Community Water System · PWS MT0000173
Chester Town Of
Operator location Chester, Montana - smaller served population (≤ 999) at 870 people served; 25 SDWIS violations on record from surface water sources.
- 870
- People served (this PWS)
- 25
- EPA violations (this PWS)
- 1
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Chester Town Of standing, mid SDWIS violation third
870 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 4% is middle-third health share (≤ 23%). Population rank #21,535 of 29,740 among systems serving 500+.
The verdict
Chester Town Of lands in the middle third by violation volume (25), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (870; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 4% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #21,535 of 29,740
- Population · /systems
- #154 of 283
- Population · MT
- 25
- Total EPA violations on record
- 4%
- 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
- 495
- County
- Liberty
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 20
- Treatment Tech Violations
- 1
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 4 | 2003 |
| Combined Radium (-226 and -228) | MR | 4 | 2017 |
| Gross Alpha, Excl. Radon and U | MR | 4 | 2017 |
| Consumer Confidence Rule | Other | 3 | 2010 |
| DICHLOROMETHANE | MR | 3 | 2015 |
| Xylenes, Total | MR | 3 | 2015 |
| Lead and Copper Rule | MR | 2 | 2025 |
| Surface Water Treatment Rule | TT | 1 | 1993 |
Violation Count vs. the National Corpus
Chester Town Of has 25 recorded EPA violations, 37% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 62% carry more. 4% of this system's own violations are health-based (1 of 25), and it ranks #21,535 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)
25 Lower than most fewer violations than 62% 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 Chester Town Of
EPA SDWIS lists 870 people served and 495 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
25 violations · 870 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 with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Chester 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.