Stephan Lagoon System
Stephan, SD · Hyde County · Publicly Owned Treatment Works
- Average flow
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- Design flow
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- NPDES permit
- SDG589204
- Effective
- Permit expires
- March 2027
- Population served
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- CWNS 2022
Stephan Lagoon System is a publicly owned wastewater treatment works in Stephan, Hyde County, South Dakota. Treatment on site includes uncovered lagoons. It discharges under NPDES permit SDG589204 (effective), which expires in March 2027.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Uncovered lagoons
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Compliance snapshot (last 3 years)
- Total violations
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- Effluent violations
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Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Stephan Lagoon System.
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Nearby wastewater treatment plants in South Dakota
Fort Thompson · 12 mi away
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Lower Brule · 13 mi away
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Lower Brule · 13 mi away
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Fort Thompson · 14 mi away
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Fort Thompson · 23 mi away
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Reliance · 26 mi away
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Oacoma · 31 mi away
0.37 MGD
Kennebec · 31 mi away
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Stephan Lagoon System: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026; facility record last updated February 27, 2025.