Community Water System · PWS 090400035
San Xavier West
Operator location Sells, EPA Region 9 — Tribal Water Systems - 7% of 45 violations are health-based (middle-third health share (≤ 23%)); groundwater source; 1,511 served per SDWIS.
- 1,511
- People served (this PWS)
- 45
- EPA violations (this PWS)
- 3
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
San Xavier West standing, mid SDWIS violation third
7% of 45 recorded violations are health-based - middle-third health share (≤ 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 7% is middle-third health share (≤ 23%). Population rank #15,795 of 29,740 among systems serving 500+.
The verdict
San Xavier West lands in the middle third by violation volume (45), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is mid-pack at 1,511 (mid served population (≤ 3,309)). Health-based share is 7% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #15,795 of 29,740
- Population · /systems
- #73 of 129
- Population · 09
- 45
- 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
- 394
- School/Daycare
- No
- MCL Violations
- 3
- Monitoring Violations
- 39
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MR | 3 | 2024 |
| Coliform (TCR) | MCL | 3 | 2004 |
| Nitrate | MR | 3 | 2006 |
| Endrin | MR | 1 | 2004 |
| BHC-GAMMA | MR | 1 | 2004 |
| Dalapon | MR | 1 | 2004 |
| Diquat | MR | 1 | 2004 |
| Glyphosate | MR | 1 | 2004 |
| Di(2-ethylhexyl) phthalate | MR | 1 | 2004 |
| Picloram | MR | 1 | 2004 |
| Hexachlorocyclopentadiene | MR | 1 | 2004 |
| Atrazine | MR | 1 | 2004 |
| 2,3,7,8-TCDD | MR | 1 | 2004 |
| 2,4,5-TP | MR | 1 | 2004 |
| HEXACHLOROBENZENE | MR | 1 | 2004 |
| Total Polychlorinated Biphenyls (PCB) | MR | 1 | 2004 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 1 | 2004 |
| ETHYLENE DIBROMIDE | MR | 1 | 2004 |
| Chlordane | MR | 1 | 2004 |
| Combined Radium (-226 and -228) | MR | 1 | 2019 |
| Pentachlorophenol | MR | 1 | 2004 |
| Dinoseb | MR | 1 | 2004 |
| Heptachlor | MR | 1 | 2004 |
| Di(2-ethylhexyl) adipate | MR | 1 | 2004 |
| OXAMYL | MR | 1 | 2004 |
| 2,4-D | MR | 1 | 2004 |
| Asbestos | MR | 1 | 2004 |
| Toxaphene | MR | 1 | 2004 |
| Methoxychlor | MR | 1 | 2004 |
| Benzo(a)pyrene | MR | 1 | 2004 |
Violation Count vs. the National Corpus
San Xavier West has 45 recorded EPA violations, 54% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 46% carry more. 7% of this system's own violations are health-based (3 of 45), and it ranks #15,795 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)
45 Around the middle fewer violations than 46% 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
Health-based violations on San Xavier West
3 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for 090400035.
Sources: EPA SDWIS
Nationwide peers
45 violations · 1,511 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 near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with San Xavier West
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.