Question 1

Is Mexican Water NTUA water safe to drink?

Accepted Answer

Mexican Water NTUA (PWS ID: NN4903072) has 141 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. EPA SDWIS lists this system's service population as 294 people using Surface Water sources.

Question 2

How many people does Mexican Water NTUA serve?

Accepted Answer

EPA SDWIS reports that Mexican Water NTUA serves 294 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 Surface Water water sources with 86 service connections. The operator address is listed in Ft Defiance, Navajo Nation.

Question 3

What type of violations does Mexican Water NTUA have?

Accepted Answer

Mexican Water NTUA has 141 total violations: 36 health-based violations (MCL exceedances or treatment failures), 62 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 Mexican Water NTUA water?

Accepted Answer

No PFAS testing data is available for Mexican Water NTUA under the EPA's UCMR5 monitoring program.

Question 5

What water source does Mexican Water NTUA use?

Accepted Answer

Mexican Water NTUA uses Surface Water 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

How does Mexican Water NTUA's violation count compare nationally?

Accepted Answer

Mexican Water NTUA has 141 recorded EPA SDWIS violations, fewer than 20% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 80% of that cohort has fewer violations than Mexican Water 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
Arsenic	MCL	36	2024
Public Notice	Other	15	2024
Arsenic	MR	5	2022
Coliform (TCR)	MR	3	2012
Stage 2 Disinfectants and Disinfection Byproducts Rule	MR	3	2013
CYANIDE	MR	3	2008
1,2-DIBROMO-3-CHLOROPROPANE	MR	2	2011
ETHYLENE DIBROMIDE	MR	2	2011
Xylenes, Total	MR	2	2011
Vinyl chloride	MR	2	2011
1,2-Dichloroethane	MR	2	2011
Carbon tetrachloride	MR	2	2011
1,1,2-Trichloroethane	MR	2	2011
CHLOROBENZENE	MR	2	2011
Benzene	MR	2	2011
Styrene	MR	2	2011
Revised Total Coliform Rule	Other	2	2016
cis-1,2-Dichloroethylene	MR	2	2011
Trichloroethylene	MR	2	2011
1,1-Dichloroethylene	MR	2	2011
DICHLOROMETHANE	MR	2	2011
Ethylbenzene	MR	2	2011
1,1,1-Trichloroethane	MR	2	2011
p-Dichlorobenzene	MR	2	2011
1,2,4-Trichlorobenzene	MR	2	2011
1,2-Dichloropropane	MR	2	2011
Toluene	MR	2	2011
trans-1,2-Dichloroethylene	MR	2	2011
Tetrachloroethylene	MR	2	2011
o-Dichlorobenzene	MR	2	2011

Mexican Water NTUA

Mexican Water NTUA standing, high SDWIS violation third

System Details

Violation History

Violation Count vs. the National Corpus

Health-based violations on Mexican Water NTUA

Nationwide peers

Cross-state systems with comparable violation load