Is CHINOOK CITY OF required to publish a Consumer Confidence Report?

Yes. CHINOOK CITY OF is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.

When is CHINOOK CITY OF’s next Consumer Confidence Report due?

CHINOOK CITY OF’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

What is a Consumer Confidence Report?

A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

CHINOOK, MT · Blaine County

CHINOOK CITY OF Water System

Consumer Confidence Report status

CHINOOK CITY OF must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.

As of August 1, 2026, EPA's federal records show no open violations for CHINOOK CITY OF.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 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)

CHINOOK CITY OF is one of 123 community water systems in Montana in the 501 to 3,300 people size category, serving 1,300 people from surface water.

As of August 1, 2026, its federal record holds 19 entries between 1993 and 2025, all of which EPA lists as closed.

Of the 19, 8 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves inorganic chemicals, the Surface Water Treatment Rules, and the Stage 2 Disinfectants and Disinfection Byproducts Rule.

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
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
February 1, 1995 – February 28, 1995
Resolved
Monitoring, Regular
—
Antimony, Total
January 1, 1994 – December 31, 1994
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
January 1, 1994 – January 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
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
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 – January 31, 1994	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	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 Public Notification requested1 linked violation
July 19, 2011State Violation/Reminder Notice1 linked violation
December 31, 2008State Compliance achieved2 linked violations
September 26, 2005State Compliance achieved9 linked violations
July 22, 2005State Violation/Reminder Notice1 linked violation
July 22, 2005State Public Notification requested1 linked violation
April 13, 2005State Violation/Reminder Notice1 linked violation
April 13, 2005State Public Notification requested1 linked violation
April 6, 2005State Compliance achieved1 linked violation
November 4, 2004State Compliance achieved1 linked violation
March 26, 2004State Violation/Reminder Notice1 linked violation
March 26, 2004State Public Notification requested1 linked violation
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

Common questions

Is CHINOOK CITY OF required to publish a Consumer Confidence Report?: Yes. CHINOOK CITY OF is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is CHINOOK CITY OF’s next Consumer Confidence Report due?: CHINOOK CITY OF’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does CHINOOK CITY OF have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for CHINOOK CITY OF.
What is a Consumer Confidence Report?: A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

Contact

DUNKIN, RHIANNON

406-357-3160

CHINOOK, MT 59532