HERMOSA-OLD SYSTEM
South Dakota - Community Water System - PWSID: SD4600154
System Information
| PWSID | SD4600154 |
| System Name | HERMOSA-OLD SYSTEM |
| System Type | Community Water System |
| Water Source | Ground Water |
| 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 | HERMOSA |
| ZIP Code | 57744 |
| Address | PO BOX 298 |
| Organization | HERMOSA-OLD SYSTEM |
| Phone | 6052554291 |
Population & Service
| Population Served | 420 |
| Service Connections | 277 |
Drinking Water Violations (37)
This water system has 37 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Apr 1, 2025 | Apr 30, 2025 | MON | No | Yes | - | - | - | Resolved | Apr 30, 2025 | - | |
| Apr 1, 2025 | Apr 30, 2025 | MON | No | Yes | - | - | - | Resolved | Apr 30, 2025 | - | |
| Oct 1, 2021 | Dec 31, 2021 | MR | No | Yes | - | 5 pCi/L | - | Resolved | Dec 31, 2021 | - | |
| Oct 1, 2021 | Dec 31, 2021 | MR | No | Yes | - | 5 pCi/L | - | Resolved | Dec 31, 2021 | - | |
| Oct 1, 2021 | Dec 31, 2021 | MR | No | Yes | - | 15 pCi/L | - | Resolved | Dec 31, 2021 | - | |
| Oct 1, 2021 | Dec 31, 2021 | MR | No | Yes | - | 15 pCi/L | - | Resolved | Dec 31, 2021 | - | |
| Oct 1, 2021 | Dec 31, 2021 | MR | No | Yes | - | 30 ug/L | - | Resolved | Dec 31, 2021 | - | |
| Oct 1, 2021 | Dec 31, 2021 | MR | No | Yes | - | 30 ug/L | - | Resolved | Dec 31, 2021 | - | |
| Feb 1, 2010 | - | TT | Yes | No | - | - | - | Resolved | Mar 24, 2010 | - | |
| Feb 1, 2010 | - | TT | Yes | No | - | - | - | Resolved | Mar 24, 2010 | - | |
| Jan 1, 2006 | Mar 31, 2006 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Mar 31, 2006 | - | |
| Jan 1, 2006 | Mar 31, 2006 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Mar 31, 2006 | - | |
| Jan 1, 2006 | Mar 31, 2006 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Mar 31, 2006 | - | |
| Jan 1, 2006 | Mar 31, 2006 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Mar 31, 2006 | - | |
| Oct 1, 2005 | Dec 31, 2005 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Dec 31, 2005 | - | |
| Oct 1, 2005 | Dec 31, 2005 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Dec 31, 2005 | - | |
| Oct 1, 2005 | Dec 31, 2005 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Dec 31, 2005 | - | |
| Jul 1, 2005 | Sep 30, 2005 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Sep 30, 2005 | - | |
| Jul 1, 2005 | Sep 30, 2005 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Sep 30, 2005 | - | |
| Jul 1, 2005 | Sep 30, 2005 | MR | No | Yes | - | 4.0 mg/L | - | Resolved | Sep 30, 2005 | - | |
| Jul 1, 2004 | - | Other | No | No | - | - | - | Resolved | Jul 21, 2004 | - | |
| Jul 1, 2004 | - | Other | No | No | - | - | - | Resolved | Jul 21, 2004 | - | |
| Jul 1, 1995 | Jul 31, 1995 | MR | No | Yes | - | 5% of samples | - | Archived | Jul 31, 1995 | - | |
| Jul 1, 1995 | Jul 31, 1995 | MR | No | Yes | - | 5% of samples | - | Archived | Jul 31, 1995 | - | |
| Jul 1, 1991 | Jul 31, 1991 | MR | No | No | - | 5% of samples | - | Archived | Jul 31, 1991 | - | |
| Jul 1, 1991 | Jul 31, 1991 | MR | No | No | - | 5% of samples | - | Archived | Jul 31, 1991 | - | |
| Dec 14, 1990 | Jan 13, 1991 | Other | No | No | - | - | - | Archived | Jan 13, 1991 | - | |
| 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 | - | - | - | - | - | - | |
| - | - | - | 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.