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Sewage treatment plant, Mahnomen, Minnesota. NPDES permit MN0024066, in force until Sep 25, 2029. Last 12 months: no values over a limit, 2 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | minimum | report only (SU) | Mar, Jun, Sep, Dec | 001 |
| pH | maximum | report only (SU) | Mar, Jun, Sep, Dec | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Rainfall | monthly total | report only (in) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | Jun, Dec | 001 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | Jun, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 002 |
| pH | daily minimum | ≥ 6 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | ≤ 45 mg/L | all year | 002 |
| Solids, total suspended | weekly average | ≤ 65 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 177 kg/d | all year | 002 |
| Solids, total suspended | weekly average | ≤ 256 kg/d | all year | 002 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Oil and grease [soxhlet extr.] tot. | monthly average | report only (mg/L) | Jun, Dec | 002 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jun, Dec | 002 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | all year | 002 |
| Phosphorus, total [as P] | 12-month total | ≤ 934 kg/yr | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | 002 |
| E. coli | monthly average | ≤ 126 #/100mL | Apr–Oct | 002 |
| E. coli | daily maximum | ≤ 235 #/100mL | Apr–Oct | 002 |
| Solids, total dissolved | monthly average | report only (mg/L) | Jun, Dec | 002 |
| Mercury, dissolved [as Hg] | monthly average | report only (ng/L) | Mar, Jun, Sep, Dec | 002 |
| Mercury, dissolved [as Hg] | daily maximum | report only (ng/L) | Mar, Jun, Sep, Dec | 002 |
| Mercury, total [as Hg] | monthly average | ≤ 10.4 ng/L | all year | 002 |
| Mercury, total [as Hg] | daily maximum | ≤ 20.2 ng/L | all year | 002 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | all year | 002 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 98 kg/d | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 157 kg/d | all year | 002 |
| BOD, carb-5 day, 20 deg C, percent removal | minimum % removal | ≥ 85 % | all year | 002 |
| Solids, suspended percent removal | minimum % removal | ≥ 65 % | all year | 002 |
| Outfall observation,visual, y/n response | monthly average | report only (Y=0;N=1) | all year | 002 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 003 |
| pH | daily minimum | ≥ 6 SU | all year | 003 |
| pH | daily maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | monthly average | ≤ 45 mg/L | all year | 003 |
| Solids, total suspended | weekly average | ≤ 65 mg/L | all year | 003 |
| Solids, total suspended | monthly average | ≤ 528 kg/d | all year | 003 |
| Solids, total suspended | weekly average | ≤ 763 kg/d | all year | 003 |
| Solids, total suspended | monthly average | report only (mg/L) | Mar, Jun, Sep, Dec | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 003 |
| Oil and grease [soxhlet extr.] tot. | monthly average | report only (mg/L) | Jun, Dec | 003 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jun, Dec | 003 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 003 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | 003 |
| E. coli | monthly average | ≤ 126 #/100mL | Apr–Oct | 003 |
| E. coli | daily maximum | ≤ 235 #/100mL | Apr–Oct | 003 |
| Solids, total dissolved [TDS] | monthly average | report only (mg/L) | Jun, Dec | 003 |
| Mercury, dissolved [as Hg] | monthly average | report only (ng/L) | Jun, Dec | 003 |
| Mercury, dissolved [as Hg] | daily maximum | report only (ng/L) | Jun, Dec | 003 |
| Mercury, dissolved [as Hg] | monthly average | report only (ng/L) | Jun, Dec | 003 |
| Mercury, dissolved [as Hg] | daily maximum | report only (ng/L) | Jun, Dec | 003 |
| Mercury, total [as Hg] | monthly average | ≤ 10.4 ng/L | all year | 003 |
| Mercury, total [as Hg] | daily maximum | ≤ 20.2 ng/L | all year | 003 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | Jun, Dec | 003 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | Jun, Dec | 003 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 293 kg/d | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 469 kg/d | all year | 003 |
| BOD, carb-5 day, 20 deg C, percent removal | minimum % removal | ≥ 85 % | all year | 003 |
| Solids, suspended percent removal | minimum % removal | ≥ 65 % | all year | 003 |
| Outfall observation,visual, y/n response | monthly average | report only (Y=0;N=1) | all year | 003 |
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/MN0024066 · MCP: https://passage-data.com/mcp