Drinking Water Compliance OS

HARLEM, MT · Blaine County

HARLEM CITY OF Water System

Current status

1 open health-based violation on record as of July 4, 2026, alongside 1 other open item(s). See the violation history below for contaminant and status details.

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)
MT0000239
System type
Community Water System
Population served
820
Service connections
375
Ownership
local government
Water source
surface water (rivers, lakes, or reservoirs)

Violation history

  • Consumer Confidence Report Inadequate Reporting

    Consumer Confidence Rule

    October 1, 2025 – October 6, 2025

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    October 1, 2025 – December 31, 2025

    Archived
  • Treatment Technique, Level 1 Assessment (RTCR)

    Health-based

    Revised Total Coliform Rule

    August 26, 2025

    Unaddressed
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    July 1, 2025 – September 30, 2025

    Archived
  • Monitoring and Reporting (DBP)

    Total Haloacetic Acids (HAA5)

    April 1, 2025 – June 30, 2025

    Resolved
  • Monitoring and Reporting (DBP)

    TTHM

    April 1, 2025 – June 30, 2025

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    January 1, 2025 – March 31, 2025

    Archived
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    November 1, 2024 – November 30, 2024

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Total Haloacetic Acids (HAA5)

    October 1, 2024 – December 31, 2024

    Archived
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    October 1, 2024 – December 31, 2024

    Archived
  • Follow-up Or Routine LCR Tap M/R

    Lead and Copper Rule

    October 1, 2024

    Unaddressed
  • Maximum Contaminant Level Violation, Average

    Health-based

    Total Haloacetic Acids (HAA5)

    July 1, 2024 – September 30, 2024

    Archived
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    July 1, 2024 – September 30, 2024

    Archived
  • Failure to Filter (SWTR)

    Health-based

    Long Term 2 Enhanced Surface Water Treatment Rule

    July 1, 2024 – August 30, 2024

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    April 1, 2024 – June 30, 2024

    Archived
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    January 1, 2024 – March 31, 2024

    Archived
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    October 1, 2023 – December 31, 2023

    Archived
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    July 1, 2023 – September 30, 2023

    Archived
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    April 1, 2023 – June 30, 2023

    Archived
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    January 1, 2023 – March 31, 2023

    Archived
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    November 1, 2022 – November 30, 2022

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    October 1, 2022 – December 31, 2022

    Archived
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    July 1, 2022 – September 30, 2022

    Archived
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2022 – August 19, 2022

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    April 1, 2022 – June 30, 2022

    Archived
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    January 1, 2022 – March 31, 2022

    Archived
  • Lead Consumer Notice

    Lead and Copper Rule

    December 30, 2021 – January 4, 2022

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    October 1, 2021 – December 31, 2021

    Archived
  • Consumer Confidence Report Inadequate Reporting

    Consumer Confidence Rule

    October 1, 2021 – July 18, 2022

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    July 1, 2021 – September 30, 2021

    Archived
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2021 – August 19, 2022

