OAKFIELD WASTEWATER TREATMENT

NPDES permit WI0024988 · Minor POTW · expired, expires 2022-09-30 · 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.

This permit expired on 2022-09-30 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
3required values missing, on 3 form(s)
18of 20 forms filed late

Last period with anything received: 2026-06-30. Most often over: BOD, 5-day, 20 deg. C (1), Phosphorus, total [as P] (1).

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 (41)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]DAILY MN report only all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 19 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CWKLY AVG <= 35 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, 20 deg. CMO AVG <= 19 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, 20 deg. CDAILY MX report only May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CDAILY MX report only Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, 20 deg. CMO AVG report only May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMO AVG report only Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, 20 deg. CWKLY AVG <= 48 lb/d May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CWKLY AVG <= 88 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001pHDAILY MN >= 6 SU all year
001pHDAILY MX <= 9 SU all year
001Nitrogen, ammonia total [as N]WKLY AVG <= 12 mg/L Oct
001Nitrogen, ammonia total [as N]WKLY AVG <= 20 mg/L Nov, Dec
001Nitrogen, ammonia total [as N]WKLY AVG <= 12 mg/L Jan, Feb, Mar
001Nitrogen, ammonia total [as N]WKLY AVG <= 8.6 mg/L Apr, May
001Nitrogen, ammonia total [as N]WKLY AVG <= 12 mg/L Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]MO AVG <= 9.4 mg/L Oct
001Nitrogen, ammonia total [as N]MO AVG <= 9.4 mg/L Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 5.7 mg/L Jan, Feb, Mar
001Nitrogen, ammonia total [as N]MO AVG <= 4 mg/L Apr, May
001Nitrogen, ammonia total [as N]MO AVG <= 6.2 mg/L Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]DAILY MX report only Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 24 mg/L Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 24 mg/L Jan, Feb, Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 24 mg/L Apr, May
001Nitrogen, ammonia total [as N]DAILY MX report only Jun, Jul, Aug, Sep
001Phosphorus, total [as P]MO AVG <= 3.63 mg/L all year
001Chloride [as Cl]DAILY 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 <= 14 ug/L May, Jun, Jul, Aug, Sep
001Chlorine, total residualMO AVG <= 14 ug/L May, Jun, Jul, Aug, Sep
001Chlorine, total residualDAILY MX <= 38 ug/L May, Jun, Jul, Aug, Sep
001Coliform, fecal generalWK GEOMN <= 656 #/100mL May, Jun, Jul, Aug, Sep
001Coliform, fecal generalGEO MEAN <= 400 #/100mL May, Jun, Jul, Aug, Sep
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

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