Western Lake Superior Sanitary District (WLSSD)

NPDES permit MN0049786 · Major POTW · effective, expires 2028-04-30 · 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

5values over a limit
0required values missing, on 0 form(s)
0of 49 forms filed late

Last period with anything received: 2026-07-31. Most often over: Polychlorinated biphenyls [PCBs] (2), 2,3,7,8-Tetrachlorodibenzo-p-dioxin (2), Mercury, total [as Hg] (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 (77)

OutfallParameterStatisticLimitMonths
D665Temperature, water deg. centigradeMO MIN report only all year
D665Temperature, water deg. centigradeMO MAX report only all year
D665Oxygen, dissolved [DO]MO MIN report only all year
D665pHMO MIN >= 6 SU all year
D665pHMO MAX <= 9 SU all year
D665Solids, total suspendedMO AVG report only all year
D665Solids, total suspendedMO AVG <= 30 mg/L all year
D665Solids, total suspendedDAILY MX report only all year
D665Solids, total suspendedMX WK AV <= 45 mg/L all year
D665Solids, total suspendedMO AVG <= 5500 kg/d all year
D665Solids, total suspendedMX WK AV <= 8233 kg/d all year
D665Nitrogen, total [as N]MO AVG report only all year
D665Nitrogen, ammonia total [as N]MO AVG report only all year
D665Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
D665Nitrite + Nitrate total [as N]MO AVG report only all year
D665Phosphorus, total [as P]MO AVG <= 1 mg/L all year
D665Phosphorus, total [as P]MO AVG <= 115 kg/d all year
D665Chloride [as Cl]QB report only Mar, Jun, Sep, Dec
D665Sulfate, total [as SO4]MO AVG report only all year
D665Copper, total [as Cu]QB report only Mar, Jun, Sep, Dec
D665Halogens, adsorbable organicQB report only Mar, Jun, Sep, Dec
D665E. coli, MTEC-MFMO GEOMN <= 126 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
D6652,3,7,8-Tetrachlorodibenzo-p-dioxinQRTR AVG <= .0043 pg/L Mar, Jun, Sep, Dec
D6652,3,7,8-Tetrachlorodibenzo-p-dioxinQB <= .0075 pg/L Mar, Jun, Sep, Dec
D6652,3,7,8-Tetrachlorodibenzo-p-dioxinQRTR AVG <= .0008 mg/d Mar, Jun, Sep, Dec
D6652,3,7,8-Tetrachlorodibenzo-p-dioxinQB <= .0014 mg/d Mar, Jun, Sep, Dec
D6654,4'-DDTMO MAX report only Mar, Sep
D665DieldrinMO MAX report only Mar, Sep
D665ToxapheneMO MAX report only Mar, Sep
D665HeptachlorMO MAX report only Mar, Sep
D665Polychlorinated biphenyls [PCBs]QRTR AVG <= .035 ng/L Mar, Jun, Sep, Dec
D665Polychlorinated biphenyls [PCBs]QB <= .061 ng/L Mar, Jun, Sep, Dec
D665Polychlorinated biphenyls [PCBs]QRTR AVG <= 6.41 mg/d Mar, Jun, Sep, Dec
D665Polychlorinated biphenyls [PCBs]QB <= 11.17 mg/d Mar, Jun, Sep, Dec
D665Coliform, fecal MPN + membrane ftl 44.5 CMO GEOMN report only Jan, Feb, Mar, Nov, Dec
D665Coliform, fecal MPN + membrane ftl 44.5 CMO GEOMN <= 200 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
D665Flow, in conduit or thru treatment plantMO AVG report only all year
D665Flow, in conduit or thru treatment plantMO MAX report only all year
D665Flow, in conduit or thru treatment plantMO TOTAL report only all year
D665Chlorine, total residualDAILY MX <= .038 mg/L all year
D665Solids, total dissolvedMO AVG report only Mar, Sep
D665Mercury, dissolved [as Hg]MO AVG report only all year
D665Mercury, dissolved [as Hg]DAILY MX report only all year
D665Mercury, total [as Hg]MO AVG <= 5.2 ng/L all year
D665Mercury, total [as Hg]DAILY MX <= 6.5 ng/L all year
D665Mercury, total [as Hg]MO AVG <= 953 mg/d all year
D665Mercury, total [as Hg]DAILY MX <= 1191 mg/d all year
D665BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L all year
D665BOD, carbonaceous [5 day, 20 C]MX WK AV <= 40 mg/L all year
D665BOD, carbonaceous [5 day, 20 C]MO AVG <= 4580 kg/d all year
D665BOD, carbonaceous [5 day, 20 C]MX WK AV <= 7318 kg/d all year
D665BOD, carb-5 day, 20 deg C, percent removalMO AV MN >= 85 % all year
D665Solids, suspended percent removalMO AV MN >= 85 % all year
S670Temperature, water deg. centigradeINST MIN report only all year
S670Temperature, water deg. centigradeINST MAX report only all year
S670Precipitation, total defined period/inMO TOTAL report only all year
S670pHMO MIN report only all year
S670pHMO MAX report only all year
S670Solids, total suspendedMO AVG report only Jan, Mar, May, Jul, Sep, Nov
S670Solids, total suspendedMO AVG report only all year
S670Solids, total suspendedMO MAX report only all year
S670Nitrogen, total [as N]MO AVG report only all year
S670Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
S670Nitrite + Nitrate total [as N]MO AVG report only all year
S670Phosphorus, total [as P]MO AVG report only all year
S670Halogens, adsorbable organicQB report only Mar, Jun, Sep, Dec
S6702,3,7,8-Tetrachlorodibenzo-p-dioxinQB report only Mar, Jun, Sep, Dec
S670Polychlorinated biphenyls [PCBs]QB report only Mar, Jun, Sep, Dec
S670Flow, in conduit or thru treatment plantMO AVG report only all year
S670Flow, in conduit or thru treatment plantMO MAX report only all year
S670Flow, in conduit or thru treatment plantMO TOTAL report only all year
S670Mercury, dissolved [as Hg]MO AVG report only Jan, Mar, May, Jul, Sep, Nov
S670Mercury, total [as Hg]MO AVG report only Jan, Mar, May, Jul, Sep, Nov
S670BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
S670BOD, carbonaceous [5 day, 20 C]MO MAX report only all year
W667Coliform, fecal MPN + membrane ftl 44.5 CINST MAX report only Jan, Feb, Mar, Nov, Dec
W669Coliform, fecal MPN + membrane ftl 44.5 CINST MAX report only Jan, Feb, Mar, Nov, 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