MOUNT VERNON
South Dakota — Community Water System — PWSID: SD4600220
System Information
| PWSID | SD4600220 |
| System Name | MOUNT VERNON |
| System Type | Community Water System |
| Water Source | Surface Water Purchased |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 08 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Feb 13, 1979 |
| Last Reported | Dec 9, 2025 |
Location & Contact
| State | South Dakota |
| City | MOUNT VERNON |
| ZIP Code | 57363 |
| Address | PO BOX 52 |
| Organization | MOUNT VERNON |
| Phone | 6052365207 |
Population & Service
| Population Served | 461 |
| Service Connections | 204 |
Drinking Water Violations (22)
This water system has 22 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Feb 1, 2020 | — | Stage 1 Disinfectants and Disinfection Byproducts Rule | TT | Yes | No | — | — | — | Resolved | May 13, 2020 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Feb 1, 2020 | — | Stage 1 Disinfectants and Disinfection Byproducts Rule | TT | Yes | No | — | — | — | Resolved | May 13, 2020 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
| Aug 1, 1996 | Aug 31, 1996 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Aug 31, 1996 | Total Coliform Rule |
| Aug 1, 1996 | Aug 31, 1996 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Aug 31, 1996 | Total Coliform Rule |
| Aug 1, 1996 | Aug 31, 1996 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Aug 31, 1996 | Total Coliform Rule |
| Sep 1, 1995 | Sep 30, 1995 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 1995 | Total Coliform Rule |
| Sep 1, 1995 | Sep 30, 1995 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 1995 | Total Coliform Rule |
| Aug 1, 1995 | Aug 31, 1995 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Aug 31, 1995 | Total Coliform Rule |
| Aug 1, 1995 | Aug 31, 1995 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Aug 31, 1995 | Total Coliform Rule |
| Jul 1, 1995 | Jul 31, 1995 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jul 31, 1995 | Total Coliform Rule |
| Jul 1, 1995 | Jul 31, 1995 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jul 31, 1995 | Total Coliform Rule |
| Jul 1, 1995 | Jul 31, 1995 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jul 31, 1995 | Total Coliform Rule |
| Jul 1, 1995 | Jul 31, 1995 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jul 31, 1995 | Total Coliform Rule |
| Jul 1, 1995 | Jul 31, 1995 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jul 31, 1995 | Total Coliform Rule |
| Jun 1, 1995 | Jun 30, 1995 | Coliform (TCR) | MR | No | Yes | — | 5% of samples | — | Resolved | Jun 30, 1995 | Total Coliform Rule |
| Jun 1, 1995 | Jun 30, 1995 | Coliform (TCR) | MR | No | Yes | — | 5% of samples | — | Resolved | Jun 30, 1995 | Total Coliform Rule |
| Jun 1, 1995 | Jun 30, 1995 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jun 30, 1995 | Total Coliform Rule |
| Jun 1, 1995 | Jun 30, 1995 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jun 30, 1995 | Total Coliform Rule |
| Jul 1, 1994 | Jul 31, 1994 | Coliform (TCR) | MR | No | Yes | — | 5% of samples | — | Resolved | Jul 31, 1994 | Total Coliform Rule |
| Jun 1, 1994 | Jun 30, 1994 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jun 30, 1994 | Total Coliform Rule |
| Jul 1, 1976 | Jun 30, 1980 | Combined Radium (-226 and -228) | MR | No | No | — | 5 pCi/L | — | Archived | Jun 30, 1980 | Radionuclides and Revised Rad Rule |
| Jul 1, 1976 | Jun 30, 1980 | Gross Alpha, Excl. Radon and U | MR | No | No | — | 15 pCi/L | — | Archived | Jun 30, 1980 | Radionuclides and Revised Rad Rule |
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.