Community Water System · PWS 090400692
GRIC DPW Wild Horse Pass
Operator location Sacaton, EPA Region 9 — Tribal Water Systems - larger served population (> 3,309) at 22,795 people served; 72 SDWIS violations on record from groundwater sources.
- 22,795
- People served (this PWS)
- 72
- EPA violations (this PWS)
- 15
- Health-based (this PWS)
- No PFAS
- UCMR5 (this PWS)
GRIC DPW Wild Horse Pass standing, mid SDWIS violation third
22,795 people served (SDWIS) - larger served population (> 3,309). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 21% is middle-third health share (≤ 23%). UCMR5: UCMR5 tested, none detected. Population rank #2,441 of 29,740 among systems serving 500+.
The verdict
GRIC DPW Wild Horse Pass lands in the middle third by violation volume (72), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is large (22,795; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 21% (middle-third health share (≤ 23%)). UCMR5 tested this system and reported no PFAS above the minimum reporting level.
- #2,441 of 29,740
- Population · /systems
- #3 of 129
- Population · 09
- 72
- 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
- Native American
- Connections
- 820
- School/Daycare
- No
- MCL Violations
- 13
- Monitoring Violations
- 42
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 36 | 2008 |
| Coliform (TCR) | MCL | 10 | 2015 |
| Nitrate | MR | 3 | 2006 |
| Arsenic | MCL | 2 | 2009 |
| LEAD AND COPPER RULE REVISIONS | TT | 2 | 2024 |
| Asbestos | MR | 1 | 2001 |
| Revised Total Coliform Rule | MCL | 1 | 2018 |
| Arsenic | MR | 1 | 2023 |
| Lead and Copper Rule | MR | 1 | 2023 |
Violation Count vs. the National Corpus
GRIC DPW Wild Horse Pass has 72 recorded EPA violations, 66% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 34% carry more. 21% of this system's own violations are health-based (15 of 72), and it ranks #2,441 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)
72 Around the middle fewer violations than 34% 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
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 116 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| 6:2 FTS | 5/20/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 5/20/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 5/20/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 5/20/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 5/20/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 5/20/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 5/20/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 5/20/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 5/20/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 5/20/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpA | 5/20/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 5/20/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| NFDHA | 5/20/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFBS | 5/20/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 5/20/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 5/20/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 5/20/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 5/20/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDoA | 5/20/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 5/20/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 5/20/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 5/20/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 5/20/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 5/20/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 5/20/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| NEtFOSAA | 4/30/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 4/30/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| NMeFOSAA | 4/30/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFTA | 4/30/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFDoA | 4/30/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 4/30/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 4/30/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 4/30/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 4/30/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 4/30/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 4/30/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBS | 4/30/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 4/30/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxA | 4/30/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 4/30/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 4/30/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 4/30/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 4/30/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 4/30/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 4/30/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 4/30/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 4/30/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 4/30/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMBA | 4/30/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 4/30/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
Population served record for GRIC DPW Wild Horse Pass
EPA SDWIS lists 22,795 people served and 820 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
72 violations · 22,795 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 similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with GRIC DPW Wild Horse Pass
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.