Tri-City Wastewater Treatment Systems Board

NPDES permit MN0025224 · Minor POTW · effective, expires 2029-08-31 · 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
0required values missing, on 0 form(s)
0of 72 forms filed late

Last period with anything received: 2026-08-31. Most often over: pH (1), Solids, total suspended (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 (95)

OutfallParameterStatisticLimitMonths
D004Specific conductanceMO MAX report only all year
D004Oxygen, dissolved [DO]MO MIN report only all year
D004pHMO MIN >= 6 SU all year
D004pHMO MAX <= 9 SU all year
D004Bicarbonate ion- [as HCO3]MO MAX report only all year
D004Solids, total suspendedMO AVG report only all year
D004Solids, total suspendedMO AVG <= 45 mg/L all year
D004Solids, total suspendedMO MAX report only all year
D004Solids, total suspendedMX WK AV <= 65 mg/L all year
D004Solids, total suspendedMO AVG <= 715.3 kg/d all year
D004Solids, total suspendedMX WK AV <= 1033.3 kg/d all year
D004Nitrogen, total [as N]MO AVG report only all year
D004Nitrogen, ammonia total [as N]MO AVG report only all year
D004Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
D004Nitrite + Nitrate total [as N]MO AVG report only all year
D004Phosphorus, total [as P]MO AVG report only all year
D004Phosphorus, total [as P]MO AVG report only all year
D004Phosphorus, total [as P]MO TOTAL report only all year
D004Calcium, total [as Ca]MO MAX report only all year
D004Magnesium, total [as Mg]MO MAX report only all year
D004Sodium, total [as Na]MO MAX report only all year
D004Potassium, total [as K]MO MAX report only all year
D004Chloride [as Cl]MO AVG <= 476 mg/L all year
D004Sulfate, total [as SO4]MO MAX report only all year
D004Hardness, Ca Mg Calculated [mg/L as CaCO3]MO MAX report only all year
D004Coliform, fecal MPN + membrane ftl 44.5 CMO GEOMN <= 200 #/100mL May, Jun, Jul, Aug, Sep, Oct
D004Flow, in conduit or thru treatment plantMO AVG report only Jan, Feb, Jul, Aug
D004Flow, in conduit or thru treatment plantMO AVG report only Mar, Apr, May, Jun, Sep, Oct, Nov, Dec
D004Flow, in conduit or thru treatment plantMO MAX report only Jan, Feb, Jul, Aug
D004Flow, in conduit or thru treatment plantMO MAX report only Mar, Apr, May, Jun, Sep, Oct, Nov, Dec
D004Flow, in conduit or thru treatment plantMO TOTAL report only Jan, Feb, Jul, Aug
D004Flow, in conduit or thru treatment plantMO TOTAL report only Mar, Apr, May, Jun, Sep, Oct, Nov, Dec
D004Solids, total dissolvedMO MAX report only all year
D004Mercury, dissolved [as Hg]MO AVG report only all year
D004Mercury, dissolved [as Hg]DAILY MX report only all year
D004Mercury, total [as Hg]MO AVG report only all year
D004Mercury, total [as Hg]DAILY MX report only all year
D004BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L all year
D004BOD, carbonaceous [5 day, 20 C]MX WK AV <= 40 mg/L all year
D004BOD, carbonaceous [5 day, 20 C]MO AVG <= 397.4 kg/d all year
D004BOD, carbonaceous [5 day, 20 C]MX WK AV <= 635.9 kg/d all year
D005Specific conductanceMO MAX report only all year
D005Oxygen, dissolved [DO]MO MIN report only all year
D005pHMO MIN >= 6 SU all year
D005pHMO MAX <= 9 SU all year
D005Bicarbonate ion- [as HCO3]MO MAX report only all year
D005Solids, total suspendedMO AVG <= 45 mg/L all year
D005Solids, total suspendedMO AVG report only all year
D005Solids, total suspendedMX WK AV <= 65 mg/L all year
D005Solids, total suspendedDAILY MX report only all year
D005Solids, total suspendedMO AVG <= 1932.5 kg/d all year
D005Solids, total suspendedMX WK AV <= 2791.4 kg/d all year
D005Nitrogen, total [as N]MO AVG report only all year
D005Nitrogen, ammonia total [as N]MO AVG report only all year
D005Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
D005Nitrite + Nitrate total [as N]MO AVG report only all year
D005Phosphorus, total [as P]MO AVG report only all year
D005Phosphorus, total [as P]MO AVG report only all year
D005Phosphorus, total [as P]MO TOTAL report only all year
D005Calcium, total [as Ca]MO MAX report only all year
D005Magnesium, total [as Mg]MO MAX report only all year
D005Sodium, total [as Na]MO MAX report only all year
D005Potassium, total [as K]MO MAX report only all year
D005Chloride [as Cl]MO AVG <= 476 mg/L all year
D005Sulfate, total [as SO4]MO MAX report only all year
D005Hardness, Ca Mg Calculated [mg/L as CaCO3]MO MAX report only all year
D005Coliform, fecal MPN + membrane ftl 44.5 CMO GEOMN <= 200 #/100mL May, Jun, Jul, Aug, Sep, Oct
D005Flow, in conduit or thru treatment plantMO AVG report only Jan, Feb, Jul, Aug
D005Flow, in conduit or thru treatment plantMO AVG report only Mar, Apr, May, Jun, Sep, Oct, Nov, Dec
D005Flow, in conduit or thru treatment plantMO MAX report only Jan, Feb, Jul, Aug
D005Flow, in conduit or thru treatment plantMO MAX report only Mar, Apr, May, Jun, Sep, Oct, Nov, Dec
D005Flow, in conduit or thru treatment plantMO TOTAL report only Jan, Feb, Jul, Aug
D005Flow, in conduit or thru treatment plantMO TOTAL report only Mar, Apr, May, Jun, Sep, Oct, Nov, Dec
D005Solids, total dissolvedMO MAX report only all year
D005Mercury, dissolved [as Hg]MO AVG report only all year
D005Mercury, dissolved [as Hg]DAILY MX report only all year
D005Mercury, total [as Hg]MO AVG report only all year
D005Mercury, total [as Hg]MO MAX report only all year
D005BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L all year
D005BOD, carbonaceous [5 day, 20 C]MX WK AV <= 40 mg/L all year
D005BOD, carbonaceous [5 day, 20 C]MO AVG <= 1073.6 kg/d all year
D005BOD, carbonaceous [5 day, 20 C]MX WK AV <= 1717.8 kg/d all year
D007Phosphorus, total [as P]YA <= 1202 kg/yr all year
S006Precipitation, total defined period/inMO TOTAL report only all year
S006pHQB report only Mar, Jun, Sep, Dec
S006Solids, total suspendedQRTR AVG report only Mar, Jun, Sep, Dec
S006Nitrogen, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
S006Nitrogen, Kjeldahl, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
S006Nitrite + Nitrate total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
S006Phosphorus, total [as P]QRTR AVG report only Mar, Jun, Sep, Dec
S006Flow, in conduit or thru treatment plantMO AVG report only all year
S006Flow, in conduit or thru treatment plantMO MAX report only all year
S006Flow, in conduit or thru treatment plantMO TOTAL report only all year
S006Mercury, total [as Hg]MO AVG report only all year
S006BOD, carbonaceous [5 day, 20 C]QRTR AVG report only Mar, Jun, Sep, 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