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Industrial Organic Chemicals, Granite Falls, Minnesota. NPDES permit MN0066800 expired May 31, 2025; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | maximum daily average | ≤ 86 deg F | all year | D005 |
| Specific conductance | monthly average | ≤ 1403 umho/cm | all year | D005 |
| Specific conductance | daily maximum | ≤ 2430 umho/cm | all year | D005 |
| pH | instantaneous minimum | ≥ 6 SU | all year | D005 |
| pH | instantaneous maximum | ≤ 9 SU | all year | D005 |
| Bicarbonate ion- [as HCO3] | monthly average | ≤ 8.5 mg/L | all year | D005 |
| Bicarbonate ion- [as HCO3] | daily maximum | ≤ 15 mg/L | all year | D005 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | D005 |
| Solids, total suspended | daily maximum | ≤ 52 mg/L | all year | D005 |
| Solids, total suspended | monthly maximum | report only (mg/L) | Apr, Sep | D005 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Apr, Sep | D005 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Apr, Sep | D005 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Apr, Sep | D005 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Apr, Sep | D005 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Jun–Sep | D005 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | D005 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | D005 |
| Phosphorus, total [as P] | monthly average | ≤ 1.1 kg/d | Jun–Sep | D005 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | D005 |
| Phosphorus, total [as P] | annual total | ≤ 159 kg/yr | all year | D005 |
| Calcium, total [as Ca] | monthly average | report only (mg/L) | all year | D005 |
| Calcium, total [as Ca] | daily maximum | report only (mg/L) | all year | D005 |
| Magnesium, total [as Mg] | monthly average | report only (mg/L) | all year | D005 |
| Magnesium, total [as Mg] | daily maximum | report only (mg/L) | all year | D005 |
| Sodium, total [as Na] | monthly average | report only (mg/L) | all year | D005 |
| Sodium, total [as Na] | daily maximum | report only (mg/L) | all year | D005 |
| Potassium, total [as K] | monthly average | report only (mg/L) | all year | D005 |
| Potassium, total [as K] | daily maximum | report only (mg/L) | all year | D005 |
| Chloride [as Cl] | monthly average | ≤ 218 mg/L | all year | D005 |
| Chloride [as Cl] | daily maximum | ≤ 377 mg/L | all year | D005 |
| Sulfate, total [as SO4] | monthly average | ≤ 1403 mg/L | all year | D005 |
| Sulfate, total [as SO4] | daily maximum | ≤ 2430 mg/L | all year | D005 |
| Boron, total [as B] | monthly average | ≤ 701 ug/L | all year | D005 |
| Boron, total [as B] | daily maximum | ≤ 1215 ug/L | all year | D005 |
| Aluminum, total [as Al] | monthly average | ≤ 125 ug/L | all year | D005 |
| Aluminum, total [as Al] | daily maximum | ≤ 205 ug/L | all year | D005 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly average | ≤ 701 mg/L | all year | D005 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | daily maximum | ≤ 1215 mg/L | all year | D005 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D005 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D005 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D005 |
| Chlorine, total residual | daily maximum | ≤ .038 mg/L | all year | D005 |
| Solids, total dissolved | monthly average | ≤ 982 mg/L | all year | D005 |
| Solids, total dissolved | daily maximum | ≤ 1701 mg/L | all year | D005 |
| Mercury, dissolved [as Hg] | monthly maximum | report only (ng/L) | Apr, Sep | D005 |
| Mercury, total [as Hg] | monthly maximum | report only (ng/L) | Apr, Sep | D005 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 5 mg/L | all year | D005 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 8.7 mg/L | all year | D005 |
| Specific conductance | monthly average | report only (umho/cm) | all year | D006 |
| pH | instantaneous minimum | ≥ 6 SU | all year | D006 |
| pH | instantaneous maximum | ≤ 9 SU | all year | D006 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | D006 |
| Solids, total suspended | daily maximum | ≤ 44 mg/L | all year | D006 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | D006 |
| Organics, gasoline range | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | D006 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D006 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D006 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D006 |
| Ethanol | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | D006 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | D006 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 36 mg/L | all year | D006 |
| Duration of discharge | monthly total | report only (d/mo) | all year | D006 |
| Specific conductance | monthly average | report only (umho/cm) | all year | D007 |
| pH | instantaneous minimum | ≥ 6 SU | all year | D007 |
| pH | instantaneous maximum | ≤ 9 SU | all year | D007 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | D007 |
| Solids, total suspended | daily maximum | ≤ 44 mg/L | all year | D007 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | D007 |
| Organics, gasoline range | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | D007 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D007 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D007 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D007 |
| Ethanol | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | D007 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | D007 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 36 mg/L | all year | D007 |
| Duration of discharge | monthly total | report only (d/mo) | all year | D007 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | S012 |
| Flow, in conduit or thru treatment plant | annual average | report only (MGD) | Dec | S012 |
| Flow, in conduit or thru treatment plant | instantaneous maximum | ≤ 1.44 MGD | all year | S012 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | S012 |
Cited limits by parameter: Minnesota's rules and the federal ones.
Same industry: the 15 Chemicals and Allied Products permits in Minnesota.
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