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States → Navajo Nation

Community Water System · PWS NN0435006

Low Mountain Boarding School BIA

Pinon, Navajo Nation 86510 - drinking water served from groundwater sources to 339 people, tracked in EPA SDWIS and UCMR5.

339
People served
163
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 163 drinking-water violations at Low Mountain Boarding School BIA - below the Navajo Nation per-system average.

163
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
339
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Low Mountain Boarding School BIA

Low Mountain Boarding School BIA is a federal-owned community water system that delivers drinking water to 339 residents in Pinon, Navajo Nation through 20 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 163 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 142 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 Coliform (TCR), recorded in 8 violations (MR). 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%).

Low Mountain Boarding School BIA's 163 violations sit below 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
339
Total Violations
163
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Federal
Connections
20
School/Daycare
Yes
MCL Violations
0
Monitoring Violations
142
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 8 2013
Revised Total Coliform Rule RPT 7 2023
Total Haloacetic Acids (HAA5) MR 6 2022
Consumer Confidence Rule Other 5 2021
TTHM MR 4 2022
Nitrate MR 2 2010
Endrin MR 2 2008
Methoxychlor MR 2 2008
Toxaphene MR 2 2008
Dalapon MR 2 2008
Diquat MR 2 2008
Endothall MR 2 2008
Glyphosate MR 2 2008
Di(2-ethylhexyl) adipate MR 2 2008
OXAMYL MR 2 2008
Simazine MR 2 2008
Picloram MR 2 2008
Dinoseb MR 2 2008
Hexachlorocyclopentadiene MR 2 2008
Atrazine MR 2 2008
LASSO MR 2 2008
2,3,7,8-TCDD MR 2 2008
Heptachlor MR 2 2008
Heptachlor epoxide MR 2 2008
2,4-D MR 2 2008
2,4,5-TP MR 2 2008
HEXACHLOROBENZENE MR 2 2008
Benzo(a)pyrene MR 2 2008
Pentachlorophenol MR 2 2008
1,2,4-Trichlorobenzene MR 2 2008

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 Low Mountain Boarding School BIA.

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 NN0435006 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 1 SDWIS / NN0435006 / 8000
2023 Revised Total Coliform Rule RPT 7 SDWIS / NN0435006 / 8000
2022 Total Haloacetic Acids (HAA5) MR 6 SDWIS / NN0435006 / 2456
2022 TTHM MR 4 SDWIS / NN0435006 / 2950
2021 Consumer Confidence Rule Other 5 SDWIS / NN0435006 / 7000
2016 Revised Total Coliform Rule Other 2 SDWIS / NN0435006 / 8000
2013 Coliform (TCR) MR 8 SDWIS / NN0435006 / 3100
2013 Stage 2 Disinfectants and Disinfection Byproducts Rule MR 2 SDWIS / NN0435006 / 0600
2010 Nitrate MR 2 SDWIS / NN0435006 / 1040
2010 Nitrite MR 1 SDWIS / NN0435006 / 1041
2008 Endrin MR 2 SDWIS / NN0435006 / 2005
2008 Methoxychlor MR 2 SDWIS / NN0435006 / 2015
2008 Toxaphene MR 2 SDWIS / NN0435006 / 2020
2008 Dalapon MR 2 SDWIS / NN0435006 / 2031
2008 Diquat MR 2 SDWIS / NN0435006 / 2032

How Low Mountain Boarding School BIA Compares

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

Metric Low Mountain Boarding School BIA Navajo Nation avg Federal benchmark
Total violations 163 173.7 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 8 Indicates a contaminant exceeded a federal MCL
PFAS detection None 100% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 339 984 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 Low Mountain Boarding School BIA water safe to drink? ▼
Low Mountain Boarding School BIA (PWS ID: NN0435006) has 163 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 339 people using Groundwater sources.
How many people does Low Mountain Boarding School BIA serve? ▼
Low Mountain Boarding School BIA serves 339 people in Pinon, Navajo Nation. It is a Federal-owned system using Groundwater water sources with 20 service connections.
What type of violations does Low Mountain Boarding School BIA have? ▼
Low Mountain Boarding School BIA has 163 total violations: 0 health-based violations (MCL exceedances or treatment failures), 142 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Low Mountain Boarding School BIA water? ▼
No PFAS testing data is available for Low Mountain Boarding School BIA under the EPA's UCMR5 monitoring program.
What water source does Low Mountain Boarding School BIA use? ▼
Low Mountain Boarding School BIA uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
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.