Question 1

Is Casamero Lake-Smith Lake NTUA water safe to drink?

Accepted Answer

Casamero Lake-Smith Lake NTUA (PWS ID: NN3500256) has 202 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. EPA SDWIS lists this system's service population as 906 people using Groundwater sources.

Question 2

How many people does Casamero Lake-Smith Lake NTUA serve?

Accepted Answer

EPA SDWIS reports that Casamero Lake-Smith Lake NTUA serves 906 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 265 service connections. The operator address is listed in Ft Defiance, Navajo Nation.

Question 3

What type of violations does Casamero Lake-Smith Lake NTUA have?

Accepted Answer

Casamero Lake-Smith Lake NTUA has 202 total violations: 5 health-based violations (MCL exceedances or treatment failures), 174 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 Casamero Lake-Smith Lake NTUA water?

Accepted Answer

No PFAS testing data is available for Casamero Lake-Smith Lake NTUA under the EPA's UCMR5 monitoring program.

Question 5

What water source does Casamero Lake-Smith Lake NTUA use?

Accepted Answer

Casamero Lake-Smith Lake 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 Casamero Lake-Smith Lake NTUA sit among U.S. public water systems?

Accepted Answer

According to EPA SDWIS population_served among sitemap-advertised systems (serving 500+), Casamero Lake-Smith Lake NTUA ranks #20,889 of 29,740 by people served, and #50 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 Casamero Lake-Smith Lake NTUA's violation count compare nationally?

Accepted Answer

Casamero Lake-Smith Lake NTUA has 202 recorded EPA SDWIS violations, fewer than 14% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 85% of that cohort has fewer violations than Casamero Lake-Smith Lake 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
Diquat	MR	15	2014
Endothall	MR	15	2014
Glyphosate	MR	15	2014
2,3,7,8-TCDD	MR	15	2014
Coliform (TCR)	MR	8	2014
Coliform (TCR)	MCL	5	2014
Nitrate	MR	3	2010
Endrin	MR	2	2012
Methoxychlor	MR	2	2012
Toxaphene	MR	2	2012
Dalapon	MR	2	2012
Di(2-ethylhexyl) adipate	MR	2	2012
OXAMYL	MR	2	2012
Simazine	MR	2	2012
Di(2-ethylhexyl) phthalate	MR	2	2012
Dinoseb	MR	2	2012
Carbofuran	MR	2	2012
LASSO	MR	2	2012
Heptachlor	MR	2	2012
Heptachlor epoxide	MR	2	2012
2,4-D	MR	2	2012
Benzo(a)pyrene	MR	2	2012
Pentachlorophenol	MR	2	2012
1,2,4-Trichlorobenzene	MR	2	2012
cis-1,2-Dichloroethylene	MR	2	2012
Total Polychlorinated Biphenyls (PCB)	MR	2	2012
1,2-DIBROMO-3-CHLOROPROPANE	MR	2	2012
DICHLOROMETHANE	MR	2	2012
o-Dichlorobenzene	MR	2	2012
p-Dichlorobenzene	MR	2	2012

Casamero Lake-Smith Lake NTUA

Casamero Lake-Smith Lake NTUA standing, high SDWIS violation third

System Details

Violation History

Violation Count vs. the National Corpus

Population served record for Casamero Lake-Smith Lake NTUA

Nationwide peers

Cross-state systems with comparable violation load

Cross-state systems with smaller service footprints