Ft Defiance, NN

Twin Lakes NTUA Water System

Current status

No open violations on record as of July 4, 2026.

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): NN3500261
System type: Community Water System
Population served: 1,833
Service connections: 536
Ownership: Native American tribal
Water source: groundwater (wells)

Violation history

Monitoring, Routine (IDSE)
—
TTHM
January 1, 2020 – December 31, 2020
Resolved
Monitoring, Routine (IDSE)
—
Total Haloacetic Acids (HAA5)
January 1, 2020 – December 31, 2020
Resolved
Treatment Technique, Corrective/Expedited Actions (RTCR)
Health-based
Revised Total Coliform Rule
April 1, 2016 – May 9, 2016
Resolved
Sample Siting Plan Errors (RTCR)
—
Revised Total Coliform Rule
April 1, 2016 – September 30, 2025
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
September 1, 2015 – September 30, 2015
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
April 1, 2014 – April 30, 2014
Resolved
Monitoring, Regular
—
Nitrite
January 1, 2014 – December 31, 2014
Resolved
Monitoring, Regular
—
Nitrate
January 1, 2014 – December 31, 2014
Resolved
Failure Submit IDSE/Subpart V Plan Rpt
—
Stage 2 Disinfectants and Disinfection Byproducts Rule
October 1, 2013 – February 18, 2025
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
Monitoring, Regular
—
2,3,7,8-TCDD
January 1, 2011 – September 11, 2013
Resolved
Monitoring and Reporting (DBP)
—
TTHM
January 1, 2011 – December 31, 2011
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
January 1, 2011 – December 31, 2011
Resolved
Monitoring and Reporting (DBP)
—
TTHM
January 1, 2010 – December 31, 2010
Resolved
Monitoring, Regular
—
Nitrite
January 1, 2010 – December 31, 2010
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
January 1, 2010 – December 31, 2010
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
August 1, 2009 – August 31, 2009
Resolved
Monitoring, Regular
—
Barium
January 1, 2008 – December 31, 2010
Resolved
Monitoring, Regular
—
CYANIDE
January 1, 2008 – December 31, 2010
Resolved
Monitoring, Regular
—
Fluoride
January 1, 2008 – December 31, 2010
Resolved
Monitoring, Regular
—
Mercury
January 1, 2008 – December 31, 2010
Resolved
Monitoring, Regular
—
1,2,4-Trichlorobenzene
January 1, 2005 – December 31, 2010
Resolved
Monitoring, Regular
—
Tetrachloroethylene
January 1, 2005 – December 31, 2010
Resolved
Monitoring, Regular
—
CHLOROBENZENE
January 1, 2005 – December 31, 2010
Resolved
Monitoring, Regular
—
Benzene
January 1, 2005 – December 31, 2010
Resolved
Monitoring, Regular
—
Toluene
January 1, 2005 – December 31, 2010
Resolved
Monitoring, Regular
—
Ethylbenzene
January 1, 2005 – December 31, 2010
Resolved
Monitoring, Regular
—
Styrene
January 1, 2005 – December 31, 2010
Resolved
Monitoring, Regular
—
1,1,2-Trichloroethane
January 1, 2005 – 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
Monitoring, Regular
—
Trichloroethylene
January 1, 2005 – December 31, 2010
Resolved
Monitoring, Regular
—
1,2-Dichloropropane
January 1, 2005 – December 31, 2010
Resolved
Monitoring, Regular
—
Carbon tetrachloride
January 1, 2005 – December 31, 2010
Resolved
Monitoring, Regular
—
1,1,1-Trichloroethane
January 1, 2005 – December 31, 2010
Resolved
Monitoring, Regular
—
1,2-Dichloroethane
January 1, 2005 – December 31, 2010
Resolved
Monitoring, Regular
—
trans-1,2-Dichloroethylene
January 1, 2005 – December 31, 2010
Resolved
Monitoring, Regular
—
1,1-Dichloroethylene
January 1, 2005 – December 31, 2010
Resolved
Monitoring, Regular
—
Vinyl chloride
January 1, 2005 – December 31, 2010
Resolved
Monitoring, Regular
—
p-Dichlorobenzene
January 1, 2005 – December 31, 2010
Resolved
Monitoring, Regular
—
o-Dichlorobenzene
January 1, 2005 – December 31, 2010
Resolved
Monitoring, Regular
—
DICHLOROMETHANE
January 1, 2005 – December 31, 2010
Resolved
Monitoring, Regular
—
Xylenes, Total
January 1, 2005 – December 31, 2010
Resolved
Monitoring, Regular
—
cis-1,2-Dichloroethylene
January 1, 2005 – December 31, 2010
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
January 1, 2004 – December 31, 2004
Resolved

Resolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
January 1, 2020 – December 31, 2020	Monitoring, Routine (IDSE)	TTHM	—	Resolved
January 1, 2020 – December 31, 2020	Monitoring, Routine (IDSE)	Total Haloacetic Acids (HAA5)	—	Resolved
April 1, 2016 – May 9, 2016	Treatment Technique, Corrective/Expedited Actions (RTCR)	Revised Total Coliform Rule	Health-based	Resolved
April 1, 2016 – September 30, 2025	Sample Siting Plan Errors (RTCR)	Revised Total Coliform Rule	—	Resolved
September 1, 2015 – September 30, 2015	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
April 1, 2014 – April 30, 2014	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
January 1, 2014 – December 31, 2014	Monitoring, Regular	Nitrite	—	Resolved
January 1, 2014 – December 31, 2014	Monitoring, Regular	Nitrate	—	Resolved
October 1, 2013 – February 18, 2025	Failure Submit IDSE/Subpart V Plan Rpt	Stage 2 Disinfectants and Disinfection Byproducts Rule	—	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
January 1, 2011 – September 11, 2013	Monitoring, Regular	2,3,7,8-TCDD	—	Resolved
January 1, 2011 – December 31, 2011	Monitoring and Reporting (DBP)	TTHM	—	Resolved
January 1, 2011 – December 31, 2011	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
January 1, 2010 – December 31, 2010	Monitoring and Reporting (DBP)	TTHM	—	Resolved
January 1, 2010 – December 31, 2010	Monitoring, Regular	Nitrite	—	Resolved
January 1, 2010 – December 31, 2010	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
August 1, 2009 – August 31, 2009	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
January 1, 2008 – December 31, 2010	Monitoring, Regular	Barium	—	Resolved
January 1, 2008 – December 31, 2010	Monitoring, Regular	CYANIDE	—	Resolved
January 1, 2008 – December 31, 2010	Monitoring, Regular	Fluoride	—	Resolved
January 1, 2008 – December 31, 2010	Monitoring, Regular	Mercury	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	1,2,4-Trichlorobenzene	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	Tetrachloroethylene	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	CHLOROBENZENE	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	Benzene	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	Toluene	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	Ethylbenzene	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	Styrene	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	1,1,2-Trichloroethane	—	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
January 1, 2005 – December 31, 2010	Monitoring, Regular	Trichloroethylene	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	1,2-Dichloropropane	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	Carbon tetrachloride	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	1,1,1-Trichloroethane	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	1,2-Dichloroethane	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	trans-1,2-Dichloroethylene	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	1,1-Dichloroethylene	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	Vinyl chloride	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	p-Dichlorobenzene	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	o-Dichlorobenzene	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	DICHLOROMETHANE	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	Xylenes, Total	—	Resolved
January 1, 2005 – December 31, 2010	Monitoring, Regular	cis-1,2-Dichloroethylene	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved

Resolved addressed and confirmed by the state

Enforcement actions

September 30, 2025State Compliance achieved1 linked violation
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
February 18, 2025State Compliance achieved1 linked violation
August 28, 2024State Formal Notice of Violation issued1 linked violation
July 6, 2021State Compliance achieved1 linked violation
July 6, 2021State Compliance achieved1 linked violation
March 31, 2021State Public Notification issued1 linked violation
March 31, 2021State Formal Notice of Violation issued1 linked violation
March 31, 2021State Formal Notice of Violation issued1 linked violation
March 31, 2021State Public Notification issued1 linked violation
August 28, 2017State Formal Notice of Violation issued1 linked violation
August 28, 2017State Public Notification issued1 linked violation
August 31, 2016State Public Notification issued1 linked violation
August 31, 2016State Formal Notice of Violation issued1 linked violation
May 9, 2016State Public Notification received1 linked violation
May 9, 2016State Compliance achieved1 linked violation
December 2, 2015State Public Notification issued1 linked violation
December 2, 2015State Formal Notice of Violation issued1 linked violation
October 9, 2015State Compliance achieved1 linked violation
April 14, 2015State Compliance achieved1 linked violation
April 14, 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 Public Notification requested1 linked violation
August 28, 2014State Formal Notice of Violation issued1 linked violation
August 28, 2014State Public Notification requested1 linked violation
May 13, 2014State Compliance achieved1 linked violation
May 6, 2014State Public Notification issued1 linked violation
May 6, 2014State Formal Notice of Violation issued1 linked violation
September 11, 2013State Compliance achieved1 linked violation
July 16, 2013State Compliance achieved1 linked violation
July 16, 2013State Compliance achieved1 linked violation
July 16, 2013State Compliance achieved1 linked violation
July 16, 2013State Compliance achieved1 linked violation
January 11, 2013State Compliance achieved1 linked violation
January 11, 2013State Formal Notice of Violation issued1 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
June 13, 2012State Compliance achieved1 linked violation
March 1, 2012State Public Notification issued1 linked violation
March 1, 2012State Formal Notice of Violation issued1 linked violation
March 1, 2012State Formal Notice of Violation issued1 linked violation
March 1, 2012State Public Notification issued1 linked violation
February 21, 2012State Compliance achieved1 linked violation
February 21, 2012State Compliance achieved1 linked violation
February 21, 2012State Compliance achieved1 linked violation
February 21, 2012State Compliance achieved1 linked violation
February 21, 2012State Compliance achieved1 linked violation
February 21, 2012State Compliance achieved1 linked violation
February 21, 2012State Compliance achieved1 linked violation
February 21, 2012State Compliance achieved1 linked violation
February 21, 2012State Compliance achieved1 linked violation
February 21, 2012State Compliance achieved1 linked violation
February 21, 2012State Compliance achieved1 linked violation
February 21, 2012State Compliance achieved1 linked violation
February 21, 2012State Compliance achieved1 linked violation
February 21, 2012State Compliance achieved1 linked violation
February 21, 2012State Compliance achieved1 linked violation
February 21, 2012State Compliance achieved1 linked violation
February 21, 2012State Compliance achieved1 linked violation
February 21, 2012State Compliance achieved1 linked violation
February 21, 2012State Compliance achieved1 linked violation
February 21, 2012State Compliance achieved1 linked violation
February 21, 2012State Compliance achieved1 linked violation
November 3, 2011State Formal Notice of Violation issued1 linked violation
November 3, 2011State Formal Notice of Violation issued1 linked violation
November 3, 2011State Public Notification issued1 linked violation
November 3, 2011State Public Notification issued1 linked violation
November 3, 2011State Public Notification issued1 linked violation
November 3, 2011State Public Notification issued1 linked violation
November 3, 2011State Formal Notice of Violation issued1 linked violation
November 3, 2011State Compliance achieved1 linked violation
November 3, 2011State Compliance achieved1 linked violation
November 3, 2011State Compliance achieved1 linked violation
November 3, 2011State Formal Notice of Violation issued1 linked violation
November 3, 2011State Formal Notice of Violation issued1 linked violation
November 3, 2011State Formal Notice of Violation issued1 linked violation
November 3, 2011State Public Notification issued1 linked violation
November 3, 2011State Public Notification issued1 linked violation
October 21, 2011State Compliance achieved1 linked violation
June 20, 2011State Compliance achieved1 linked violation
June 20, 2011State Compliance achieved1 linked violation
June 20, 2011State Compliance achieved1 linked violation
May 11, 2010State Formal Notice of Violation issued1 linked violation
May 11, 2010State Public Notification requested1 linked violation
September 10, 2009State Compliance achieved1 linked violation
April 7, 2005State Compliance achieved1 linked violation

Contact

Navajo Tribal Utility Authority

9287296277

Ft Defiance, AZ 86504