Lake Crystal city of

NPDES permit MN0055981 · Minor POTW · effective, expires 2029-03-31 · 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

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

Last period with anything received: 2026-07-31.

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 (45)

OutfallParameterStatisticLimitMonths
D017Specific conductanceMO MAX report only all year
D017Oxygen, dissolved [DO]MO MIN report only all year
D017pHMO MIN >= 6 SU all year
D017pHMO MAX <= 9 SU all year
D017Solids, total suspendedMO AVG <= 30 mg/L all year
D017Solids, total suspendedMO MAX report only Jul
D017Solids, total suspendedMX WK AV <= 45 mg/L all year
D017Solids, total suspendedMO AVG <= 66.9 kg/d all year
D017Solids, total suspendedMX WK AV <= 100.4 kg/d all year
D017Nitrogen, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
D017Nitrogen, ammonia total [as N]MO AVG report only Mar, Sep
D017Nitrogen, Kjeldahl, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
D017Nitrite + Nitrate total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
D017Phosphorus, total [as P]MO AVG <= 1 mg/L Jun, Jul, Aug, Sep
D017Phosphorus, total [as P]MO AVG <= 1 mg/L Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
D017Phosphorus, total [as P]MO AVG <= 3 kg/d Jun, Jul, Aug, Sep
D017Phosphorus, total [as P]MO AVG report only Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
D017Phosphorus, total [as P]ANNL TOT <= 815 kg/yr all year
D017Chloride [as Cl]MO MAX report only all year
D017Sulfate, total [as SO4]MO MAX report only all year
D017Coliform, fecal MPN + membrane ftl 44.5 CMO GEOMN <= 200 #/100mL May, Jun, Jul, Aug, Sep, Oct
D017Flow, in conduit or thru treatment plantMO AVG report only all year
D017Flow, in conduit or thru treatment plantMO MAX report only all year
D017Flow, in conduit or thru treatment plantMO TOTAL report only all year
D017Chlorine, total residualDAILY MX <= .038 mg/L May, Jun, Jul, Aug, Sep, Oct
D017Solids, total dissolvedMO MAX report only all year
D017Mercury, dissolved [as Hg]MO MAX report only Jul
D017Mercury, total [as Hg]MO MAX report only Jul
D017BOD, carbonaceous [5 day, 20 C]MO AVG <= 15 mg/L all year
D017BOD, carbonaceous [5 day, 20 C]MX WK AV <= 25 mg/L all year
D017BOD, carbonaceous [5 day, 20 C]MO AVG <= 55.8 kg/d all year
D017BOD, carbonaceous [5 day, 20 C]MX WK AV <= 33.5 kg/d all year
D017BOD, carb-5 day, 20 deg C, percent removalMO AV MN >= 85 % all year
D017Solids, suspended percent removalMO AV MN >= 85 % all year
S018Precipitation, total defined period/inMO TOTAL report only all year
S018pHMO MIN report only all year
S018pHMO MAX report only all year
S018Solids, total suspendedMO AVG report only all year
S018Solids, total suspendedMO MAX report only all year
S018Nitrogen, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
S018Nitrogen, Kjeldahl, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
S018Nitrite + Nitrate total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
S018Phosphorus, total [as P]MO AVG report only all year
S018BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
S018BOD, 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