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Sewage treatment plant, major discharger, Princeton, Minnesota. NPDES permit MN0024538, in force until Feb 28, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | monthly minimum | ≥ 5 mg/L | Jan, Feb, Mar, Jun, Jul, Aug, Sep, Dec | D062 |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | Apr, May, Oct, Nov | D062 |
| pH | monthly minimum | ≥ 6 SU | all year | D062 |
| pH | monthly maximum | ≤ 9 SU | all year | D062 |
| Solids, total suspended | monthly average | report only (mg/L) | Jan, Mar, May, Jul, Sep, Nov | D062 |
| Solids, total suspended | monthly average | ≤ 10 mg/L | all year | D062 |
| Solids, total suspended | daily maximum | report only (mg/L) | Jan, Mar, May, Jul, Sep, Nov | D062 |
| Solids, total suspended | maximum weekly average | ≤ 15 mg/L | all year | D062 |
| Solids, total suspended | monthly average | ≤ 72 kg/d | all year | D062 |
| Solids, total suspended | maximum weekly average | ≤ 108 kg/d | all year | D062 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | D062 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5 mg/L | Jan, Feb, Mar, Dec | D062 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3 mg/L | Jun–Sep | D062 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Apr, May, Oct, Nov | D062 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 36 kg/d | Jan, Feb, Mar, Dec | D062 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 21.6 kg/d | Jun–Sep | D062 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | D062 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | D062 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | D062 |
| Phosphorus, total [as P] | monthly average | ≤ .3 mg/L | May–Sep | D062 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | D062 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | May–Sep | D062 |
| Phosphorus, total [as P] | year-to-date total | ≤ 1862 kg/yr | all year | D062 |
| Sulfate, total [as SO4] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D062 |
| Coliform, fecal MPN + membrane ftl 44.5 C | monthly geometric mean | ≤ 200 #/100mL | Apr–Oct | D062 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D062 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D062 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D062 |
| Solids, total dissolved | monthly average | report only (mg/L) | Mar, Sep | D062 |
| Mercury, dissolved [as Hg] | monthly average | report only (ng/L) | Jan, Mar, May, Jul, Sep, Nov | D062 |
| Mercury, dissolved [as Hg] | daily maximum | report only (ng/L) | Jan, Mar, May, Jul, Sep, Nov | D062 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | Jan, Mar, May, Jul, Sep, Nov | D062 |
| Mercury, total [as Hg] | monthly average | ≤ 28.1 mg/d | Jan, Mar, May, Jul, Sep, Nov | D062 |
| Mercury, total [as Hg] | daily maximum | report only (mg/d) | Jan, Mar, May, Jul, Sep, Nov | D062 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | Apr, May, Oct, Nov | D062 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | Jan, Feb, Mar, Jun, Jul, Aug, Sep, Dec | D062 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 40 mg/L | Apr, May, Oct, Nov | D062 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 25 mg/L | Jan, Feb, Mar, Jun, Jul, Aug, Sep, Dec | D062 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 180 kg/d | Apr, May, Oct, Nov | D062 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 108 kg/d | Jan, Feb, Mar, Jun, Jul, Aug, Sep, Dec | D062 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 288 kg/d | Apr, May, Oct, Nov | D062 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 180 kg/d | Jan, Feb, Mar, Jun, Jul, Aug, Sep, Dec | D062 |
| BOD, carb-5 day, 20 deg C, percent removal | monthly average minimum | ≥ 85 % | all year | D062 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | D062 |
| Precipitation, total defined period/in | monthly total | report only (in) | all year | S066 |
| pH | monthly minimum | report only (SU) | all year | S066 |
| pH | monthly maximum | report only (SU) | all year | S066 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | S066 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | S066 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | S066 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | S066 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | S066 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | S066 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | S066 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | S066 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | S066 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | Jan, Mar, May, Jul, Sep, Nov | S066 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | S066 |
| BOD, carbonaceous [5 day, 20 C] | monthly maximum | report only (mg/L) | all year | S066 |
Cited limits by parameter: Minnesota's rules and the federal ones.
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