Community Water System · PWS 063500120
Santo Domingo Pueblo
Operator location Santo Domingo, EPA Region 6 — Tribal Water Systems - 28% of 127 violations are health-based (upper-third health share (> 23%)); groundwater source; 5,455 served per SDWIS.
- 5,455
- People served (this PWS)
- 127
- EPA violations (this PWS)
- 35
- Health-based (this PWS)
- No PFAS
- UCMR5 (this PWS)
Santo Domingo Pueblo standing, high SDWIS violation third
28% of 127 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 28% is upper-third health share (> 23%). UCMR5: UCMR5 tested, none detected. Population rank #7,308 of 29,740 among systems serving 500+.
The verdict
Santo Domingo Pueblo sits in the upper third of the sitemap cohort by violation count (127), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (5,455; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 28% - most of this ledger is MCL or treatment-technique exceedance. UCMR5 tested this system and reported no PFAS above the minimum reporting level.
- #7,308 of 29,740
- Population · /systems
- #12 of 54
- Population · 06
- 127
- Total EPA violations on record
- 28%
- 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
- 699
- School/Daycare
- No
- MCL Violations
- 30
- Monitoring Violations
- 59
- Treatment Tech Violations
- 5
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 33 | 2016 |
| Coliform (TCR) | MCL | 30 | 2008 |
| Public Notice | Other | 20 | 2012 |
| Consumer Confidence Rule | Other | 8 | 2006 |
| Groundwater Rule | TT | 5 | 2017 |
| Total Haloacetic Acids (HAA5) | MR | 2 | 2015 |
| TTHM | MR | 2 | 2015 |
| Revised Total Coliform Rule | MON | 1 | 2022 |
| 1,2,4-Trichlorobenzene | MR | 1 | 2009 |
| Vinyl chloride | MR | 1 | 2009 |
| 1,1-Dichloroethylene | MR | 1 | 2009 |
| 1,2-Dichloropropane | MR | 1 | 2009 |
| 1,2-Dichloroethane | MR | 1 | 2009 |
| 1,1,1-Trichloroethane | MR | 1 | 2009 |
| 1,1,2-Trichloroethane | MR | 1 | 2009 |
| Tetrachloroethylene | MR | 1 | 2009 |
| CHLOROBENZENE | MR | 1 | 2009 |
| Benzene | MR | 1 | 2009 |
| Ethylbenzene | MR | 1 | 2009 |
| Styrene | MR | 1 | 2009 |
| Toluene | MR | 1 | 2009 |
| cis-1,2-Dichloroethylene | MR | 1 | 2009 |
| Carbon tetrachloride | MR | 1 | 2009 |
| DICHLOROMETHANE | MR | 1 | 2009 |
| p-Dichlorobenzene | MR | 1 | 2009 |
| trans-1,2-Dichloroethylene | MR | 1 | 2009 |
| Xylenes, Total | MR | 1 | 2009 |
| o-Dichlorobenzene | MR | 1 | 2009 |
| Trichloroethylene | MR | 1 | 2009 |
Violation Count vs. the National Corpus
Santo Domingo Pueblo has 127 recorded EPA violations, 78% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 22% carry more. 28% of this system's own violations are health-based (35 of 127), and it ranks #7,308 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)
127 Higher than most more violations than 78% 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 |
|---|---|---|---|---|
| ADONA | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 7/22/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 7/22/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxA | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 7/22/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFOA | 7/22/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 7/22/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 7/22/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 7/22/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 7/22/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFHpA | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 7/22/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 7/22/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 7/22/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 7/22/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFMBA | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 7/22/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 7/22/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 7/22/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| NEtFOSAA | 7/22/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBS | 7/22/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTrDA | 7/22/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFDA | 11/20/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 11/20/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 11/20/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFDoA | 11/20/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 11/20/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 11/20/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 11/20/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 11/20/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 11/20/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 11/20/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 11/20/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 11/20/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 11/20/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 11/20/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 11/20/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| NEtFOSAA | 11/20/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxA | 11/20/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 4:2 FTS | 11/20/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 11/20/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFTrDA | 11/20/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 11/20/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
Health-based violations on Santo Domingo Pueblo
35 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for 063500120.
Sources: EPA SDWIS
Nationwide peers
127 violations · 5,455 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 Santo Domingo Pueblo
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in EPA Region 6 — Tribal Water Systems compares on the same EPA violation measures. EPA Region 6 — 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.