Question 1

Is Tsaile-Dine College NTUA water safe to drink?

Accepted Answer

Tsaile-Dine College NTUA (PWS ID: NN0403005) has 124 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. EPA SDWIS lists this system's service population as 1,190 people using Groundwater sources.

Question 2

How many people does Tsaile-Dine College NTUA serve?

Accepted Answer

EPA SDWIS reports that Tsaile-Dine College NTUA serves 1,190 people (this public water system's service population, not the municipal population of Ft Defiance or any other city). It is a Native American-owned system using Groundwater water sources with 348 service connections. The operator address is listed in Ft Defiance, Navajo Nation.

Question 3

What type of violations does Tsaile-Dine College NTUA have?

Accepted Answer

Tsaile-Dine College NTUA has 124 total violations: 3 health-based violations (MCL exceedances or treatment failures), 111 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Question 4

Has PFAS been detected in Tsaile-Dine College NTUA water?

Accepted Answer

No PFAS testing data is available for Tsaile-Dine College NTUA under the EPA's UCMR5 monitoring program.

Question 5

What water source does Tsaile-Dine College NTUA use?

Accepted Answer

Tsaile-Dine College NTUA uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.

Question 6

Where does this data come from?

Accepted Answer

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.

Question 7

Where does Tsaile-Dine College NTUA sit among U.S. public water systems?

Accepted Answer

According to EPA SDWIS population_served among sitemap-advertised systems (serving 500+), Tsaile-Dine College NTUA ranks #18,022 of 29,740 by people served, and #32 of 82 in Navajo Nation. Ordinals use population_served DESC among systems serving 500+ (the sitemap cohort). See /methodology#corpus-placement.

Question 8

How does Tsaile-Dine College NTUA's violation count compare nationally?

Accepted Answer

Tsaile-Dine College NTUA has 124 recorded EPA SDWIS violations, fewer than 22% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 77% of that cohort has fewer violations than Tsaile-Dine College NTUA. 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.

Contaminant	Category	Count	Latest
Coliform (TCR)	MR	6	2012
Total Haloacetic Acids (HAA5)	MR	6	2020
TTHM	MR	6	2020
Arsenic	MR	4	2018
Combined Radium (-226 and -228)	MR	3	2015
Arsenic	MCL	3	2014
1,2,4-Trichlorobenzene	MR	2	2008
cis-1,2-Dichloroethylene	MR	2	2008
DICHLOROMETHANE	MR	2	2008
p-Dichlorobenzene	MR	2	2008
1,1-Dichloroethylene	MR	2	2008
trans-1,2-Dichloroethylene	MR	2	2008
1,2-Dichloroethane	MR	2	2008
Carbon tetrachloride	MR	2	2008
1,2-Dichloropropane	MR	2	2008
Trichloroethylene	MR	2	2008
1,1,2-Trichloroethane	MR	2	2008
Tetrachloroethylene	MR	2	2008
CHLOROBENZENE	MR	2	2008
Benzene	MR	2	2008
Toluene	MR	2	2008
Ethylbenzene	MR	2	2008
Styrene	MR	2	2008
Public Notice	Other	2	2014
1,1,1-Trichloroethane	MR	2	2008
Stage 2 Disinfectants and Disinfection Byproducts Rule	MR	2	2013
o-Dichlorobenzene	MR	2	2008
Revised Total Coliform Rule	Other	2	2016
Xylenes, Total	MR	2	2008
Vinyl chloride	MR	2	2008

Tsaile-Dine College NTUA

Tsaile-Dine College NTUA standing, high SDWIS violation third

System Details

Violation History

Violation Count vs. the National Corpus

SDWIS compliance record for Tsaile-Dine College NTUA

Nationwide peers

Cross-state systems with comparable violation load

Cross-state systems near this population served