Transient Non-Community Water System · PWS MT0001682
Big Timber KOA
Operator location Big Timber, Montana - smaller served population (≤ 999) at 600 people served; 100 SDWIS violations on record from groundwater sources.
- 600
- People served (this PWS)
- 100
- EPA violations (this PWS)
- 9
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Big Timber KOA standing, high SDWIS violation third
600 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 9% is middle-third health share (≤ 23%). Population rank #26,368 of 29,740 among systems serving 500+.
The verdict
Big Timber KOA sits in the upper third of the sitemap cohort by violation count (100), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (600; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 9% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #26,368 of 29,740
- Population · /systems
- #224 of 283
- Population · MT
- 100
- Total EPA violations on record
- 9%
- 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
- Transient Non-Community
- Owner Type
- Private
- Connections
- 57
- County
- Sweet Grass
- School/Daycare
- No
- MCL Violations
- 1
- Monitoring Violations
- 86
- Treatment Tech Violations
- 8
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 72 | 2008 |
| Revised Total Coliform Rule | TT | 8 | 2025 |
| Revised Total Coliform Rule | MON | 8 | 2025 |
| Nitrate-Nitrite | MR | 6 | 2022 |
| Revised Total Coliform Rule | RPT | 3 | 2020 |
| Coliform (TCR) | MCL | 1 | 1997 |
Violation Count vs. the National Corpus
Big Timber KOA has 100 recorded EPA violations, 73% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 27% carry more. 9% of this system's own violations are health-based (9 of 100), and it ranks #26,368 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)
100 Around the middle fewer violations than 27% 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 Big Timber KOA
EPA SDWIS lists 600 people served and 57 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
100 violations · 600 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 Big Timber KOA
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.