Mountain Lake city of

NPDES permit MN0021466 · Minor POTW · expired, expires 2023-08-31 · 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.

This permit expired on 2023-08-31 and is expired: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

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

2values over a limit
11required values missing, on 2 form(s)
1of 44 forms filed late

Last period with anything received: 2026-07-31. Most often over: pH (1), Phosphorus, total [as P] (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 (53)

OutfallParameterStatisticLimitMonths
D001Specific conductanceMO MAX report only all year
D001Oxygen, dissolved [DO]MO MIN report only all year
D001pHMO MIN >= 6 SU all year
D001pHMO MAX <= 9 SU all year
D001Bicarbonate ion- [as HCO3]MO MAX report only all year
D001Solids, total suspendedMO AVG report only all year
D001Solids, total suspendedMO AVG <= 45 mg/L all year
D001Solids, total suspendedDAILY MX report only all year
D001Solids, total suspendedMX WK AV <= 65 mg/L all year
D001Solids, total suspendedMO AVG <= 701 kg/d all year
D001Solids, total suspendedMX WK AV <= 1012.6 kg/d all year
D001Nitrogen, total [as N]MO AVG report only all year
D001Nitrogen, ammonia total [as N]MO AVG report only all year
D001Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
D001Nitrite + Nitrate total [as N]MO AVG report only all year
D001Phosphorus, total [as P]MO AVG report only all year
D001Phosphorus, total [as P]MO AVG report only all year
D001Phosphorus, total [as P]YA <= 655 kg/yr all year
D001Calcium, total [as Ca]MO MAX report only all year
D001Magnesium, total [as Mg]MO MAX report only all year
D001Sodium, total [as Na]MO MAX report only all year
D001Potassium, total [as K]MO MAX report only all year
D001Chloride [as Cl]MO MAX report only all year
D001Sulfate, total [as SO4]MO MAX report only all year
D001Hardness, Ca Mg Calculated [mg/L as CaCO3]MO MAX report only all year
D001Coliform, fecal MPN + membrane ftl 44.5 CMO GEOMN <= 200 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
D001Flow, in conduit or thru treatment plantMO AVG report only Mar, Apr, May, Oct, Nov, Dec
D001Flow, in conduit or thru treatment plantMO AVG report only Jan, Feb, Jun, Jul, Aug, Sep
D001Flow, in conduit or thru treatment plantMO MAX report only Mar, Apr, May, Oct, Nov, Dec
D001Flow, in conduit or thru treatment plantMO MAX report only Jan, Feb, Jun, Jul, Aug, Sep
D001Flow, in conduit or thru treatment plantMO TOTAL report only Mar, Apr, May, Oct, Nov, Dec
D001Flow, in conduit or thru treatment plantMO TOTAL report only Jan, Feb, Jun, Jul, Aug, Sep
D001Solids, total dissolvedMO MAX report only all year
D001Mercury, dissolved [as Hg]MO AVG report only all year
D001Mercury, dissolved [as Hg]DAILY MX report only all year
D001Mercury, total [as Hg]MO AVG <= 10 ng/L all year
D001Mercury, total [as Hg]DAILY MX <= 17 ng/L all year
D001BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L all year
D001BOD, carbonaceous [5 day, 20 C]MX WK AV <= 40 mg/L all year
D001BOD, carbonaceous [5 day, 20 C]MO AVG <= 389.5 kg/d all year
D001BOD, carbonaceous [5 day, 20 C]MX WK AV <= 623.2 kg/d all year
S002Precipitation, total defined period/inMO TOTAL report only all year
S002pHQB report only Mar, Jun, Sep, Dec
S002Solids, total suspendedQRTR AVG report only Mar, Jun, Sep, Dec
S002Nitrogen, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
S002Nitrogen, Kjeldahl, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
S002Nitrite + Nitrate total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
S002Phosphorus, total [as P]QRTR AVG report only Mar, Jun, Sep, Dec
S002Flow, in conduit or thru treatment plantMO AVG report only all year
S002Flow, in conduit or thru treatment plantMO MAX report only all year
S002Flow, in conduit or thru treatment plantMO TOTAL report only all year
S002Mercury, total [as Hg]MO AVG report only all year
S002BOD, 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