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Minnesota Power a division of ALLETE Inc

Electric Services, major discharger, Cohasset, Minnesota. NPDES permit MN0001007, in force until Jan 31, 2030. Last 12 months: over a limit 4 times (last June 2026), 11 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 11 days after each period: outfall D010 form A1 monthly (40 values), outfall D011 form A1 monthly (2 values), outfall S072 form A1 monthly (1 value), outfall S073 form A1 monthly (3 values), outfall S074 form A1 monthly (3 values), outfall W068 form A1 monthly (16 values), and 2 more forms
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 90 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
March 2026Chlorine, total residual, daily maximum.11≤ .038 mg/L189%
March 2026Copper, total [as Cu], daily maximum9070≤ 423 ug/L2044%
March 2026Copper, total [as Cu], monthly average2093≤ 319 ug/L556%
June 2026Chlorine, total residual, daily maximum1≤ .038 mg/L2532%

Limits in force (91)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all yearD010
pHinstantaneous minimum≥ 6 SUall yearD010
pHinstantaneous maximum≤ 9 SUall yearD010
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD010
Solids, total suspendeddaily maximum≤ 76 mg/Lall yearD010
Solids, total suspendedmonthly average≤ 357 kg/dall yearD010
Solids, total suspendeddaily maximum≤ 898 kg/dall yearD010
Oil and grease, hexane extr methodmonthly average≤ 10 mg/Lall yearD010
Oil and grease, hexane extr methoddaily maximum≤ 15 mg/Lall yearD010
Oil and grease, hexane extr methodmonthly average≤ 118 kg/dall yearD010
Oil and grease, hexane extr methoddaily maximum≤ 177 kg/dall yearD010
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD010
Nitrogen, total [as N]daily maximumreport only (mg/L)Mar, Jun, Sep, DecD010
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD010
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)Mar, Jun, Sep, DecD010
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD010
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)Mar, Jun, Sep, DecD010
Phosphorus, total [as P]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD010
Phosphorus, total [as P]daily maximumreport only (mg/L)Mar, Jun, Sep, DecD010
Magnesium, total [as Mg]daily maximumreport only (mg/L)Mar, Jun, Sep, DecD010
Sulfate, total [as SO4]monthly averagereport only (mg/L)all yearD010
Sulfate, total [as SO4]monthly average≤ 17681 kg/dall yearD010
Arsenic, total [as As]daily maximumreport only (ug/L)Mar, Jun, Sep, DecD010
Boron, total [as B]daily maximumreport only (mg/L)Mar, Jun, Sep, DecD010
Chromium, hexavalent [as Cr]daily maximumreport only (ug/L)Mar, Jun, Sep, DecD010
Copper, total [as Cu]monthly average≤ 319 ug/Lall yearD010
Copper, total [as Cu]daily maximum≤ 423 ug/Lall yearD010
Lead, total [as Pb]daily maximumreport only (ug/L)Jun, SepD010
Manganese, total [as Mn]daily maximumreport only (mg/L)Mar, Jun, Sep, DecD010
Lithium, total [as Li]daily maximumreport only (mg/L)Mar, Jun, Sep, DecD010
Hardness, Ca Mg Calculated [mg/L as CaCO3]daily maximumreport only (mg/L)Mar, Jun, Sep, DecD010
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD010
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD010
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD010
Chlorine, total residualmonthly average≤ .2 mg/Lall yearD010
Chlorine, total residualdaily maximum≤ .038 mg/Lall yearD010
Chlorinationcumulative total≤ 2 hr/dall yearD010
Solids, total dissolveddaily maximumreport only (mg/L)Mar, Jun, Sep, DecD010
Mercury, total [as Hg]monthly average≤ 10 ng/Lall yearD010
