Winslow, NN

Dilcon Community Boarding School BIA Water System

Current status

1 item on record is 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): NN0436006
System type: Community Water System
Population served: 473
Service connections: 60
Ownership: federal government
Water source: groundwater (wells)

Violation history

Monitoring, Regular
—
Arsenic
April 1, 2025 – June 30, 2025
Archived
Public Notification Violation for NPDWR Violation
—
Public Notice
March 1, 2025
Unaddressed
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
March 1, 2025 – March 31, 2025
Resolved
Monitoring, Regular
—
Arsenic
January 1, 2025 – March 31, 2025
Resolved
Monitoring, Regular
—
Arsenic
October 1, 2024 – November 13, 2024
Resolved
Monitoring, Regular
—
Arsenic
July 1, 2024 – September 30, 2024
Resolved
Monitoring, Regular
—
Nitrate
January 1, 2024 – November 13, 2024
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
January 1, 2024 – December 21, 2023
Resolved
Monitoring, Regular
—
Nitrite
January 1, 2024 – November 13, 2024
Resolved
Monitoring, Regular
—
Arsenic
January 1, 2024 – March 31, 2024
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
January 1, 2024 – March 31, 2024
Resolved
Report Sample Result/Fail Monitor (RTCR)
—
Revised Total Coliform Rule
October 1, 2023 – November 30, 2023
Resolved
Report Sample Result/Fail Monitor (RTCR)
—
Revised Total Coliform Rule
October 1, 2022 – November 17, 2022
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
January 1, 2021 – January 31, 2021
Resolved
Report Sample Result/Fail Monitor (RTCR)
—
Revised Total Coliform Rule
May 1, 2020 – June 19, 2020
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
April 1, 2020 – April 30, 2020
Resolved
Sample Siting Plan Errors (RTCR)
—
Revised Total Coliform Rule
April 1, 2016 – July 18, 2018
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
October 1, 2015 – December 31, 2015
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
July 1, 2015 – September 30, 2015
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
July 1, 2015 – January 21, 2016
Resolved
Monitoring, Regular
—
Arsenic
April 1, 2015 – June 18, 2015
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
January 1, 2015 – June 28, 2015
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
January 1, 2015 – March 18, 2015
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
October 1, 2014 – December 31, 2014
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
July 1, 2014 – September 30, 2014
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
July 1, 2014 – June 23, 2015
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
April 1, 2014 – June 30, 2014
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
January 1, 2014 – March 31, 2014
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
October 1, 2013 – May 7, 2014
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
October 1, 2013 – December 31, 2013
Resolved
Failure Submit IDSE/Subpart V Plan Rpt
—
Stage 2 Disinfectants and Disinfection Byproducts Rule
October 1, 2013 – July 18, 2018
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
December 1, 2012 – December 31, 2012
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
January 1, 2011 – August 19, 2011
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
October 1, 2010 – December 31, 2010
Resolved
Monitoring, Regular
—
Fluoride
January 1, 2008 – December 31, 2010
Resolved
Monitoring, Regular
—
CYANIDE
January 1, 2008 – September 29, 2009
Resolved
Monitoring, Regular
—
2,3,7,8-TCDD
January 1, 2008 – December 31, 2010
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2006 – March 13, 2007
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2005 – March 13, 2007
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
January 1, 2004 – March 29, 2005
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
October 1, 2002 – October 31, 2002
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
October 1, 2002 – October 31, 2002
Archived
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
December 1, 2001 – December 31, 2001
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
December 31, 1996 – January 30, 1997
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
November 30, 1996 – December 29, 1996
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
November 30, 1996 – December 29, 1996
Archived
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
April 30, 1996 – May 29, 1996
Resolved

