GREAT FALLS, MT · Cascade County

SUN PRAIRIE WATER DISTRICT 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 Montana’s official records. Always confirm current status with Montana before making decisions based on this information.

System facts

System ID (PWSID): MT0000571
System type: Community Water System
Population served: 350
Service connections: 103
Ownership: local government
Water source: groundwater (wells)

Violation history

Monitoring, Regular
—
Nitrate-Nitrite
January 1, 2025 – December 31, 2025
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
October 1, 2023 – November 1, 2023
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2023 – October 19, 2023
Resolved
Monitoring, Regular
—
o-Dichlorobenzene
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Heptachlor epoxide
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
2,4-D
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
2,4,5-TP
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
HEXACHLOROBENZENE
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Benzo(a)pyrene
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Pentachlorophenol
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Chlordane
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
1,2,4-Trichlorobenzene
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
cis-1,2-Dichloroethylene
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Xylenes, Total
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
DICHLOROMETHANE
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
p-Dichlorobenzene
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Vinyl chloride
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
1,1-Dichloroethylene
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
trans-1,2-Dichloroethylene
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
1,2-Dichloroethane
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
1,1,1-Trichloroethane
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Carbon tetrachloride
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
1,2-Dichloropropane
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Trichloroethylene
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
1,1,2-Trichloroethane
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Tetrachloroethylene
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
CHLOROBENZENE
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Benzene
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Toluene
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Ethylbenzene
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Styrene
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Endrin
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
BHC-GAMMA
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Methoxychlor
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Toxaphene
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Dalapon
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) adipate
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
OXAMYL
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Simazine
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) phthalate
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Picloram
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Dinoseb
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Hexachlorocyclopentadiene
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Carbofuran
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Atrazine
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
LASSO
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Regular
—
Heptachlor
January 1, 2023 – December 31, 2025
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
December 1, 2021 – December 31, 2021
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
October 1, 2021 – October 28, 2021
Resolved
Lead Consumer Notice
—
Lead and Copper Rule
December 30, 2020 – January 25, 2021
Resolved
Monitoring, Regular
—
Thallium, Total
January 1, 2020 – December 31, 2022
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
February 1, 2019 – February 28, 2019
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2018 – October 17, 2018
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
January 1, 2017 – December 31, 2025
Archived
Sample Siting Plan Errors (RTCR)
—
Revised Total Coliform Rule
April 2, 2016 – November 25, 2020
Resolved
Lead Consumer Notice
—
Lead and Copper Rule
December 30, 2014 – May 8, 2015
Resolved
Monitoring and Reporting (DBP)
—
Chlorine
January 1, 2012 – March 31, 2012
Resolved
Monitoring and Reporting (DBP)
—
TTHM
July 1, 2009 – September 30, 2009
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
July 1, 2009 – September 30, 2009
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2006 – March 1, 2007
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2005 – April 18, 2007
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
July 1, 1996 – July 31, 1996
Resolved
Monitoring, Repeat Major (TCR)
—
Coliform (TCR)
June 1, 1996 – June 30, 1996
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
May 1, 1996 – May 31, 1996
Resolved
Monitoring, Regular
—
Pentachlorophenol
January 1, 1996 – December 31, 1998
Resolved
Monitoring, Regular
—
Dinoseb
January 1, 1996 – December 31, 1998
Resolved
Monitoring, Regular
—
Simazine
January 1, 1996 – December 31, 1998
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) adipate
January 1, 1996 – December 31, 1998
Resolved
Monitoring, Regular
—
Picloram
January 1, 1996 – December 31, 1998
Resolved
Monitoring, Regular
—
Methoxychlor
January 1, 1996 – December 31, 1998
Resolved
Monitoring, Regular
—
Aldicarb
January 1, 1996 – December 31, 1998
Resolved
Monitoring, Regular
—
OXAMYL
January 1, 1996 – December 31, 1998
Resolved
Monitoring, Repeat Major (TCR)
—
Coliform (TCR)
September 1, 1995 – September 30, 1995
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
August 1, 1993 – August 31, 1993
Resolved

