Serpent Lake WWTP
Crosby, MN · Crow Wing County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.67 MGD
- NPDES permit
- MNG585215
- Effective
- Permit expires
- November 2028
- Population served
- 5,251
- CWNS 2022
Serpent Lake WWTP is a publicly owned wastewater treatment works in Crosby, Crow Wing County, Minnesota, serving about 5,251 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit MNG585215 (effective), which expires in November 2028, with 1 recorded violation in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Uncovered lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 1
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Serpent Lake WWTP.
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Nearby wastewater treatment plants in Minnesota
Crosslake · 15 mi away
0.06 MGD
East Gull Lake · 18 mi away
0.13 MGD
Onamia · 24 mi away
0.3 MGD
Pine River · 25 mi away
0.09 MGD
Palisade · 27 mi away
0.007 MGD
Mcgregor · 32 mi away
—
Motley · 33 mi away
0.24 MGD
East Lake · 34 mi away
—
Serpent Lake 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 April 24, 2025.