GREGORY
PWS ID: SD4600145 · GREGORY, South Dakota 57533
Population Served
1,221
Total Violations
84
Health-Based Violations
4
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 741
- County
- Gregory
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 64
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 7 | 2005 |
| Gross Alpha, Excl. Radon and U | MR | 3 | 1988 |
| Combined Radium (-226 and -228) | MR | 3 | 1988 |
| Nitrate | MR | 3 | 1995 |
| Cadmium | MR | 2 | 1989 |
| Chromium | MR | 2 | 1989 |
| Mercury | MR | 2 | 1989 |
| Selenium | MR | 2 | 1989 |
| LASSO | MR | 2 | 1999 |
| Heptachlor | MR | 2 | 1999 |
| Heptachlor epoxide | MR | 2 | 1999 |
| Atrazine | MR | 2 | 1999 |
| Benzo(a)pyrene | MR | 2 | 1999 |
| Hexachlorocyclopentadiene | MR | 2 | 1999 |
| Endrin | MR | 2 | 1999 |
| Barium | MR | 2 | 1989 |
| Methoxychlor | MR | 2 | 1999 |
| Di(2-ethylhexyl) adipate | MR | 2 | 1999 |
| Total Polychlorinated Biphenyls (PCB) | MR | 2 | 1999 |
| Coliform (TCR) | MR | 2 | 1991 |
| Fluoride | MR | 2 | 1989 |
| HEXACHLOROBENZENE | MR | 2 | 1999 |
| BHC-GAMMA | MR | 2 | 1999 |
| Simazine | MR | 2 | 1999 |
| Chlordane | MR | 2 | 1999 |
| Di(2-ethylhexyl) phthalate | MR | 2 | 1999 |
| Arsenic | MR | 2 | 1989 |
| Toxaphene | MR | 2 | 1999 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | TT | 2 | 2004 |
| Groundwater Rule | TT | 2 | 2019 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.