Mountain Lake WWTP
3rd Ave & 15th St, Mountain Lake, MN 56159 · Cottonwood County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.82 MGD
- NPDES permit
- MN0021466
- Expired
- Permit expires
- August 2023
- Population served
- 2,265
- CWNS 2022
Mountain Lake WWTP is a publicly owned wastewater treatment works in Mountain Lake, Cottonwood County, Minnesota, serving about 2,265 residents. It discharges under NPDES permit MN0021466 (expired), which expires in August 2023, with 48 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Mountain Lake WWTP.
Available with a free Klarifi account
See the full treatment train at Mountain Lake WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 48
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Mountain Lake WWTP.
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Nearby wastewater treatment plants in Minnesota
Butterfield · 7 mi away
0.2 MGD
Windom · 8 mi away
0.0021 MGD
Comfrey · 10 mi away
0.02 MGD
Odin · 14 mi away
—
Jeffers · 14 mi away
—
Saint James · 16 mi away
0.59 MGD
Sanborn · 19 mi away
—
Storden Township · 20 mi away
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Mountain 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 October 26, 2026; facility record last updated August 13, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biological nutrient removal · Tertiary treatment · all terms