Community Water System · PWS 083090075
Rocky Boy's Rural Water
Operator location Box Elder, EPA Region 8 — Tribal Water Systems - upper-third violation load (> 74 violations) with 130 EPA violations; groundwater source; 2,000 served (PWS-level, not municipal population).
- 2,000
- People served (this PWS) Middle third of systems
- 130
- EPA violations (this PWS) Upper third of systems
- 23
- Health-based (this PWS) Middle third by health-based share
- Untested
- UCMR5 (this PWS) No UCMR5 result
Rocky Boy's Rural Water standing, high SDWIS violation third
130 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 18% is middle-third health share (≤ 23%). Population rank #13,528 of 29,740 among systems serving 500+.
The verdict
Rocky Boy's Rural Water sits in the upper third of the sitemap cohort by violation count (130), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 2,000 (mid served population (≤ 3,309)). Health-based share is 18% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #13,528 of 29,740
- Population · /systems
- #23 of 55
- Population · 08
- 130
- Total EPA violations on record
- 18%
- Health-based (MCL / treatment failure)
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
- Community
- Owner Type
- Native American
- Connections
- 477
- School/Daycare
- No
- MCL Violations
- 21
- Monitoring Violations
- 99
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 21 | 2009 |
| Coliform (TCR) | MR | 13 | 2003 |
| Asbestos | MR | 4 | 2021 |
| Diquat | MR | 2 | 2017 |
| Endothall | MR | 2 | 2017 |
| Glyphosate | MR | 2 | 2017 |
| Cadmium | MR | 2 | 2014 |
| Consumer Confidence Rule | Other | 2 | 2014 |
| Antimony, Total | MR | 2 | 2014 |
| Chromium | MR | 2 | 2014 |
| Thallium, Total | MR | 2 | 2014 |
| Nickel | MR | 2 | 2014 |
| Barium | MR | 2 | 2014 |
| Groundwater Rule | TT | 2 | 2017 |
| Arsenic | MR | 2 | 2014 |
| Selenium | MR | 2 | 2014 |
| Mercury | MR | 2 | 2014 |
| Beryllium, Total | MR | 2 | 2014 |
| Lead and Copper Rule | MR | 2 | 2011 |
| Endrin | MR | 1 | 2014 |
| Toxaphene | MR | 1 | 2014 |
| OXAMYL | MR | 1 | 2014 |
| Simazine | MR | 1 | 2014 |
| Picloram | MR | 1 | 2014 |
| Dinoseb | MR | 1 | 2014 |
| Carbofuran | MR | 1 | 2014 |
| LASSO | MR | 1 | 2014 |
| 2,3,7,8-TCDD | MR | 1 | 2014 |
| Heptachlor epoxide | MR | 1 | 2014 |
| 2,4-D | MR | 1 | 2014 |
Violation Count vs. the National Corpus
Rocky Boy's Rural Water has 130 recorded EPA violations, 78% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 21% carry more. 18% of this system's own violations are health-based (23 of 130), and it ranks #13,528 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)
130 Higher than most more violations than 78% 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
Rocky Boy's Rural Water 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
SDWIS compliance record for Rocky Boy's Rural Water
130 violations on record for 083090075; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS
Nationwide peers
130 violations · 2,000 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's Rural Water
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.
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.