Question 1

Is Ojo Encino North NTUA water safe to drink?

Accepted Answer

Ojo Encino North NTUA (PWS ID: NN3503041) has 92 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. EPA SDWIS lists this system's service population as 1,108 people using Surface Water sources.

Question 2

How many people does Ojo Encino North NTUA serve?

Accepted Answer

EPA SDWIS reports that Ojo Encino North NTUA serves 1,108 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 324 service connections. The operator address is listed in Ft Defiance, Navajo Nation.

Question 3

What type of violations does Ojo Encino North NTUA have?

Accepted Answer

Ojo Encino North NTUA has 92 total violations: 0 health-based violations (MCL exceedances or treatment failures), 80 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 Ojo Encino North NTUA water?

Accepted Answer

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

Question 5

What water source does Ojo Encino North NTUA use?

Accepted Answer

Ojo Encino North 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 Ojo Encino North NTUA sit among U.S. public water systems?

Accepted Answer

According to EPA SDWIS population_served among sitemap-advertised systems (serving 500+), Ojo Encino North NTUA ranks #18,513 of 29,740 by people served, and #39 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 Ojo Encino North NTUA's violation count compare nationally?

Accepted Answer

Ojo Encino North NTUA has 92 recorded EPA SDWIS violations, fewer than 28% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 71% of that cohort has fewer violations than Ojo Encino North 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	9	2012
E. COLI	MR	3	2011
Stage 2 Disinfectants and Disinfection Byproducts Rule	MR	2	2013
Arsenic	MR	1	2008
Barium	MR	1	2008
Cadmium	MR	1	2008
Chromium	MR	1	2008
CYANIDE	MR	1	2008
Fluoride	MR	1	2008
Nitrite	MR	1	2010
Selenium	MR	1	2008
Antimony, Total	MR	1	2008
Thallium, Total	MR	1	2008
Endrin	MR	1	2008
Methoxychlor	MR	1	2008
Endothall	MR	1	2008
Glyphosate	MR	1	2008
OXAMYL	MR	1	2008
Picloram	MR	1	2008
LASSO	MR	1	2008
Hexachlorocyclopentadiene	MR	1	2008
Atrazine	MR	1	2008
2,3,7,8-TCDD	MR	1	2008
Heptachlor	MR	1	2008
2,4-D	MR	1	2008
2,4,5-TP	MR	1	2008
Benzo(a)pyrene	MR	1	2008
Pentachlorophenol	MR	1	2008
1,2,4-Trichlorobenzene	MR	1	2008
ETHYLENE DIBROMIDE	MR	1	2008

Ojo Encino North NTUA

Ojo Encino North NTUA standing, high SDWIS violation third

System Details

Violation History

Violation Count vs. the National Corpus

Health-based violations on Ojo Encino North NTUA

Nationwide peers

Cross-state systems with comparable violation load

Cross-state systems near this population served