City of Oshkosh

NPDES permit WI0025038 · Major POTW · expired, expires 2023-12-31 · EPA's file as of 2026-09-19

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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 2023-12-31 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

10values over a limit
41required values missing, on 20 form(s)
12of 38 forms filed late

Last period with anything received: 2026-06-30. Most often over: Phosphorus, total [as P] (10).

Reporting

Reports are due about 15 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (53)

OutfallParameterStatisticLimitMonths
001pHDAILY MN >= 6 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspendedWKLY AVG <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedDAILY MX report only all year
001Nitrogen, ammonia total [as N]WKLY AVG <= 92 mg/L Jan, Feb, Mar
001Nitrogen, ammonia total [as N]WKLY AVG <= 35 mg/L Apr, May
001Nitrogen, ammonia total [as N]WKLY AVG <= 67 mg/L Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 38 mg/L Jan, Feb, Mar
001Nitrogen, ammonia total [as N]MO AVG <= 23 mg/L Apr, May
001Nitrogen, ammonia total [as N]MO AVG report only Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 39 mg/L Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX report only Jun, Jul, Aug, Sep, Oct
001Phosphorus, total [as P]MO AVG <= .12 mg/L all year
001Phosphorus, total [as P]DAILY MX report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]DAILY MX report only all year
001Nickel, total recoverableDAILY MX report only all year
001Zinc, total recoverableDAILY MX report only all year
001Cadmium, total recoverableDAILY MX report only all year
001Lead, total recoverableDAILY MX report only all year
001Chromium, total recoverableDAILY MX report only all year
001Copper, total recoverableDAILY MX report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualWKLY AVG <= 38 ug/L all year
001Chlorine, total residualMO AVG <= 38 ug/L all year
001Chlorine, total residualDAILY MX <= 38 ug/L all year
001Mercury, total recoverableDAILY MX <= 3.6 ng/L all year
001Mercury, total recoverableDAILY MX <= 3.6 ng/L all year
001Coliform, fecal generalWK GEOMN <= 656 #/100mL all year
001Coliform, fecal generalGEO MEAN <= 400 #/100mL all year
001BOD, carbonaceous [5 day, 5 C]WKLY AVG <= 40 mg/L all year
001BOD, carbonaceous [5 day, 5 C]MO AVG <= 25 mg/L all year
001BOD, carbonaceous [5 day, 5 C]DAILY MX report only all year
003Flow, in conduit or thru treatment plantMO AVG report only all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
701BOD, 5-day, 20 deg. CMO AVG report only all year
701BOD, 5-day, 20 deg. CDAILY MX report only all year
701Solids, total suspendedMO AVG report only all year
701Solids, total suspendedDAILY MX report only all year
701Nickel, total recoverableDAILY MX report only all year
701Zinc, total recoverableDAILY MX report only all year
701Cadmium, total recoverableDAILY MX report only all year
701Lead, total recoverableDAILY MX report only all year
701Chromium, total recoverableDAILY MX report only all year
701Copper, total recoverableDAILY MX report only all year
701Flow, in conduit or thru treatment plantMO AVG report only all year
701Flow, in conduit or thru treatment plantDAILY MX report only all year
701Mercury, total recoverableDAILY MX report only all year
701Mercury, total recoverableQB report only all year
701BOD, carbonaceous [5 day, 5 C]MO AVG report only all year
701BOD, carbonaceous [5 day, 5 C]DAILY MX 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