Shonto, NN

Shonto Preparatory Boarding School BIA 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): NN0433016
System type: Community Water System
Population served: 664
Service connections: 166
Ownership: federal government
Water source: groundwater (wells)

Violation history

Report Sample Result/Fail Monitor (RTCR)
—
Revised Total Coliform Rule
January 1, 2024 – February 20, 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
Report Sample Result/Fail Monitor (RTCR)
—
Revised Total Coliform Rule
May 1, 2020 – June 19, 2020
Resolved
Monitoring, Source Water (GWR)
—
E. COLI
February 1, 2018 – February 12, 2018
Resolved
Sample Siting Plan Errors (RTCR)
—
Revised Total Coliform Rule
April 1, 2016 – December 20, 2017
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
November 1, 2014 – November 30, 2014
Resolved
Failure Submit IDSE/Subpart V Plan Rpt
—
Stage 2 Disinfectants and Disinfection Byproducts Rule
October 1, 2013 – December 20, 2017
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
December 1, 2012 – December 31, 2012
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
January 1, 2010 – December 31, 2010
Resolved
Monitoring and Reporting (DBP)
—
TTHM
January 1, 2010 – December 31, 2010
Resolved
Monitoring, Regular
—
2,3,7,8-TCDD
January 1, 2008 – December 31, 2010
Resolved
Monitoring, Regular
—
Arsenic
January 1, 2008 – December 31, 2010
Resolved
Monitoring, Regular
—
Barium
January 1, 2008 – December 31, 2010
Resolved
Monitoring, Regular
—
Cadmium
January 1, 2008 – December 31, 2010
Resolved
Monitoring, Regular
—
Chromium
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
—
Selenium
January 1, 2008 – December 31, 2010
Resolved
Monitoring, Regular
—
Antimony, Total
January 1, 2008 – December 31, 2010
Resolved
Monitoring, Regular
—
Beryllium, Total
January 1, 2008 – December 31, 2010
Resolved
Monitoring, Regular
—
Thallium, Total
January 1, 2008 – December 31, 2010
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2006 – March 9, 2007
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2005 – March 9, 2007
Resolved
Monitoring, Regular
—
Hexachlorocyclopentadiene
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Aldicarb sulfoxide
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Aldicarb sulfone
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Carbofuran
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Aldicarb
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Atrazine
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
LASSO
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
2,3,7,8-TCDD
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Picloram
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Heptachlor
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Heptachlor epoxide
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
2,4-D
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
2,4,5-TP
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
HEXACHLOROBENZENE
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Benzo(a)pyrene
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Pentachlorophenol
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
1,2,4-Trichlorobenzene
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
cis-1,2-Dichloroethylene
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Total Polychlorinated Biphenyls (PCB)
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
1,2-DIBROMO-3-CHLOROPROPANE
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
ETHYLENE DIBROMIDE
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Xylenes, Total
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Chlordane
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
DICHLOROMETHANE
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
o-Dichlorobenzene
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
p-Dichlorobenzene
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Vinyl chloride
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
1,1-Dichloroethylene
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
trans-1,2-Dichloroethylene
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
1,2-Dichloroethane
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
1,1,1-Trichloroethane
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Carbon tetrachloride
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
1,2-Dichloropropane
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Trichloroethylene
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
1,1,2-Trichloroethane
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Tetrachloroethylene
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
CHLOROBENZENE
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Benzene
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Toluene
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Ethylbenzene
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Styrene
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) phthalate
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Simazine
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
OXAMYL
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) adipate
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Glyphosate
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Endothall
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Diquat
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Dalapon
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Toxaphene
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Methoxychlor
January 1, 2004 – December 31, 2004
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
January 1, 2004 – December 20, 2005
Resolved
Monitoring, Regular
—
BHC-GAMMA
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Dinoseb
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Endrin
January 1, 2004 – December 31, 2004
Resolved

Resolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
January 1, 2024 – February 20, 2024	Report Sample Result/Fail Monitor (RTCR)	Revised Total Coliform Rule	—	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
May 1, 2020 – June 19, 2020	Report Sample Result/Fail Monitor (RTCR)	Revised Total Coliform Rule	—	Resolved
February 1, 2018 – February 12, 2018	Monitoring, Source Water (GWR)	E. COLI	—	Resolved
April 1, 2016 – December 20, 2017	Sample Siting Plan Errors (RTCR)	Revised Total Coliform Rule	—	Resolved
November 1, 2014 – November 30, 2014	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
October 1, 2013 – December 20, 2017	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, 2010 – December 31, 2010	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
January 1, 2010 – December 31, 2010	Monitoring and Reporting (DBP)	TTHM	—	Resolved
January 1, 2008 – December 31, 2010	Monitoring, Regular	2,3,7,8-TCDD	—	Resolved
January 1, 2008 – December 31, 2010	Monitoring, Regular	Arsenic	—	Resolved
January 1, 2008 – December 31, 2010	Monitoring, Regular	Barium	—	Resolved
January 1, 2008 – December 31, 2010	Monitoring, Regular	Cadmium	—	Resolved
January 1, 2008 – December 31, 2010	Monitoring, Regular	Chromium	—	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, 2008 – December 31, 2010	Monitoring, Regular	Selenium	—	Resolved
January 1, 2008 – December 31, 2010	Monitoring, Regular	Antimony, Total	—	Resolved
January 1, 2008 – December 31, 2010	Monitoring, Regular	Beryllium, Total	—	Resolved
January 1, 2008 – December 31, 2010	Monitoring, Regular	Thallium, Total	—	Resolved
July 1, 2006 – March 9, 2007	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2005 – March 9, 2007	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Hexachlorocyclopentadiene	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Aldicarb sulfoxide	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Aldicarb sulfone	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Carbofuran	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Aldicarb	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Atrazine	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	LASSO	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	2,3,7,8-TCDD	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Picloram	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Heptachlor	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Heptachlor epoxide	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	2,4-D	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	2,4,5-TP	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	HEXACHLOROBENZENE	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Benzo(a)pyrene	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Pentachlorophenol	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	1,2,4-Trichlorobenzene	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	cis-1,2-Dichloroethylene	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Total Polychlorinated Biphenyls (PCB)	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	1,2-DIBROMO-3-CHLOROPROPANE	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	ETHYLENE DIBROMIDE	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Xylenes, Total	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Chlordane	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	DICHLOROMETHANE	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	o-Dichlorobenzene	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	p-Dichlorobenzene	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Vinyl chloride	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	1,1-Dichloroethylene	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	trans-1,2-Dichloroethylene	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	1,2-Dichloroethane	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	1,1,1-Trichloroethane	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Carbon tetrachloride	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	1,2-Dichloropropane	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Trichloroethylene	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	1,1,2-Trichloroethane	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Tetrachloroethylene	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	CHLOROBENZENE	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Benzene	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Toluene	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Ethylbenzene	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Styrene	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Di(2-ethylhexyl) phthalate	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Simazine	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	OXAMYL	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Di(2-ethylhexyl) adipate	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Glyphosate	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Endothall	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Diquat	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Dalapon	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Toxaphene	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Methoxychlor	—	Resolved
January 1, 2004 – December 20, 2005	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	BHC-GAMMA	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Dinoseb	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Endrin	—	Resolved

Resolved addressed and confirmed by the state

Enforcement actions

April 22, 2025State Formal Notice of Violation issuedgeneral compliance action — not tied to a specific violation on record
April 22, 2025State Formal Notice of Violation issuedgeneral compliance action — not tied to a specific violation on record
April 22, 2025State Formal Notice of Violation issuedgeneral compliance action — not tied to a specific violation on record
April 22, 2025State Formal Notice of Violation issuedgeneral compliance action — not tied to a specific violation on record
April 22, 2025State Formal Notice of Violation issuedgeneral compliance action — not tied to a specific violation on record
April 22, 2025State Formal Notice of Violation issuedgeneral compliance action — not tied to a specific violation on record
October 9, 2024State Compliance achievedgeneral compliance action — not tied to a specific violation on record
February 20, 2024State Compliance achieved1 linked violation
November 30, 2023State Compliance achieved1 linked violation
November 17, 2022State Compliance achieved1 linked violation
June 19, 2020State Compliance achieved1 linked violation
May 31, 2018State Formal Notice of Violation issued1 linked violation
February 12, 2018State Compliance achieved1 linked violation
December 20, 2017State Compliance achieved1 linked violation
December 20, 2017State Compliance achieved1 linked violation
August 28, 2017State Public Notification issued1 linked violation
August 28, 2017State Public Notification issued1 linked violation
August 28, 2017State Formal Notice of Violation issued1 linked violation
August 28, 2017State 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 Compliance achieved1 linked violation
January 14, 2013State Formal Notice of Violation issued1 linked violation
January 14, 2013State Compliance achieved1 linked violation
December 19, 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
February 13, 2012State Public Notification received1 linked violation
February 8, 2012State Public Notification receivedgeneral compliance action — not tied to a specific violation on record
November 14, 2011State Compliance achieved1 linked violation
November 14, 2011State Compliance achieved1 linked violation
November 14, 2011State Compliance achieved1 linked violation
November 14, 2011State Compliance achieved1 linked violation
November 14, 2011State Compliance achieved1 linked violation
November 14, 2011State Compliance achieved1 linked violation
November 14, 2011State Compliance achieved1 linked violation
November 14, 2011State Compliance achieved1 linked violation
November 14, 2011State Compliance achieved1 linked violation
November 14, 2011State Compliance achieved1 linked violation
November 14, 2011State Compliance achieved1 linked violation
November 14, 2011State Compliance achieved1 linked violation
November 14, 2011State Compliance achieved1 linked violation
November 14, 2011State Formal Notice of Violation issued1 linked violation
November 14, 2011State Public Notification issued1 linked violation
March 9, 2007State Compliance achieved2 linked violations
November 9, 2006State Violation/Reminder Notice1 linked violation
December 20, 2005State Compliance achieved1 linked violation
November 15, 2005State Violation/Reminder Notice1 linked violation
February 14, 2005State Compliance achieved54 linked violations

Contact

BIA Shonto Preparatory School

9286723500

Shonto, AZ 86054