Mercury, total [as Hg]daily maximum≤ 20 ng/Lall yearD010
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD011
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD011
pHmonthly minimum≥ 6 SUall yearS067
pHdaily maximum≤ 9 SUall yearS067
Solids, total suspendedmonthly average≤ 30 mg/Lall yearS067
Solids, total suspendeddaily maximum≤ 100 mg/Lall yearS067
Copper, total [as Cu]monthly average≤ 1 mg/Lall yearS067
Copper, total [as Cu]daily maximum≤ 1 mg/Lall yearS067
Iron, total [as Fe]monthly average≤ 1 mg/Lall yearS067
Iron, total [as Fe]daily maximum≤ 1 mg/Lall yearS067
Oil and greasemonthly average≤ 15 mg/Lall yearS067
Oil and greasedaily maximum≤ 20 mg/Lall yearS067
Specific conductancemonthly averagereport only (umho/cm)all yearS072
Specific conductancemonthly averagereport only (umho/cm)all yearS073
Cycles Of Concentrationdaily minimumreport only (c)all yearS073
Cycles Of Concentrationdaily averagereport only (c)all yearS073
Specific conductancemonthly averagereport only (umho/cm)all yearS074
Cycles Of Concentrationdaily minimumreport only (c)all yearS074
Cycles Of Concentrationdaily averagereport only (c)all yearS074
Specific conductancemonthly maximumreport only (umho/cm)Apr–OctW068
Sulfate [as S]monthly maximumreport only (mg/L)Apr–OctW068
pHmonthly minimumreport only (SU)Apr–OctW068
pHmonthly maximumreport only (SU)Apr–OctW068
Bicarbonate ion- [as HCO3]monthly maximumreport only (mg/L)Apr–OctW068
Nitrite + Nitrate total [as N]monthly maximumreport only (mg/L)Apr–OctW068
Calcium, dissolved [as Ca]monthly maximumreport only (mg/L)Apr–OctW068
Magnesium, dissolved [as Mg]monthly maximumreport only (mg/L)Apr–OctW068
Sodium, total [as Na]monthly maximumreport only (mg/L)Apr–OctW068
Potassium, dissolved [as K]monthly maximumreport only (mg/L)Apr–OctW068
Chloride [as Cl]monthly maximumreport only (mg/L)Apr–OctW068
Fluoride, total [as F]monthly maximumreport only (mg/L)Apr–OctW068
Iron, dissolved [as Fe]monthly maximumreport only (mg/L)Apr–OctW068
Manganese, dissolved [as Mn]monthly maximumreport only (ug/L)Apr–OctW068
Hardness, Ca Mg Calculated [mg/L as CaCO3]monthly maximumreport only (mg/L)Apr–OctW068
Solids, total dissolvedmonthly maximumreport only (mg/L)Apr–OctW068
Specific conductancemonthly maximumreport only (umho/cm)Apr–OctW070
Sulfate [as S]monthly maximumreport only (mg/L)Apr–OctW070
pHmonthly minimumreport only (SU)Apr–OctW070
pHmonthly maximumreport only (SU)Apr–OctW070
Bicarbonate ion- [as HCO3]monthly maximumreport only (mg/L)Apr–OctW070
Nitrite + Nitrate total [as N]monthly maximumreport only (mg/L)Apr–OctW070
Calcium, dissolved [as Ca]monthly maximumreport only (mg/L)Apr–OctW070
Magnesium, dissolved [as Mg]monthly maximumreport only (mg/L)Apr–OctW070
Sodium, total [as Na]monthly maximumreport only (mg/L)Apr–OctW070
Potassium, dissolved [as K]monthly maximumreport only (mg/L)Apr–OctW070
Chloride [as Cl]monthly maximumreport only (mg/L)Apr–OctW070
Fluoride, total [as F]monthly maximumreport only (mg/L)Apr–OctW070
Iron, dissolved [as Fe]monthly maximumreport only (mg/L)Apr–OctW070
Manganese, dissolved [as Mn]monthly maximumreport only (ug/L)Apr–OctW070
Hardness, Ca Mg Calculated [mg/L as CaCO3]monthly maximumreport only (mg/L)Apr–OctW070
Solids, total dissolvedmonthly maximumreport only (mg/L)Apr–OctW070

How strict are these limits?

Cited limits by parameter: Minnesota's rules and the federal ones.

Same industry: the 12 Electric Services permits in Minnesota.

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Your permit document is the final word. As JSON: /api/v1/permits/MN0001007 · MCP: https://passage-data.com/mcp