Non-Transient Non-Community Water System · PWS 070000017
Blackbird Bend Casino
Operator location Onawa, EPA Region 7 — Tribal Water Systems - 42% of 62 violations are health-based (upper-third health share (> 23%)); groundwater source; 546 served per SDWIS.
- 546
- People served (this PWS)
- 62
- EPA violations (this PWS)
- 26
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Blackbird Bend Casino standing, mid SDWIS violation third
42% of 62 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 42% is upper-third health share (> 23%). Population rank #27,620 of 29,740 among systems serving 500+.
The verdict
Blackbird Bend Casino lands in the middle third by violation volume (62), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (546; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 42% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #27,620 of 29,740
- Population · /systems
- #9 of 10
- Population · 07
- 62
- Total EPA violations on record
- 42%
- 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
- Non-Transient Non-Community
- Owner Type
- Native American
- Connections
- 3
- School/Daycare
- No
- MCL Violations
- 10
- Monitoring Violations
- 32
- Treatment Tech Violations
- 16
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Groundwater Rule | TT | 16 | 2015 |
| Coliform (TCR) | MR | 14 | 2015 |
| Coliform (TCR) | MCL | 10 | 2015 |
| Revised Total Coliform Rule | MON | 10 | 2024 |
| Chlorine | MR | 6 | 2024 |
| Lead and Copper Rule | MR | 2 | 2024 |
Violation Count vs. the National Corpus
Blackbird Bend Casino has 62 recorded EPA violations, 62% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 37% carry more. 42% of this system's own violations are health-based (26 of 62), and it ranks #27,620 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)
62 Around the middle fewer violations than 37% 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 Blackbird Bend Casino
26 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for 070000017.
Sources: EPA SDWIS
Nationwide peers
62 violations · 546 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Blackbird Bend Casino
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in EPA Region 7 — Tribal Water Systems compares on the same EPA violation measures. EPA Region 7 — 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.