Question 1

Is Naschitti-Bisola NTUA water safe to drink?

Accepted Answer

Naschitti-Bisola NTUA (PWS ID: NN3500268) has 105 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. EPA SDWIS lists this system's service population as 1,173 people using Groundwater sources.

Question 2

How many people does Naschitti-Bisola NTUA serve?

Accepted Answer

EPA SDWIS reports that Naschitti-Bisola NTUA serves 1,173 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 343 service connections. The operator address is listed in Ft Defiance, Navajo Nation.

Question 3

What type of violations does Naschitti-Bisola NTUA have?

Accepted Answer

Naschitti-Bisola NTUA has 105 total violations: 0 health-based violations (MCL exceedances or treatment failures), 96 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 Naschitti-Bisola NTUA water?

Accepted Answer

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

Question 5

What water source does Naschitti-Bisola NTUA use?

Accepted Answer

Naschitti-Bisola 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 Naschitti-Bisola NTUA sit among U.S. public water systems?

Accepted Answer

According to EPA SDWIS population_served among sitemap-advertised systems (serving 500+), Naschitti-Bisola NTUA ranks #18,119 of 29,740 by people served, and #33 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 Naschitti-Bisola NTUA's violation count compare nationally?

Accepted Answer

Naschitti-Bisola NTUA has 105 recorded EPA SDWIS violations, fewer than 26% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 74% of that cohort has fewer violations than Naschitti-Bisola 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	3	2012
Total Haloacetic Acids (HAA5)	MR	3	2020
TTHM	MR	3	2020
Stage 2 Disinfectants and Disinfection Byproducts Rule	MR	3	2013
cis-1,2-Dichloroethylene	MR	2	2008
Xylenes, Total	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
1,1,1-Trichloroethane	MR	2	2008
Carbon tetrachloride	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
Styrene	MR	2	2008
1,2,4-Trichlorobenzene	MR	2	2008
DICHLOROMETHANE	MR	2	2008
Trichloroethylene	MR	2	2008
1,2-Dichloroethane	MR	2	2008
Ethylbenzene	MR	2	2008
Revised Total Coliform Rule	Other	2	2016
1,2-Dichloropropane	MR	2	2008
Cadmium	MR	1	2008
Chromium	MR	1	2008
CYANIDE	MR	1	2008
Mercury	MR	1	2008

Naschitti-Bisola NTUA

Naschitti-Bisola NTUA standing, high SDWIS violation third

System Details

Violation History

Violation Count vs. the National Corpus

Health-based violations on Naschitti-Bisola NTUA

Nationwide peers

Cross-state systems with comparable violation load

Cross-state systems near this population served