Community Water System · PWS OK1021222
Otoe-Missouria Tribe
Operator location Red Rock, Oklahoma - 59% of 1,707 violations are health-based (upper-third health share (> 23%)); surface water source; 250 served per SDWIS.
- 250
- People served (this PWS)
- 1,707
- EPA violations (this PWS)
- 1,001
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Otoe-Missouria Tribe standing, high SDWIS violation third
59% of 1,707 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 59% is upper-third health share (> 23%).
The verdict
Otoe-Missouria Tribe sits in the upper third of the sitemap cohort by violation count (1,707), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (250; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 59% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- 1,707
- Total EPA violations on record
- 59%
- Health-based (MCL / treatment failure)
- 250
- 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.
System Details
- System Type
- Community
- Owner Type
- Native American
- Connections
- 92
- County
- Noble
- School/Daycare
- No
- MCL Violations
- 574
- Monitoring Violations
- 696
- Treatment Tech Violations
- 427
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| TTHM | MCL | 473 | 2023 |
| CARBON, TOTAL | TT | 388 | 2019 |
| Interim Enhanced Surface Water Treatment Rule | MR | 297 | 2016 |
| CARBON, TOTAL | MR | 191 | 2011 |
| Total Haloacetic Acids (HAA5) | MCL | 101 | 2019 |
| Coliform (TCR) | MR | 64 | 2011 |
| TTHM | MR | 56 | 2018 |
| Total Haloacetic Acids (HAA5) | MR | 50 | 2018 |
| Interim Enhanced Surface Water Treatment Rule | TT | 33 | 2018 |
| Lead and Copper Rule | MR | 13 | 2011 |
| Nitrate-Nitrite | MR | 10 | 2016 |
| Consumer Confidence Rule | Other | 7 | 2016 |
| Chlorine | MR | 5 | 2004 |
| Surface Water Treatment Rule | TT | 4 | 2018 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule | MR | 3 | 2010 |
| E. COLI | MR | 2 | 2008 |
| Long Term 2 Enhanced Surface Water Treatment Rule | TT | 2 | 2010 |
| Nitrate | MR | 2 | 2002 |
| Long Term 2 Enhanced Surface Water Treatment Rule | MR | 2 | 2008 |
| Surface Water Treatment Rule | MR | 1 | 2004 |
Violation Count vs. the National Corpus
Otoe-Missouria Tribe has 1,707 recorded EPA violations, 100% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 0% carry more. 59% of this system's own violations are health-based (1,001 of 1,707), 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)
1,707 Higher than most more violations than 99%+ 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 Otoe-Missouria Tribe
1,001 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for OK1021222.
Sources: EPA SDWIS
Nationwide peers
1,707 violations · 250 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.
What to do with Otoe-Missouria Tribe
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Oklahoma compares on the same EPA violation measures. Oklahoma 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.