VILLAGE OF RIO

NPDES permit WI0020117 · Minor POTW · expired, expires 2023-09-30 · 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 2023-09-30 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

0values over a limit
39required values missing, on 5 form(s)
9of 13 forms filed late

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

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 (25)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]DAILY MN >= 4 mg/L Sep, Oct, Nov
001BOD, 5-day, 20 deg. CWKLY AVG <= 30 mg/L Sep, Oct, Nov
001BOD, 5-day, 20 deg. CMO AVG <= 20 mg/L Sep, Oct, Nov
001pHDAILY MN >= 6 SU Sep, Oct, Nov
001pHDAILY MX <= 9 SU Sep, Oct, Nov
001Solids, total suspendedWKLY AVG <= 30 mg/L Sep, Oct, Nov
001Solids, total suspendedMO AVG <= 20 mg/L Sep, Oct, Nov
001Nitrogen, ammonia total [as N]WKLY AVG <= 7.3 mg/L Sep
001Nitrogen, ammonia total [as N]WKLY AVG <= 12 mg/L Oct
001Nitrogen, ammonia total [as N]WKLY AVG <= 12 mg/L Nov
001Nitrogen, ammonia total [as N]MO AVG <= 3 mg/L Sep
001Nitrogen, ammonia total [as N]MO AVG <= 5 mg/L Oct
001Nitrogen, ammonia total [as N]MO AVG <= 4.8 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 14 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 13 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 12 mg/L Nov
001Phosphorus, total [as P]MO AVG <= 1 mg/L Sep, Oct, Nov
001Chloride [as Cl]DAILY MX report only Sep, Oct, Nov
001Flow, in conduit or thru treatment plantDAILY MX <= .364 MGD Sep, Oct, Nov
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
701Flow, in conduit or thru treatment plantMO AVG report only all year
701Flow, in conduit or thru treatment plantDAILY 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