Archived closed in EPA's records (typically due to age or a data correction)Unaddressed no corrective action on record yetResolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
April 1, 2025 – June 30, 2025	Monitoring, Regular	Arsenic	—	Archived
March 1, 2025	Public Notification Violation for NPDWR Violation	Public Notice	—	Unaddressed
March 1, 2025 – March 31, 2025	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
January 1, 2025 – March 31, 2025	Monitoring, Regular	Arsenic	—	Resolved
October 1, 2024 – November 13, 2024	Monitoring, Regular	Arsenic	—	Resolved
July 1, 2024 – September 30, 2024	Monitoring, Regular	Arsenic	—	Resolved
January 1, 2024 – November 13, 2024	Monitoring, Regular	Nitrate	—	Resolved
January 1, 2024 – December 21, 2023	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
January 1, 2024 – November 13, 2024	Monitoring, Regular	Nitrite	—	Resolved
January 1, 2024 – March 31, 2024	Monitoring, Regular	Arsenic	—	Resolved
January 1, 2024 – March 31, 2024	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
October 1, 2023 – November 30, 2023	Report Sample Result/Fail Monitor (RTCR)	Revised Total Coliform Rule	—	Resolved
October 1, 2022 – November 17, 2022	Report Sample Result/Fail Monitor (RTCR)	Revised Total Coliform Rule	—	Resolved
January 1, 2021 – January 31, 2021	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
May 1, 2020 – June 19, 2020	Report Sample Result/Fail Monitor (RTCR)	Revised Total Coliform Rule	—	Resolved
April 1, 2020 – April 30, 2020	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
April 1, 2016 – July 18, 2018	Sample Siting Plan Errors (RTCR)	Revised Total Coliform Rule	—	Resolved
October 1, 2015 – December 31, 2015	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
July 1, 2015 – September 30, 2015	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
July 1, 2015 – January 21, 2016	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
April 1, 2015 – June 18, 2015	Monitoring, Regular	Arsenic	—	Resolved
January 1, 2015 – June 28, 2015	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
January 1, 2015 – March 18, 2015	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
October 1, 2014 – December 31, 2014	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
July 1, 2014 – September 30, 2014	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
July 1, 2014 – June 23, 2015	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
April 1, 2014 – June 30, 2014	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
January 1, 2014 – March 31, 2014	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
October 1, 2013 – May 7, 2014	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
October 1, 2013 – December 31, 2013	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
October 1, 2013 – July 18, 2018	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
January 1, 2011 – August 19, 2011	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
October 1, 2010 – December 31, 2010	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
January 1, 2008 – December 31, 2010	Monitoring, Regular	Fluoride	—	Resolved
January 1, 2008 – September 29, 2009	Monitoring, Regular	CYANIDE	—	Resolved
January 1, 2008 – December 31, 2010	Monitoring, Regular	2,3,7,8-TCDD	—	Resolved
July 1, 2006 – March 13, 2007	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2005 – March 13, 2007	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
January 1, 2004 – March 29, 2005	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
October 1, 2002 – October 31, 2002	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
October 1, 2002 – October 31, 2002	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived
December 1, 2001 – December 31, 2001	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
December 31, 1996 – January 30, 1997	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
November 30, 1996 – December 29, 1996	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
November 30, 1996 – December 29, 1996	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived
April 30, 1996 – May 29, 1996	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved

Archived closed in EPA's records (typically due to age or a data correction)Unaddressed no corrective action on record yetResolved addressed and confirmed by the state

