Drinking Water Compliance OS

EAST HELENA, MT · Lewis and Clark County

MCDONALD TRAILER CT 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)
MT0000402
System type
Community Water System
Population served
75
Service connections
24
Ownership
privately owned
Water source
groundwater (wells)

Violation history

  • Monitoring, Regular

    Nitrate-Nitrite

    January 1, 2025 – December 31, 2025

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    December 1, 2024 – December 31, 2024

    Resolved
  • Consumer Confidence Report Inadequate Reporting

    Consumer Confidence Rule

    October 1, 2024 – December 13, 2024

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    September 1, 2024 – September 30, 2024

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2024 – November 8, 2024

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    May 1, 2024 – May 31, 2024

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    March 1, 2024 – March 31, 2024

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    February 1, 2024 – February 29, 2024

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    December 1, 2023 – December 31, 2023

    Resolved
  • Consumer Confidence Report Inadequate Reporting

    Consumer Confidence Rule

    October 1, 2023 – December 13, 2024

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    August 1, 2023 – August 31, 2023

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2023 – November 8, 2024

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    July 1, 2023 – July 31, 2023

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    June 1, 2023 – June 30, 2023

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    May 1, 2023 – May 31, 2023

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    February 1, 2023 – February 28, 2023

    Archived
  • Monitoring, Regular

    Nitrate-Nitrite

    January 1, 2023 – December 31, 2023

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    January 1, 2023 – January 31, 2023

    Archived
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    June 1, 2022 – June 30, 2022

    Archived
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    December 1, 2021 – December 31, 2021

    Archived
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    October 1, 2021 – October 31, 2021

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    July 1, 2021 – July 31, 2021

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    June 1, 2021 – June 30, 2021

    Resolved
  • Treatment Technique, Level 1 Assessment (RTCR)

    Health-based

    Revised Total Coliform Rule

    February 17, 2021 – June 6, 2022

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    February 1, 2021 – February 28, 2021

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    September 1, 2020 – September 30, 2020

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2020 – July 29, 2020

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    December 1, 2019 – December 31, 2019

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    August 1, 2018 – August 31, 2018

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2018 – October 25, 2018

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    November 1, 2017 – November 30, 2017

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    October 1, 2017 – October 31, 2017

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2017 – September 11, 2017

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    July 1, 2017 – July 31, 2017

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    February 1, 2017 – February 28, 2017

    Resolved
  • Monitoring, Regular

    Combined Radium (-226 and -228)

    January 1, 2017 – December 31, 2022

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    October 1, 2016 – October 31, 2016

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    April 1, 2016 – April 30, 2016

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

    Lead and Copper Rule

    October 1, 2015 – October 19, 2015

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    October 1, 2015 – October 31, 2015

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    June 1, 2015 – June 30, 2015

    Resolved
  • Monitoring, Regular

    Toluene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    Benzene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    CHLOROBENZENE

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    Tetrachloroethylene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    1,1,2-Trichloroethane

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    Trichloroethylene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    1,2-Dichloropropane

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    Carbon tetrachloride

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    1,1,1-Trichloroethane

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    1,2-Dichloroethane

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    1,1-Dichloroethylene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    DICHLOROMETHANE

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    Xylenes, Total

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    cis-1,2-Dichloroethylene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    1,2,4-Trichlorobenzene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    Combined Radium (-226 and -228)

    January 1, 2015 – March 31, 2015

    Resolved
  • Monitoring, Regular

    Gross Alpha, Excl. Radon and U

    January 1, 2015 – March 31, 2015

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    January 1, 2015 – January 31, 2015

    Resolved
  • Monitoring, Regular

    p-Dichlorobenzene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    Vinyl chloride

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    o-Dichlorobenzene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    Styrene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    Ethylbenzene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    Toluene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    Benzene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    CHLOROBENZENE

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    Tetrachloroethylene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    Trichloroethylene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    Carbon tetrachloride

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    1,1,1-Trichloroethane

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    trans-1,2-Dichloroethylene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    1,1-Dichloroethylene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    Vinyl chloride

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    p-Dichlorobenzene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    o-Dichlorobenzene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    DICHLOROMETHANE

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    Xylenes, Total

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    cis-1,2-Dichloroethylene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    1,2,4-Trichlorobenzene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    Styrene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    Ethylbenzene

