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Sewage treatment plant, major discharger, Chisholm, Minnesota. NPDES permit MN0020117, in force until Jan 31, 2027. Last 12 months: over a limit 2 times (last January 2026), 8 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Phosphorus, total [as P], monthly average | 1.2 | ≤ 1 mg/L | 20% |
| January 2026 | pH, monthly maximum | 66 | ≤ 9 SU | — |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | all year | D018 |
| pH | monthly minimum | ≥ 6 SU | all year | D018 |
| pH | monthly maximum | ≤ 9 SU | all year | D018 |
| Solids, total suspended | monthly average | report only (mg/L) | May, Sep | D018 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | D018 |
| Solids, total suspended | daily maximum | report only (mg/L) | May, Sep | D018 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | D018 |
| Solids, total suspended | monthly average | ≤ 145.8 kg/d | all year | D018 |
| Solids, total suspended | maximum weekly average | ≤ 217 kg/d | all year | D018 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | D018 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 24 mg/L | Apr, May | D018 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 13 mg/L | Oct, Nov | D018 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.5 mg/L | Jun–Sep | D018 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 18 mg/L | Jan, Feb, Mar, Dec | D018 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 226.8 kg/d | Apr, May | D018 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 122.8 kg/d | Oct, Nov | D018 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 33.1 kg/d | Jun–Sep | D018 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 170.1 kg/d | Jan, Feb, Mar, Dec | D018 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | D018 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | D018 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | D018 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | all year | D018 |
| Phosphorus, total [as P] | annual total | ≤ 1644 kg/yr | all year | D018 |
| Copper, total [as Cu] | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | D018 |
| Coliform, fecal MPN + membrane ftl 44.5 C | monthly geometric mean | ≤ 200 #/100mL | Apr–Oct | D018 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D018 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D018 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D018 |
| Chlorine, total residual | daily maximum | ≤ .038 mg/L | Apr–Oct | D018 |
| Solids, total dissolved | monthly average | report only (mg/L) | Mar, Sep | D018 |
| Mercury, dissolved [as Hg] | monthly average | report only (ng/L) | May, Sep | D018 |
| Mercury, dissolved [as Hg] | daily maximum | report only (ng/L) | May, Sep | D018 |
| Mercury, total [as Hg] | monthly average | ≤ 1.8 ng/L | May, Sep | D018 |
| Mercury, total [as Hg] | daily maximum | ≤ 3.2 ng/L | May, Sep | D018 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | all year | D018 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 25 mg/L | all year | D018 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 74.7 kg/d | all year | D018 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 123.4 kg/d | all year | D018 |
| BOD, carb-5 day, 20 deg C, percent removal | monthly average minimum | ≥ 85 % | all year | D018 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | D018 |
| Precipitation, total defined period/in | monthly total | report only (in) | all year | S024 |
| pH | monthly minimum | report only (SU) | all year | S024 |
| pH | monthly maximum | report only (SU) | all year | S024 |
| Solids, total suspended | monthly average | report only (mg/L) | May, Sep | S024 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | S024 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | S024 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | S024 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | S024 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | S024 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | S024 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | S024 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | S024 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | S024 |
| Mercury, dissolved [as Hg] | monthly average | report only (ng/L) | May, Sep | S024 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | May, Sep | S024 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | S024 |
| BOD, carbonaceous [5 day, 20 C] | monthly maximum | report only (mg/L) | all year | S024 |
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/MN0020117 · MCP: https://passage-data.com/mcp