Enforcement actions

December 5, 2025State Formal Notice of Violation issued1 linked violation
December 5, 2025State Formal Notice of Violation issued1 linked violation
September 8, 2025State Compliance achieved1 linked violation
August 5, 2025State Formal Notice of Violation issued1 linked violation
August 5, 2025State Formal Notice of Violation issued1 linked violation
April 1, 2025State Compliance achieved1 linked violation
November 13, 2024State Compliance achieved1 linked violation
November 13, 2024State Compliance achievedgeneral compliance action — not tied to a specific violation on record
November 13, 2024State Compliance achieved1 linked violation
November 13, 2024State Compliance achieved1 linked violation
November 13, 2024State Compliance achieved1 linked violation
October 5, 2024State Compliance achieved1 linked violation
May 28, 2024State Compliance achieved1 linked violation
December 21, 2023State Compliance achieved1 linked violation
November 30, 2023State Compliance achieved1 linked violation
November 17, 2022State Compliance achieved1 linked violation
February 8, 2021State Compliance achieved1 linked violation
June 19, 2020State Compliance achieved1 linked violation
May 19, 2020State Compliance achieved1 linked violation
July 18, 2018State Compliance achieved1 linked violation
July 18, 2018State Compliance achieved1 linked violation
August 25, 2017State Public Notification issued1 linked violation
August 25, 2017State Public Notification issued1 linked violation
August 25, 2017State Formal Notice of Violation issued1 linked violation
August 25, 2017State Formal Notice of Violation issued1 linked violation
August 31, 2016State Formal Notice of Violation issuedgeneral compliance action — not tied to a specific violation on record
August 31, 2016State Public Notification issuedgeneral compliance action — not tied to a specific violation on record
July 7, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
April 5, 2016State Compliance achieved1 linked violation
March 8, 2016State Public Notification issued1 linked violation
March 8, 2016State Formal Notice of Violation issued1 linked violation
January 21, 2016State Compliance achieved1 linked violation
December 2, 2015State Formal Notice of Violation issued1 linked violation
December 2, 2015State Public Notification issued1 linked violation
December 2, 2015State Compliance achieved1 linked violation
November 30, 2015State Compliance achieved1 linked violation
September 1, 2015State Public Notification received1 linked violation
August 21, 2015State Formal Notice of Violation issued1 linked violation
August 21, 2015State Public Notification issued1 linked violation
June 28, 2015State Public Notification received1 linked violation
June 28, 2015State Public Notification received1 linked violation
June 28, 2015State Compliance achieved1 linked violation
June 23, 2015State Compliance achieved1 linked violation
June 18, 2015State Compliance achieved1 linked violation
June 11, 2015State Public Notification issued1 linked violation
June 11, 2015State Formal Notice of Violation issued1 linked violation
March 18, 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 Public Notification requested1 linked violation
March 5, 2015State Formal Notice of Violation issued1 linked violation
January 8, 2015State Compliance achieved1 linked violation
January 8, 2015State Compliance achieved1 linked violation
January 8, 2015State Compliance achieved1 linked violation
November 17, 2014State Formal Notice of Violation issued1 linked violation
November 17, 2014State Public Notification issued1 linked violation
November 17, 2014State Public Notification issued1 linked violation
October 23, 2014State Public Notification received1 linked violation
August 28, 2014State Formal Notice of Violation issued1 linked violation
August 28, 2014State Public Notification requested1 linked violation
July 29, 2014State Formal Notice of Violation issued1 linked violation
July 29, 2014State Formal Notice of Violation issued1 linked violation
May 7, 2014State Compliance achieved1 linked violation
May 7, 2014State Compliance achieved1 linked violation
April 24, 2014State Formal Notice of Violation issued1 linked violation
April 24, 2014State Public Notification issued1 linked violation
January 14, 2013State Formal Notice of Violation issued1 linked violation
January 14, 2013State 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
October 4, 2012State Compliance achieved1 linked violation
October 4, 2012State Compliance achieved1 linked violation
September 25, 2012State Formal Notice of Violation issuedgeneral compliance action — not tied to a specific violation on record
August 7, 2012State Compliance achieved1 linked violation
February 14, 2012State Public Notification received1 linked violation
February 13, 2012State Public Notification received1 linked violation
February 13, 2012State Public Notification received1 linked violation
December 6, 2011State Compliance achieved1 linked violation
November 17, 2011State Formal Notice of Violation issued1 linked violation
November 17, 2011State Public Notification issued1 linked violation
November 14, 2011State Formal Notice of Violation issued1 linked violation
November 14, 2011State Formal Notice of Violation issuedgeneral compliance action — not tied to a specific violation on record
November 14, 2011State Formal Notice of Violation issued1 linked violation
November 14, 2011State Public Notification issued1 linked violation
November 14, 2011State Public Notification issued1 linked violation
November 14, 2011State Public Notification issued1 linked violation
November 14, 2011State Public Notification issuedgeneral compliance action — not tied to a specific violation on record
November 14, 2011State Formal Notice of Violation issued1 linked violation
August 19, 2011State Compliance achieved1 linked violation
April 20, 2011State Public Notification receivedgeneral compliance action — not tied to a specific violation on record
December 1, 2010State Compliance achievedgeneral compliance action — not tied to a specific violation on record
September 29, 2009State Compliance achieved1 linked violation
June 25, 2007State Public Notification receivedgeneral compliance action — not tied to a specific violation on record
March 16, 2007State Compliance achieved1 linked violation
March 13, 2007State Compliance achieved2 linked violations
November 9, 2006State Violation/Reminder Notice1 linked violation
November 15, 2005State Violation/Reminder Notice1 linked violation
March 29, 2005State Compliance achieved1 linked violation
December 5, 2000State Compliance achieved3 linked violations

Contact

BIA Dilcon Community School, Inc

9286573211

Winslow, AZ 86047