Community Water System · PWS 083090011
Crow Agency Water System
Operator location Crow Agency, EPA Region 8 — Tribal Water Systems - upper-third violation load (> 74 violations) with 254 EPA violations; surface water source; 1,300 served (PWS-level, not municipal population).
- 1,300
- People served (this PWS)
- 254
- EPA violations (this PWS)
- 54
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Crow Agency Water System standing, high SDWIS violation third
254 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 21% is middle-third health share (≤ 23%). Population rank #17,113 of 29,740 among systems serving 500+.
The verdict
Crow Agency Water System sits in the upper third of the sitemap cohort by violation count (254), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 1,300 (mid served population (≤ 3,309)). Health-based share is 21% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #17,113 of 29,740
- Population · /systems
- #34 of 55
- Population · 08
- 254
- Total EPA violations on record
- 21%
- 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
- Federal
- Connections
- 510
- School/Daycare
- No
- MCL Violations
- 3
- Monitoring Violations
- 187
- Treatment Tech Violations
- 51
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Interim Enhanced Surface Water Treatment Rule | MR | 54 | 2025 |
| CARBON, TOTAL | MR | 36 | 2023 |
| CARBON, TOTAL | TT | 28 | 2020 |
| Surface Water Treatment Rule | MR | 24 | 2013 |
| Coliform (TCR) | MR | 19 | 2013 |
| Long Term 2 Enhanced Surface Water Treatment Rule | TT | 9 | 2017 |
| Interim Enhanced Surface Water Treatment Rule | TT | 8 | 2012 |
| Interim Enhanced Surface Water Treatment Rule | Other | 6 | 2016 |
| Surface Water Treatment Rule | TT | 6 | 2012 |
| TTHM | MR | 4 | 2006 |
| Lead and Copper Rule | MR | 4 | 2021 |
| Total Haloacetic Acids (HAA5) | MR | 4 | 2006 |
| Coliform (TCR) | MCL | 3 | 2006 |
| Mercury | MR | 2 | 2023 |
| Selenium | MR | 2 | 2023 |
| Barium | MR | 2 | 2023 |
| Arsenic | MR | 2 | 2023 |
| Cadmium | MR | 2 | 2023 |
| Chromium | MR | 2 | 2023 |
| Consumer Confidence Rule | Other | 1 | 2023 |
| 1,2,4-Trichlorobenzene | MR | 1 | 2023 |
| cis-1,2-Dichloroethylene | MR | 1 | 2023 |
| Xylenes, Total | MR | 1 | 2023 |
| o-Dichlorobenzene | MR | 1 | 2023 |
| 1,1,1-Trichloroethane | MR | 1 | 2023 |
| Trichloroethylene | MR | 1 | 2023 |
| 1,1,2-Trichloroethane | MR | 1 | 2023 |
| CHLOROBENZENE | MR | 1 | 2023 |
| Benzene | MR | 1 | 2023 |
| Toluene | MR | 1 | 2023 |
Violation Count vs. the National Corpus
Crow Agency Water System has 254 recorded EPA violations, 88% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 12% carry more. 21% of this system's own violations are health-based (54 of 254), and it ranks #17,113 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)
254 Higher than most more violations than 88% 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 Crow Agency Water System
254 violations on record for 083090011; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS
Nationwide peers
254 violations · 1,300 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 Crow 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.