COLSTRIP, MT · Rosebud County

COLSTRIP CITY OF 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): MT0000180
System type: Community Water System
Population served: 2,350
Service connections: 913
Ownership: local government
Water source: surface water (rivers, lakes, or reservoirs)

Violation history

Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
July 1, 2024 – July 31, 2024
Resolved
Maximum Contaminant Level Violation, Average
Health-based
TTHM
July 1, 2024 – September 30, 2024
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
January 1, 2024 – January 31, 2024
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
January 1, 2024 – January 31, 2024
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
January 1, 2024 – January 31, 2024
Resolved
Monitoring and Reporting (DBP)
—
TTHM
July 1, 2023 – September 30, 2023
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
July 1, 2023 – September 30, 2023
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
May 1, 2022 – May 31, 2022
Resolved
Monitoring, Regular
—
Asbestos
January 1, 2011 – October 30, 2013
Resolved
Monitoring, Repeat Minor (TCR)
—
Coliform (TCR)
August 1, 2008 – August 31, 2008
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
September 1, 2007 – September 30, 2007
Resolved
Monitoring and Reporting (DBP)
—
CARBON, TOTAL
July 1, 2004 – September 30, 2004
Resolved
Monitoring and Reporting (DBP)
—
CARBON, TOTAL
July 1, 2004 – September 30, 2004
Resolved
Monitoring and Reporting (DBP)
—
CARBON, TOTAL
July 1, 2004 – September 30, 2004
Resolved
Monitoring and Reporting (DBP)
—
CARBON, TOTAL
July 1, 2004 – September 30, 2004
Resolved
Monitoring and Reporting (DBP)
—
CARBON, TOTAL
July 1, 2004 – September 30, 2004
Resolved
Monitoring and Reporting (DBP)
—
CARBON, TOTAL
July 1, 2004 – September 30, 2004
Resolved
Monitoring, Regular
—
Barium
January 1, 2003 – December 31, 2003
Resolved
Monitoring, Regular
—
Selenium
January 1, 2003 – December 31, 2003
Resolved
Monitoring, Regular
—
Thallium, Total
January 1, 2003 – December 31, 2003
Resolved
Monitoring, Regular
—
Beryllium, Total
January 1, 2003 – December 31, 2003
Resolved
Monitoring, Regular
—
Antimony, Total
January 1, 2003 – December 31, 2003
Resolved
Monitoring, Regular
—
Nickel
January 1, 2003 – December 31, 2003
Resolved
Monitoring, Regular
—
Mercury
January 1, 2003 – December 31, 2003
Resolved
Monitoring, Regular
—
Fluoride
January 1, 2003 – December 31, 2003
Resolved
Monitoring, Regular
—
Chromium
January 1, 2003 – December 31, 2003
Resolved
Monitoring, Regular
—
Cadmium
January 1, 2003 – December 31, 2003
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
October 1, 2001 – September 21, 2005
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
June 1, 1998 – June 30, 1998
Resolved
Monitoring, Regular
—
Mercury
January 1, 1997 – December 31, 1997
Resolved
Monitoring, Regular
—
Barium
January 1, 1997 – December 31, 1997
Resolved
Monitoring, Regular
—
Nickel
January 1, 1996 – December 31, 1996
Resolved
Monitoring, Regular
—
Nitrate
January 1, 1993 – December 31, 1993
Resolved

Resolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
July 1, 2024 – July 31, 2024	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
July 1, 2024 – September 30, 2024	Maximum Contaminant Level Violation, Average	TTHM	Health-based	Resolved
January 1, 2024 – January 31, 2024	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
January 1, 2024 – January 31, 2024	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
January 1, 2024 – January 31, 2024	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
July 1, 2023 – September 30, 2023	Monitoring and Reporting (DBP)	TTHM	—	Resolved
July 1, 2023 – September 30, 2023	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
May 1, 2022 – May 31, 2022	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
January 1, 2011 – October 30, 2013	Monitoring, Regular	Asbestos	—	Resolved
August 1, 2008 – August 31, 2008	Monitoring, Repeat Minor (TCR)	Coliform (TCR)	—	Resolved
September 1, 2007 – September 30, 2007	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 2004 – September 30, 2004	Monitoring and Reporting (DBP)	CARBON, TOTAL	—	Resolved
July 1, 2004 – September 30, 2004	Monitoring and Reporting (DBP)	CARBON, TOTAL	—	Resolved
July 1, 2004 – September 30, 2004	Monitoring and Reporting (DBP)	CARBON, TOTAL	—	Resolved
July 1, 2004 – September 30, 2004	Monitoring and Reporting (DBP)	CARBON, TOTAL	—	Resolved
July 1, 2004 – September 30, 2004	Monitoring and Reporting (DBP)	CARBON, TOTAL	—	Resolved
July 1, 2004 – September 30, 2004	Monitoring and Reporting (DBP)	CARBON, TOTAL	—	Resolved
January 1, 2003 – December 31, 2003	Monitoring, Regular	Barium	—	Resolved
January 1, 2003 – December 31, 2003	Monitoring, Regular	Selenium	—	Resolved
January 1, 2003 – December 31, 2003	Monitoring, Regular	Thallium, Total	—	Resolved
January 1, 2003 – December 31, 2003	Monitoring, Regular	Beryllium, Total	—	Resolved
January 1, 2003 – December 31, 2003	Monitoring, Regular	Antimony, Total	—	Resolved
January 1, 2003 – December 31, 2003	Monitoring, Regular	Nickel	—	Resolved
January 1, 2003 – December 31, 2003	Monitoring, Regular	Mercury	—	Resolved
January 1, 2003 – December 31, 2003	Monitoring, Regular	Fluoride	—	Resolved
January 1, 2003 – December 31, 2003	Monitoring, Regular	Chromium	—	Resolved
January 1, 2003 – December 31, 2003	Monitoring, Regular	Cadmium	—	Resolved
October 1, 2001 – September 21, 2005	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
June 1, 1998 – June 30, 1998	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
January 1, 1997 – December 31, 1997	Monitoring, Regular	Mercury	—	Resolved
January 1, 1997 – December 31, 1997	Monitoring, Regular	Barium	—	Resolved
January 1, 1996 – December 31, 1996	Monitoring, Regular	Nickel	—	Resolved
January 1, 1993 – December 31, 1993	Monitoring, Regular	Nitrate	—	Resolved

Resolved addressed and confirmed by the state

Enforcement actions

December 20, 2024State Public Notification requested2 linked violations
December 20, 2024State Violation/Reminder Notice1 linked violation
August 23, 2024State Public Notification received2 linked violations
August 23, 2024State Public Notification requested2 linked violations
August 23, 2024State Violation/Reminder Notice1 linked violation
March 12, 2024State Public Notification requested2 linked violations
March 12, 2024State Violation/Reminder Notice1 linked violation
March 12, 2024State Public Notification requested2 linked violations
March 12, 2024State Violation/Reminder Notice1 linked violation
March 12, 2024State Public Notification requested2 linked violations
March 12, 2024State Violation/Reminder Notice1 linked violation
October 18, 2023State Public Notification requested3 linked violations
July 8, 2022State Public Notification requested2 linked violations
June 23, 2022State Compliance achieved1 linked violation
January 24, 2014State Violation/Reminder Notice2 linked violations
October 30, 2013State Compliance achieved1 linked violation
May 15, 2009State Compliance achieved2 linked violations
December 31, 2008State Compliance achieved14 linked violations
September 17, 2008State Public Notification requested1 linked violation
September 17, 2008State Violation/Reminder Notice1 linked violation
October 24, 2007State Public Notification requested2 linked violations
February 24, 2005State Violation/Reminder Notice2 linked violations
February 24, 2005State Violation/Reminder Notice10 linked violations
April 28, 2004State Public Notification requested11 linked violations
April 28, 2004State Violation/Reminder Notice10 linked violations
April 21, 2004State Compliance achieved12 linked violations
September 24, 2001State Violation/Reminder Notice1 linked violation
September 24, 2001State Public Notification requested1 linked violation
June 19, 2001State Violation/Reminder Notice1 linked violation
June 19, 2001State Public Notification requested1 linked violation
May 14, 2001State Compliance achieved20 linked violations
May 28, 2000State Public Notification requested2 linked violations
May 28, 2000State Violation/Reminder Notice2 linked violations
December 31, 1993State Compliance achieved1 linked violation

Contact

ZENT, PAT

406-720-0153

COLSTRIP, MT 59323