Community Water System · PWS 090400092
GRIC DPW Casa Blanca_Bapchule
Operator location Sacaton, EPA Region 9 — Tribal Water Systems - 15% of 74 violations are health-based (middle-third health share (≤ 23%)); groundwater source; 2,603 served per SDWIS.
- 2,603
- People served (this PWS)
- 74
- EPA violations (this PWS)
- 11
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
GRIC DPW Casa Blanca_Bapchule standing, mid SDWIS violation third
15% of 74 recorded violations are health-based - middle-third health share (≤ 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 15% is middle-third health share (≤ 23%). Population rank #11,578 of 29,740 among systems serving 500+.
The verdict
GRIC DPW Casa Blanca_Bapchule lands in the middle third by violation volume (74), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is mid-pack at 2,603 (mid served population (≤ 3,309)). Health-based share is 15% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #11,578 of 29,740
- Population · /systems
- #51 of 129
- Population · 09
- 74
- Total EPA violations on record
- 15%
- 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
- 719
- School/Daycare
- No
- MCL Violations
- 9
- Monitoring Violations
- 38
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 11 | 1996 |
| Coliform (TCR) | MCL | 9 | 2009 |
| Nitrate | MR | 6 | 2023 |
| Mercury | MR | 3 | 2001 |
| Lead and Copper Rule | MR | 3 | 2023 |
| Arsenic | MR | 2 | 1996 |
| Barium | MR | 2 | 1996 |
| Cadmium | MR | 2 | 1996 |
| Fluoride | MR | 2 | 1996 |
| Chromium | MR | 2 | 1996 |
| Selenium | MR | 2 | 1996 |
| LEAD AND COPPER RULE REVISIONS | TT | 2 | 2024 |
| BHC-GAMMA | MR | 1 | 2001 |
| Total Polychlorinated Biphenyls (PCB) | MR | 1 | 2001 |
| Xylenes, Total | MR | 1 | 2001 |
| Consumer Confidence Rule | Other | 1 | 2001 |
Violation Count vs. the National Corpus
GRIC DPW Casa Blanca_Bapchule has 74 recorded EPA violations, 66% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 33% carry more. 15% of this system's own violations are health-based (11 of 74), and it ranks #11,578 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)
74 Around the middle fewer violations than 33% 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 GRIC DPW Casa Blanca_Bapchule
11 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for 090400092.
Sources: EPA SDWIS
Nationwide peers
74 violations · 2,603 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 near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with GRIC DPW Casa Blanca_Bapchule
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in EPA Region 9 — Tribal Water Systems compares on the same EPA violation measures. EPA Region 9 — 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.