NEW UNDERWOOD
PWS ID: SD4600224 · NEW UNDERWOOD, South Dakota 57761
Population Served
679
Total Violations
144
Health-Based Violations
104
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 269
- County
- Pennington
- School/Daycare
- No
- MCL Violations
- 104
- Monitoring Violations
- 27
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Gross Alpha, Excl. Radon and U | MCL | 52 | 2010 |
| Combined Radium (-226 and -228) | MCL | 40 | 2010 |
| Coliform (TCR) | MCL | 12 | 1997 |
| Toluene | MR | 5 | 2009 |
| Combined Radium (-226 and -228) | MR | 4 | 2003 |
| Gross Alpha, Excl. Radon and U | MR | 4 | 2003 |
| Combined Uranium | MR | 3 | 2003 |
| Thallium, Total | MR | 3 | 1995 |
| Antimony, Total | MR | 3 | 1995 |
| Chlorine | MR | 3 | 2022 |
| Revised Total Coliform Rule | MON | 2 | 2022 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.