SWAN LAKE ESTATES
Montana — Community Water System — PWSID: MO1041186
System Information
| PWSID | MO1041186 |
| System Name | SWAN LAKE ESTATES |
| System Type | Community Water System |
| Water Source | Ground Water Purchased |
| Activity Status | Active |
| Owner Type | Private |
| EPA Region | 07 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Apr 3, 1997 |
| Last Reported | Mar 25, 2026 |
Location & Contact
| State | Montana |
| City | TREGO |
| ZIP Code | 59934-0000 |
| Address | OMT PARKS |
| Organization | PORTER, ELEANOR I |
| Phone | 406-291-2629 |
Population & Service
| Population Served | 115 |
| Service Connections | 46 |
Drinking Water Violations (43)
This water system has 43 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oct 1, 2025 | — | MR | No | No | — | TT | — | Unaddressed | — | — | |
| Jul 1, 2020 | — | Other | No | No | — | — | — | Resolved | Jan 15, 2021 | — | |
| Jul 1, 2019 | — | Other | No | No | — | — | — | Resolved | Jan 15, 2021 | — | |
| Sep 1, 2005 | Sep 30, 2005 | MR | No | No | — | 5% of samples | — | Resolved | Sep 30, 2005 | — | |
| Sep 1, 2005 | Sep 30, 2005 | MR | No | No | — | 5% of samples | — | Resolved | Sep 30, 2005 | — | |
| Sep 1, 2005 | Sep 30, 2005 | MR | No | No | — | 5% of samples | — | Resolved | Sep 30, 2005 | — | |
| Sep 1, 2005 | Sep 30, 2005 | MR | No | No | — | 5% of samples | — | Resolved | Sep 30, 2005 | — | |
| Dec 1, 2004 | Dec 31, 2004 | MR | No | No | — | 5% of samples | — | Resolved | Dec 31, 2004 | — | |
| Dec 1, 2004 | Dec 31, 2004 | MR | No | No | — | 5% of samples | — | Resolved | Dec 31, 2004 | — | |
| Dec 1, 2004 | Dec 31, 2004 | MR | No | No | — | 5% of samples | — | Resolved | Dec 31, 2004 | — | |
| Dec 1, 2004 | Dec 31, 2004 | MR | No | No | — | 5% of samples | — | Resolved | Dec 31, 2004 | — | |
| Nov 1, 2004 | Nov 30, 2004 | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 2004 | — | |
| Nov 1, 2004 | Nov 30, 2004 | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 2004 | — | |
| Nov 1, 2004 | Nov 30, 2004 | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 2004 | — | |
| Nov 1, 2004 | Nov 30, 2004 | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 2004 | — | |
| May 1, 2002 | May 31, 2002 | MR | No | No | — | 5% of samples | — | Resolved | May 31, 2002 | — | |
| May 1, 2002 | May 31, 2002 | MR | No | No | — | 5% of samples | — | Resolved | May 31, 2002 | — | |
| May 1, 2002 | May 31, 2002 | MR | No | No | — | 5% of samples | — | Resolved | May 31, 2002 | — | |
| May 1, 2002 | May 31, 2002 | MR | No | No | — | 5% of samples | — | Resolved | May 31, 2002 | — | |
| Dec 1, 2001 | Dec 31, 2001 | MR | No | No | — | 5% of samples | — | Resolved | Dec 31, 2001 | — | |
| Dec 1, 2001 | Dec 31, 2001 | MR | No | No | — | 5% of samples | — | Resolved | Dec 31, 2001 | — | |
| Dec 1, 2001 | Dec 31, 2001 | MR | No | No | — | 5% of samples | — | Resolved | Dec 31, 2001 | — | |
| Oct 1, 2001 | — | MR | No | No | — | TT | — | Resolved | Sep 7, 2004 | — | |
| Jul 1, 2001 | — | Other | No | No | — | — | — | Resolved | Mar 3, 2003 | — | |
| Jun 1, 2001 | Jun 30, 2001 | MR | No | No | — | 5% of samples | — | Resolved | Jun 30, 2001 | — | |
| Jun 1, 2001 | Jun 30, 2001 | MR | No | No | — | 5% of samples | — | Resolved | Jun 30, 2001 | — | |
| Jun 1, 2001 | Jun 30, 2001 | MR | No | No | — | 5% of samples | — | Resolved | Jun 30, 2001 | — | |
| Nov 1, 2000 | Nov 30, 2000 | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 2000 | — | |
| Nov 1, 2000 | Nov 30, 2000 | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 2000 | — | |
| Nov 1, 2000 | Nov 30, 2000 | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 2000 | — | |
| Nov 1, 1998 | Nov 30, 1998 | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 1998 | — | |
| Nov 1, 1998 | Nov 30, 1998 | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 1998 | — | |
| Nov 1, 1998 | Nov 30, 1998 | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 1998 | — | |
| Nov 1, 1998 | Nov 30, 1998 | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 1998 | — | |
| Nov 1, 1997 | Nov 30, 1997 | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 1997 | — | |
| Nov 1, 1997 | Nov 30, 1997 | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 1997 | — | |
| Nov 1, 1997 | Nov 30, 1997 | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 1997 | — | |
| Nov 1, 1997 | Nov 30, 1997 | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 1997 | — | |
| Aug 1, 1997 | Aug 31, 1997 | MR | No | No | — | 5% of samples | — | Resolved | Aug 31, 1997 | — | |
| Aug 1, 1997 | Aug 31, 1997 | MR | No | No | — | 5% of samples | — | Resolved | Aug 31, 1997 | — | |
| Aug 1, 1997 | Aug 31, 1997 | MR | No | No | — | 5% of samples | — | Resolved | Aug 31, 1997 | — | |
| — | — | — | No | No | — | — | — | — | — | — | |
| — | — | — | No | No | — | — | — | — | — | — |
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.