Zimmerman city of

NPDES permit MN0042331 · Minor POTW · effective, expires 2031-05-31 · EPA's file as of 2026-09-19

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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

21values over a limit
0required values missing, on 0 form(s)
0of 37 forms filed late

Last period with anything received: 2026-07-31. Most often over: Phosphorus, total [as P] (12), Nitrogen, ammonia total [as N] (8), BOD, carbonaceous [5 day, 20 C] (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 (56)

OutfallParameterStatisticLimitMonths
D026Specific conductanceMO MAX report only Mar, Sep
D026Oxygen, dissolved [DO]MO MIN report only all year
D026pHMO MIN >= 6 SU all year
D026pHMO MAX <= 9 SU all year
D026Solids, total suspendedMO AVG <= 30 mg/L all year
D026Solids, total suspendedMO MAX report only Jul
D026Solids, total suspendedMX WK AV <= 45 mg/L all year
D026Solids, total suspendedMO AVG <= 51 kg/d all year
D026Solids, total suspendedMX WK AV <= 77 kg/d all year
D026Nitrogen, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
D026Nitrogen, ammonia total [as N]MO AVG <= 1.3 mL/L Jun, Jul, Aug, Sep
D026Nitrogen, ammonia total [as N]MO AVG <= 9.2 mg/L Oct, Nov
D026Nitrogen, ammonia total [as N]MO AVG <= 9.4 mg/L Apr, May
D026Nitrogen, ammonia total [as N]MO AVG <= 15.6 mg/L Jan, Feb, Mar, Dec
D026Nitrogen, ammonia total [as N]MO AVG <= 2.2 kg/d Jun, Jul, Aug, Sep
D026Nitrogen, ammonia total [as N]MO AVG <= 15.7 kg/d Oct, Nov
D026Nitrogen, ammonia total [as N]MO AVG <= 16.1 kg/d Apr, May
D026Nitrogen, ammonia total [as N]MO AVG <= 26.6 kg/d Jan, Feb, Mar, Dec
D026Nitrogen, Kjeldahl, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
D026Nitrite + Nitrate total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
D026Phosphorus, total [as P]1D <= 1 mg/L all year
D026Phosphorus, total [as P]MO AVG report only all year
D026Phosphorus, total [as P]MO AVG report only all year
D026Phosphorus, total [as P]ANNL TOT <= 419 kg/yr all year
D026Chloride [as Cl]MO MAX report only Mar, Sep
D026Sulfate, total [as SO4]MO MAX report only all year
D026Coliform, fecal MPN + membrane ftl 44.5 CMO GEOMN <= 200 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
D026Flow, in conduit or thru treatment plantMO AVG report only all year
D026Flow, in conduit or thru treatment plantMO MAX report only all year
D026Flow, in conduit or thru treatment plantMO TOTAL report only all year
D026Solids, total dissolvedMO MAX report only Mar, Sep
D026Mercury, dissolved [as Hg]MO MAX report only Jul
D026Mercury, total [as Hg]MO MAX report only Jul
D026BOD, carbonaceous [5 day, 20 C]MO AVG <= 15 mg/L all year
D026BOD, carbonaceous [5 day, 20 C]MX WK AV <= 25 mg/L all year
D026BOD, carbonaceous [5 day, 20 C]MO AVG <= 26 kg/d all year
D026BOD, carbonaceous [5 day, 20 C]MX WK AV <= 43 kg/d all year
D026BOD, carb-5 day, 20 deg C, percent removalMO AV MN >= 85 % all year
D026Solids, suspended percent removalMO AV MN >= 85 % all year
S027Precipitation, total defined period/inMO TOTAL report only all year
S027pHMO MIN report only all year
S027pHMO MAX report only all year
S027Solids, total suspendedMO AVG report only all year
S027Solids, total suspendedMO MAX report only all year
S027Nitrogen, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
S027Nitrogen, Kjeldahl, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
S027Nitrite + Nitrate total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
S027Phosphorus, total [as P]MO AVG report only all year
S027Sulfate, total [as SO4]MO MAX report only all year
S027Flow, in conduit or thru treatment plantMO AVG report only all year
S027Flow, in conduit or thru treatment plantMO MAX report only all year
S027Flow, in conduit or thru treatment plantMO TOTAL report only all year
S027BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
S027BOD, carbonaceous [5 day, 20 C]MO MAX report only all year
W030Sulfate, total [as SO4]MO MAX report only all year
W031Sulfate, total [as SO4]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