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

Yes. HAMILTON 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 HAMILTON CITY OF’s next Consumer Confidence Report due?

HAMILTON 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.

HAMILTON, MT · Ravalli County

HAMILTON CITY OF Water System

Consumer Confidence Report status

HAMILTON 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 HAMILTON 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): MT0000234
System type: Community Water System
Population served: 5,660
Service connections: 2,443
Ownership: local government
Water source: groundwater (wells)

HAMILTON CITY OF is among the 23 largest community water systems in Montana, serving 5,660 people from groundwater.

As of August 1, 2026, its federal record holds 6 entries between 1993 and 2017, all of which EPA lists as closed. Nothing has been added since 2017.

All 6 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 Lead and Copper Rule, and the Total Coliform Rules.

Violation history

Lead Consumer Notice
—
Lead and Copper Rule
December 30, 2017 – October 19, 2020
Resolved
Monitoring, Regular
—
Nitrate-Nitrite
January 1, 2012 – March 12, 2012
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
December 1, 2011 – December 31, 2011
Resolved
Initial Tap Sampling for Pb and Cu
—
Lead and Copper Rule
July 1, 2001 – February 4, 2004
Resolved
Monitoring, Regular
—
Nitrate
January 1, 1994 – December 31, 1994
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
December 30, 2017 – October 19, 2020	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
January 1, 2012 – March 12, 2012	Monitoring, Regular	Nitrate-Nitrite	—	Resolved
December 1, 2011 – December 31, 2011	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
July 1, 2001 – February 4, 2004	Initial Tap Sampling for Pb and Cu	Lead and Copper Rule	—	Resolved
January 1, 1994 – December 31, 1994	Monitoring, Regular	Nitrate	—	Resolved
January 1, 1993 – December 31, 1993	Monitoring, Regular	Nitrate	—	Resolved

Resolved addressed and confirmed by the state

Enforcement actions

October 19, 2020State Compliance achieved1 linked violation
January 31, 2018State Violation/Reminder Notice1 linked violation
January 18, 2013State Violation/Reminder Notice1 linked violation
January 18, 2013State Public Notification requested1 linked violation
March 12, 2012State Compliance achieved1 linked violation
February 3, 2012State Compliance achieved1 linked violation
January 27, 2012State Violation/Reminder Notice1 linked violation
January 27, 2012State Public Notification requested1 linked violation
May 15, 2001State Compliance achieved1 linked violation

Common questions

Is HAMILTON CITY OF required to publish a Consumer Confidence Report?: Yes. HAMILTON 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 HAMILTON CITY OF’s next Consumer Confidence Report due?: HAMILTON CITY OF’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does HAMILTON CITY OF have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for HAMILTON 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

LEWIS, STEPHANIE

406-363-6717

HAMILTON, MT 59840