    Resolved
  • Monitoring, Regular

    cis-1,2-Dichloroethylene

    January 1, 2021 – December 31, 2021

    Resolved
  • Monitoring, Regular

    Styrene

    January 1, 2021 – December 31, 2021

    Resolved
  • Monitoring, Regular

    Ethylbenzene

    January 1, 2021 – December 31, 2021

    Resolved
  • Monitoring, Regular

    Toluene

    January 1, 2021 – December 31, 2021

    Resolved
  • Monitoring, Regular

    Benzene

    January 1, 2021 – December 31, 2021

    Resolved
  • Monitoring, Regular

    CHLOROBENZENE

    January 1, 2021 – December 31, 2021

    Resolved
  • Monitoring, Regular

    Tetrachloroethylene

    January 1, 2021 – December 31, 2021

    Resolved
  • Monitoring, Regular

    1,1,2-Trichloroethane

    January 1, 2021 – December 31, 2021

    Resolved
  • Monitoring, Regular

    Trichloroethylene

    January 1, 2021 – December 31, 2021

    Resolved
  • Monitoring, Regular

    1,2-Dichloropropane

    January 1, 2021 – December 31, 2021

    Resolved
  • Monitoring, Regular

    Carbon tetrachloride

    January 1, 2021 – December 31, 2021

    Resolved
  • Monitoring, Regular

    1,1,1-Trichloroethane

    January 1, 2021 – December 31, 2021

    Resolved
  • Monitoring, Regular

    1,2-Dichloroethane

    January 1, 2021 – December 31, 2021

    Resolved
  • Monitoring, Regular

    trans-1,2-Dichloroethylene

    January 1, 2021 – December 31, 2021

    Resolved
  • Monitoring, Regular

    1,1-Dichloroethylene

    January 1, 2021 – December 31, 2021

    Resolved
  • Monitoring, Regular

    Vinyl chloride

    January 1, 2021 – December 31, 2021

    Resolved
  • Monitoring, Regular

    p-Dichlorobenzene

    January 1, 2021 – December 31, 2021

    Resolved
  • Monitoring, Regular

    o-Dichlorobenzene

    January 1, 2021 – December 31, 2021

    Resolved
  • Monitoring, Regular

    Xylenes, Total

    January 1, 2021 – December 31, 2021

    Resolved
  • Monitoring, Regular

    1,2,4-Trichlorobenzene

    January 1, 2021 – December 31, 2021

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    January 1, 2021 – March 31, 2021

    Archived
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    October 1, 2020 – December 31, 2020

    Archived
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    September 1, 2020 – September 30, 2020

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    January 1, 2020 – March 31, 2020

    Archived
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    October 1, 2019 – December 31, 2019

    Archived
  • Consumer Confidence Report Inadequate Reporting

    Consumer Confidence Rule

    October 1, 2019 – October 31, 2019

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    July 1, 2019 – September 30, 2019

    Archived
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2019 – October 31, 2019

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    April 1, 2019 – June 30, 2019

    Archived
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    January 1, 2019 – March 31, 2019

    Archived
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    October 1, 2018 – December 31, 2018

    Archived
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    July 1, 2018 – September 30, 2018

    Archived
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    April 1, 2018 – June 30, 2018

    Archived
  • Consumer Confidence Report Inadequate Reporting

    Consumer Confidence Rule

    October 1, 2017 – July 18, 2022

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    October 1, 2017 – December 31, 2017

    Archived
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    October 1, 2017 – October 31, 2017

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    August 1, 2017 – August 31, 2017

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2017 – August 19, 2022

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    July 1, 2017 – September 30, 2017

    Archived
  • Monitoring and Reporting (DBP)

    Total Haloacetic Acids (HAA5)

    July 1, 2017 – September 30, 2017

    Resolved
  • Monitoring and Reporting (DBP)

    TTHM

    July 1, 2017 – September 30, 2017

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    June 1, 2017 – June 30, 2017

    Resolved
  • Monitoring and Reporting (DBP)

    TTHM

    April 1, 2017 – June 30, 2017

    Resolved
  • Monitoring and Reporting (DBP)

    Total Haloacetic Acids (HAA5)

    April 1, 2017 – June 30, 2017

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    April 1, 2017 – June 30, 2017

    Archived
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    January 1, 2017 – March 31, 2017

    Archived
  • Monitoring and Reporting (DBP)

    Total Haloacetic Acids (HAA5)

    October 1, 2016 – December 31, 2016

    Resolved
  • Monitoring and Reporting (DBP)

    TTHM

    October 1, 2016 – December 31, 2016

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    September 1, 2016 – September 30, 2016

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    July 1, 2016 – September 30, 2016

    Archived
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    April 1, 2016 – June 30, 2016

    Archived
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    January 1, 2016 – March 31, 2016

    Archived
  • Monitoring, Regular

    Arsenic

    January 1, 2016 – December 31, 2016

    Resolved
  • Monitoring, Regular

    Nitrate-Nitrite

    January 1, 2016 – December 31, 2016

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    January 1, 2016 – January 31, 2016

    Resolved
  • Lead Consumer Notice

    Lead and Copper Rule

    December 30, 2015 – February 1, 2016

    Resolved
  • Monitoring and Reporting (DBP)

    TTHM

    October 1, 2015 – December 31, 2015

    Resolved
  • Monitoring and Reporting (DBP)

    Total Haloacetic Acids (HAA5)

    October 1, 2015 – December 31, 2015

    Resolved
  • Consumer Confidence Report Inadequate Reporting

    Consumer Confidence Rule

    October 1, 2015 – February 10, 2016

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    July 1, 2015 – September 30, 2015

    Archived
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2015 – February 10, 2016

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Total Haloacetic Acids (HAA5)

    April 1, 2015 – June 30, 2015

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    April 1, 2015 – June 30, 2015

    Archived
  • Maximum Contaminant Level Violation, Average

    Health-based

    Total Haloacetic Acids (HAA5)

    January 1, 2015 – March 31, 2015

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    January 1, 2015 – March 31, 2015

    Archived
  • Monitoring of Treatment (SWTR-Filter)

