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Sewage treatment plant, Sauk Centre, Minnesota. NPDES permit MN0024821, in force until Feb 29, 2028. Last 12 months: over a limit once (last September 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| September 2026 | Phosphorus, total [as P], monthly average | 1.5 | ≤ 1 mg/L | 50% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Specific conductance | monthly maximum | report only (umho/cm) | all year | D036 |
| Oxygen, dissolved [DO] | monthly minimum | ≥ 4 mg/L | all year | D036 |
| pH | monthly minimum | ≥ 6 SU | all year | D036 |
| pH | monthly maximum | ≤ 9 SU | all year | D036 |
| Bicarbonate ion- [as HCO3] | monthly maximum | report only (mg/L) | all year | D036 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | D036 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | D036 |
| Solids, total suspended | monthly maximum | report only (mg/L) | Jul | D036 |
| Solids, total suspended | monthly average | ≤ 100.7 kg/d | all year | D036 |
| Solids, total suspended | maximum weekly average | ≤ 151 kg/d | all year | D036 |
| Nitrogen, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | D036 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 29 mg/L | Apr, May | D036 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 18 mg/L | Jan, Feb, Mar, Dec | D036 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.9 mg/L | Jun–Sep | D036 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 11 mg/L | Oct, Nov | D036 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 97.3 kg/d | Apr, May | D036 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 60.4 kg/d | Jan, Feb, Mar, Dec | D036 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 6.4 kg/d | Jun–Sep | D036 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 36.9 kg/d | Oct, Nov | D036 |
| Nitrogen, Kjeldahl, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | D036 |
| Nitrite + Nitrate total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | D036 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | D036 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | all year | D036 |
| Phosphorus, total [as P] | annual total | ≤ 982.5 kg/yr | all year | D036 |
| Calcium, total [as Ca] | monthly maximum | report only (mg/L) | all year | D036 |
| Magnesium, total [as Mg] | monthly maximum | report only (mg/L) | all year | D036 |
| Sodium, total [as Na] | monthly maximum | report only (mg/L) | all year | D036 |
| Potassium, total [as K] | monthly maximum | report only (mg/L) | all year | D036 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | all year | D036 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | all year | D036 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | all year | D036 |
| Coliform, fecal MPN + membrane ftl 44.5 C | monthly geometric mean | ≤ 200 #/100mL | Apr–Oct | D036 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D036 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D036 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D036 |
| Solids, total dissolved | monthly average | report only (mg/L) | all year | D036 |
| Mercury, dissolved [as Hg] | monthly maximum | report only (ng/L) | Jul | D036 |
| Mercury, total [as Hg] | monthly maximum | report only (ng/L) | Jul | D036 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | all year | D036 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 15 mg/L | all year | D036 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 33.6 kg/d | all year | D036 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 50.3 kg/d | all year | D036 |
| BOD, carb-5 day, 20 deg C, percent removal | monthly average minimum | ≥ 85 % | all year | D036 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | D036 |
| Precipitation, total defined period/in | monthly total | report only (in) | all year | S039 |
| pH | monthly minimum | report only (SU) | all year | S039 |
| pH | monthly maximum | report only (SU) | all year | S039 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | S039 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | S039 |
| Nitrogen, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S039 |
| Nitrogen, Kjeldahl, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S039 |
| Nitrite + Nitrate total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S039 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | S039 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | S039 |
| BOD, carbonaceous [5 day, 20 C] | monthly maximum | report only (mg/L) | all year | S039 |
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/MN0024821 · MCP: https://passage-data.com/mcp