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Sewage treatment plant, major discharger, Owatonna, Minnesota. NPDES permit MN0051284 expired May 31, 2026; its limits still apply. Last 12 months: no values over a limit, 1 required value missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Specific conductance | monthly maximum | report only (umho/cm) | all year | D046 |
| Oxygen, dissolved [DO] | monthly minimum | ≥ 5 mg/L | all year | D046 |
| pH | monthly minimum | ≥ 6 SU | all year | D046 |
| pH | monthly maximum | ≤ 9 SU | all year | D046 |
| Bicarbonate ion- [as HCO3] | monthly maximum | report only (mg/L) | all year | D046 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | D046 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | D046 |
| Solids, total suspended | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D046 |
| Solids, total suspended | monthly average | ≤ 568 kg/d | all year | D046 |
| Solids, total suspended | maximum weekly average | ≤ 851 kg/d | all year | D046 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | D046 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Dec | D046 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 7 mg/L | Oct, Nov | D046 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4 mg/L | Apr, May | D046 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Jun–Sep | D046 |
| Nitrogen, ammonia total [as N] | monthly average | report only (kg/d) | Jan, Feb, Mar, Dec | D046 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 241 kg/d | Oct, Nov | D046 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 138 kg/d | Apr, May | D046 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 52 kg/d | Jun–Sep | D046 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | D046 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | D046 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | Jun–Sep | D046 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | D046 |
| Phosphorus, total [as P] | monthly average | ≤ 18.9 kg/d | Jun–Sep | D046 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | D046 |
| Phosphorus, total [as P] | annual total | ≤ 5985 kg/yr | all year | D046 |
| Cyanide, total [as CN] | monthly maximum | report only (ug/L) | May, Sep | D046 |
| Cyanide, free [amenable to chlorination] | monthly maximum | report only (ug/L) | May, Sep | D046 |
| Calcium, total [as Ca] | monthly maximum | report only (mg/L) | all year | D046 |
| Magnesium, total [as Mg] | monthly maximum | report only (mg/L) | all year | D046 |
| Sodium, total [as Na] | monthly maximum | report only (mg/L) | all year | D046 |
| Potassium, total [as K] | monthly maximum | report only (mg/L) | all year | D046 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | all year | D046 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | all year | D046 |
| Cadmium, total [as Cd] | monthly maximum | report only (ug/L) | May, Sep | D046 |
| Chromium, hexavalent [as Cr] | quarterly maximum | ≤ 29 ug/L | Mar, Jun, Sep, Dec | D046 |
| Chromium, hexavalent [as Cr] | quarterly average | ≤ .38 kg/d | Mar, Jun, Sep, Dec | D046 |
| Copper, total [as Cu] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D046 |
| Lead, total [as Pb] | monthly maximum | report only (ug/L) | May, Sep | D046 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | all year | D046 |
| Coliform, fecal MPN + membrane ftl 44.5 C | monthly geometric mean | ≤ 200 #/100mL | Apr–Oct | D046 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D046 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D046 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D046 |
| Chlorine, total residual | daily maximum | ≤ .038 mg/L | all year | D046 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | all year | D046 |
| Mercury, dissolved [as Hg] | quarterly maximum | report only (ng/L) | Mar, Jun, Sep, Dec | D046 |
| Mercury, total [as Hg] | quarterly maximum | report only (ng/L) | Mar, Jun, Sep, Dec | D046 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 5 mg/L | all year | D046 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 10 mg/L | all year | D046 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 172 kg/d | all year | D046 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 344 kg/d | all year | D046 |
| BOD, carb-5 day, 20 deg C, percent removal | monthly average minimum | ≥ 85 % | all year | D046 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | D046 |
| Precipitation, total defined period/in | monthly total | report only (in) | all year | S049 |
| pH | monthly minimum | report only (SU) | all year | S049 |
| pH | monthly maximum | report only (SU) | all year | S049 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | S049 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | S049 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | S049 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | S049 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | S049 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | S049 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | S049 |
| BOD, carbonaceous [5 day, 20 C] | monthly maximum | report only (mg/L) | all year | S049 |
Cited limits by parameter: Minnesota's rules and the federal ones.
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