (mid served population (≤ 3,309)). Health-based share is 19% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #13,178 of 29,740
- Population · /systems
- #64 of 283
- Population · MT
- 62
- Total EPA violations on record
- 19%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Community
- Owner Type
- State
- Connections
- 53
- County
- Powell
- School/Daycare
- No
- MCL Violations
- 12
- Monitoring Violations
- 45
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 12 | 2015 |
| Coliform (TCR) | MR | 11 | 2011 |
| Lead and Copper Rule | MR | 10 | 2024 |
| Revised Total Coliform Rule | MON | 6 | 2025 |
| Arsenic | MR | 5 | 1999 |
| Asbestos | MR | 5 | 2020 |
| E. COLI | MR | 3 | 2024 |
| Consumer Confidence Rule | Other | 2 | 2025 |
| Nitrate | MR | 1 | 1997 |
| Thallium, Total | MR | 1 | 1996 |
| Nickel | MR | 1 | 1996 |
| Beryllium, Total | MR | 1 | 1996 |
| Antimony, Total | MR | 1 | 1996 |
Violation Count vs. the National Corpus
Montana State Prison has 62 recorded EPA violations, 62% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 37% carry more. 19% of this system's own violations are health-based (12 of 62), and it ranks #13,178 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
62 Around the middle fewer violations than 37% 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 Montana State Prison
12 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for MT0000198.
Sources: EPA SDWIS
Nationwide peers
62 violations · 2,100 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Montana State Prison
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.