Preston city of

NPDES permit MN0020745 · Minor POTW · effective, expires 2027-07-31 · 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 24 forms filed late

Last period with anything received: 2026-07-31. Most often over: Chlorine, total residual (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 (55)

OutfallParameterStatisticLimitMonths
D015Specific conductanceMO MAX report only Mar, Sep
D015Oxygen, dissolved [DO]MO MIN report only all year
D015pHMO MIN >= 6 SU all year
D015pHMO MAX <= 9 SU all year
D015Bicarbonate ion- [as HCO3]MO MAX report only Mar, Sep
D015Solids, total suspendedMO AVG report only May, Sep
D015Solids, total suspendedMO AVG <= 30 mg/L all year
D015Solids, total suspendedDAILY MX report only May, Sep
D015Solids, total suspendedMX WK AV <= 45 mg/L all year
D015Solids, total suspendedMO AVG <= 44 kg/d all year
D015Solids, total suspendedMX WK AV <= 67 kg/d all year
D015Nitrogen, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
D015Nitrogen, ammonia total [as N]MO AVG report only Mar, Sep
D015Nitrogen, Kjeldahl, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
D015Nitrite + Nitrate total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
D015Phosphorus, total [as P]MO AVG report only all year
D015Phosphorus, total [as P]MO AVG report only all year
D015Calcium, total [as Ca]MO MAX report only Mar, Sep
D015Magnesium, total [as Mg]MO MAX report only Mar, Sep
D015Sodium, total [as Na]MO MAX report only Mar, Sep
D015Potassium, total [as K]MO MAX report only Mar, Sep
D015Chloride [as Cl]MO MAX report only Mar, Sep
D015Sulfate, total [as SO4]MO MAX report only Mar, Sep
D015Hardness, Ca Mg Calculated [mg/L as CaCO3]MO MAX report only Mar, Sep
D015Coliform, fecal MPN + membrane ftl 44.5 CMO GEOMN <= 200 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
D015Flow, in conduit or thru treatment plantMO AVG report only all year
D015Flow, in conduit or thru treatment plantMO MAX report only all year
D015Flow, in conduit or thru treatment plantMO TOTAL report only all year
D015Chlorine, total residualDAILY MX <= .038 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
D015Solids, total dissolvedMO MAX report only Mar, Sep
D015Mercury, dissolved [as Hg]MO AVG report only May, Sep
D015Mercury, dissolved [as Hg]DAILY MX report only May, Sep
D015Mercury, total [as Hg]MO AVG <= 9.7 ng/L May, Sep
D015Mercury, total [as Hg]DAILY MX <= 16.8 ng/L May, Sep
D015BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L all year
D015BOD, carbonaceous [5 day, 20 C]MX WK AV <= 40 mg/L all year
D015BOD, carbonaceous [5 day, 20 C]MO AVG <= 37 kg/d all year
D015BOD, carbonaceous [5 day, 20 C]MX WK AV <= 59 kg/d all year
D015BOD, carb-5 day, 20 deg C, percent removalMO AV MN >= 85 % all year
D015Solids, suspended percent removalMO AV MN >= 85 % all year
S017Precipitation, total defined period/inMO TOTAL report only all year
S017pHMO MIN report only all year
S017pHMO MAX report only all year
S017Solids, total suspendedMO AVG report only all year
S017Solids, total suspendedMO MAX report only all year
S017Nitrogen, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
S017Nitrogen, Kjeldahl, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
S017Nitrite + Nitrate total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
S017Phosphorus, total [as P]MO AVG report only all year
S017Flow, in conduit or thru treatment plantMO AVG report only all year
S017Flow, in conduit or thru treatment plantMO MAX report only all year
S017Flow, in conduit or thru treatment plantMO TOTAL report only all year
S017Mercury, total [as Hg]MO AVG report only May, Sep
S017BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
S017BOD, 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