Litchfield city of

NPDES permit MN0023973 · Major POTW · effective, expires 2030-12-31 · 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

5values over a limit
0required values missing, on 0 form(s)
0of 33 forms filed late

Last period with anything received: 2026-07-31. Most often over: Phosphorus, total [as P] (2), BOD, carbonaceous [5 day, 20 C] (1), Nitrogen, ammonia total [as N] (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
D074Specific conductanceMO MAX report only all year
D074Oxygen, dissolved [DO]MO MIN >= 5 mg/L all year
D074pHMO MIN >= 6 SU all year
D074pHMO MAX <= 9 SU all year
D074Solids, total suspendedMO AVG <= 30 mg/L all year
D074Solids, total suspendedMX WK AV <= 45 mg/L all year
D074Solids, total suspendedMO MAX report only Jan, Mar, May, Jul, Sep, Nov
D074Solids, total suspendedMO AVG <= 215 kg/d all year
D074Solids, total suspendedMX WK AV <= 323 kg/d all year
D074Nitrogen, total [as N]MO AVG report only all year
D074Nitrogen, ammonia total [as N]MO AVG <= 13.6 mg/L Jan, Feb, Mar, Dec
D074Nitrogen, ammonia total [as N]MO AVG <= 8.6 mg/L Apr, May
D074Nitrogen, ammonia total [as N]MO AVG <= 5.8 mg/L Oct, Nov
D074Nitrogen, ammonia total [as N]MO AVG <= 2.1 mg/L Jun, Jul, Aug, Sep
D074Nitrogen, ammonia total [as N]MO AVG <= 159.3 kg/d Jan, Feb, Mar, Dec
D074Nitrogen, ammonia total [as N]MO AVG <= 100.7 kg/d Apr, May
D074Nitrogen, ammonia total [as N]MO AVG <= 67.9 kg/d Oct, Nov
D074Nitrogen, ammonia total [as N]MO AVG <= 24.6 kg/d Jun, Jul, Aug, Sep
D074Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
D074Nitrite + Nitrate total [as N]MO AVG report only all year
D074Phosphorus, total [as P]MO AVG <= 1 mg/L all year
D074Phosphorus, total [as P]MO AVG report only all year
D074Phosphorus, total [as P]ANNL TOT <= 2619 kg/yr all year
D074Chloride [as Cl]DAILY MX <= 349 mg/L all year
D074Sulfate, total [as SO4]MO AVG report only all year
D074Copper, total [as Cu]MO AVG <= 22 ug/L all year
D074Copper, total [as Cu]DAILY MX <= 38 ug/L all year
D074Lead, total [as Pb]MO MAX report only May, Sep
D074Silver, total [as Ag]MO AVG <= .95 ug/L all year
D074Silver, total [as Ag]DAILY MX <= 1.65 ug/L all year
D074Selenium, total [as Se]MO AVG <= 4.75 ug/L all year
D074Selenium, total [as Se]DAILY MX <= 8.23 ug/L all year
D074Coliform, fecal MPN + membrane ftl 44.5 CMO GEOMN <= 200 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
D074Flow, in conduit or thru treatment plantMO AVG report only all year
D074Flow, in conduit or thru treatment plantMO MAX report only all year
D074Flow, in conduit or thru treatment plantMO TOTAL report only all year
D074Chlorine, total residualDAILY MX <= .038 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
D074Solids, total dissolvedMO AVG report only all year
D074Mercury, dissolved [as Hg]MO AVG report only Jan, Mar, May, Jul, Sep, Nov
D074Mercury, dissolved [as Hg]DAILY MX report only Jan, Mar, May, Jul, Sep, Nov
D074Mercury, total [as Hg]MO AVG <= 9.7 ng/L Jan, Mar, May, Jul, Sep, Nov
D074Mercury, total [as Hg]DAILY MX <= 16.8 ng/L Jan, Mar, May, Jul, Sep, Nov
D074BOD, carbonaceous [5 day, 20 C]MO AVG <= 5 mg/L all year
D074BOD, carbonaceous [5 day, 20 C]MX WK AV <= 7.5 mg/L all year
D074BOD, carbonaceous [5 day, 20 C]MO AVG <= 58.6 kg/d all year
D074BOD, carbonaceous [5 day, 20 C]MX WK AV <= 88 kg/d all year
D074BOD, carb-5 day, 20 deg C, percent removalMO AV MN >= 85 % all year
D074Solids, suspended percent removalMO AV MN >= 85 % all year
S083Precipitation, total defined period/inMO TOTAL report only all year
S083pHMO MIN report only all year
S083pHMO MAX report only all year
S083Solids, total suspendedMO AVG report only all year
S083Solids, total suspendedMO MAX report only all year
S083Nitrogen, total [as N]MO AVG report only all year
S083Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
S083Nitrite + Nitrate total [as N]MO AVG report only all year
S083Phosphorus, total [as P]MO AVG report only all year
S083Flow, in conduit or thru treatment plantMO AVG report only all year
S083Flow, in conduit or thru treatment plantMO MAX report only all year
S083Flow, in conduit or thru treatment plantMO TOTAL report only all year
S083Mercury, total [as Hg]MO AVG report only Jan, Mar, May, Jul, Sep, Nov
S083BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
S083BOD, 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