DUNCAN RANCH COLONY
Montana - Community Water System - PWSID: MT0000418
System Information
| PWSID | MT0000418 |
| System Name | DUNCAN RANCH COLONY |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Private |
| EPA Region | 08 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Feb 13, 1979 |
| Last Reported | Mar 26, 2026 |
Location & Contact
| State | Montana |
| City | HARLOWTON |
| ZIP Code | 59036 |
| Address | 12 DUNCAN COLONY LN |
| Organization | WALDNER, JEFFREY I |
| Phone | 406-380-2933 |
Population & Service
| Population Served | 96 |
| Service Connections | 17 |
Drinking Water Violations (252)
This water system has 252 violations recorded in the EPA SDWIS database.
| Begin Date | End Date | Contaminant | Category | Health-Based | Major | Measured | Federal MCL | State MCL | Status | Return to Compliance | Rule |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dec 30, 2021 | - | MR | No | No | - | TT | - | Resolved | Jan 24, 2022 | - | |
| Dec 30, 2021 | - | MR | No | No | - | TT | - | Resolved | Jan 24, 2022 | - | |
| Jun 1, 2021 | Jun 30, 2021 | MON | No | Yes | - | - | - | Resolved | Jun 30, 2021 | - | |
| Jun 1, 2021 | Jun 30, 2021 | MON | No | Yes | - | - | - | Resolved | Jun 30, 2021 | - | |
| Jun 1, 2021 | Jun 30, 2021 | MON | No | Yes | - | - | - | Resolved | Jun 30, 2021 | - | |
| Jul 1, 2019 | - | Other | No | No | - | - | - | Resolved | Aug 5, 2019 | - | |
| Jul 1, 2019 | - | Other | No | No | - | - | - | Resolved | Aug 5, 2019 | - | |
| Dec 30, 2015 | - | MR | No | No | - | TT | - | Resolved | Feb 1, 2016 | - | |
| Dec 30, 2015 | - | MR | No | No | - | TT | - | Resolved | Feb 1, 2016 | - | |
| Dec 1, 2014 | Dec 31, 2014 | MCL | Yes | No | - | 5% of samples | - | Resolved | Dec 31, 2014 | - | |
| Dec 1, 2014 | Dec 31, 2014 | MCL | Yes | No | - | 5% of samples | - | Resolved | Dec 31, 2014 | - | |
| Dec 1, 2014 | Dec 31, 2014 | MCL | Yes | No | - | 5% of samples | - | Resolved | Dec 31, 2014 | - | |
| Dec 1, 2014 | Dec 31, 2014 | MCL | Yes | No | - | 5% of samples | - | Resolved | Dec 31, 2014 | - | |
| Jul 1, 2013 | Jul 31, 2013 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jul 31, 2013 | - | |
| Jul 1, 2013 | Jul 31, 2013 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jul 31, 2013 | - | |
| Jul 1, 2013 | Jul 31, 2013 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jul 31, 2013 | - | |
| Jul 1, 2013 | Jul 31, 2013 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jul 31, 2013 | - | |
| Jul 1, 2013 | Jul 31, 2013 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jul 31, 2013 | - | |
| Nov 1, 2012 | - | MR | No | Yes | - | - | - | Resolved | Dec 26, 2012 | - | |
| Nov 1, 2012 | - | MR | No | Yes | - | - | - | Resolved | Dec 26, 2012 | - | |
| Nov 1, 2012 | - | MR | No | Yes | - | - | - | Resolved | Dec 26, 2012 | - | |
| Nov 1, 2012 | Nov 30, 2012 | MCL | Yes | No | - | 5% of samples | - | Resolved | Nov 30, 2012 | - | |
| Nov 1, 2012 | Nov 30, 2012 | MCL | Yes | No | - | 5% of samples | - | Resolved | Nov 30, 2012 | - | |
| Nov 1, 2012 | Nov 30, 2012 | MCL | Yes | No | - | 5% of samples | - | Resolved | Nov 30, 2012 | - | |
| Nov 1, 2012 | Nov 30, 2012 | MCL | Yes | No | - | 5% of samples | - | Resolved | Nov 30, 2012 | - | |
| Nov 1, 2012 | Nov 30, 2012 | MCL | Yes | No | - | 5% of samples | - | Resolved | Nov 30, 2012 | - | |
| Sep 1, 2012 | - | MR | No | Yes | - | - | - | Resolved | Oct 24, 2012 | - | |
| Sep 1, 2012 | - | MR | No | Yes | - | - | - | Resolved | Oct 24, 2012 | - | |
| Sep 1, 2012 | - | MR | No | Yes | - | - | - | Resolved | Oct 24, 2012 | - | |
| Sep 1, 2012 | - | MR | No | Yes | - | - | - | Resolved | Oct 24, 2012 | - | |
| Sep 1, 2012 | - | MR | No | Yes | - | - | - | Resolved | Oct 24, 2012 | - | |
| Sep 1, 2012 | - | MR | No | Yes | - | - | - | Resolved | Oct 24, 2012 | - | |
| Aug 1, 2011 | Aug 31, 2011 | MR | No | No | - | 5% of samples | - | Resolved | Aug 31, 2011 | - | |
| Aug 1, 2011 | Aug 31, 2011 | MR | No | No | - | 5% of samples | - | Resolved | Aug 31, 2011 | - | |
| Aug 1, 2011 | Aug 31, 2011 | MR | No | No | - | 5% of samples | - | Resolved | Aug 31, 2011 | - | |
| Jul 1, 2011 | Jul 31, 2011 | MR | No | No | - | 5% of samples | - | Resolved | Jul 31, 2011 | - | |
| Jul 1, 2011 | Jul 31, 2011 | MR | No | No | - | 5% of samples | - | Resolved | Jul 31, 2011 | - | |
| Jul 1, 2011 | - | MR | No | Yes | - | - | - | Resolved | Mar 7, 2013 | - | |
| Jul 1, 2011 | Jul 31, 2011 | MR | No | No | - | 5% of samples | - | Resolved | Jul 31, 2011 | - | |
| Jul 1, 2011 | - | MR | No | Yes | - | - | - | Resolved | Mar 7, 2013 | - | |
| Jul 1, 2011 | - | MR | No | Yes | - | - | - | Resolved | Mar 7, 2013 | - | |
| Jul 1, 2011 | Jul 31, 2011 | MR | No | No | - | 5% of samples | - | Resolved | Jul 31, 2011 | - | |
| Jan 1, 2010 | - | MR | No | No | - | TT | - | Resolved | Mar 3, 2011 | - | |
| Jan 1, 2010 | - | MR | No | No | - | TT | - | Resolved | Mar 3, 2011 | - | |
| Sep 1, 2007 | Sep 30, 2007 | MCL | Yes | No | - | 5% of samples | - | Resolved | Sep 30, 2007 | - | |
| Sep 1, 2007 | Sep 30, 2007 | MCL | Yes | No | - | 5% of samples | - | Resolved | Sep 30, 2007 | - | |
| Sep 1, 2007 | Sep 30, 2007 | MCL | Yes | No | - | 5% of samples | - | Resolved | Sep 30, 2007 | - | |
| Sep 1, 2007 | Sep 30, 2007 | MCL | Yes | No | - | 5% of samples | - | Resolved | Sep 30, 2007 | - | |
| Sep 1, 2007 | Sep 30, 2007 | MCL | Yes | No | - | 5% of samples | - | Resolved | Sep 30, 2007 | - | |
| Sep 1, 2007 | Sep 30, 2007 | MCL | Yes | No | - | 5% of samples | - | Resolved | Sep 30, 2007 | - |
About This Water System
Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.