Non-Transient Non-Community Water System · PWS NN0400380
St Michael Indian School
Operator location St Michaels, Navajo Nation - smaller served population (≤ 999) at 585 people served; 1,202 SDWIS violations on record from groundwater sources.
- 585
- People served (this PWS) Smaller third of systems
- 1,202
- EPA violations (this PWS) Upper third of systems
- 17
- Health-based (this PWS) Middle third by health-based share
- Untested
- UCMR5 (this PWS) No UCMR5 result
St Michael Indian School standing, high SDWIS violation third
585 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 1% is middle-third health share (≤ 23%). Population rank #26,803 of 29,740 among systems serving 500+.
The verdict
St Michael Indian School sits in the upper third of the sitemap cohort by violation count (1,202), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (585; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 1% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #26,803 of 29,740
- Population · /systems
- #78 of 82
- Population · NN
- 1,202
- Total EPA violations on record
- 1%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
Based on EPA SDWIS violation history and UCMR5 PFAS testing only, not water taste, odor, infrastructure age, or contaminants outside the federally tracked set.
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Private
- Connections
- 38
- School/Daycare
- Yes
- MCL Violations
- 17
- Monitoring Violations
- 1,110
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Revised Total Coliform Rule | MON | 56 | 2025 |
| Coliform (TCR) | MR | 38 | 2014 |
| Public Notice | Other | 36 | 2025 |
| TTHM | MR | 33 | 2022 |
| Total Haloacetic Acids (HAA5) | MR | 32 | 2022 |
| Nitrate | MR | 23 | 2024 |
| Nitrite | MR | 22 | 2024 |
| Revised Total Coliform Rule | RPT | 21 | 2025 |
| Endrin | MR | 16 | 2013 |
| BHC-GAMMA | MR | 16 | 2013 |
| Methoxychlor | MR | 16 | 2013 |
| Toxaphene | MR | 16 | 2013 |
| Dalapon | MR | 16 | 2013 |
| Diquat | MR | 16 | 2013 |
| Endothall | MR | 16 | 2013 |
| Glyphosate | MR | 16 | 2013 |
| Di(2-ethylhexyl) adipate | MR | 16 | 2013 |
| OXAMYL | MR | 16 | 2013 |
| Simazine | MR | 16 | 2013 |
| Di(2-ethylhexyl) phthalate | MR | 16 | 2013 |
| Picloram | MR | 16 | 2013 |
| Dinoseb | MR | 16 | 2013 |
| Hexachlorocyclopentadiene | MR | 16 | 2013 |
| Carbofuran | MR | 16 | 2013 |
| Atrazine | MR | 16 | 2013 |
| LASSO | MR | 16 | 2013 |
| 2,3,7,8-TCDD | MR | 16 | 2013 |
| Heptachlor | MR | 16 | 2013 |
| Heptachlor epoxide | MR | 16 | 2013 |
| 2,4-D | MR | 16 | 2013 |
Violation Count vs. the National Corpus
St Michael Indian School has 1,202 recorded EPA violations, 99% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 1% carry more. 1% of this system's own violations are health-based (17 of 1,202), and it ranks #26,803 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)
1,202 Higher than most more violations than 99% 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
How many violations vs. how serious, among peer systems
St Michael Indian School plotted against 29 peer public water systems (500+ people served), by total violation count (x) and the share of those violations that are health-based (y). The crosshair sits at this sample's own median on each axis. A high violation count does not automatically mean a serious record: most monitoring and reporting violations are minor, not health-based.
Violation volume vs. health-based share
Population served record for St Michael Indian School
EPA SDWIS lists 585 people served and 38 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
1,202 violations · 585 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 St Michael Indian School
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Navajo Nation compares on the same EPA violation measures. Navajo Nation 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.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.