PlainWater
States → Navajo Nation

Hard Rock NTUA

PWS ID: NN0403811 · Ft Defiance, Navajo Nation 86504

Population Served
982
Total Violations
74
Health-Based Violations
3
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
287
School/Daycare
No
MCL Violations
3
Monitoring Violations
66
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 3 2003
Total Haloacetic Acids (HAA5) MR 3 2020
TTHM MR 3 2020
Stage 2 Disinfectants and Disinfection Byproducts Rule MR 3 2013
1,2,4-Trichlorobenzene MR 2 2008
Xylenes, Total MR 2 2008
o-Dichlorobenzene MR 2 2008
Vinyl chloride MR 2 2008
1,1-Dichloroethylene MR 2 2008
trans-1,2-Dichloroethylene MR 2 2008
1,1,1-Trichloroethane 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
Toluene MR 2 2008
Ethylbenzene MR 2 2008
Styrene MR 2 2008
Coliform (TCR) MR 2 2012
cis-1,2-Dichloroethylene MR 2 2008
DICHLOROMETHANE MR 2 2008
p-Dichlorobenzene MR 2 2008
Benzene MR 2 2008
1,2-Dichloroethane MR 2 2008
Barium MR 1 2008
CYANIDE MR 1 2008
Fluoride MR 1 2008
Mercury MR 1 2008
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.