Community Water System · PWS 090400107
Sipaulovi (Lower Sipaulovi/Lower Mishongnovi)
EPA Region 9 — Tribal Water Systems - 32% of 391 violations are health-based (upper-third health share (> 23%)); groundwater source; 609 served per SDWIS.
- 609
- People served (this PWS)
- 391
- EPA violations (this PWS)
- 124
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Sipaulovi (Lower Sipaulovi/Lower Mishongnovi) standing, high SDWIS violation third
32% of 391 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 32% is upper-third health share (> 23%). Population rank #25,974 of 29,740 among systems serving 500+.
The verdict
Sipaulovi (Lower Sipaulovi/Lower Mishongnovi) sits in the upper third of the sitemap cohort by violation count (391), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (609; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 32% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #25,974 of 29,740
- Population · /systems
- #118 of 129
- Population · 09
- 391
- Total EPA violations on record
- 32%
- 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
- 134
- School/Daycare
- No
- MCL Violations
- 121
- Monitoring Violations
- 214
- Treatment Tech Violations
- 3
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MCL | 121 | 2022 |
| Coliform (TCR) | MR | 26 | 2008 |
| Arsenic | MR | 14 | 2016 |
| Public Notice | Other | 12 | 2023 |
| Nitrate | MR | 6 | 2013 |
| BHC-GAMMA | MR | 4 | 2011 |
| Methoxychlor | MR | 4 | 2011 |
| Toxaphene | MR | 4 | 2011 |
| Carbofuran | MR | 4 | 2011 |
| Atrazine | MR | 4 | 2011 |
| LASSO | MR | 4 | 2011 |
| Heptachlor | MR | 4 | 2011 |
| Heptachlor epoxide | MR | 4 | 2011 |
| 2,4-D | MR | 4 | 2011 |
| 2,4,5-TP | MR | 4 | 2011 |
| Pentachlorophenol | MR | 4 | 2011 |
| Total Polychlorinated Biphenyls (PCB) | MR | 4 | 2011 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 4 | 2011 |
| ETHYLENE DIBROMIDE | MR | 4 | 2011 |
| Chlordane | MR | 4 | 2011 |
| 2,3,7,8-TCDD | MR | 3 | 2011 |
| Revised Total Coliform Rule | MON | 3 | 2025 |
| Consumer Confidence Rule | Other | 3 | 2008 |
| Barium | MR | 2 | 2011 |
| Cadmium | MR | 2 | 2011 |
| CYANIDE | MR | 2 | 2011 |
| Fluoride | MR | 2 | 2011 |
| Mercury | MR | 2 | 2011 |
| Selenium | MR | 2 | 2011 |
| Antimony, Total | MR | 2 | 2011 |
Violation Count vs. the National Corpus
Sipaulovi (Lower Sipaulovi/Lower Mishongnovi) has 391 recorded EPA violations, 93% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 7% carry more. 32% of this system's own violations are health-based (124 of 391), and it ranks #25,974 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)
391 Higher than most more violations than 93% 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 Sipaulovi (Lower Sipaulovi/Lower Mishongnovi)
124 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for 090400107.
Sources: EPA SDWIS
Nationwide peers
391 violations · 609 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 smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Sipaulovi
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.