WILLOW LAKE
South Dakota - Community Water System - PWSID: SD4600370
System Information
| PWSID | SD4600370 |
| System Name | WILLOW LAKE |
| System Type | Community Water System |
| Water Source | Ground Water Purchased |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 08 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Feb 13, 1979 |
| Last Reported | Mar 2, 2026 |
Location & Contact
| State | South Dakota |
| City | WILLOW LAKE |
| ZIP Code | 57278 |
| Address | PO BOX 317 |
| Organization | WILLOW LAKE |
| Phone | 6056253631 |
Population & Service
| Population Served | 255 |
| Service Connections | 163 |
Drinking Water Violations (59)
This water system has 59 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Nov 23, 2020 | - | TT | Yes | No | - | - | - | Resolved | Feb 9, 2023 | - | |
| Nov 23, 2020 | - | TT | Yes | No | - | - | - | Resolved | Feb 9, 2023 | - | |
| Feb 1, 2015 | - | TT | Yes | No | - | - | - | Resolved | Apr 14, 2016 | - | |
| Feb 1, 2015 | - | TT | Yes | No | - | - | - | Resolved | Apr 14, 2016 | - | |
| Feb 1, 2011 | - | TT | Yes | No | - | - | - | Resolved | Mar 14, 2011 | - | |
| Feb 1, 2011 | - | TT | Yes | No | - | - | - | Resolved | Mar 14, 2011 | - | |
| Feb 23, 2006 | - | TT | Yes | No | - | - | - | Resolved | Aug 16, 2007 | - | |
| Feb 23, 2006 | - | TT | Yes | No | - | - | - | Resolved | Aug 16, 2007 | - | |
| Jul 1, 2001 | Jul 31, 2001 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jul 31, 2001 | - | |
| Jul 1, 2001 | Jul 31, 2001 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jul 31, 2001 | - | |
| Jul 1, 2001 | Jul 31, 2001 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jul 31, 2001 | - | |
| Dec 1, 1999 | Dec 31, 1999 | MCL | Yes | No | - | 5% of samples | - | Resolved | Dec 31, 1999 | - | |
| Dec 1, 1999 | Dec 31, 1999 | MCL | Yes | No | - | 5% of samples | - | Resolved | Dec 31, 1999 | - | |
| Dec 1, 1999 | Dec 31, 1999 | MCL | Yes | No | - | 5% of samples | - | Resolved | Dec 31, 1999 | - | |
| Sep 1, 1997 | Sep 30, 1997 | MCL | Yes | No | - | 5% of samples | - | Resolved | Sep 30, 1997 | - | |
| Sep 1, 1997 | Sep 30, 1997 | MCL | Yes | No | - | 5% of samples | - | Resolved | Sep 30, 1997 | - | |
| Sep 1, 1997 | Sep 30, 1997 | MCL | Yes | No | - | 5% of samples | - | Resolved | Sep 30, 1997 | - | |
| Aug 1, 1994 | Aug 31, 1994 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 1994 | - | |
| Aug 1, 1994 | Aug 31, 1994 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 1994 | - | |
| Aug 1, 1994 | Aug 31, 1994 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 1994 | - | |
| Nov 1, 1993 | Nov 30, 1993 | MCL | Yes | No | - | 5% of samples | - | Resolved | Nov 30, 1993 | - | |
| Nov 1, 1993 | Nov 30, 1993 | MCL | Yes | No | - | 5% of samples | - | Resolved | Nov 30, 1993 | - | |
| Nov 1, 1993 | Nov 30, 1993 | MCL | Yes | No | - | 5% of samples | - | Resolved | Nov 30, 1993 | - | |
| Sep 1, 1993 | Sep 30, 1993 | MR | No | No | - | 5% of samples | - | Archived | Sep 30, 1993 | - | |
| Sep 1, 1993 | Sep 30, 1993 | MR | No | No | - | 5% of samples | - | Archived | Sep 30, 1993 | - | |
| Aug 1, 1992 | Aug 31, 1992 | MR | No | No | - | 5% of samples | - | Archived | Aug 31, 1992 | - | |
| Aug 1, 1992 | Aug 31, 1992 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 1992 | - | |
| Aug 1, 1992 | Aug 31, 1992 | MR | No | No | - | 5% of samples | - | Archived | Aug 31, 1992 | - | |
| Aug 1, 1992 | Aug 31, 1992 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 1992 | - | |
| Aug 1, 1992 | Aug 31, 1992 | MCL | Yes | No | - | 5% of samples | - | Resolved | Aug 31, 1992 | - | |
| Feb 13, 1992 | Mar 12, 1992 | Other | No | No | - | - | - | Archived | Mar 12, 1992 | - | |
| Dec 16, 1991 | Jan 15, 1992 | Other | No | No | - | - | - | Archived | Jan 15, 1992 | - | |
| Dec 1, 1991 | Dec 31, 1991 | MCL | Yes | No | - | 5% of samples | - | Resolved | Dec 31, 1991 | - | |
| Dec 1, 1991 | Dec 31, 1991 | MCL | Yes | No | - | 5% of samples | - | Resolved | Dec 31, 1991 | - | |
| Dec 1, 1991 | Dec 31, 1991 | MCL | Yes | No | - | 5% of samples | - | Resolved | Dec 31, 1991 | - | |
| Dec 1, 1991 | Dec 31, 1991 | MCL | Yes | No | - | 5% of samples | - | Resolved | Dec 31, 1991 | - | |
| Oct 1, 1991 | Oct 31, 1991 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 1991 | - | |
| Oct 1, 1991 | Oct 31, 1991 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 1991 | - | |
| Oct 1, 1991 | Oct 31, 1991 | MCL | Yes | No | - | 5% of samples | - | Resolved | Oct 31, 1991 | - | |
| Aug 1, 1991 | Aug 31, 1991 | MR | No | Yes | - | 5% of samples | - | Archived | Aug 31, 1991 | - | |
| Oct 4, 1990 | Nov 3, 1990 | Other | No | No | - | - | - | Archived | Nov 3, 1990 | - | |
| Jul 1, 1976 | Jun 30, 1980 | MR | No | No | - | 5 pCi/L | - | Archived | Jun 30, 1980 | - | |
| Jul 1, 1976 | Jun 30, 1980 | MR | No | No | - | 15 pCi/L | - | Archived | Jun 30, 1980 | - | |
| - | - | - | No | No | - | - | - | - | - | - | |
| - | - | - | No | No | - | - | - | - | - | - | |
| - | - | - | No | No | - | - | - | - | - | - | |
| - | - | - | No | No | - | - | - | - | - | - | |
| - | - | - | No | No | - | - | - | - | - | - | |
| - | - | - | 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.