Mankato city of

NPDES permit MN0030171 · Major POTW · expired, expires 2026-05-31 · 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 2026-05-31 and is expired: 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

2values over a limit
0required values missing, on 0 form(s)
0of 48 forms filed late

Last period with anything received: 2026-07-31. Most often over: Phosphorus, total [as P] (1), pH (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 (63)

OutfallParameterStatisticLimitMonths
D133Oxygen, dissolved [DO]MO MIN report only Apr, May
D133Oxygen, dissolved [DO]MO MIN >= 5 mg/L Jan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, Dec
D133pHMO MIN >= 6 SU all year
D133pHMO MAX <= 9 SU all year
D133Solids, total suspendedMO AVG <= 30 mg/L all year
D133Solids, total suspendedMO MAX report only May, Sep
D133Solids, total suspendedMX WK AV <= 45 mg/L all year
D133Solids, total suspendedMO AVG <= 1277 kg/d all year
D133Solids, total suspendedMX WK AV <= 1916 kg/d all year
D133Nitrogen, total [as N]MO AVG report only all year
D133Nitrogen, ammonia total [as N]MO AVG <= 62.1 mg/L Jan, Feb, Mar, Dec
D133Nitrogen, ammonia total [as N]MO AVG <= 20.5 mg/L Oct, Nov
D133Nitrogen, ammonia total [as N]MO AVG <= 5.6 mg/L Jun, Jul, Aug, Sep
D133Nitrogen, ammonia total [as N]MO AVG <= 62.7 mg/L Apr, May
D133Nitrogen, ammonia total [as N]MO AVG <= 2640 kg/d Jan, Feb, Mar, Dec
D133Nitrogen, ammonia total [as N]MO AVG <= 872 kg/d Oct, Nov
D133Nitrogen, ammonia total [as N]MO AVG <= 238 kg/d Jun, Jul, Aug, Sep
D133Nitrogen, ammonia total [as N]MO AVG <= 2670 kg/d Apr, May
D133Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
D133Nitrite + Nitrate total [as N]MO AVG report only all year
D133Phosphorus, total [as P]MO AVG report only all year
D133Phosphorus, total [as P]MO MAX <= 1 Ratio all year
D133Phosphorus, total [as P]1D report only all year
D133Phosphorus, total [as P]MO AVG <= 33.2 kg/d Jun, Jul, Aug, Sep
D133Phosphorus, total [as P]YA <= 12243 kg/yr all year
D133Cyanide, total [as CN]MO MAX report only all year
D133Beryllium, total [as Be]MO MAX report only all year
D133Cadmium, total [as Cd]MO MAX report only all year
D133Chromium, total [as Cr]MO MAX report only all year
D133Silver, total [as Ag]MO MAX report only all year
D133Selenium, total [as Se]MO MAX report only all year
D133Coliform, fecal MPN + membrane ftl 44.5 CMO GEOMN <= 200 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
D133Flow, in conduit or thru treatment plantMO AVG report only all year
D133Flow, in conduit or thru treatment plantMO MAX report only all year
D133Flow, in conduit or thru treatment plantMO TOTAL report only all year
D133Chlorine, total residualDAILY MX <= .038 mg/L all year
D133Solids, total dissolvedMO AVG report only Mar, Sep
D133Mercury, dissolved [as Hg]MO MAX report only May, Sep
D133Mercury, total [as Hg]MO MAX report only May, Sep
D133BOD, carbonaceous [5 day, 20 C]MO AVG <= 22 mg/L Jan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, Dec
D133BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L Apr, May
D133BOD, carbonaceous [5 day, 20 C]MX WK AV <= 33 mg/L Jan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, Dec
D133BOD, carbonaceous [5 day, 20 C]MX WK AV <= 40 mg/L Apr, May
D133BOD, carbonaceous [5 day, 20 C]MO AVG <= 936 kg/d Jan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, Dec
D133BOD, carbonaceous [5 day, 20 C]MO AVG <= 1064 kg/d Apr, May
D133BOD, carbonaceous [5 day, 20 C]MX WK AV <= 1404 kg/d Jan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, Dec
D133BOD, carbonaceous [5 day, 20 C]MX WK AV <= 1596 kg/d Apr, May
D133BOD, carb-5 day, 20 deg C, percent removalMO AV MN >= 85 % all year
D133Solids, suspended percent removalMO AV MN >= 85 % all year
S138Precipitation, total defined period/inMO TOTAL report only all year
S138pHMO MIN report only all year
S138pHMO MAX report only all year
S138Solids, total suspendedMO AVG report only all year
S138Solids, total suspendedMO MAX report only all year
S138Nitrogen, total [as N]MO AVG report only all year
S138Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
S138Nitrite + Nitrate total [as N]MO AVG report only all year
S138Phosphorus, total [as P]MO AVG report only all year
S138Flow, in conduit or thru treatment plantMO AVG report only all year
S138Flow, in conduit or thru treatment plantMO MAX report only all year
S138Flow, in conduit or thru treatment plantMO TOTAL report only all year
S138BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
S138BOD, 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