Community Water System · PWS 090400090
Ak-Chin Village
Operator location Maricopa, EPA Region 9 — Tribal Water Systems - UCMR5 detected 1 PFAS compound (lower-third PFAS panel (≤ 2 compounds)) on this PWS; SDWIS lists 57 violations and 11,646 people served.
- 11,646
- People served (this PWS)
- 57
- EPA violations (this PWS)
- 10
- Health-based (this PWS)
- 1 PFAS
- UCMR5 (this PWS)
Ak-Chin Village standing, mid SDWIS violation third
UCMR5 detected 1 PFAS compound - lower-third PFAS panel (≤ 2 compounds). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 18% is middle-third health share (≤ 23%). UCMR5: lower-third PFAS panel (≤ 2 compounds). Population rank #4,204 of 29,740 among systems serving 500+.
The verdict
Ak-Chin Village lands in the middle third by violation volume (57), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is large (11,646; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 18% (middle-third health share (≤ 23%)). UCMR5 detected 1 PFAS compound (lower-third PFAS panel (≤ 2 compounds)).
- #4,204 of 29,740
- Population · /systems
- #12 of 129
- Population · 09
- 57
- Total EPA violations on record
- 18%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Native American
- Connections
- 364
- School/Daycare
- No
- MCL Violations
- 9
- Monitoring Violations
- 30
- Treatment Tech Violations
- 1
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 14 | 2012 |
| Nitrate | MR | 7 | 2011 |
| Coliform (TCR) | MCL | 6 | 2009 |
| Public Notice | Other | 3 | 2024 |
| Nitrite | MCL | 2 | 2002 |
| Combined Uranium | MR | 2 | 2013 |
| Fluoride | MCL | 1 | 2002 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 2001 |
| Combined Radium (-226 and -228) | MR | 1 | 2013 |
| Total Haloacetic Acids (HAA5) | MR | 1 | 2020 |
| TTHM | MR | 1 | 2020 |
| Interim Enhanced Surface Water Treatment Rule | TT | 1 | 2017 |
| Consumer Confidence Rule | Other | 1 | 2002 |
| 2,3,7,8-TCDD | MR | 1 | 2001 |
| Lead and Copper Rule | MR | 1 | 2023 |
| Revised Total Coliform Rule | MON | 1 | 2024 |
Violation Count vs. the National Corpus
Ak-Chin Village has 57 recorded EPA violations, 60% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 40% carry more. 18% of this system's own violations are health-based (10 of 57), and it ranks #4,204 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)
57 Around the middle fewer violations than 40% 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. 1 of 116 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFDoA | 8/31/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 8/31/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 8/31/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 8/31/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/31/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/31/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxA | 8/31/2023 | 3.00 ppt | 3.00 ppt | Detected |
| PFDA | 8/31/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 8/31/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFOS | 8/31/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeS | 8/31/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFUnA | 8/31/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| 4:2 FTS | 8/31/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 8/31/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 8/31/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 8/31/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 8/31/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 8/31/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFHpS | 8/31/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 8/31/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 8/31/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 8/31/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 8/31/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFNA | 8/31/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 8/31/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 8/31/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 8/31/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpA | 8/31/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 8/31/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| ADONA | 5/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 5/17/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 5/17/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 5/17/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxA | 5/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 5/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 5/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 5/17/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 5/17/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| HFPO-DA | 5/17/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 8:2 FTS | 5/17/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBS | 5/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 5/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 5/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 5/17/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeS | 5/17/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| 6:2 FTS | 5/17/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 5/17/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFEESA | 5/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 5/17/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 5/17/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
UCMR5 PFAS record for Ak-Chin Village
Open EPA SDWIS federal reports for PWS 090400090 to cross-check UCMR5 detections and violation codes; state primacy agencies enforce the Safe Drinking Water Act locally.
Sources: EPA SDWIS
Nationwide peers
57 violations · 11,646 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 Ak-Chin Village
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.