US Steel Corp - Keetac

NPDES permit MN0031879 · Minor NON-POTW · administratively continued, expires 2016-10-31 · 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.

This permit expired on 2016-10-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

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

0values over a limit
0required values missing, on 0 form(s)
0of 34 forms filed late

Last period with anything received: 2026-06-30.

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 (51)

OutfallParameterStatisticLimitMonths
013Specific conductanceQB report only Mar, Jun, Sep, Dec
013pHINST MIN >= 6 SU all year
013pHINST MAX <= 9 SU all year
013Solids, total suspendedMO AVG <= 20 mg/L Mar, Jun, Sep, Dec
013Solids, total suspendedDAILY MX <= 30 mg/L Mar, Jun, Sep, Dec
013Sulfate, total [as SO4]MO AVG report only all year
013Sulfate, total [as SO4]MO MAX report only all year
013Iron, dissolved [as Fe]MO AVG <= 1 mg/L all year
013Iron, dissolved [as Fe]DAILY MX <= 2 mg/L all year
013Hardness, Ca Mg Calculated [mg/L as CaCO3]QB report only Mar, Jun, Sep, Dec
013Flow, in conduit or thru treatment plantMO AVG report only all year
013Flow, in conduit or thru treatment plantMO TOTAL report only all year
013Solids, total dissolvedQB report only Mar, Jun, Sep, Dec
013Mercury, total [as Hg]SINGSAMP report only Mar, Jun, Sep, Dec
040pHINST MIN >= 6 SU Mar, Jun, Sep, Dec
040pHINST MAX <= 9 SU Mar, Jun, Sep, Dec
040Solids, total suspendedDAILY MX <= 30 mg/L Mar, Jun, Sep, Dec
040Flow, in conduit or thru treatment plantQRTR AVG report only Mar, Jun, Sep, Dec
040Flow, in conduit or thru treatment plantQT report only Mar, Jun, Sep, Dec
050Temperature, water deg. fahrenheitMO AVG report only Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
050Temperature, water deg. fahrenheitDAILY MX report only Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
050Specific conductanceSINGSAMP report only Mar, Jun, Sep, Dec
050pHINST MIN >= 6.5 SU all year
050pHINST MAX <= 8.5 SU all year
050Solids, total suspendedMO AVG <= 20 mg/L all year
050Solids, total suspendedDAILY MX <= 30 mg/L all year
050Oil and grease, hexane extr methodQRTR AVG <= .5 mg/L Mar, Jun, Sep, Dec
050Oil and grease, hexane extr methodDAILY MX <= 5 mg/L Mar, Jun, Sep, Dec
050Nitrogen, ammonia, tot unionized [as N]MO AVG <= .04 mg/L Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
050Nitrogen, ammonia, tot unionized [as N]DAILY MX report only Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
050Sulfate, total [as SO4]MO AVG report only all year
050Sulfate, total [as SO4]MO MAX report only all year
050Iron, dissolved [as Fe]MO AVG <= 1 mg/L all year
050Iron, dissolved [as Fe]DAILY MX <= 2 mg/L all year
050Flow, in conduit or thru treatment plantMO AVG report only all year
050Flow, in conduit or thru treatment plantMO TOTAL report only all year
050Mercury, total [as Hg]SINGSAMP report only Mar, Jun, Sep, Dec
080Specific conductanceSINGSAMP report only Mar, Jun, Sep, Dec
080pHINST MIN >= 6.5 SU all year
080pHINST MAX <= 8.5 SU all year
080Solids, total suspendedQRTR AVG <= 20 mg/L Mar, Jun, Sep, Dec
080Solids, total suspendedDAILY MX <= 30 mg/L Mar, Jun, Sep, Dec
080Oil and grease, hexane extr methodQRTR AVG <= .5 mg/L Mar, Jun, Sep, Dec
080Oil and grease, hexane extr methodDAILY MX <= 5 mg/L Mar, Jun, Sep, Dec
080Sulfate, total [as SO4]MO AVG report only all year
080Sulfate, total [as SO4]ANNL MAX report only all year
080Iron, dissolved [as Fe]MO AVG <= 1 mg/L all year
080Iron, dissolved [as Fe]DAILY MX <= 2 mg/L all year
080Flow, in conduit or thru treatment plantMO AVG report only all year
080Flow, in conduit or thru treatment plantMO TOTAL report only all year
080Mercury, total [as Hg]SINGSAMP report only Mar, Jun, Sep, Dec

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