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. EPA SDWIS lists this system's service population as 720 people using Groundwater sources.

How many people does Greasewood Springs Community Boarding School BIA serve?

EPA SDWIS reports that Greasewood Springs Community Boarding School BIA serves 720 people (this public water system's service population, not the municipal population of Ganado or any other city). It is a Federal-owned system using Groundwater water sources with 81 service connections. The operator address is listed in Ganado, Navajo Nation.

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.

Where does Greasewood Springs Community Boarding School BIA sit among U.S. public water systems?

According to EPA SDWIS population_served among sitemap-advertised systems (serving 500+), Greasewood Springs Community Boarding School BIA ranks #23,961 of 29,740 by people served, and #70 of 82 in Navajo Nation. Ordinals use population_served DESC among systems serving 500+ (the sitemap cohort). See /methodology#corpus-placement.

How does Greasewood Springs Community Boarding School BIA's violation count compare nationally?

Greasewood Springs Community Boarding School BIA has 216 recorded EPA SDWIS violations, fewer than 14% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 86% of that cohort has fewer violations than Greasewood Springs Community Boarding School BIA. A system can have zero recorded violations and still be actively monitored, and a high violation count often reflects a system that reports thoroughly, not necessarily one with worse water.

States → Navajo Nation

Community Water System · PWS NN0436008

Greasewood Springs Community Boarding School BIA

Operator location Ganado, Navajo Nation - smaller served population (≤ 999) at 720 people served; 216 SDWIS violations on record from groundwater sources.

Compiled by PlainWater · May 15, 2026

720
People served (this PWS) Smaller third of systems: 216
EPA violations (this PWS) Upper third of systems: 15
Health-based (this PWS) Middle third by health-based share: No PFAS
UCMR5 (this PWS) Tested, none detected

Follow published updates (RSS)

Greasewood Springs Community Boarding School BIA standing, high SDWIS violation third

720 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 7% is middle-third health share (≤ 23%). UCMR5: UCMR5 tested, none detected. Population rank #23,961 of 29,740 among systems serving 500+.

The verdict

Greasewood Springs Community Boarding School BIA sits in the upper third of the sitemap cohort by violation count (216), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (720; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 7% (middle-third health share (≤ 23%)). UCMR5 tested this system and reported no PFAS above the minimum reporting level.

#23,961 of 29,740
Population · /systems: #70 of 82
Population · NN: 216
Total EPA violations on record: 7%
Health-based (MCL / treatment failure)

Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.

Water Safety Score

13/100

Greasewood Springs Community Boarding School BIA

Based on EPA SDWIS violation history and UCMR5 PFAS testing only, not water taste, odor, infrastructure age, or contaminants outside the federally tracked set.

Health-based violations F

EPA SDWIS health-based violations on record (MCL, MRDL, treatment technique)

Monitoring & reporting violations F

201

Non-health SDWIS violations (monitoring, reporting, and other compliance)

PFAS contamination N/A

Tested, none detected

Highest PFAS compound level detected in UCMR5 testing

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

Violation Count vs. the National Corpus

Greasewood Springs Community Boarding School BIA has 216 recorded EPA violations, 86% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 14% carry more. 7% of this system's own violations are health-based (15 of 216), and it ranks #23,961 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)

216 Higher than most more violations than 86% 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

Greasewood Springs Community Boarding School BIA 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.

30 public water systems (500+ people served), EPA SDWIS current release.

How to read this

Each dot is one public water system; the highlighted dot is Greasewood Springs Community Boarding School BIA. A system to the right has more recorded violations; a system higher up has a larger share of those violations classified health-based rather than monitoring or reporting.

Rare but serious: few violations, but most of them are health-based.
Frequent, mostly paperwork: many violations, but mostly monitoring or reporting, not health-based.
Clean record: below-median on both counts, the tinted corner.

View all 30 systems as a list

City of Ballinger: 372 violations, 85% health-based
Nooksack Valley Water Association: 16 violations, 31% health-based
Montgomery Co RWD 12: 7 violations, 29% health-based
Irvin Water District #6: 11 violations, 27% health-based
Ticonderoga WD: 47 violations, 26% health-based
Pine Valley Plantation: 37 violations, 24% health-based
McLouth, City Of: 29 violations, 17% health-based
Kipling Oaks 1: 25 violations, 16% health-based
South Deerfield Water Supply District: 96 violations, 16% health-based
Sunset Ridge Water District: 82 violations, 15% health-based
Orange Water Dept: 136 violations, 14% health-based
Mount Pleasant Water Sys #1: 167 violations, 11% health-based
Greasewood Springs Community Boarding School BIA: 216 violations, 7% health-based (this system)
Lake Gibson Estates: 42 violations, 2% health-based
Benson Culinary Improvement District: 212 violations, 1% health-based
Conemaugh Twp Muni Auth: 567 violations, 1% health-based
Miccosukee Service Plaza: 0 violations, 0% health-based
Brazoria - Fort Bend Counties MUD 3: 0 violations, 0% health-based
Tanglewilde Thompson Place 600: 2 violations, 0% health-based
Center Water Co: 5 violations, 0% health-based
Spring Mills Elem School/Hvs: 9 violations, 0% health-based
Great Bend Industrial Park: 14 violations, 0% health-based
Glen Park Village: 19 violations, 0% health-based
Camp Is-Sho-Da: 22 violations, 0% health-based
Hamilton: 33 violations, 0% health-based
Town of Welaka: 54 violations, 0% health-based
Township of Blairstown Dpw: 61 violations, 0% health-based
McIntosh Water & Fire Pro Authority: 71 violations, 0% health-based
Clarkdale Municipal Water System: 114 violations, 0% health-based
Eureka Water Association: 273 violations, 0% health-based

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

Population served record for Greasewood Springs Community Boarding School BIA

EPA SDWIS lists 720 people served and 81 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.

EPA SDWIS · PWS NN0436008

Sources: EPA SDWIS

Nationwide peers

216 violations · 720 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.

4 peers

Cross-state systems with smaller service footprints

Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).

4 peers

What to do with Greasewood Springs Community Boarding School B…

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.

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

Compiled by PlainWater, Drinking Water Quality Editorial Process · May 15, 2026

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.