    Long Term 2 Enhanced Surface Water Treatment Rule

    December 1, 2014 – December 31, 2014

    Resolved
  • Monitoring of Treatment (SWTR-Filter)

    Surface Water Treatment Rule

    December 1, 2014 – December 31, 2014

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Total Haloacetic Acids (HAA5)

    October 1, 2014 – December 31, 2014

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    October 1, 2014 – December 31, 2014

    Archived
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    September 1, 2014 – September 30, 2014

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Total Haloacetic Acids (HAA5)

    July 1, 2014 – September 30, 2014

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    July 1, 2014 – September 30, 2014

    Archived
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2013 – August 5, 2013

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    July 1, 2013 – September 30, 2013

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    April 1, 2013 – June 30, 2013

    Resolved
  • Lead Consumer Notice

    Lead and Copper Rule

    January 1, 2013 – February 6, 2013

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Total Haloacetic Acids (HAA5)

    July 1, 2012 – September 30, 2012

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Total Haloacetic Acids (HAA5)

    April 1, 2012 – June 30, 2012

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    April 1, 2012 – June 30, 2012

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Total Haloacetic Acids (HAA5)

    January 1, 2012 – March 31, 2012

    Resolved
  • Monitoring and Reporting (DBP)

    Total Haloacetic Acids (HAA5)

    January 1, 2012 – March 31, 2012

    Resolved
  • Monitoring and Reporting (DBP)

    TTHM

    January 1, 2012 – March 31, 2012

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    January 1, 2012 – March 31, 2012

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Total Haloacetic Acids (HAA5)

    October 1, 2011 – December 31, 2011

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    October 1, 2011 – December 31, 2011

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Total Haloacetic Acids (HAA5)

    July 1, 2011 – September 30, 2011

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    July 1, 2011 – September 30, 2011

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2011 – August 18, 2011

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Total Haloacetic Acids (HAA5)

    April 1, 2011 – June 30, 2011

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    April 1, 2011 – June 30, 2011

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Total Haloacetic Acids (HAA5)

    January 1, 2011 – March 31, 2011

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    January 1, 2011 – March 31, 2011

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Total Haloacetic Acids (HAA5)

    October 1, 2010 – December 31, 2010

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    October 1, 2010 – December 31, 2010

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Total Haloacetic Acids (HAA5)

    July 1, 2010 – September 30, 2010

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    July 1, 2010 – September 30, 2010

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    TTHM

    July 1, 2009 – September 30, 2009

    Resolved
  • Monitoring and Reporting (DBP)

    CARBON, TOTAL

    October 1, 2004 – December 31, 2004

    Resolved
  • Monitoring and Reporting (DBP)

    CARBON, TOTAL

    October 1, 2004 – December 31, 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

    April 1, 2004 – June 30, 2004

    Resolved
  • Monitoring and Reporting (DBP)

    CARBON, TOTAL

    January 1, 2004 – March 31, 2004

    Resolved
  • Monitoring and Reporting (DBP)

    CARBON, TOTAL

    January 1, 2004 – March 31, 2004

    Resolved
  • Monitoring and Reporting (DBP)

    CARBON, TOTAL

    January 1, 2004 – March 31, 2004

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 1997 – December 31, 1997

    Resolved
  • Monitoring, Regular

    Nickel

    January 1, 1994 – December 31, 1994

    Resolved
  • Monitoring, Regular

    Arsenic

    January 1, 1994 – December 31, 1994

    Resolved
  • Monitoring, Regular

    Barium

    January 1, 1994 – December 31, 1994

    Resolved
  • Monitoring, Regular

    Cadmium

    January 1, 1994 – December 31, 1994

    Resolved
  • Monitoring, Regular

    Chromium

    January 1, 1994 – December 31, 1994

    Resolved
  • Monitoring, Regular

    Mercury

    January 1, 1994 – December 31, 1994

    Resolved
  • Monitoring, Regular

    Selenium

    January 1, 1994 – December 31, 1994

    Resolved
  • Monitoring, Regular

    Fluoride

    January 1, 1994 – December 31, 1994

    Resolved
  • Monitoring, Regular

    Antimony, Total

    January 1, 1994 – December 31, 1994

    Resolved
  • Monitoring, Regular

    Beryllium, Total

    January 1, 1994 – December 31, 1994

    Resolved
  • Monitoring, Regular

    CYANIDE

    January 1, 1994 – December 31, 1994

    Resolved
  • Monitoring, Regular

    Thallium, Total

    January 1, 1994 – December 31, 1994

    Resolved

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)Unaddressed no corrective action on record yet

Enforcement actions

Contact

GREEN, CHRIS

406-353-2361

HARLEM, MT 59526