Community Water System · PWS 090400020
Vaya Chin Intertie
Operator location Sells, EPA Region 9 — Tribal Water Systems - lower-third violation load (≤ 21 violations) with 15 EPA violations; groundwater source; 1,151 served (PWS-level, not municipal population).
- 1,151
- People served (this PWS)
- 15
- EPA violations (this PWS)
- 1
- Health-based (this PWS)
- No PFAS
- UCMR5 (this PWS)
Vaya Chin Intertie standing, low SDWIS violation third
15 EPA SDWIS violations on record - lower-third violation load (≤ 21 violations). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 7% is middle-third health share (≤ 23%). UCMR5: UCMR5 tested, none detected. Population rank #18,240 of 29,740 among systems serving 500+.
The verdict
Vaya Chin Intertie is in the lower third by violation count (15; lower-third violation load (≤ 21 violations)). A low count does not mean the system is unmonitored - monitoring and reporting violations still appear in SDWIS. Population served is mid-pack at 1,151 (mid served population (≤ 3,309)). Health-based share is 7% (middle-third health share (≤ 23%)). UCMR5 tested this system and reported no PFAS above the minimum reporting level.
- #18,240 of 29,740
- Population · /systems
- #83 of 129
- Population · 09
- 15
- Total EPA violations on record
- 7%
- 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
- 110
- School/Daycare
- No
- MCL Violations
- 1
- Monitoring Violations
- 7
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 3 | 2008 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 2004 |
| Coliform (TCR) | MCL | 1 | 2001 |
| Total Haloacetic Acids (HAA5) | MR | 1 | 2014 |
| TTHM | MR | 1 | 2014 |
| Nitrate | MR | 1 | 2004 |
Violation Count vs. the National Corpus
Vaya Chin Intertie has 15 recorded EPA violations, 25% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 74% carry more. 7% of this system's own violations are health-based (1 of 15), and it ranks #18,240 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)
15 Lower than most fewer violations than 74% 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 |
|---|---|---|---|---|
| PFHxA | 5/10/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 5/10/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 5/10/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 5/10/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 5/10/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 5/10/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 5/10/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDoA | 5/10/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 5/10/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 5/10/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 5/10/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 5/10/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 5/10/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 5/10/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 5/10/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 5/10/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFDA | 5/10/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 4:2 FTS | 5/10/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NEtFOSAA | 5/10/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 5/10/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 5/10/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFHpS | 5/10/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 5/10/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 5/10/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 5/10/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 5/10/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 5/10/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 5/10/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFPeS | 5/10/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| NMeFOSAA | 5/10/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFOS | 5/10/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 5/10/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 5/10/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 5/10/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 5/10/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 5/10/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFTrDA | 5/10/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFPeS | 5/10/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| NEtFOSAA | 5/10/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFOA | 5/10/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFBA | 5/10/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMBA | 5/10/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 5/10/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 5/10/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 5/10/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 5/10/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 5/10/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 5/10/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| HFPO-DA | 5/10/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTA | 5/10/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
SDWIS compliance record for Vaya Chin Intertie
15 violations on record for 090400020; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS
Nationwide peers
15 violations · 1,151 served: nearest cross-state SDWIS matches.
Cross-state systems with similarly light violation ledgers
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 Vaya Chin Intertie
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.