Community Water System · PWS 083090079
Rocky Boy Agency Water System
Operator location Box Elder, EPA Region 8 — Tribal Water Systems - upper-third violation load (> 74 violations) with 109 EPA violations; groundwater source; 1,442 served (PWS-level, not municipal population).
- 1,442
- People served (this PWS)
- 109
- EPA violations (this PWS)
- 15
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Rocky Boy Agency Water System standing, high SDWIS violation third
109 EPA SDWIS violations on record - upper-third violation load (> 74 violations). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 14% is middle-third health share (≤ 23%). Population rank #16,328 of 29,740 among systems serving 500+.
The verdict
Rocky Boy Agency Water System sits in the upper third of the sitemap cohort by violation count (109), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 1,442 (mid served population (≤ 3,309)). Health-based share is 14% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #16,328 of 29,740
- Population · /systems
- #32 of 55
- Population · 08
- 109
- Total EPA violations on record
- 14%
- 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
- Native American
- Connections
- 150
- School/Daycare
- Yes
- MCL Violations
- 14
- Monitoring Violations
- 86
- Treatment Tech Violations
- 1
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 28 | 2009 |
| Coliform (TCR) | MCL | 14 | 2005 |
| Groundwater Rule | Other | 5 | 2012 |
| Asbestos | MR | 3 | 2023 |
| Consumer Confidence Rule | Other | 2 | 2014 |
| Xylenes, Total | MR | 2 | 2020 |
| Toluene | MR | 2 | 2020 |
| 1,2,4-Trichlorobenzene | MR | 1 | 2014 |
| p-Dichlorobenzene | MR | 1 | 2014 |
| Vinyl chloride | MR | 1 | 2014 |
| 1,2-Dichloroethane | MR | 1 | 2014 |
| 1,2-Dichloropropane | MR | 1 | 2014 |
| Benzene | MR | 1 | 2014 |
| Styrene | MR | 1 | 2014 |
| Endrin | MR | 1 | 2014 |
| BHC-GAMMA | MR | 1 | 2014 |
| Methoxychlor | MR | 1 | 2014 |
| Toxaphene | MR | 1 | 2014 |
| Diquat | MR | 1 | 2014 |
| Endothall | MR | 1 | 2014 |
| Di(2-ethylhexyl) adipate | MR | 1 | 2014 |
| OXAMYL | MR | 1 | 2014 |
| Simazine | MR | 1 | 2014 |
| Hexachlorocyclopentadiene | MR | 1 | 2014 |
| Carbofuran | MR | 1 | 2014 |
| Atrazine | MR | 1 | 2014 |
| 2,3,7,8-TCDD | MR | 1 | 2014 |
| Heptachlor | MR | 1 | 2014 |
| 2,4-D | MR | 1 | 2014 |
| 2,4,5-TP | MR | 1 | 2014 |
Violation Count vs. the National Corpus
Rocky Boy Agency Water System has 109 recorded EPA violations, 75% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 25% carry more. 14% of this system's own violations are health-based (15 of 109), and it ranks #16,328 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)
109 Around the middle fewer violations than 25% 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
SDWIS compliance record for Rocky Boy Agency Water System
109 violations on record for 083090079; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS
Nationwide peers
109 violations · 1,442 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 Rocky Boy Agency Water System
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in EPA Region 8 — Tribal Water Systems compares on the same EPA violation measures. EPA Region 8 — Tribal Water Systems 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.