Minnesota Power a division of ALLETE Inc

NPDES permit MN0001007 · Major NON-POTW · effective, expires 2030-01-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

EPA's record, 2025-09-01 to 2026-08-31

4values over a limit
11required values missing, on 6 form(s)
0of 68 forms filed late

Last period with anything received: 2026-07-31. Most often over: Chlorine, total residual (2), Copper, total [as Cu] (2).

Reporting

Reports are due about 11 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (91)

OutfallParameterStatisticLimitMonths
D010Temperature, water deg. fahrenheitDAILY MX report only all year
D010pHINST MIN >= 6 SU all year
D010pHINST MAX <= 9 SU all year
D010Solids, total suspendedMO AVG <= 30 mg/L all year
D010Solids, total suspendedDAILY MX <= 76 mg/L all year
D010Solids, total suspendedMO AVG <= 357 kg/d all year
D010Solids, total suspendedDAILY MX <= 898 kg/d all year
D010Oil and grease, hexane extr methodMO AVG <= 10 mg/L all year
D010Oil and grease, hexane extr methodDAILY MX <= 15 mg/L all year
D010Oil and grease, hexane extr methodMO AVG <= 118 kg/d all year
D010Oil and grease, hexane extr methodDAILY MX <= 177 kg/d all year
D010Nitrogen, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
D010Nitrogen, total [as N]DAILY MX report only Mar, Jun, Sep, Dec
D010Nitrogen, Kjeldahl, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
D010Nitrogen, Kjeldahl, total [as N]DAILY MX report only Mar, Jun, Sep, Dec
D010Nitrite + Nitrate total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
D010Nitrite + Nitrate total [as N]DAILY MX report only Mar, Jun, Sep, Dec
D010Phosphorus, total [as P]QRTR AVG report only Mar, Jun, Sep, Dec
D010Phosphorus, total [as P]DAILY MX report only Mar, Jun, Sep, Dec
D010Magnesium, total [as Mg]DAILY MX report only Mar, Jun, Sep, Dec
D010Sulfate, total [as SO4]MO AVG report only all year
D010Sulfate, total [as SO4]MO AVG <= 17681 kg/d all year
D010Arsenic, total [as As]DAILY MX report only Mar, Jun, Sep, Dec
D010Boron, total [as B]DAILY MX report only Mar, Jun, Sep, Dec
D010Chromium, hexavalent [as Cr]DAILY MX report only Mar, Jun, Sep, Dec
D010Copper, total [as Cu]MO AVG <= 319 ug/L all year
D010Copper, total [as Cu]DAILY MX <= 423 ug/L all year
D010Lead, total [as Pb]DAILY MX report only Jun, Sep
D010Manganese, total [as Mn]DAILY MX report only Mar, Jun, Sep, Dec
D010Lithium, total [as Li]DAILY MX report only Mar, Jun, Sep, Dec
D010Hardness, Ca Mg Calculated [mg/L as CaCO3]DAILY MX report only Mar, Jun, Sep, Dec
D010Flow, in conduit or thru treatment plantMO AVG report only all year
D010Flow, in conduit or thru treatment plantMO MAX report only all year
D010Flow, in conduit or thru treatment plantMO TOTAL report only all year
D010Chlorine, total residualMO AVG <= .2 mg/L all year
D010Chlorine, total residualDAILY MX <= .038 mg/L all year
D010ChlorinationCUM TOTL <= 2 hr/d all year
D010Solids, total dissolvedDAILY MX report only Mar, Jun, Sep, Dec
D010Mercury, total [as Hg]MO AVG <= 10 ng/L all year
D010Mercury, total [as Hg]DAILY MX <= 20 ng/L all year
D011Flow, in conduit or thru treatment plantMO AVG report only all year
D011Flow, in conduit or thru treatment plantMO TOTAL report only all year
S067pHMO MIN >= 6 SU all year
S067pHDAILY MX <= 9 SU all year
S067Solids, total suspendedMO AVG <= 30 mg/L all year
S067Solids, total suspendedDAILY MX <= 100 mg/L all year
S067Copper, total [as Cu]MO AVG <= 1 mg/L all year
S067Copper, total [as Cu]DAILY MX <= 1 mg/L all year
S067Iron, total [as Fe]MO AVG <= 1 mg/L all year
S067Iron, total [as Fe]DAILY MX <= 1 mg/L all year
S067Oil and greaseMO AVG <= 15 mg/L all year
S067Oil and greaseDAILY MX <= 20 mg/L all year
S072Specific conductanceMO AVG report only all year
S073Specific conductanceMO AVG report only all year
S073Cycles Of ConcentrationDAILY MN report only all year
S073Cycles Of ConcentrationDAILY AV report only all year
S074Specific conductanceMO AVG report only all year
S074Cycles Of ConcentrationDAILY MN report only all year
S074Cycles Of ConcentrationDAILY AV report only all year
W068Specific conductanceMO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W068Sulfate [as S]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W068pHMO MIN report only Apr, May, Jun, Jul, Aug, Sep, Oct
W068pHMO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W068Bicarbonate ion- [as HCO3]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W068Nitrite + Nitrate total [as N]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W068Calcium, dissolved [as Ca]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W068Magnesium, dissolved [as Mg]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W068Sodium, total [as Na]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W068Potassium, dissolved [as K]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W068Chloride [as Cl]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W068Fluoride, total [as F]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W068Iron, dissolved [as Fe]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W068Manganese, dissolved [as Mn]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W068Hardness, Ca Mg Calculated [mg/L as CaCO3]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W068Solids, total dissolvedMO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W070Specific conductanceMO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W070Sulfate [as S]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W070pHMO MIN report only Apr, May, Jun, Jul, Aug, Sep, Oct
W070pHMO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W070Bicarbonate ion- [as HCO3]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W070Nitrite + Nitrate total [as N]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W070Calcium, dissolved [as Ca]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W070Magnesium, dissolved [as Mg]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W070Sodium, total [as Na]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W070Potassium, dissolved [as K]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W070Chloride [as Cl]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W070Fluoride, total [as F]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W070Iron, dissolved [as Fe]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W070Manganese, dissolved [as Mn]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W070Hardness, Ca Mg Calculated [mg/L as CaCO3]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct
W070Solids, total dissolvedMO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states