Transient Non-Community Water System · PWS MT0001957
Greycliff Rest Area Eastbound
Operator location Billings, Montana - 52% of 119 violations are health-based (upper-third health share (> 23%)); groundwater source; 2,500 served per SDWIS.
- 2,500
- People served (this PWS)
- 119
- EPA violations (this PWS)
- 62
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Greycliff Rest Area Eastbound standing, high SDWIS violation third
52% of 119 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 52% is upper-third health share (> 23%). Population rank #11,929 of 29,740 among systems serving 500+.
The verdict
Greycliff Rest Area Eastbound sits in the upper third of the sitemap cohort by violation count (119), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 2,500 (mid served population (≤ 3,309)). Health-based share is 52% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #11,929 of 29,740
- Population · /systems
- #53 of 283
- Population · MT
- 119
- Total EPA violations on record
- 52%
- 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
- State
- Connections
- 1
- County
- Sweet Grass
- School/Daycare
- No
- MCL Violations
- 62
- Monitoring Violations
- 57
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 40 | 2014 |
| Coliform (TCR) | MR | 28 | 2014 |
| Revised Total Coliform Rule | MCL | 19 | 2024 |
| E. COLI | MR | 18 | 2025 |
| Nitrate-Nitrite | MR | 8 | 2022 |
| Nitrate | MCL | 3 | 1981 |
| Revised Total Coliform Rule | MON | 3 | 2018 |
Violation Count vs. the National Corpus
Greycliff Rest Area Eastbound has 119 recorded EPA violations, 77% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 23% carry more. 52% of this system's own violations are health-based (62 of 119), and it ranks #11,929 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)
119 Higher than most more violations than 77% 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
Health-based violations on Greycliff Rest Area Eastbound
62 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for MT0001957.
Sources: EPA SDWIS
Nationwide peers
119 violations · 2,500 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 Greycliff Rest Area Eastbound
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.