Ft Defiance, NN

Whitehorse Lake NTUA Water System

Current status

2 items on record are open and awaiting resolution as of July 4, 2026. None are health-based violations — open items of this kind are most often monitoring or reporting requirements, not water-safety findings. Full details are in the violation history below.

This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 2026. This is a record-keeping and public-information tool — it does not replace Navajo Nation’s official records. Always confirm current status with Navajo Nation before making decisions based on this information.

System facts

System ID (PWSID): NN3500239
System type: Community Water System
Population served: 277
Service connections: 81
Ownership: Native American tribal
Water source: surface water (rivers, lakes, or reservoirs)

Violation history

Sample Siting Plan Errors (RTCR)
—
Revised Total Coliform Rule
April 1, 2016
Unaddressed
Monitoring, Regular
—
2,3,7,8-TCDD
October 1, 2014 – December 31, 2014
Resolved
Monitoring, Regular
—
Diquat
October 1, 2014 – December 31, 2014
Resolved
Monitoring, Regular
—
Endothall
October 1, 2014 – December 31, 2014
Resolved
Monitoring, Regular
—
Glyphosate
October 1, 2014 – December 31, 2014
Resolved
Failure Submit IDSE/Subpart V Plan Rpt
—
Stage 2 Disinfectants and Disinfection Byproducts Rule
October 1, 2013
Unaddressed
Monitoring, Regular
—
Nitrite
July 1, 2013 – September 30, 2013
Resolved
Monitoring, Regular
—
Nitrate
July 1, 2013 – September 30, 2013
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
December 1, 2012 – December 31, 2012
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
November 1, 2012 – November 30, 2012
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Antimony, Total
October 1, 2010 – December 31, 2010
Resolved
Monitoring, Regular
—
Nitrite
January 1, 2010 – December 31, 2010
Resolved
Monitoring, Regular
—
Total Polychlorinated Biphenyls (PCB)
January 1, 2008 – March 24, 2009
Resolved
Monitoring, Regular
—
1,2-DIBROMO-3-CHLOROPROPANE
January 1, 2008 – December 31, 2010
Resolved
Monitoring, Regular
—
ETHYLENE DIBROMIDE
January 1, 2008 – December 31, 2010
Resolved
Monitoring, Regular
—
Fluoride
January 1, 2008 – December 31, 2010
Resolved
Monitoring, Regular
—
Mercury
January 1, 2008 – September 10, 2008
Resolved
Monitoring, Regular
—
Thallium, Total
January 1, 2008 – December 31, 2010
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
January 1, 2005 – December 31, 2010
Resolved
Monitoring, Regular
—
Combined Uranium
January 1, 2005 – December 31, 2010
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
January 1, 2005 – December 31, 2010
Resolved
Maximum Contaminant Level Violation, Single Sample
Health-based
Antimony, Total
June 21, 2000 – June 20, 2001
Resolved

Unaddressed no corrective action on record yetResolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
April 1, 2016	Sample Siting Plan Errors (RTCR)	Revised Total Coliform Rule	—	Unaddressed
October 1, 2014 – December 31, 2014	Monitoring, Regular	2,3,7,8-TCDD	—	Resolved
October 1, 2014 – December 31, 2014	Monitoring, Regular	Diquat	—	Resolved
October 1, 2014 – December 31, 2014	Monitoring, Regular	Endothall	—	Resolved
October 1, 2014 – December 31, 2014	Monitoring, Regular	Glyphosate	—	Resolved
October 1, 2013	Failure Submit IDSE/Subpart V Plan Rpt	Stage 2 Disinfectants and Disinfection Byproducts Rule	—	Unaddressed
July 1, 2013 – September 30, 2013	Monitoring, Regular	Nitrite	—	Resolved
July 1, 2013 – September 30, 2013	Monitoring, Regular	Nitrate	—	Resolved
December 1, 2012 – December 31, 2012	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
November 1, 2012 – November 30, 2012	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
October 1, 2010 – December 31, 2010	Maximum Contaminant Level Violation, Average	Antimony, Total	Health-based	Resolved
January 1, 2010 – December 31, 2010	Monitoring, Regular	Nitrite	—	Resolved
January 1, 2008 – March 24, 2009	Monitoring, Regular	Total Polychlorinated Biphenyls (PCB)	—	Resolved
January 1, 2008 – December 31, 2010	Monitoring, Regular	1,2-DIBROMO-3-CHLOROPROPANE	—	Resolved
January 1, 2008 – December 31, 2010	Monitoring, Regular	ETHYLENE DIBROMIDE	—	Resolved
January 1, 2008 – December 31, 2010	Monitoring, Regular	Fluoride	—	Resolved
January 1, 2008 – September 10, 2008	Monitoring, Regular	Mercury	—	Resolved
January 1, 2008 – December 31, 2010	Monitoring, Regular	Thallium, Total	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	Combined Uranium	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
June 21, 2000 – June 20, 2001	Maximum Contaminant Level Violation, Single Sample	Antimony, Total	Health-based	Resolved