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Period	Violation	Contaminant / rule	Health-based	Status
January 1, 2025 – December 31, 2025	Monitoring, Regular	Nitrate-Nitrite	—	Resolved
October 1, 2023 – November 1, 2023	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
July 1, 2023 – October 19, 2023	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	o-Dichlorobenzene	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Heptachlor epoxide	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	2,4-D	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	2,4,5-TP	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	HEXACHLOROBENZENE	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Benzo(a)pyrene	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Pentachlorophenol	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Chlordane	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	1,2,4-Trichlorobenzene	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	cis-1,2-Dichloroethylene	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Xylenes, Total	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	DICHLOROMETHANE	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	p-Dichlorobenzene	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Vinyl chloride	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	1,1-Dichloroethylene	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	trans-1,2-Dichloroethylene	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	1,2-Dichloroethane	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	1,1,1-Trichloroethane	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Carbon tetrachloride	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	1,2-Dichloropropane	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Trichloroethylene	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	1,1,2-Trichloroethane	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Tetrachloroethylene	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	CHLOROBENZENE	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Benzene	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Toluene	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Ethylbenzene	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Styrene	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Endrin	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	BHC-GAMMA	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Methoxychlor	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Toxaphene	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Dalapon	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Di(2-ethylhexyl) adipate	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	OXAMYL	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Simazine	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Di(2-ethylhexyl) phthalate	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Picloram	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Dinoseb	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Hexachlorocyclopentadiene	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Carbofuran	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Atrazine	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	LASSO	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring, Regular	Heptachlor	—	Resolved
December 1, 2021 – December 31, 2021	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
October 1, 2021 – October 28, 2021	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
December 30, 2020 – January 25, 2021	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
January 1, 2020 – December 31, 2022	Monitoring, Regular	Thallium, Total	—	Resolved
February 1, 2019 – February 28, 2019	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
July 1, 2018 – October 17, 2018	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
January 1, 2017 – December 31, 2025	Monitoring, Regular	Combined Radium (-226 and -228)	—	Archived
April 2, 2016 – November 25, 2020	Sample Siting Plan Errors (RTCR)	Revised Total Coliform Rule	—	Resolved
December 30, 2014 – May 8, 2015	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
January 1, 2012 – March 31, 2012	Monitoring and Reporting (DBP)	Chlorine	—	Resolved
July 1, 2009 – September 30, 2009	Monitoring and Reporting (DBP)	TTHM	—	Resolved
July 1, 2009 – September 30, 2009	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
July 1, 2006 – March 1, 2007	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2005 – April 18, 2007	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 1996 – July 31, 1996	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
June 1, 1996 – June 30, 1996	Monitoring, Repeat Major (TCR)	Coliform (TCR)	—	Resolved
May 1, 1996 – May 31, 1996	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
January 1, 1996 – December 31, 1998	Monitoring, Regular	Pentachlorophenol	—	Resolved
January 1, 1996 – December 31, 1998	Monitoring, Regular	Dinoseb	—	Resolved
January 1, 1996 – December 31, 1998	Monitoring, Regular	Simazine	—	Resolved
January 1, 1996 – December 31, 1998	Monitoring, Regular	Di(2-ethylhexyl) adipate	—	Resolved
January 1, 1996 – December 31, 1998	Monitoring, Regular	Picloram	—	Resolved
January 1, 1996 – December 31, 1998	Monitoring, Regular	Methoxychlor	—	Resolved
January 1, 1996 – December 31, 1998	Monitoring, Regular	Aldicarb	—	Resolved
January 1, 1996 – December 31, 1998	Monitoring, Regular	OXAMYL	—	Resolved
September 1, 1995 – September 30, 1995	Monitoring, Repeat Major (TCR)	Coliform (TCR)	—	Resolved
August 1, 1993 – August 31, 1993	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

January 24, 2026State Public Notification requested21 linked violations
January 24, 2026State Public Notification requested1 linked violation
January 24, 2026State Violation/Reminder Notice1 linked violation
January 24, 2026State Violation/Reminder Notice21 linked violations
January 22, 2026State Violation/Reminder Notice24 linked violations
January 22, 2026State Public Notification requested23 linked violations
January 14, 2026State Compliance achieved23 linked violations
January 14, 2026State Compliance achieved1 linked violation
January 14, 2026State Compliance achieved21 linked violations
January 13, 2026State Violation/Reminder Notice1 linked violation
January 13, 2026State Public Notification requested1 linked violation
November 1, 2023State Compliance achieved1 linked violation
October 19, 2023State Compliance achieved1 linked violation
October 13, 2023State Violation/Reminder Notice1 linked violation
August 9, 2023State Compliance achieved1 linked violation
July 11, 2023State Violation/Reminder Notice1 linked violation
January 25, 2023State Public Notification requested1 linked violation
January 25, 2023State Violation/Reminder Notice1 linked violation
February 3, 2022State Public Notification requested1 linked violation
February 3, 2022State Violation/Reminder Notice1 linked violation
January 11, 2022State Compliance achieved1 linked violation
October 28, 2021State Compliance achieved1 linked violation
October 15, 2021State Violation/Reminder Notice1 linked violation
January 25, 2021State Compliance achieved1 linked violation
January 7, 2021State Violation/Reminder Notice1 linked violation
November 25, 2020State Compliance achieved1 linked violation
March 19, 2019State Compliance achieved1 linked violation
March 15, 2019State Public Notification requested1 linked violation
March 15, 2019State Violation/Reminder Notice1 linked violation
October 17, 2018State Compliance achieved1 linked violation
July 17, 2018State Violation/Reminder Notice1 linked violation
January 4, 2017State Public Notification requested1 linked violation
January 4, 2017State Violation/Reminder Notice1 linked violation
May 8, 2015State Compliance achieved1 linked violation
January 26, 2015State Violation/Reminder Notice1 linked violation
February 19, 2013State Compliance achieved1 linked violation
April 13, 2012State Violation/Reminder Notice1 linked violation
April 13, 2012State Public Notification requested1 linked violation
October 21, 2010State Compliance achieved2 linked violations
January 24, 2010State Violation/Reminder Notice2 linked violations
January 24, 2010State Public Notification requested2 linked violations
May 29, 2009State Compliance achieved1 linked violation
May 15, 2009State Compliance achieved1 linked violation
May 15, 2009State Compliance achieved1 linked violation
May 15, 2009State Compliance achieved1 linked violation
May 15, 2009State Compliance achieved1 linked violation
May 15, 2009State Compliance achieved1 linked violation
May 15, 2009State Compliance achieved1 linked violation
May 15, 2009State Compliance achieved2 linked violations
April 18, 2007State Compliance achieved1 linked violation
March 1, 2007State Compliance achieved1 linked violation
February 5, 2007State Violation/Reminder Notice1 linked violation
July 25, 2006State Other1 linked violation
August 16, 2005State Violation/Reminder Notice1 linked violation
September 5, 2002State Public Notification received5 linked violations
September 5, 2002State Public Notification received1 linked violation
July 25, 2002State Public Notification requested1 linked violation
July 12, 2002State Public Notification requested4 linked violations
July 12, 2002State Violation/Reminder Notice4 linked violations
May 18, 2001State Compliance achieved25 linked violations
July 18, 1996State Violation/Reminder Notice1 linked violation

Contact

SUN PRAIRIE COUNTY WATER DISTRICT

406-964-0106

GREAT FALLS, MT 59404