Community Water System · PWS MT0001740
St Ignatius Town Of
Operator location St Ignatius, Montana - smaller served population (≤ 999) at 700 people served; 168 SDWIS violations on record from groundwater sources.
- 700
- People served (this PWS)
- 168
- EPA violations (this PWS)
- 33
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
St Ignatius Town Of standing, high SDWIS violation third
700 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 20% is middle-third health share (≤ 23%). Population rank #24,363 of 29,740 among systems serving 500+.
The verdict
St Ignatius Town Of sits in the upper third of the sitemap cohort by violation count (168), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (700; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 20% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #24,363 of 29,740
- Population · /systems
- #195 of 283
- Population · MT
- 168
- Total EPA violations on record
- 20%
- 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
- 291
- County
- Lake
- School/Daycare
- No
- MCL Violations
- 16
- Monitoring Violations
- 129
- Treatment Tech Violations
- 17
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Groundwater Rule | TT | 17 | 2016 |
| Coliform (TCR) | MCL | 16 | 2010 |
| Coliform (TCR) | MR | 9 | 2011 |
| Lead and Copper Rule | MR | 8 | 2022 |
| Groundwater Rule | MR | 7 | 2025 |
| Consumer Confidence Rule | Other | 6 | 2012 |
| TTHM | MR | 6 | 2019 |
| Total Haloacetic Acids (HAA5) | MR | 6 | 2019 |
| Gross Alpha, Excl. Radon and U | MR | 5 | 2016 |
| Methoxychlor | MR | 3 | 2016 |
| Toxaphene | MR | 3 | 2016 |
| OXAMYL | MR | 3 | 2016 |
| Simazine | MR | 3 | 2016 |
| Di(2-ethylhexyl) phthalate | MR | 3 | 2016 |
| Picloram | MR | 3 | 2016 |
| Dinoseb | MR | 3 | 2016 |
| Aldicarb sulfone | MR | 3 | 2016 |
| Carbofuran | MR | 3 | 2016 |
| Aldicarb | MR | 3 | 2016 |
| LASSO | MR | 3 | 2016 |
| Heptachlor | MR | 3 | 2016 |
| 2,4-D | MR | 3 | 2016 |
| 2,4,5-TP | MR | 3 | 2016 |
| HEXACHLOROBENZENE | MR | 3 | 2016 |
| Pentachlorophenol | MR | 3 | 2016 |
| Chlordane | MR | 3 | 2016 |
| Combined Radium (-226 and -228) | MR | 3 | 2016 |
| E. COLI | MR | 3 | 2024 |
| Heptachlor epoxide | MR | 3 | 2016 |
| Di(2-ethylhexyl) adipate | MR | 3 | 2016 |
Violation Count vs. the National Corpus
St Ignatius Town Of has 168 recorded EPA violations, 83% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 17% carry more. 20% of this system's own violations are health-based (33 of 168), and it ranks #24,363 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)
168 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
Population served record for St Ignatius Town Of
EPA SDWIS lists 700 people served and 291 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
168 violations · 700 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 with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with St Ignatius 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.