Transient Non-Community Water System · PWS MT0003448
Rock Creek Marina LLC
Operator location Fort Peck, Montana - smaller served population (≤ 999) at 50 people served; 69 SDWIS violations on record from surface water sources.
- 50
- People served (this PWS) Smaller third of systems
- 69
- EPA violations (this PWS) Middle third of systems
- 9
- Health-based (this PWS) Middle third by health-based share
- Untested
- UCMR5 (this PWS) No UCMR5 result
Rock Creek Marina LLC standing, mid SDWIS violation third
50 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 13% is middle-third health share (≤ 23%).
The verdict
Rock Creek Marina LLC lands in the middle third by violation volume (69), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (50; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 13% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 69
- Total EPA violations on record
- 13%
- Health-based (MCL / treatment failure)
- 50
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
Based on EPA SDWIS violation history and UCMR5 PFAS testing only, not water taste, odor, infrastructure age, or contaminants outside the federally tracked set.
System Details
- System Type
- Transient Non-Community
- Owner Type
- Private
- Connections
- 25
- County
- McCone
- School/Daycare
- No
- MCL Violations
- 2
- Monitoring Violations
- 59
- Treatment Tech Violations
- 7
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 34 | 2010 |
| Surface Water Treatment Rule | MR | 15 | 2010 |
| Revised Total Coliform Rule | MON | 6 | 2025 |
| Nitrate-Nitrite | MR | 4 | 2004 |
| Surface Water Treatment Rule | TT | 4 | 2013 |
| Revised Total Coliform Rule | TT | 3 | 2018 |
| Coliform (TCR) | MCL | 2 | 1992 |
Violation Count vs. the National Corpus
Rock Creek Marina LLC has 69 recorded EPA violations, 65% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 35% carry more. 13% of this system's own violations are health-based (9 of 69), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
69 Around the middle fewer violations than 35% 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
How many violations vs. how serious, among peer systems
Rock Creek Marina LLC plotted against 29 peer public water systems (500+ people served), by total violation count (x) and the share of those violations that are health-based (y). The crosshair sits at this sample's own median on each axis. A high violation count does not automatically mean a serious record: most monitoring and reporting violations are minor, not health-based.
Violation volume vs. health-based share
Population served record for Rock Creek Marina LLC
EPA SDWIS lists 50 people served and 25 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
69 violations · 50 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.
What to do with Rock Creek Marina LLC
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.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.