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Sewage treatment plant, Hawley, Minnesota. NPDES permit MN0020338, in force until Dec 31, 2029. Last 12 months: over a limit 3 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Coliform, fecal MPN + membrane ftl 44.5 C, monthly geometric mean | 344 | ≤ 200 #/100mL | 72% |
| October 2025 | Solids, total suspended, monthly average | 51 | ≤ 45 mg/L | 13% |
| June 2026 | Solids, total suspended, monthly average | 54 | ≤ 45 mg/L | 20% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Specific conductance | monthly average | report only (umho/cm) | all year | D010 |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | all year | D010 |
| pH | monthly minimum | ≥ 6 SU | all year | D010 |
| pH | monthly maximum | ≤ 9 SU | all year | D010 |
| Solids, total suspended | monthly average | ≤ 45 mg/L | all year | D010 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | D010 |
| Solids, total suspended | maximum weekly average | ≤ 65 mg/L | all year | D010 |
| Solids, total suspended | monthly average | ≤ 364.9 kg/d | all year | D010 |
| Solids, total suspended | maximum weekly average | ≤ 527.1 kg/d | all year | D010 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | D010 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | D010 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | D010 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | D010 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | D010 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | all year | D010 |
| Phosphorus, total [as P] | year-to-date total | ≤ 926 kg/yr | all year | D010 |
| Chloride [as Cl] | monthly average | report only (mg/L) | all year | D010 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | D010 |
| Coliform, fecal MPN + membrane ftl 44.5 C | monthly geometric mean | ≤ 200 #/100mL | Apr–Oct | D010 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Mar, Apr, May, Jun, Sep, Oct, Nov, Dec | D010 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Jul, Aug | D010 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | Mar, Apr, May, Jun, Sep, Oct, Nov, Dec | D010 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | Jan, Feb, Jul, Aug | D010 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | Mar, Apr, May, Jun, Sep, Oct, Nov, Dec | D010 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | Jan, Feb, Jul, Aug | D010 |
| Solids, total dissolved | monthly average | report only (mg/L) | all year | D010 |
| Mercury, dissolved [as Hg] | daily maximum | report only (ng/L) | all year | D010 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | D010 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | D010 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 40 mg/L | all year | D010 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 202.7 kg/d | all year | D010 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 324.4 kg/d | all year | D010 |
| Precipitation, total defined period/in | monthly total | report only (in) | all year | S011 |
| pH | quarterly maximum | report only (SU) | Mar, Jun, Sep, Dec | S011 |
| Solids, total suspended | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S011 |
| Nitrogen, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S011 |
| Nitrogen, Kjeldahl, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S011 |
| Nitrite + Nitrate total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S011 |
| Phosphorus, total [as P] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S011 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | S011 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | S011 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | S011 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | S011 |
| BOD, carbonaceous [5 day, 20 C] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S011 |
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/MN0020338 · MCP: https://passage-data.com/mcp