BIG SIOUX COMMUNITY WATER SYSTEM
South Dakota — Community Water System — PWSID: SD4600429
System Information
| PWSID | SD4600429 |
| System Name | BIG SIOUX COMMUNITY WATER SYSTEM |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Private |
| EPA Region | 08 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Feb 13, 1979 |
| Last Reported | Dec 9, 2025 |
Location & Contact
| State | South Dakota |
| City | EGAN |
| ZIP Code | 57024 |
| Address | 23343 479TH AVE |
| Organization | BIG SIOUX COMMUNITY WATER SYSTEM |
| Phone | 6059972098 |
Population & Service
| Population Served | 5,800 |
| Service Connections | 2,330 |
Drinking Water Violations (4)
This water system has 4 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jul 1, 2021 | Sep 30, 2021 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Sep 30, 2021 | Nitrate Rule |
| Jul 1, 2021 | Sep 30, 2021 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Sep 30, 2021 | Nitrate Rule |
| Jul 1, 1976 | Jun 30, 1980 | Combined Radium (-226 and -228) | MR | No | No | — | 5 pCi/L | — | Archived | Jun 30, 1980 | Radionuclides and Revised Rad Rule |
| Jul 1, 1976 | Jun 30, 1980 | Gross Alpha, Excl. Radon and U | MR | No | No | — | 15 pCi/L | — | Archived | Jun 30, 1980 | Radionuclides and Revised Rad Rule |
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.