City Of South Sioux City
South Sioux City, NE · Dakota County · Publicly Owned Treatment Works
- Average flow
- 2.27 MGD
- Design flow
- 2.02 MGD
- NPDES permit
- NE0139904
- Effective
- Permit expires
- March 2028
- Population served
- —
- CWNS 2022
City Of South Sioux City is a publicly owned wastewater treatment plant in South Sioux City, Dakota County, Nebraska treating an average of 2.27 million gallons per day against a permitted design capacity of 2.02 MGD. Treatment on site includes covered lagoons. It discharges under NPDES permit NE0139904 (effective), which expires in March 2028, with 86 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Covered lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 86
- Effluent violations
- 86
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at City Of South Sioux City.
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Ponca · 18 mi away
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Thurston · 24 mi away
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Wakefield · 26 mi away
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Newcastle · 28 mi away
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Bancroft · 30 mi away
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Decatur · 31 mi away
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City Of South Sioux City: 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 August 14, 2026.