Marshall city of

NPDES permit MN0022179 · Major POTW · effective, expires 2029-02-28 · EPA's file as of 2026-09-19

Check this month's numbers before you file

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

2values over a limit
0required values missing, on 0 form(s)
0of 65 forms filed late

Last period with anything received: 2026-07-31. Most often over: pH (2).

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 (89)

OutfallParameterStatisticLimitMonths
D160Specific conductanceMO MAX report only all year
D160Oxygen, dissolved [DO]MO MIN >= 7.5 mg/L all year
D160Oxygen, dissolved [DO]MO MIN report only all year
D160pHMO MIN >= 6 SU all year
D160pHMO MAX <= 9 SU all year
D160Bicarbonate ion- [as HCO3]MO MAX report only all year
D160Solids, total suspendedMO AVG <= 30 mg/L all year
D160Solids, total suspendedMO MAX report only May, Sep
D160Solids, total suspendedMX WK AV <= 45 mg/L all year
D160Solids, total suspendedMO AVG <= 510 kg/d all year
D160Solids, total suspendedMX WK AV <= 765 kg/d all year
D160Nitrogen, total [as N]MO AVG report only all year
D160Nitrogen, ammonia total [as N]MO AVG report only all year
D160Nitrogen, ammonia total [as N]MO AVG <= 9.4 mg/L Jan, Feb, Mar, Dec
D160Nitrogen, ammonia total [as N]MO AVG <= 2.4 mg/L Apr, May
D160Nitrogen, ammonia total [as N]MO AVG <= 2.3 mg/L Oct, Nov
D160Nitrogen, ammonia total [as N]MO AVG <= 1.1 mg/L Jun, Jul, Aug, Sep
D160Nitrogen, ammonia total [as N]MO AVG report only all year
D160Nitrogen, ammonia total [as N]MO AVG <= 159.9 kg/d Jan, Feb, Mar, Dec
D160Nitrogen, ammonia total [as N]MO AVG <= 40.8 kg/d Apr, May
D160Nitrogen, ammonia total [as N]MO AVG <= 39.1 kg/d Oct, Nov
D160Nitrogen, ammonia total [as N]MO AVG <= 18.7 kg/d Jun, Jul, Aug, Sep
D160Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
D160Nitrite + Nitrate total [as N]MO AVG report only all year
D160Phosphorus, total [as P]MO AVG report only all year
D160Phosphorus, total [as P]MO AVG report only all year
D160Phosphorus, total [as P]ANNL TOT <= 4973 kg/yr all year
D160Calcium, total [as Ca]MO MAX report only all year
D160Magnesium, total [as Mg]MO MAX report only all year
D160Sodium, total [as Na]MO MAX report only all year
D160Potassium, total [as K]MO MAX report only all year
D160Chloride [as Cl]MO AVG <= 468 mg/L all year
D160Sulfate, total [as SO4]MO MAX report only all year
D160Copper, total [as Cu]MO AVG <= 26 mg/L Jan, Apr, Jul, Oct
D160Copper, total [as Cu]DAILY MX <= 42 mg/L Jan, Apr, Jul, Oct
D160Hardness, Ca Mg Calculated [mg/L as CaCO3]MO MAX report only all year
D160Coliform, fecal MPN + membrane ftl 44.5 CMO GEOMN <= 200 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
D160Flow, in conduit or thru treatment plantMO AVG report only all year
D160Flow, in conduit or thru treatment plantMO MAX report only all year
D160Flow, in conduit or thru treatment plantMO TOTAL report only all year
D160Solids, total dissolvedMO MAX report only all year
D160Mercury, dissolved [as Hg]MO MAX report only May, Sep
D160Mercury, total [as Hg]MO MAX report only May, Sep
D160BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L all year
D160BOD, carbonaceous [5 day, 20 C]MO AVG <= 5 mg/L all year
D160BOD, carbonaceous [5 day, 20 C]MX WK AV <= 40 mg/L all year
D160BOD, carbonaceous [5 day, 20 C]MX WK AV <= 10 mg/L all year
D160BOD, carbonaceous [5 day, 20 C]MO AVG <= 425 kg/d all year
D160BOD, carbonaceous [5 day, 20 C]MO AVG <= 85 kg/d all year
D160BOD, carbonaceous [5 day, 20 C]MX WK AV <= 680 kg/d all year
D160BOD, carbonaceous [5 day, 20 C]MX WK AV <= 170 kg/d all year
D160BOD, carb-5 day, 20 deg C, percent removalMO AV MN >= 85 % all year
D160Solids, suspended percent removalMO AV MN >= 85 % all year
S164Precipitation, total defined period/inMO TOTAL report only all year
S164pHMO MIN report only all year
S164pHMO MAX report only all year
S164Solids, total suspendedMO AVG report only all year
S164Solids, total suspendedMO MAX report only all year
S164Nitrogen, total [as N]MO AVG report only all year
S164Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
S164Nitrite + Nitrate total [as N]MO AVG report only all year
S164Phosphorus, total [as P]MO AVG report only all year
S164Flow, in conduit or thru treatment plantMO AVG report only all year
S164Flow, in conduit or thru treatment plantMO MAX report only all year
S164Flow, in conduit or thru treatment plantMO TOTAL report only all year
S164BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
S164BOD, carbonaceous [5 day, 20 C]MO MAX report only all year
W161Temperature, water deg. centigradeMO MAX report only Jan, Feb, Mar, Dec
W161Temperature, water deg. centigradeMO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
W161Oxygen, dissolved [DO]MO MIN report only Jan, Feb, Mar, Dec
W161Oxygen, dissolved [DO]MO MIN report only Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
W161pHMO MAX report only Jan, Feb, Mar, Dec
W161pHMO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
W161Nitrogen, ammonia total [as N]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
W161Nitrogen, ammonia total [as N]MO MAX report only Jan, Feb, Mar, Dec
W161Nitrogen, ammonia, tot unionized [as N]MO MAX report only Jan, Feb, Mar, Dec
W161Nitrogen, ammonia, tot unionized [as N]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
W161Effluent dilution ratioMO MIN report only Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
W161Effluent dilution ratioMO MIN report only Jan, Feb, Mar, Dec
W162Temperature, water deg. centigradeMO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
W162Oxygen, dissolved [DO]MO MIN report only Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
W162pHMO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
W162Nitrogen, ammonia total [as N]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
W162Nitrogen, ammonia, tot unionized [as N]MO MAX report only Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
W163Temperature, water deg. centigradeMO MAX report only Jan, Feb, Mar, Dec
W163Oxygen, dissolved [DO]MO MIN report only Jan, Feb, Mar, Dec
W163pHMO MAX report only Jan, Feb, Mar, Dec
W163Nitrogen, ammonia total [as N]MO MAX report only Jan, Feb, Mar, Dec
W163Nitrogen, ammonia, tot unionized [as N]MO MAX report only Jan, Feb, Mar, 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