Mountain Iron city of

NPDES permit MN0040835 · Minor POTW · effective, expires 2028-12-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

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

0values over a limit
0required values missing, on 0 form(s)
0of 37 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 21 days after each monitoring period ends (the most common figure among MN permits in EPA's filings — check your permit).

Limits in force (52)

OutfallParameterStatisticLimitMonths
D007Oxygen, dissolved [DO]MO MIN report only all year
D007pHMO MIN >= 6 SU all year
D007pHMO MAX <= 9 SU all year
D007Solids, total suspendedMO AVG report only May, Sep
D007Solids, total suspendedMO AVG <= 30 mg/L all year
D007Solids, total suspendedDAILY MX report only May, Sep
D007Solids, total suspendedMX WK AV <= 45 mg/L all year
D007Solids, total suspendedMO AVG <= 62.4 kg/d all year
D007Solids, total suspendedMX WK AV <= 93.6 kg/d all year
D007Nitrogen, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
D007Nitrogen, ammonia total [as N]MO AVG report only Mar, Sep
D007Nitrogen, Kjeldahl, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
D007Nitrite + Nitrate total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
D007Phosphorus, total [as P]MO AVG <= 1 mg/L all year
D007Phosphorus, total [as P]MO AVG report only all year
D007Phosphorus, total [as P]ANNL TOT report only all year
D007Coliform, fecal MPN + membrane ftl 44.5 CMO GEOMN <= 200 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
D007Flow, in conduit or thru treatment plantMO AVG report only all year
D007Flow, in conduit or thru treatment plantMO MAX report only all year
D007Flow, in conduit or thru treatment plantMO TOTAL report only all year
D007Chlorine, total residualDAILY MX <= .038 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
D007Solids, total dissolvedMO AVG report only Mar, Sep
D007Mercury, dissolved [as Hg]MO AVG report only May, Sep
D007Mercury, dissolved [as Hg]DAILY MX report only May, Sep
D007Mercury, total [as Hg]MO AVG <= 1.82 ng/L May, Sep
D007Mercury, total [as Hg]DAILY MX <= 3.16 ng/L May, Sep
D007BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L all year
D007BOD, carbonaceous [5 day, 20 C]MX WK AV <= 40 mg/L all year
D007BOD, carbonaceous [5 day, 20 C]MO AVG <= 52 kg/d all year
D007BOD, carbonaceous [5 day, 20 C]MX WK AV <= 83.2 kg/d all year
D007BOD, carb-5 day, 20 deg C, percent removalMO AV MN >= 85 % all year
D007Solids, suspended percent removalMO AV MN >= 85 % all year
S008Precipitation, total defined period/inMO TOTAL report only all year
S008pHMO MIN report only all year
S008pHMO MAX report only all year
S008Solids, total suspendedMO AVG report only May, Sep
S008Solids, total suspendedMO AVG report only all year
S008Solids, total suspendedDAILY MX report only May, Sep
S008Solids, total suspendedMO MAX report only all year
S008Nitrogen, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
S008Nitrogen, Kjeldahl, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
S008Nitrite + Nitrate total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
S008Phosphorus, total [as P]MO AVG report only all year
S008Flow, in conduit or thru treatment plantMO AVG report only all year
S008Flow, in conduit or thru treatment plantMO MAX report only all year
S008Flow, in conduit or thru treatment plantMO TOTAL report only all year
S008Mercury, dissolved [as Hg]MO AVG report only May, Sep
S008Mercury, dissolved [as Hg]DAILY MX report only May, Sep
S008Mercury, total [as Hg]MO AVG report only May, Sep
S008Mercury, total [as Hg]DAILY MX report only May, Sep
S008BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
S008BOD, carbonaceous [5 day, 20 C]MO MAX report only all year

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