Grand River Casino And Resort
PO Box 639, Mobridge, SD 57601 · Walworth County · Publicly Owned Treatment Works
- Average flow
- 0.01 MGD
- Design flow
- 0.02 MGD
- NPDES permit
- NDG589306
- Effective
- Permit expires
- March 2027
- Population served
- —
- CWNS 2022
Grand River Casino And Resort is a publicly owned wastewater treatment plant in Mobridge, Walworth County, South Dakota treating an average of 0.01 million gallons per day against a permitted design capacity of 0.02 MGD. It discharges under NPDES permit NDG589306 (effective), which expires in March 2027, with 16 recorded violations in the last three years.
Treatment technology
Treatment structures and unit processes at Grand River Casino And Resort.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 16
- Effluent violations
- 8
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 Grand River Casino And Resort in EPA's ICIS system.
- Formal actions
- 0
- none on record
- EPA inspections
- 7
- latest Jul 2019
No formal federal enforcement case is on record for this plant.
Full case history with a free Klarifi account
Every action against Grand River Casino And Resort with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at Grand River Casino And Resort.
No verified contacts on file yet
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Nearby wastewater treatment plants in South Dakota
Mobridge · 5 mi away
0.17 MGD
Selby · 23 mi away
—
Herreid · 27 mi away
0.03 MGD
Eureka · 44 mi away
—
Eagle Butte · 53 mi away
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Roscoe · 58 mi away
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Blunt · 77 mi away
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Leola · 77 mi away
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Grand River Casino And Resort: 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 July 18, 2023.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Significant industrial user · WWTP · all terms