Community Water System · PWS 090400106
Polacca
Operator location Polacca, EPA Region 9 — Tribal Water Systems - 27% of 473 violations are health-based (upper-third health share (> 23%)); groundwater source; 4,108 served per SDWIS.
- 4,108
- People served (this PWS)
- 473
- EPA violations (this PWS)
- 126
- Health-based (this PWS)
- No PFAS
- UCMR5 (this PWS)
Polacca standing, high SDWIS violation third
27% of 473 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 27% is upper-third health share (> 23%). UCMR5: UCMR5 tested, none detected. Population rank #8,707 of 29,740 among systems serving 500+.
The verdict
Polacca sits in the upper third of the sitemap cohort by violation count (473), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (4,108; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 27% - most of this ledger is MCL or treatment-technique exceedance. UCMR5 tested this system and reported no PFAS above the minimum reporting level.
- #8,707 of 29,740
- Population · /systems
- #34 of 129
- Population · 09
- 473
- Total EPA violations on record
- 27%
- 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
- 450
- School/Daycare
- No
- MCL Violations
- 124
- Monitoring Violations
- 283
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MCL | 117 | 2023 |
| Arsenic | MR | 29 | 2022 |
| Coliform (TCR) | MR | 26 | 2015 |
| Public Notice | Other | 15 | 2022 |
| Nitrate | MR | 12 | 2022 |
| Chlorine | MR | 8 | 2023 |
| Coliform (TCR) | MCL | 7 | 2009 |
| Total Haloacetic Acids (HAA5) | MR | 6 | 2015 |
| TTHM | MR | 6 | 2015 |
| E. COLI | MR | 6 | 2023 |
| Glyphosate | MR | 4 | 2020 |
| Picloram | MR | 4 | 2020 |
| 2,4-D | MR | 4 | 2020 |
| Benzo(a)pyrene | MR | 4 | 2020 |
| Barium | MR | 3 | 2011 |
| Cadmium | MR | 3 | 2011 |
| Chromium | MR | 3 | 2011 |
| CYANIDE | MR | 3 | 2011 |
| Fluoride | MR | 3 | 2011 |
| Mercury | MR | 3 | 2011 |
| Selenium | MR | 3 | 2011 |
| Antimony, Total | MR | 3 | 2011 |
| Beryllium, Total | MR | 3 | 2011 |
| Endrin | MR | 3 | 2011 |
| Methoxychlor | MR | 3 | 2011 |
| BHC-GAMMA | MR | 3 | 2011 |
| Toxaphene | MR | 3 | 2011 |
| Dalapon | MR | 3 | 2011 |
| Endothall | MR | 3 | 2011 |
| Di(2-ethylhexyl) adipate | MR | 3 | 2011 |
Violation Count vs. the National Corpus
Polacca has 473 recorded EPA violations, 95% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 5% carry more. 27% of this system's own violations are health-based (126 of 473), and it ranks #8,707 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)
473 Higher than most more violations than 95% 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 58 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFHxS | 4/30/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 4/30/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 4/30/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFUnA | 4/30/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxA | 4/30/2025 | <3.00 ppt | 3.00 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 |
| PFBA | 4/30/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFNA | 4/30/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| ADONA | 4/30/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 4/30/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 4/30/2025 | <6.00 ppt | 6.00 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 |
| PFTA | 4/30/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFBS | 4/30/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 4/30/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFMBA | 4/30/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 4/30/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 4/30/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 4/30/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 4/30/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFEESA | 4/30/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 4/30/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 8:2 FTS | 4/30/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 4/30/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 4/30/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 4/30/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| NMeFOSAA | 4/15/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFTA | 4/15/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| NEtFOSAA | 4/15/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxA | 4/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTrDA | 4/15/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFDoA | 4/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 4/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 4/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 4/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 4/15/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 4/15/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 4/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 4/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 4/15/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 4/15/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 4/15/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDA | 4/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 4/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 4/15/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 9Cl-PF3ONS | 4/15/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 4/15/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
Health-based violations on Polacca
126 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for 090400106.
Sources: EPA SDWIS
Nationwide peers
473 violations · 4,108 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.
Cross-state systems with similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Polacca
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.