City of Osseo

NPDES permit WI0025046 · Minor NON-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

0values over a limit
56required values missing, on 8 form(s)
0of 25 forms filed late

Last period with anything received: 2026-06-30.

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 (16)

OutfallParameterStatisticLimitMonths
004BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
004BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
004pHDAILY MN >= 6 SU all year
004pHDAILY MX <= 9 SU all year
004Solids, total suspendedWKLY AVG <= 45 mg/L all year
004Solids, total suspendedMO AVG <= 30 mg/L all year
004Phosphorus, total [as P]MO AVG <= .8 mg/L all year
004Phosphorus, total [as P]ANNL AVG report only all year
004Phosphorus, total [as P]ANNL MAX report only all year
004Zinc, total recoverableQB report only all year
004Flow, in conduit or thru treatment plantMO AVG report only all year
004Flow, in conduit or thru treatment plantMO MAX report only all year
702BOD, 5-day, 20 deg. CMO AVG report only all year
702BOD, 5-day, 20 deg. CMO MAX report only all year
702Solids, total suspendedMO AVG report only all year
702Solids, total suspendedMO MAX 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