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Community Water System · PWS NN0436008

Greasewood Springs Community Boarding School BIA

Ganado, Navajo Nation 86505-9706 - drinking water served from groundwater sources to 720 people, tracked in EPA SDWIS and UCMR5.

720
People served
216
EPA violations
15
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 216 drinking-water violations at Greasewood Springs Community Boarding School BIA, 7% of them health-based - above the Navajo Nation per-system average.

216
Total EPA violations on record
7%
Health-based (MCL / treatment failure)
720
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Greasewood Springs Community Boarding School BIA

Greasewood Springs Community Boarding School BIA is a federal-owned community water system that delivers drinking water to 720 residents in Ganado, Navajo Nation through 81 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 216 total violations for this system , of which 15 (7%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 173 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 Barium, recorded in 13 violations (MCL, health-based). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

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%).

Greasewood Springs Community Boarding School BIA's 216 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
720
Total Violations
216
Health-Based Violations
15
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Federal
Connections
81
School/Daycare
Yes
MCL Violations
15
Monitoring Violations
173
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Barium MCL 13 2013
Coliform (TCR) MR 12 2012
Total Haloacetic Acids (HAA5) MR 10 2016
TTHM MR 8 2016
Barium MR 7 2024
Consumer Confidence Rule Other 6 2024
2,3,7,8-TCDD MR 6 2008
Nitrate MR 5 2024
Nitrite MR 5 2024
Fluoride MR 4 2008
Revised Total Coliform Rule MON 4 2025
Revised Total Coliform Rule RPT 4 2025
Revised Total Coliform Rule Other 3 2016
Public Notice Other 3 2025
Stage 2 Disinfectants and Disinfection Byproducts Rule MR 3 2013
Methoxychlor MR 2 2004
Toxaphene MR 2 2004
Dalapon MR 2 2004
Diquat MR 2 2004
Endothall MR 2 2004
OXAMYL MR 2 2004
Di(2-ethylhexyl) phthalate MR 2 2004
Hexachlorocyclopentadiene MR 2 2004
Aldicarb sulfoxide MR 2 2004
Carbofuran MR 2 2004
Aldicarb MR 2 2004
LASSO MR 2 2004
Heptachlor epoxide MR 2 2004
Benzo(a)pyrene MR 2 2004
1,2,4-Trichlorobenzene MR 2 2004

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 58 samples detected PFAS.

Contaminant Date Result MRL Status
NEtFOSAA 8/21/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 8/21/2023 <6.00 ppt 6.00 ppt Not Detected
PFTrDA 8/21/2023 <7.00 ppt 7.00 ppt Not Detected
PFTA 8/21/2023 <8.00 ppt 8.00 ppt Not Detected
11Cl-PF3OUdS 7/31/2023 <5.00 ppt 5.00 ppt Not Detected
PFUnA 7/31/2023 <2.00 ppt 2.00 ppt Not Detected
PFHxA 7/31/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 7/31/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 7/31/2023 <3.00 ppt 3.00 ppt Not Detected
PFOA 7/31/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 7/31/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpS 7/31/2023 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 7/31/2023 <2.00 ppt 2.00 ppt Not Detected
PFBS 7/31/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 7/31/2023 <4.00 ppt 4.00 ppt Not Detected
PFEESA 7/31/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 7/31/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 7/31/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 7/31/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 7/31/2023 <20.00 ppt 20.00 ppt Not Detected
ADONA 7/31/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 7/31/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 7/31/2023 <4.00 ppt 4.00 ppt Not Detected
PFMPA 7/31/2023 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 7/31/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 7/31/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 7/31/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 7/31/2023 <5.00 ppt 5.00 ppt Not Detected
HFPO-DA 7/31/2023 <5.00 ppt 5.00 ppt Not Detected
PFTA 2/21/2023 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 2/21/2023 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 2/21/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 2/21/2023 <6.00 ppt 6.00 ppt Not Detected
PFHxS 12/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 12/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 12/12/2023 <2.00 ppt 2.00 ppt Not Detected
PFNA 12/12/2023 <4.00 ppt 4.00 ppt Not Detected
11Cl-PF3OUdS 12/12/2023 <5.00 ppt 5.00 ppt Not Detected
PFHpA 12/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 12/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFOA 12/12/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeA 12/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFOS 12/12/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpS 12/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 12/12/2023 <4.00 ppt 4.00 ppt Not Detected
NFDHA 12/12/2023 <20.00 ppt 20.00 ppt Not Detected
PFMBA 12/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 12/12/2023 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 12/12/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 12/12/2023 <3.00 ppt 3.00 ppt Not Detected

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 Greasewood Springs Community 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 NN0436008 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 4 SDWIS / NN0436008 / 8000
2025 Revised Total Coliform Rule RPT 4 SDWIS / NN0436008 / 8000
2025 Public Notice Other 3 SDWIS / NN0436008 / 7500
2024 Barium MR 7 SDWIS / NN0436008 / 1010
2024 Consumer Confidence Rule Other 6 SDWIS / NN0436008 / 7000
2024 Nitrate MR 5 SDWIS / NN0436008 / 1040
2024 Nitrite MR 5 SDWIS / NN0436008 / 1041
2024 E. COLI MR 2 SDWIS / NN0436008 / 3014
2016 Total Haloacetic Acids (HAA5) MR 10 SDWIS / NN0436008 / 2456
2016 TTHM MR 8 SDWIS / NN0436008 / 2950
2016 Revised Total Coliform Rule Other 3 SDWIS / NN0436008 / 8000
2013 Barium MCL 13 SDWIS / NN0436008 / 1010
2013 Stage 2 Disinfectants and Disinfection Byproducts Rule MR 3 SDWIS / NN0436008 / 0600
2012 Coliform (TCR) MR 12 SDWIS / NN0436008 / 3100
2008 2,3,7,8-TCDD MR 6 SDWIS / NN0436008 / 2063

How Greasewood Springs Community Boarding School BIA Compares

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

Metric Greasewood Springs Community Boarding School BIA Navajo Nation avg Federal benchmark
Total violations 216 173.7 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 15 8 Indicates a contaminant exceeded a federal MCL
PFAS detection None 100% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 720 984 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 Greasewood Springs Community Boarding School BIA water safe to drink? ▼
Greasewood Springs Community Boarding School BIA (PWS ID: NN0436008) has 216 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 720 people using Groundwater sources.
How many people does Greasewood Springs Community Boarding School BIA serve? ▼
Greasewood Springs Community Boarding School BIA serves 720 people in Ganado, Navajo Nation. It is a Federal-owned system using Groundwater water sources with 81 service connections.
What type of violations does Greasewood Springs Community Boarding School BIA have? ▼
Greasewood Springs Community Boarding School BIA has 216 total violations: 15 health-based violations (MCL exceedances or treatment failures), 173 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Greasewood Springs Community Boarding School BIA water? ▼
No. Greasewood Springs Community Boarding School BIA was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Greasewood Springs Community Boarding School BIA use? ▼
Greasewood Springs Community 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. PFAS data from EPA UCMR5 monitoring program (2023-2025). 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.