Fort Thompson Lagoon System
PO Box 530, Fort Thompson, SD 57339 · Buffalo County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.12 MGD
- NPDES permit
- SDG589203
- Effective
- Permit expires
- March 2027
- Population served
- —
- CWNS 2022
Fort Thompson Lagoon System is a publicly owned wastewater treatment works in Fort Thompson, Buffalo County, South Dakota. It discharges under NPDES permit SDG589203 (effective), which expires in March 2027.
Treatment technology
One treatment structure or unit process identified at Fort Thompson Lagoon System.
Available with a free Klarifi account
See the full treatment train at Fort Thompson Lagoon System: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- —
- Effluent violations
- —
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Fort Thompson Lagoon System in EPA's ICIS system.
- Formal actions
- 0
- none on record
- EPA inspections
- 2
- latest Mar 2005
No formal federal enforcement case is on record for this plant.
Full case history with a free Klarifi account
Every action against Fort Thompson Lagoon System with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at Fort Thompson Lagoon System.
No verified contacts on file yet
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Nearby wastewater treatment plants in South Dakota
Fort Thompson · 2 mi away
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Fort Thompson · 3 mi away
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Lower Brule · 7 mi away
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Lower Brule · 7 mi away
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Fort Thompson · 13 mi away
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Reliance · 13 mi away
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Stephan · 14 mi away
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Oacoma · 17 mi away
0.39 MGD
Fort Thompson 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 October 26, 2026; facility record last updated April 24, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biosolids · Filter press · all terms