Community Water System · PWS MT0000208
Ennis Town Of
Operator location Ennis, Montana - upper-third violation load (> 74 violations) with 175 EPA violations; groundwater source; 1,400 served (PWS-level, not municipal population).
- 1,400
- People served (this PWS)
- 175
- EPA violations (this PWS)
- 3
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Ennis Town Of standing, high SDWIS violation third
175 EPA SDWIS violations on record - upper-third violation load (> 74 violations). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 2% is middle-third health share (≤ 23%). Population rank #16,563 of 29,740 among systems serving 500+.
The verdict
Ennis Town Of sits in the upper third of the sitemap cohort by violation count (175), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 1,400 (mid served population (≤ 3,309)). Health-based share is 2% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #16,563 of 29,740
- Population · /systems
- #105 of 283
- Population · MT
- 175
- Total EPA violations on record
- 2%
- 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
- Local
- Connections
- 757
- County
- Madison
- School/Daycare
- No
- MCL Violations
- 3
- Monitoring Violations
- 168
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 14 | 2008 |
| Lead and Copper Rule | MR | 9 | 2023 |
| BHC-GAMMA | MR | 6 | 2018 |
| Dalapon | MR | 6 | 2018 |
| Toxaphene | MR | 6 | 2018 |
| Di(2-ethylhexyl) adipate | MR | 6 | 2018 |
| OXAMYL | MR | 6 | 2018 |
| Dinoseb | MR | 6 | 2018 |
| Hexachlorocyclopentadiene | MR | 6 | 2018 |
| Carbofuran | MR | 6 | 2018 |
| Atrazine | MR | 6 | 2018 |
| LASSO | MR | 6 | 2018 |
| Heptachlor | MR | 6 | 2018 |
| Heptachlor epoxide | MR | 6 | 2018 |
| 2,4-D | MR | 6 | 2018 |
| 2,4,5-TP | MR | 6 | 2018 |
| Benzo(a)pyrene | MR | 6 | 2018 |
| Chlordane | MR | 6 | 2018 |
| Methoxychlor | MR | 6 | 2018 |
| Picloram | MR | 6 | 2018 |
| Pentachlorophenol | MR | 6 | 2018 |
| Simazine | MR | 6 | 2018 |
| Di(2-ethylhexyl) phthalate | MR | 6 | 2018 |
| Endrin | MR | 6 | 2018 |
| HEXACHLOROBENZENE | MR | 6 | 2018 |
| Coliform (TCR) | MCL | 3 | 1994 |
| Gross Alpha, Excl. Radon and U | MR | 3 | 2018 |
| Combined Radium (-226 and -228) | MR | 3 | 2018 |
| Nitrate | MR | 1 | 1998 |
Violation Count vs. the National Corpus
Ennis Town Of has 175 recorded EPA violations, 83% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 17% carry more. 2% of this system's own violations are health-based (3 of 175), and it ranks #16,563 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)
175 Higher than most more violations than 83% 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
SDWIS compliance record for Ennis Town Of
175 violations on record for MT0000208; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS
Nationwide peers
175 violations · 1,400 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.
Cross-state systems near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Ennis Town Of
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.