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Sewage treatment plant, major discharger, Maple Lake, Minnesota. NPDES permit MN0066966, in force until May 31, 2031. Last 12 months: over a limit once (last February 2026), 16 required values missing, 3 of 48 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit |
|---|---|---|---|
| February 2026 | pH, monthly minimum | 4.6 | ≥ 6 SU |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | all year | D006 |
| pH | monthly minimum | ≥ 6 SU | all year | D006 |
| pH | monthly maximum | ≤ 9 SU | all year | D006 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | D006 |
| Solids, total suspended | monthly maximum | report only (mg/L) | Jan, Mar, May, Jul, Sep, Nov | D006 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | D006 |
| Solids, total suspended | monthly average | ≤ 134 kg/d | all year | D006 |
| Solids, total suspended | maximum weekly average | ≤ 202 kg/d | all year | D006 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | D006 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Apr, May, Oct, Nov | D006 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5 mg/L | Jan, Feb, Mar, Dec | D006 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 15 mg/L | Jun–Sep | D006 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 22.4 kg/d | Jan, Feb, Mar, Dec | D006 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 67.2 kg/d | Jun–Sep | D006 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | D006 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | D006 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | D006 |
| Phosphorus, total [as P] | 12-month average | ≤ 1 mg/L | all year | D006 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | all year | D006 |
| Phosphorus, total [as P] | annual total | ≤ 1636 kg/yr | all year | D006 |
| Chloride [as Cl] | monthly average | report only (mg/L) | all year | D006 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | D006 |
| Coliform, fecal MPN + membrane ftl 44.5 C | monthly geometric mean | ≤ 200 #/100mL | Apr–Oct | D006 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D006 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D006 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D006 |
| Solids, total dissolved | monthly average | report only (mg/L) | Mar, Sep | D006 |
| Mercury, total [as Hg] | monthly average | ≤ 10 ng/L | Jan, Mar, May, Jul, Sep, Nov | D006 |
| Mercury, total [as Hg] | daily maximum | ≤ 17 ng/L | Jan, Mar, May, Jul, Sep, Nov | D006 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | all year | D006 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 25 mg/L | all year | D006 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 67.2 kg/d | all year | D006 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 112 kg/d | all year | D006 |
| BOD, carb-5 day, 20 deg C, percent removal | monthly average minimum | ≥ 85 % | all year | D006 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | D006 |
| Precipitation, total defined period/in | monthly total | report only (in) | all year | S007 |
| pH | monthly minimum | report only (SU) | all year | S007 |
| pH | monthly maximum | report only (SU) | all year | S007 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | S007 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | S007 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | S007 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | S007 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | S007 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | S007 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | S007 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | S007 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | S007 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | S007 |
| BOD, carbonaceous [5 day, 20 C] | monthly maximum | report only (mg/L) | all year | S007 |
Cited limits by parameter: Minnesota's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/MN0066966 · MCP: https://passage-data.com/mcp