Preston WWTP
Preston, MN · Fillmore County · Publicly Owned Treatment Works
- Average flow
- 0.35 MGD
- Design flow
- 0.78 MGD
- NPDES permit
- MN0020745
- Effective
- Permit expires
- July 2027
- Population served
- 1,322
- CWNS 2022
Preston WWTP is a publicly owned wastewater treatment works in Preston, Fillmore County, Minnesota treating an average of 0.35 million gallons per day against a permitted design capacity of 0.78 MGD, serving about 1,322 residents. Treatment on site includes clarifiers, biogas silos, biogas balloons. It discharges under NPDES permit MN0020745 (effective), which expires in July 2027, with 7 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 7
- Effluent violations
- 3
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Preston WWTP.
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Nearby wastewater treatment plants in Minnesota
Harmony · 10 mi away
0.05 MGD
Chatfield · 13 mi away
0.18 MGD
Peterson · 15 mi away
0.02 MGD
Spring Valley · 15 mi away
0.48 MGD
Ostrander · 18 mi away
0.0069 MGD
Rushford · 19 mi away
0.11 MGD
Mabel · 19 mi away
0.06 MGD
Racine · 21 mi away
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Preston WWTP: 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 November 6, 2025.