    January 1, 2015 – December 31, 2015

    Resolved
  • Monitoring, Regular

    Benzo(a)pyrene

    October 1, 2014 – December 30, 2014

    Resolved
  • Monitoring, Regular

    Methoxychlor

    October 1, 2014 – December 30, 2014

    Resolved
  • Monitoring, Regular

    Toxaphene

    October 1, 2014 – December 30, 2014

    Resolved
  • Monitoring, Regular

    Dalapon

    October 1, 2014 – December 30, 2014

    Resolved
  • Monitoring, Regular

    OXAMYL

    October 1, 2014 – December 30, 2014

    Resolved
  • Monitoring, Regular

    Dinoseb

    October 1, 2014 – December 30, 2014

    Resolved
  • Monitoring, Regular

    Hexachlorocyclopentadiene

    October 1, 2014 – December 30, 2014

    Resolved
  • Monitoring, Regular

    Aldicarb sulfoxide

    October 1, 2014 – December 30, 2014

    Resolved
  • Monitoring, Regular

    Aldicarb sulfone

    October 1, 2014 – December 30, 2014

    Resolved
  • Monitoring, Regular

    Carbofuran

    October 1, 2014 – December 30, 2014

    Resolved
  • Monitoring, Regular

    Aldicarb

    October 1, 2014 – December 30, 2014

    Resolved
  • Monitoring, Regular

    Atrazine

    October 1, 2014 – December 30, 2014

    Resolved
  • Monitoring, Regular

    LASSO

    October 1, 2014 – December 30, 2014

    Resolved
  • Monitoring, Regular

    Heptachlor

    October 1, 2014 – December 30, 2014

    Resolved
  • Monitoring, Regular

    2,4-D

    October 1, 2014 – December 30, 2014

    Resolved
  • Monitoring, Regular

    2,4,5-TP

    October 1, 2014 – December 30, 2014

    Resolved
  • Monitoring, Regular

    HEXACHLOROBENZENE

    October 1, 2014 – December 30, 2014

    Resolved
  • Monitoring, Regular

    Pentachlorophenol

    October 1, 2014 – December 30, 2014

    Resolved
  • Monitoring, Regular

    Chlordane

    October 1, 2014 – December 30, 2014

    Resolved
  • Monitoring, Regular

    Gross Alpha, Excl. Radon and U

    October 1, 2014 – December 30, 2014

    Resolved
  • Monitoring, Regular

    Gross Alpha, Excl. Radon and U

    July 1, 2014 – September 30, 2014

    Resolved
  • Monitoring, Regular

    Pentachlorophenol

    July 1, 2014 – September 30, 2014

    Resolved
  • Monitoring, Regular

    Benzo(a)pyrene

    July 1, 2014 – September 30, 2014

    Resolved
  • Monitoring, Regular

    2,4-D

    July 1, 2014 – September 30, 2014

    Resolved
  • Monitoring, Regular

    Heptachlor

    July 1, 2014 – September 30, 2014

    Resolved
  • Monitoring, Regular

    LASSO

    July 1, 2014 – September 30, 2014

    Resolved
  • Monitoring, Regular

    Atrazine

    July 1, 2014 – September 30, 2014

    Resolved
  • Monitoring, Regular

    Aldicarb

    July 1, 2014 – September 30, 2014

    Resolved
  • Monitoring, Regular

    Carbofuran

    July 1, 2014 – September 30, 2014

    Resolved
  • Monitoring, Regular

    Aldicarb sulfone

    July 1, 2014 – September 30, 2014

    Resolved
  • Monitoring, Regular

    Hexachlorocyclopentadiene

    July 1, 2014 – September 30, 2014

    Resolved
  • Monitoring, Regular

    Picloram

    July 1, 2014 – September 30, 2014

    Resolved
  • Monitoring, Regular

    Di(2-ethylhexyl) phthalate

    July 1, 2014 – September 30, 2014

    Resolved
  • Monitoring, Regular

    Simazine

    July 1, 2014 – September 30, 2014

    Resolved
  • Monitoring, Regular

    OXAMYL

    July 1, 2014 – September 30, 2014

    Resolved
  • Monitoring, Regular

    Di(2-ethylhexyl) adipate

    July 1, 2014 – September 30, 2014

    Resolved
  • Monitoring, Regular

    Dalapon

    July 1, 2014 – September 30, 2014

    Resolved
  • Monitoring, Regular

    Toxaphene

    July 1, 2014 – September 30, 2014

    Resolved
  • Monitoring, Regular

    Methoxychlor

    July 1, 2014 – September 30, 2014

    Resolved
  • Monitoring, Regular

    BHC-GAMMA

    July 1, 2014 – September 30, 2014

    Resolved
  • Monitoring, Regular

    Endrin

    July 1, 2014 – September 30, 2014

    Resolved
  • Monitoring, Regular

    2,4,5-TP

    April 1, 2014 – June 30, 2014

    Resolved
  • Monitoring, Regular

    Gross Alpha, Excl. Radon and U

    April 1, 2014 – June 30, 2014

    Resolved
  • Monitoring, Regular

    Chlordane

    April 1, 2014 – June 30, 2014

    Resolved
  • Monitoring, Regular

    Pentachlorophenol

    April 1, 2014 – June 30, 2014

