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Sewage treatment plant, major discharger, Marshall, Minnesota. NPDES permit MN0022179, in force until Feb 28, 2029. Last 12 months: over a limit 2 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit |
|---|---|---|---|
| December 2025 | pH, monthly minimum | .7 | ≥ 6 SU |
| June 2026 | pH, monthly minimum | 4.4 | ≥ 6 SU |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Specific conductance | monthly maximum | report only (umho/cm) | all year | D160 |
| Oxygen, dissolved [DO] | monthly minimum | ≥ 7.5 mg/L | all year | D160 |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | all year | D160 |
| pH | monthly minimum | ≥ 6 SU | all year | D160 |
| pH | monthly maximum | ≤ 9 SU | all year | D160 |
| Bicarbonate ion- [as HCO3] | monthly maximum | report only (mg/L) | all year | D160 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | D160 |
| Solids, total suspended | monthly maximum | report only (mg/L) | May, Sep | D160 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | D160 |
| Solids, total suspended | monthly average | ≤ 510 kg/d | all year | D160 |
| Solids, total suspended | maximum weekly average | ≤ 765 kg/d | all year | D160 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | D160 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | D160 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 9.4 mg/L | Jan, Feb, Mar, Dec | D160 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.4 mg/L | Apr, May | D160 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.3 mg/L | Oct, Nov | D160 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.1 mg/L | Jun–Sep | D160 |
| Nitrogen, ammonia total [as N] | monthly average | report only (kg/d) | all year | D160 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 159.9 kg/d | Jan, Feb, Mar, Dec | D160 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 40.8 kg/d | Apr, May | D160 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 39.1 kg/d | Oct, Nov | D160 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 18.7 kg/d | Jun–Sep | D160 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | D160 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | D160 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | D160 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | all year | D160 |
| Phosphorus, total [as P] | annual total | ≤ 4973 kg/yr | all year | D160 |
| Calcium, total [as Ca] | monthly maximum | report only (mg/L) | all year | D160 |
| Magnesium, total [as Mg] | monthly maximum | report only (mg/L) | all year | D160 |
| Sodium, total [as Na] | monthly maximum | report only (mg/L) | all year | D160 |
| Potassium, total [as K] | monthly maximum | report only (mg/L) | all year | D160 |
| Chloride [as Cl] | monthly average | ≤ 468 mg/L | all year | D160 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | all year | D160 |
| Copper, total [as Cu] | monthly average | ≤ 26 mg/L | Jan, Apr, Jul, Oct | D160 |
| Copper, total [as Cu] | daily maximum | ≤ 42 mg/L | Jan, Apr, Jul, Oct | D160 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | all year | D160 |
| Coliform, fecal MPN + membrane ftl 44.5 C | monthly geometric mean | ≤ 200 #/100mL | Apr–Oct | D160 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D160 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D160 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D160 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | all year | D160 |
| Mercury, dissolved [as Hg] | monthly maximum | report only (ng/L) | May, Sep | D160 |
| Mercury, total [as Hg] | monthly maximum | report only (ng/L) | May, Sep | D160 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | D160 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 5 mg/L | all year | D160 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 40 mg/L | all year | D160 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 10 mg/L | all year | D160 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 425 kg/d | all year | D160 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 85 kg/d | all year | D160 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 680 kg/d | all year | D160 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 170 kg/d | all year | D160 |
| BOD, carb-5 day, 20 deg C, percent removal | monthly average minimum | ≥ 85 % | all year | D160 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | D160 |
| Precipitation, total defined period/in | monthly total | report only (in) | all year | S164 |
| pH | monthly minimum | report only (SU) | all year | S164 |
| pH | monthly maximum | report only (SU) | all year | S164 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | S164 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | S164 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | S164 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | S164 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | S164 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | S164 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | S164 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | S164 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | S164 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | S164 |
| BOD, carbonaceous [5 day, 20 C] | monthly maximum | report only (mg/L) | all year | S164 |
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | Jan, Feb, Mar, Dec | W161 |
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | Apr–Nov | W161 |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | Jan, Feb, Mar, Dec | W161 |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | Apr–Nov | W161 |
| pH | monthly maximum | report only (SU) | Jan, Feb, Mar, Dec | W161 |
| pH | monthly maximum | report only (SU) | Apr–Nov | W161 |
| Nitrogen, ammonia total [as N] | monthly maximum | report only (mg/L) | Apr–Nov | W161 |
| Nitrogen, ammonia total [as N] | monthly maximum | report only (mg/L) | Jan, Feb, Mar, Dec | W161 |
| Nitrogen, ammonia, tot unionized [as N] | monthly maximum | report only (mg/L) | Jan, Feb, Mar, Dec | W161 |
| Nitrogen, ammonia, tot unionized [as N] | monthly maximum | report only (mg/L) | Apr–Nov | W161 |
| Effluent dilution ratio | monthly minimum | report only (Ratio) | Apr–Nov | W161 |
| Effluent dilution ratio | monthly minimum | report only (Ratio) | Jan, Feb, Mar, Dec | W161 |
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | Apr–Nov | W162 |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | Apr–Nov | W162 |
| pH | monthly maximum | report only (SU) | Apr–Nov | W162 |
| Nitrogen, ammonia total [as N] | monthly maximum | report only (mg/L) | Apr–Nov | W162 |
| Nitrogen, ammonia, tot unionized [as N] | monthly maximum | report only (mg/L) | Apr–Nov | W162 |
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | Jan, Feb, Mar, Dec | W163 |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | Jan, Feb, Mar, Dec | W163 |
| pH | monthly maximum | report only (SU) | Jan, Feb, Mar, Dec | W163 |
| Nitrogen, ammonia total [as N] | monthly maximum | report only (mg/L) | Jan, Feb, Mar, Dec | W163 |
| Nitrogen, ammonia, tot unionized [as N] | monthly maximum | report only (mg/L) | Jan, Feb, Mar, Dec | W163 |
Cited limits by parameter: Minnesota's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/MN0022179 · MCP: https://passage-data.com/mcp