Water Quality: SPEARFISH, SD
27 water systems • 13,411 people served
No Health ViolationsWater Quality Summary
SPEARFISH is served by 27 public water systems with a combined service population of 13,411 people, and has 84 EPA Safe Drinking Water Act violations on record. None of those violations are health-based — the records reflect missed monitoring or reporting deadlines rather than a contaminant exceeding safe levels. SPEARFISH's violation count is 12% above the national average for South Dakota. Contaminants associated with violations include Chlorine, Coliform (TCR), Nitrate.
Contaminants Found
Eye and nose irritation at high levels; long-term exposure above the MCL may cause liver and kidney damage.
Common source: Water treatment disinfectant added to kill harmful microorganisms
EPA limit: 4.0 mg/L (MRDL — Maximum Residual Disinfectant Level)
Causes methemoglobinemia (blue baby syndrome) in infants, reducing the blood's ability to carry oxygen.
Common source: Fertilizer runoff, septic systems, animal feedlots, natural deposits
EPA limit: 10 mg/L (as nitrogen)
Water Systems Serving SPEARFISH
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| SPEARFISH | SD4600311 | Groundwater | 12,193 | 0 |
| MOUNTAIN PLAINS 2 HOMEOWNERS ASSOC | SD4602169 | Groundwater | 268 | 12 |
| WALNUT PARK | SD4600316 | Groundwater | 180 | 14 |
| SPEARFISH VALLEY MOBILE ESTATES | SD4600625 | Groundwater | 163 | 0 |
| KEN'S TRAILER COURT | SD4600314 | Groundwater | 110 | 6 |
| WESTFIELD ADDITION | SD4600521 | Groundwater | 104 | 0 |
| WESTVIEW HOMEOWNERS ASSOCIATION | SD4600876 | Groundwater | 103 | 0 |
| LOURIE LANE HOMEOWNERS ASSOC | SD4600416 | Groundwater | 75 | 2 |
| DEBERG WELL USERS ASSOCIATION | SD4602095 | Groundwater | 54 | 0 |
| SUNRISE HOMEOWNERS ASSOCIATION | SD4600512 | Groundwater | 50 | 0 |
| SPRING CREEK PRESERVE | SD4602331 | Groundwater | 35 | 0 |
| REYNOLDS COURT | SD4600160 | Groundwater | 28 | 12 |
| CENTENNIAL HILLS HOME ASSOCIATION | SD4602176 | Groundwater | 25 | 28 |
| BICENTENNIAL TRAILER COURT | SD4600426 | Groundwater | 23 | 10 |
Concerned About Your Water?
A home water filter can remove common contaminants. NSF-certified filters are tested against EPA standards.
Consider a reverse osmosis system for comprehensive filtration or a carbon filter for basic improvement.
Other Cities in South Dakota
Data Sources
Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). Data includes all recorded violations for active community water systems.