Annandale/maple Lake WWTF
Maple Lake, MN · Wright County · Publicly Owned Treatment Works
- Average flow
- 0.69 MGD
- Design flow
- 4.98 MGD
- NPDES permit
- MN0066966
- Effective
- Permit expires
- May 2031
- Population served
- 2,177
- CWNS 2022
Annandale/maple Lake WWTF is a publicly owned wastewater treatment works in Maple Lake, Wright County, Minnesota treating an average of 0.69 million gallons per day against a permitted design capacity of 4.98 MGD, serving about 2,177 residents. It discharges under NPDES permit MN0066966 (effective), which expires in May 2031, with 6 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 6
- Effluent violations
- 6
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Annandale/maple Lake WWTF.
No verified contacts on file yet
Klarifi verifies plant and municipal decision-makers continuously. Start a free trial to browse contacts at nearby plants and flag this one for verification.
Nearby wastewater treatment plants in Minnesota
Buffalo · 8 mi away
1.23 MGD
Monticello · 11 mi away
1.05 MGD
Montrose · 12 mi away
0.39 MGD
Cokato · 12 mi away
0.47 MGD
Big Lake · 13 mi away
0.74 MGD
Becker · 13 mi away
0.91 MGD
Clear Lake · 13 mi away
0.18 MGD
Rockford · 15 mi away
—
Annandale/maple Lake WWTF: 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 December 15, 2024.