Question 1

Is Sweetwater NTUA water safe to drink?

Accepted Answer

Sweetwater NTUA (PWS ID: NN0400399) has 156 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. EPA SDWIS lists this system's service population as 2,014 people using Surface Water sources.

Question 2

How many people does Sweetwater NTUA serve?

Accepted Answer

EPA SDWIS reports that Sweetwater NTUA serves 2,014 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 589 service connections. The operator address is listed in Ft Defiance, Navajo Nation.

Question 3

What type of violations does Sweetwater NTUA have?

Accepted Answer

Sweetwater NTUA has 156 total violations: 44 health-based violations (MCL exceedances or treatment failures), 68 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 Sweetwater NTUA water?

Accepted Answer

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

Question 5

What water source does Sweetwater NTUA use?

Accepted Answer

Sweetwater 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

Where does Sweetwater NTUA sit among U.S. public water systems?

Accepted Answer

According to EPA SDWIS population_served among sitemap-advertised systems (serving 500+), Sweetwater NTUA ranks #13,479 of 29,740 by people served, and #14 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 Sweetwater NTUA's violation count compare nationally?

Accepted Answer

Sweetwater NTUA has 156 recorded EPA SDWIS violations, fewer than 18% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 82% of that cohort has fewer violations than Sweetwater 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	37	2025
Public Notice	Other	23	2024
Arsenic	MR	8	2022
Coliform (TCR)	MCL	4	2015
Coliform (TCR)	MR	4	2012
Total Polychlorinated Biphenyls (PCB)	MR	3	2008
TTHM	MCL	3	2020
1,2-DIBROMO-3-CHLOROPROPANE	MR	3	2008
Stage 2 Disinfectants and Disinfection Byproducts Rule	MR	3	2013
ETHYLENE DIBROMIDE	MR	3	2008
1,2,4-Trichlorobenzene	MR	2	2008
Xylenes, Total	MR	2	2008
DICHLOROMETHANE	MR	2	2008
o-Dichlorobenzene	MR	2	2008
p-Dichlorobenzene	MR	2	2008
Vinyl chloride	MR	2	2008
1,1-Dichloroethylene	MR	2	2008
trans-1,2-Dichloroethylene	MR	2	2008
1,2-Dichloroethane	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
CHLOROBENZENE	MR	2	2008
Benzene	MR	2	2008
Toluene	MR	2	2008
Ethylbenzene	MR	2	2008
Styrene	MR	2	2008
Tetrachloroethylene	MR	2	2008

Sweetwater NTUA

Sweetwater NTUA standing, high SDWIS violation third

System Details

Violation History

Violation Count vs. the National Corpus

Health-based violations on Sweetwater NTUA

Nationwide peers

Cross-state systems with comparable violation load

Cross-state systems near this population served