Zwingle, City Of STP
80 Walnut St, Zwingle, IA 52079 · Dubuque County · Publicly Owned Treatment Works
- Average flow
- 0.0092 MGD
- Design flow
- 0.03 MGD
- NPDES permit
- IA0074209
- Effective
- Permit expires
- September 2029
- Population served
- 84
- CWNS 2022
Zwingle, City Of STP is a publicly owned wastewater treatment works in Zwingle, Dubuque County, Iowa treating an average of 0.0092 million gallons per day against a permitted design capacity of 0.03 MGD, serving about 84 residents. It discharges under NPDES permit IA0074209 (effective), which expires in September 2029, with 18 recorded violations in the last three years.
Treatment technology
Treatment structures and unit processes at Zwingle, City Of STP.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 18
- Effluent violations
- 18
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Zwingle, City Of STP, with validated emails and direct phone numbers.
Unlock 1 verified contact
Names, validated emails and direct phone numbers for decision-makers at Zwingle, City Of STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Iowa
La Motte · 3 mi away
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Bernard · 8 mi away
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Saint Donatus · 9 mi away
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Andrew · 11 mi away
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Bellevue · 13 mi away
0.16 MGD
Springbrook · 15 mi away
—
Epworth · 15 mi away
0.13 MGD
Asbury · 16 mi away
0.42 MGD
Zwingle, City Of STP: 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 January 29, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · WWTP · Biosolids · all terms