PlainWater
States → Navajo Nation

Tsaile-Dine College NTUA

PWS ID: NN0403005 · Ft Defiance, Navajo Nation 86504

Population Served
1,190
Total Violations
124
Health-Based Violations
3
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
348
School/Daycare
No
MCL Violations
3
Monitoring Violations
111
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

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
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.