WALNUT PARK
PWS ID: SD4600316 · SPEARFISH, South Dakota 57783
Population Served
180
Total Violations
219
Health-Based Violations
20
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 72
- County
- Lawrence
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 177
- Treatment Tech Violations
- 20
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Chlorine | MR | 40 | 2018 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | TT | 14 | 2019 |
| Arsenic | MR | 13 | 2006 |
| Public Notice | Other | 13 | 2007 |
| Lead and Copper Rule | MR | 9 | 2006 |
| Total Haloacetic Acids (HAA5) | MR | 5 | 2006 |
| TTHM | MR | 5 | 2006 |
| Coliform (TCR) | MR | 4 | 2013 |
| Groundwater Rule | TT | 4 | 2018 |
| Revised Total Coliform Rule | MON | 3 | 2018 |
| LASSO | MR | 3 | 1993 |
| Total Polychlorinated Biphenyls (PCB) | MR | 3 | 1993 |
| Di(2-ethylhexyl) phthalate | MR | 3 | 1993 |
| Hexachlorocyclopentadiene | MR | 3 | 1993 |
| HEXACHLOROBENZENE | MR | 3 | 1993 |
| BHC-GAMMA | MR | 3 | 1993 |
| Aldicarb | MR | 3 | 1993 |
| Aldicarb sulfone | MR | 3 | 1993 |
| Carbofuran | MR | 3 | 1993 |
| Dinoseb | MR | 3 | 1993 |
| Pentachlorophenol | MR | 3 | 1993 |
| 2,4-D | MR | 3 | 1993 |
| ETHYLENE DIBROMIDE | MR | 3 | 1993 |
| Endothall | MR | 3 | 1993 |
| Glyphosate | MR | 3 | 1993 |
| Di(2-ethylhexyl) adipate | MR | 3 | 1993 |
| Endrin | MR | 3 | 1993 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 3 | 1993 |
| OXAMYL | MR | 3 | 1993 |
| 2,4,5-TP | MR | 3 | 1993 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.