Question 1

Is Iyanbito NTUA water safe to drink?

Accepted Answer

Iyanbito NTUA (PWS ID: NN3500258) has 146 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. EPA SDWIS lists this system's service population as 797 people using Groundwater sources.

Question 2

How many people does Iyanbito NTUA serve?

Accepted Answer

EPA SDWIS reports that Iyanbito NTUA serves 797 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 233 service connections. The operator address is listed in Ft Defiance, Navajo Nation.

Question 3

What type of violations does Iyanbito NTUA have?

Accepted Answer

Iyanbito NTUA has 146 total violations: 0 health-based violations (MCL exceedances or treatment failures), 133 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 Iyanbito NTUA water?

Accepted Answer

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

Question 5

What water source does Iyanbito NTUA use?

Accepted Answer

Iyanbito 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 Iyanbito NTUA sit among U.S. public water systems?

Accepted Answer

According to EPA SDWIS population_served among sitemap-advertised systems (serving 500+), Iyanbito NTUA ranks #22,763 of 29,740 by people served, and #59 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 Iyanbito NTUA's violation count compare nationally?

Accepted Answer

Iyanbito NTUA has 146 recorded EPA SDWIS violations, fewer than 19% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 81% of that cohort has fewer violations than Iyanbito 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
Nitrate	MR	7	2020
Nitrite	MR	7	2020
Coliform (TCR)	MR	6	2014
Barium	MR	3	2008
Cadmium	MR	3	2008
CYANIDE	MR	3	2008
Mercury	MR	3	2008
Antimony, Total	MR	3	2008
Beryllium, Total	MR	3	2008
TTHM	MR	3	2020
Thallium, Total	MR	3	2008
Chromium	MR	3	2008
Fluoride	MR	3	2008
Arsenic	MR	3	2008
Total Haloacetic Acids (HAA5)	MR	3	2020
Selenium	MR	3	2008
1,2,4-Trichlorobenzene	MR	2	2008
cis-1,2-Dichloroethylene	MR	2	2008
Xylenes, Total	MR	2	2008
DICHLOROMETHANE	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

Iyanbito NTUA

Iyanbito NTUA standing, high SDWIS violation third

System Details

Violation History

Violation Count vs. the National Corpus

Health-based violations on Iyanbito NTUA

Nationwide peers

Cross-state systems with comparable violation load

Cross-state systems with smaller service footprints