Unaddressed no corrective action on record yetResolved addressed and confirmed by the state

Enforcement actions

April 30, 2025State Formal Notice of Violation issuedgeneral compliance action — not tied to a specific violation on record
April 30, 2025State Formal Notice of Violation issuedgeneral compliance action — not tied to a specific violation on record
August 28, 2024State Formal Notice of Violation issued1 linked violation
April 12, 2022State Compliance achievedgeneral compliance action — not tied to a specific violation on record
March 31, 2021State Public Notification issuedgeneral compliance action — not tied to a specific violation on record
March 31, 2021State Formal Notice of Violation issuedgeneral compliance action — not tied to a specific violation on record
August 28, 2017State Public Notification issued1 linked violation
August 28, 2017State Formal Notice of Violation issued1 linked violation
March 10, 2015State Compliance achieved1 linked violation
March 10, 2015State Compliance achieved1 linked violation
March 10, 2015State Compliance achieved1 linked violation
March 10, 2015State Compliance achieved1 linked violation
March 5, 2015State Formal Notice of Violation issued1 linked violation
March 5, 2015State Public Notification requested1 linked violation
March 5, 2015State Formal Notice of Violation issued1 linked violation
March 5, 2015State Formal Notice of Violation issued1 linked violation
March 5, 2015State Formal Notice of Violation issued1 linked violation
March 5, 2015State Public Notification requested1 linked violation
March 5, 2015State Public Notification requested1 linked violation
March 5, 2015State Public Notification requested1 linked violation
April 24, 2014State Formal Notice of Violation issued1 linked violation
April 24, 2014State Formal Notice of Violation issued1 linked violation
April 24, 2014State Public Notification issued1 linked violation
April 24, 2014State Public Notification issued1 linked violation
October 29, 2013State Compliance achieved1 linked violation
October 29, 2013State Compliance achieved1 linked violation
January 11, 2013State Formal Notice of Violation issued1 linked violation
January 11, 2013State Compliance achieved1 linked violation
December 11, 2012State Compliance achieved1 linked violation
November 2, 2012State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
November 2, 2012State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
November 2, 2012State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
November 2, 2012State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
November 2, 2012State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
August 7, 2012State Compliance achieved1 linked violation
August 7, 2012State Compliance achieved1 linked violation
February 21, 2012State Compliance achieved1 linked violation
February 21, 2012State Other1 linked violation
November 17, 2011State Formal Notice of Violation issued1 linked violation
November 17, 2011State Formal Notice of Violation issued1 linked violation
November 17, 2011State Public Notification issued1 linked violation
November 17, 2011State Public Notification issued1 linked violation
November 17, 2011State Public Notification issued1 linked violation
November 17, 2011State Formal Notice of Violation issued1 linked violation
November 17, 2011State Formal Notice of Violation issued1 linked violation
November 17, 2011State Formal Notice of Violation issued1 linked violation
November 17, 2011State Formal Notice of Violation issued1 linked violation
November 17, 2011State Public Notification issued1 linked violation
November 17, 2011State Public Notification issued1 linked violation
November 17, 2011State Compliance achieved1 linked violation
November 17, 2011State Compliance achieved1 linked violation
November 17, 2011State Compliance achieved1 linked violation
November 17, 2011State Public Notification issued1 linked violation
October 21, 2011State Compliance achieved1 linked violation
July 13, 2011State Compliance achieved1 linked violation
July 13, 2011State Compliance achieved1 linked violation
March 24, 2009State Compliance achieved1 linked violation
September 10, 2008State Compliance achieved1 linked violation
November 3, 2002State Compliance achieved1 linked violation

Contact

Navajo Tribal Utility Authority

9287296277

Ft Defiance, AZ 86504