Central Iron Range Sanitary Sewer District

NPDES permit MN0020117 · Major POTW · effective, expires 2027-01-31 · 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

2values over a limit
8required values missing, on 2 form(s)
0of 37 forms filed late

Last period with anything received: 2026-07-31. Most often over: pH (1), Phosphorus, total [as P] (1).

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 (57)

OutfallParameterStatisticLimitMonths
D018Oxygen, dissolved [DO]MO MIN report only all year
D018pHMO MIN >= 6 SU all year
D018pHMO MAX <= 9 SU all year
D018Solids, total suspendedMO AVG report only May, Sep
D018Solids, total suspendedMO AVG <= 30 mg/L all year
D018Solids, total suspendedDAILY MX report only May, Sep
D018Solids, total suspendedMX WK AV <= 45 mg/L all year
D018Solids, total suspendedMO AVG <= 145.8 kg/d all year
D018Solids, total suspendedMX WK AV <= 217 kg/d all year
D018Nitrogen, total [as N]MO AVG report only all year
D018Nitrogen, ammonia total [as N]MO AVG <= 24 mg/L Apr, May
D018Nitrogen, ammonia total [as N]MO AVG <= 13 mg/L Oct, Nov
D018Nitrogen, ammonia total [as N]MO AVG <= 3.5 mg/L Jun, Jul, Aug, Sep
D018Nitrogen, ammonia total [as N]MO AVG <= 18 mg/L Jan, Feb, Mar, Dec
D018Nitrogen, ammonia total [as N]MO AVG <= 226.8 kg/d Apr, May
D018Nitrogen, ammonia total [as N]MO AVG <= 122.8 kg/d Oct, Nov
D018Nitrogen, ammonia total [as N]MO AVG <= 33.1 kg/d Jun, Jul, Aug, Sep
D018Nitrogen, ammonia total [as N]MO AVG <= 170.1 kg/d Jan, Feb, Mar, Dec
D018Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
D018Nitrite + Nitrate total [as N]MO AVG report only all year
D018Phosphorus, total [as P]MO AVG <= 1 mg/L all year
D018Phosphorus, total [as P]MO AVG report only all year
D018Phosphorus, total [as P]ANNL TOT <= 1644 kg/yr all year
D018Copper, total [as Cu]QRTR AVG report only Mar, Jun, Sep, Dec
D018Coliform, fecal MPN + membrane ftl 44.5 CMO GEOMN <= 200 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
D018Flow, in conduit or thru treatment plantMO AVG report only all year
D018Flow, in conduit or thru treatment plantMO MAX report only all year
D018Flow, in conduit or thru treatment plantMO TOTAL report only all year
D018Chlorine, total residualDAILY MX <= .038 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
D018Solids, total dissolvedMO AVG report only Mar, Sep
D018Mercury, dissolved [as Hg]MO AVG report only May, Sep
D018Mercury, dissolved [as Hg]DAILY MX report only May, Sep
D018Mercury, total [as Hg]MO AVG <= 1.8 ng/L May, Sep
D018Mercury, total [as Hg]DAILY MX <= 3.2 ng/L May, Sep
D018BOD, carbonaceous [5 day, 20 C]MO AVG <= 15 mg/L all year
D018BOD, carbonaceous [5 day, 20 C]MX WK AV <= 25 mg/L all year
D018BOD, carbonaceous [5 day, 20 C]MO AVG <= 74.7 kg/d all year
D018BOD, carbonaceous [5 day, 20 C]MX WK AV <= 123.4 kg/d all year
D018BOD, carb-5 day, 20 deg C, percent removalMO AV MN >= 85 % all year
D018Solids, suspended percent removalMO AV MN >= 85 % all year
S024Precipitation, total defined period/inMO TOTAL report only all year
S024pHMO MIN report only all year
S024pHMO MAX report only all year
S024Solids, total suspendedMO AVG report only May, Sep
S024Solids, total suspendedMO AVG report only all year
S024Solids, total suspendedMO MAX report only all year
S024Nitrogen, total [as N]MO AVG report only all year
S024Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
S024Nitrite + Nitrate total [as N]MO AVG report only all year
S024Phosphorus, total [as P]MO AVG report only all year
S024Flow, in conduit or thru treatment plantMO AVG report only all year
S024Flow, in conduit or thru treatment plantMO MAX report only all year
S024Flow, in conduit or thru treatment plantMO TOTAL report only all year
S024Mercury, dissolved [as Hg]MO AVG report only May, Sep
S024Mercury, total [as Hg]MO AVG report only May, Sep
S024BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
S024BOD, 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