CHINOOK, MT · Blaine County

CHINOOK 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): MT0000174
System type: Community Water System
Population served: 1,300
Service connections: 807
Ownership: local government
Water source: surface water (rivers, lakes, or reservoirs)

Violation history

Maximum Contaminant Level Violation, Average
Health-based
Total Haloacetic Acids (HAA5)
October 1, 2025 – December 11, 2025
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Total Haloacetic Acids (HAA5)
July 1, 2025 – September 16, 2025
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Total Haloacetic Acids (HAA5)
April 1, 2025 – June 3, 2025
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Total Haloacetic Acids (HAA5)
January 1, 2025 – March 28, 2025
Resolved
Monitoring, Repeat Minor (TCR)
—
Coliform (TCR)
October 1, 2014 – October 31, 2014
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Total Haloacetic Acids (HAA5)
April 1, 2011 – June 30, 2011
Resolved
Monitoring, Regular
—
Fluoride
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Fluoride
January 1, 2003 – December 31, 2003
Resolved
Monitoring, Regular
—
Arsenic
January 1, 2002 – December 31, 2002
Resolved
Maximum Contaminant Level Violation, Single Sample
Health-based
DICHLOROMETHANE
January 1, 2000 – December 31, 2000
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
January 1, 1999 – January 31, 1999
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
November 1, 1997 – November 30, 1997
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
August 1, 1997 – August 31, 1997
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
June 1, 1995 – June 30, 1995
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
May 1, 1995 – May 31, 1995
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
April 1, 1995 – April 30, 1995
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
February 1, 1995 – February 28, 1995
Resolved
Monitoring, Regular
—
Antimony, Total
January 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
Nickel
January 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
Nitrate
January 1, 1993 – December 31, 1993
Resolved
Monitoring, Regular
—
o-Dichlorobenzene
January 1, 1993 – December 31, 1993
Resolved

Resolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
October 1, 2025 – December 11, 2025	Maximum Contaminant Level Violation, Average	Total Haloacetic Acids (HAA5)	Health-based	Resolved
July 1, 2025 – September 16, 2025	Maximum Contaminant Level Violation, Average	Total Haloacetic Acids (HAA5)	Health-based	Resolved
April 1, 2025 – June 3, 2025	Maximum Contaminant Level Violation, Average	Total Haloacetic Acids (HAA5)	Health-based	Resolved
January 1, 2025 – March 28, 2025	Maximum Contaminant Level Violation, Average	Total Haloacetic Acids (HAA5)	Health-based	Resolved
October 1, 2014 – October 31, 2014	Monitoring, Repeat Minor (TCR)	Coliform (TCR)	—	Resolved
April 1, 2011 – June 30, 2011	Maximum Contaminant Level Violation, Average	Total Haloacetic Acids (HAA5)	Health-based	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Fluoride	—	Resolved
January 1, 2003 – December 31, 2003	Monitoring, Regular	Fluoride	—	Resolved
January 1, 2002 – December 31, 2002	Monitoring, Regular	Arsenic	—	Resolved
January 1, 2000 – December 31, 2000	Maximum Contaminant Level Violation, Single Sample	DICHLOROMETHANE	Health-based	Resolved
January 1, 1999 – January 31, 1999	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
November 1, 1997 – November 30, 1997	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
August 1, 1997 – August 31, 1997	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
June 1, 1995 – June 30, 1995	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
May 1, 1995 – May 31, 1995	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
April 1, 1995 – April 30, 1995	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
February 1, 1995 – February 28, 1995	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
January 1, 1994 – December 31, 1994	Monitoring, Regular	Antimony, Total	—	Resolved
January 1, 1994 – December 31, 1994	Monitoring, Regular	Nickel	—	Resolved
January 1, 1993 – December 31, 1993	Monitoring, Regular	Nitrate	—	Resolved
January 1, 1993 – December 31, 1993	Monitoring, Regular	o-Dichlorobenzene	—	Resolved

Resolved addressed and confirmed by the state

Enforcement actions

December 11, 2025State Violation/Reminder Notice1 linked violation
December 11, 2025State Compliance achieved1 linked violation
December 11, 2025State Public Notification requested1 linked violation
November 5, 2025State Public Notification received1 linked violation
September 16, 2025State Violation/Reminder Notice1 linked violation
September 16, 2025State Compliance achieved1 linked violation
September 16, 2025State Public Notification requested1 linked violation
June 3, 2025State Public Notification requested1 linked violation
June 3, 2025State Compliance achieved1 linked violation
June 3, 2025State Violation/Reminder Notice1 linked violation
March 28, 2025State Public Notification requested1 linked violation
March 28, 2025State Compliance achieved1 linked violation
March 28, 2025State Violation/Reminder Notice1 linked violation
November 17, 2014State Violation/Reminder Notice1 linked violation
November 17, 2014State Public Notification requested1 linked violation
November 3, 2014State Compliance achieved1 linked violation
December 12, 2011State Public Notification received1 linked violation
October 26, 2011State Compliance achieved1 linked violation
July 19, 2011State Violation/Reminder Notice1 linked violation
July 19, 2011State Public Notification requested1 linked violation
December 31, 2008State Compliance achieved2 linked violations
July 22, 2005State Public Notification requested1 linked violation
July 22, 2005State Violation/Reminder Notice1 linked violation
April 13, 2005State Public Notification requested1 linked violation
April 13, 2005State Violation/Reminder Notice1 linked violation
April 6, 2005State Compliance achieved1 linked violation
November 4, 2004State Compliance achieved1 linked violation
March 26, 2004State Public Notification requested1 linked violation
March 26, 2004State Violation/Reminder Notice1 linked violation
December 31, 1999State Compliance achieved10 linked violations
December 31, 1999State Public Notification requested2 linked violations
December 31, 1998State Public Notification requested1 linked violation
December 31, 1998State Public Notification requested1 linked violation
December 31, 1998State Public Notification requested1 linked violation
December 31, 1997State Public Notification requested1 linked violation
March 14, 1994State Violation/Reminder Notice5 linked violations

Contact

DUNKIN, RHIANNON

406-357-3160

CHINOOK, MT 59532