COLUMBUS WASTEWATER TREATMENT

NPDES permit WI0021008 · Major POTW · expired, expires 2025-06-30 · 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 2025-06-30 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

1values over a limit
0required values missing, on 0 form(s)
0of 42 forms filed late

Last period with anything received: 2026-06-30. Most often over: Solids, total suspended (1).

Reporting

Reports are due about 15 days after each monitoring period ends (the most common figure among WI permits in EPA's filings — check your permit).

Limits in force (23)

OutfallParameterStatisticLimitMonths
010Oxygen, dissolved [DO]DAILY MN >= 6 mg/L all year
010BOD, 5-day, 20 deg. CWKLY AVG <= 12 mg/L all year
010BOD, 5-day, 20 deg. CMO AVG <= 12 mg/L all year
010BOD, 5-day, 20 deg. CWKLY AVG <= 130 lb/d all year
010pHDAILY MN >= 6 SU all year
010pHDAILY MX <= 9 SU all year
010Solids, total suspendedWKLY AVG <= 83.4 lb/d all year
010Nitrogen, total [as N]QB report only all year
010Nitrogen, Kjeldahl, total [as N]QB report only all year
010Nitrite + Nitrate total [as N]QB report only all year
010Phosphorus, total [as P]MO AVG <= 10.57 lb/d all year
010Flow, in conduit or thru treatment plantMO AVG report only all year
010Flow, in conduit or thru treatment plantMO MAX report only all year
103Mercury, total recoverableQB report only all year
106Flow, in conduit or thru treatment plantMO AVG report only all year
106Flow, in conduit or thru treatment plantMO MAX report only all year
701BOD, 5-day, 20 deg. CMO AVG report only all year
701BOD, 5-day, 20 deg. CMO MAX report only all year
701Solids, total suspendedMO AVG report only all year
701Solids, total suspendedMO MAX report only all year
701Flow, in conduit or thru treatment plantMO AVG report only all year
701Flow, in conduit or thru treatment plantMO MAX report only all year
701Mercury, total recoverableQB 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