PlainWater
States → Navajo Nation

Non-Transient Non-Community Water System · PWS NN0400380

St Michael Indian School

St Michaels, Navajo Nation 86511 - drinking water served from groundwater sources to 585 people, tracked in EPA SDWIS and UCMR5.

585
People served
1,202
EPA violations
17
Health-based
Untested
UCMR5 result

The verdict

EPA records 1,202 drinking-water violations at St Michael Indian School, 1% of them health-based - above the Navajo Nation per-system average.

1,202
Total EPA violations on record
1%
Health-based (MCL / treatment failure)
585
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: St Michael Indian School

St Michael Indian School is a private-owned non-transient non-community water system that delivers drinking water to 585 residents in St Michaels, Navajo Nation through 38 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 1,202 total violations for this system , of which 17 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 1,110 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Revised Total Coliform Rule, recorded in 56 violations (MON). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Navajo Nation, EPA tracks 170 public water systems serving 167,275 people, with 29,535 cumulative violations and 1,366 health-based violations on record. About 100% of systems in the state carry at least one violation, and state-wide the average per system is 173.7 violations. Statewide, 13 of 13 UCMR5-tested systems have reported PFAS detections (100%).

St Michael Indian School's 1,202 violations sit above the Navajo Nation average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
585
Total Violations
1,202
Health-Based Violations
17
Water Source
Groundwater

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

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for St Michael Indian School.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID NN0400380 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Navajo Nation Drinking Water Authority

Navajo Nation's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find NN regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2025 Revised Total Coliform Rule MON 56 SDWIS / NN0400380 / 8000
2025 Public Notice Other 36 SDWIS / NN0400380 / 7500
2025 Revised Total Coliform Rule RPT 21 SDWIS / NN0400380 / 8000
2024 Nitrate MR 23 SDWIS / NN0400380 / 1040
2024 Nitrite MR 22 SDWIS / NN0400380 / 1041
2022 TTHM MR 33 SDWIS / NN0400380 / 2950
2022 Total Haloacetic Acids (HAA5) MR 32 SDWIS / NN0400380 / 2456
2021 Chlorine MR 3 SDWIS / NN0400380 / 0999
2016 Revised Total Coliform Rule Other 3 SDWIS / NN0400380 / 8000
2014 Coliform (TCR) MR 38 SDWIS / NN0400380 / 3100
2014 TTHM MCL 8 SDWIS / NN0400380 / 2950
2013 Endrin MR 16 SDWIS / NN0400380 / 2005
2013 BHC-GAMMA MR 16 SDWIS / NN0400380 / 2010
2013 Methoxychlor MR 16 SDWIS / NN0400380 / 2015
2013 Toxaphene MR 16 SDWIS / NN0400380 / 2020

How St Michael Indian School Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric St Michael Indian School Navajo Nation avg Federal benchmark
Total violations 1,202 173.7 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 17 8 Indicates a contaminant exceeded a federal MCL
PFAS detection None 100% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 585 984 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 170 regulated public water systems in Navajo Nation.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is St Michael Indian School water safe to drink? ▼
St Michael Indian School (PWS ID: NN0400380) has 1202 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 585 people using Groundwater sources.
How many people does St Michael Indian School serve? ▼
St Michael Indian School serves 585 people in St Michaels, Navajo Nation. It is a Private-owned system using Groundwater water sources with 38 service connections.
What type of violations does St Michael Indian School have? ▼
St Michael Indian School has 1,202 total violations: 17 health-based violations (MCL exceedances or treatment failures), 1,110 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in St Michael Indian School water? ▼
No PFAS testing data is available for St Michael Indian School under the EPA's UCMR5 monitoring program.
What water source does St Michael Indian School use? ▼
St Michael Indian School uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.