    Resolved
  • Monitoring, Regular

    Benzo(a)pyrene

    April 1, 2014 – June 30, 2014

    Resolved
  • Monitoring, Regular

    HEXACHLOROBENZENE

    April 1, 2014 – June 30, 2014

    Resolved
  • Monitoring, Regular

    2,4-D

    April 1, 2014 – June 30, 2014

    Resolved
  • Monitoring, Regular

    Heptachlor

    April 1, 2014 – June 30, 2014

    Resolved
  • Monitoring, Regular

    LASSO

    April 1, 2014 – June 30, 2014

    Resolved
  • Monitoring, Regular

    Atrazine

    April 1, 2014 – June 30, 2014

    Resolved
  • Monitoring, Regular

    Aldicarb

    April 1, 2014 – June 30, 2014

    Resolved
  • Monitoring, Regular

    Carbofuran

    April 1, 2014 – June 30, 2014

    Resolved
  • Monitoring, Regular

    Aldicarb sulfone

    April 1, 2014 – June 30, 2014

    Resolved
  • Monitoring, Regular

    Aldicarb sulfoxide

    April 1, 2014 – June 30, 2014

    Resolved
  • Monitoring, Regular

    Picloram

    April 1, 2014 – June 30, 2014

    Resolved
  • Monitoring, Regular

    OXAMYL

    April 1, 2014 – June 30, 2014

    Resolved
  • Monitoring, Regular

    Di(2-ethylhexyl) adipate

    April 1, 2014 – June 30, 2014

    Resolved
  • Monitoring, Regular

    Methoxychlor

    April 1, 2014 – June 30, 2014

    Resolved
  • Monitoring, Regular

    BHC-GAMMA

    April 1, 2014 – June 30, 2014

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    September 1, 2013 – September 30, 2013

    Resolved
  • Lead Consumer Notice

    Lead and Copper Rule

    January 1, 2013 – January 28, 2013

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    May 1, 2012 – May 31, 2012

    Resolved
  • Monitoring, Regular

    Asbestos

    January 1, 2011 – December 31, 2013

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    May 1, 2008 – May 31, 2008

    Resolved
  • Monitoring, Regular

    Toxaphene

    January 1, 2008 – December 30, 2010

    Resolved
  • Monitoring, Regular

    Antimony, Total

    January 1, 2008 – December 30, 2010

    Resolved
  • Monitoring, Regular

    Ethylbenzene

    January 1, 2008 – December 30, 2010

    Resolved
  • Monitoring, Regular

    Benzene

    January 1, 2008 – December 30, 2010

    Resolved
  • Monitoring, Regular

    Carbon tetrachloride

    January 1, 2008 – December 30, 2010

    Resolved
  • Monitoring, Regular

    HEXACHLOROBENZENE

    January 1, 2008 – December 30, 2010

    Resolved
  • Monitoring, Regular

    Aldicarb

    January 1, 2008 – December 30, 2010

    Resolved
  • Monitoring, Regular

    Aldicarb sulfoxide

    January 1, 2008 – December 30, 2010

    Resolved
  • Monitoring, Regular

    Simazine

    January 1, 2008 – December 30, 2010

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

    Lead and Copper Rule

    October 1, 2007 – September 30, 2009

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2007 – August 25, 2008

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2006 – March 8, 2007

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    December 1, 2005 – December 31, 2005

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    January 1, 2005 – January 31, 2005

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

    Lead and Copper Rule

    October 1, 2004 – September 30, 2009

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    July 1, 2004 – July 31, 2004

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    March 1, 2004 – March 31, 2004

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    August 1, 2002 – August 31, 2002

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    January 1, 2002 – January 31, 2002

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    June 1, 2001 – June 30, 2001

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    March 1, 2001 – March 31, 2001

    Resolved
  • Monitoring, Regular

    Nitrate-Nitrite

    January 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Arsenic

    January 1, 1999 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Arsenic

    January 1, 1999 – December 31, 2001

    Resolved
  • Monitoring, Repeat Minor (TCR)

    Coliform (TCR)

    August 1, 1994 – August 31, 1994

    Resolved
  • Monitoring, Regular

    Nitrate

    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)

Enforcement actions

Contact

MASON, HEATH

406-227-6433

EAST HELENA, MT 59635