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Village of Rio

Sewage treatment plant, Rio, Wisconsin. NPDES permit WI0020117 expired Sep 30, 2023; its limits still apply. Last 12 months: no values over a limit, 50 required values missing, 7 of 13 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (13 values), outfall 701 form A monthly (6 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
2 values over a limit, 3 required values missing, 14 of 15 reports late

Limits in force (25)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 4 mg/LSep–Nov001
BOD, 5-day, 20 deg. Cweekly average≤ 30 mg/LSep–Nov001
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/LSep–Nov001
pHdaily minimum≥ 6 SUSep–Nov001
pHdaily maximum≤ 9 SUSep–Nov001
Solids, total suspendedweekly average≤ 30 mg/LSep–Nov001
Solids, total suspendedmonthly average≤ 20 mg/LSep–Nov001
Nitrogen, ammonia total [as N]weekly average≤ 7.3 mg/LSep001
Nitrogen, ammonia total [as N]weekly average≤ 12 mg/LOct001
Nitrogen, ammonia total [as N]weekly average≤ 12 mg/LNov001
Nitrogen, ammonia total [as N]monthly average≤ 3 mg/LSep001
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/LOct001
Nitrogen, ammonia total [as N]monthly average≤ 4.8 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 14 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 13 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 12 mg/LNov001
Phosphorus, total [as P]monthly average≤ 1 mg/LSep–Nov001
Chloride [as Cl]daily maximumreport only (mg/L)Sep–Nov001
Flow, in conduit or thru treatment plantdaily maximum≤ .364 MGDSep–Nov001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year701
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year701
Solids, total suspendedmonthly averagereport only (mg/L)all year701
Solids, total suspendeddaily maximumreport only (mg/L)all year701
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year701
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year701

How strict are these limits?

Cited limits by parameter: Wisconsin's rules and the federal ones.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WI0020117 · MCP: https://passage-data.com/mcp