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Rockdale Wastewater Treatment

Sewage treatment plant, Rockdale, Wisconsin. NPDES permit WI0026352 expired Dec 31, 2023; its limits still apply. Last 12 months: over a limit 3 times (last December 2025), 116 required values missing, 10 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 002 form A monthly (14 values), outfall 701 form A monthly (6 values)
Last report on file
March 2026
Oct 2024 – Sep 2025
7 values over a limit, 0 required values missing, 24 of 24 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
October 2025Phosphorus, total [as P], monthly average5.12≤ 4 mg/L28%
November 2025Phosphorus, total [as P], monthly average4.34≤ 4 mg/L9%
December 2025Phosphorus, total [as P], monthly average4.218≤ 4 mg/L5%

Limits in force (36)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year002
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year002
pHdaily minimum≥ 6 SUall year002
pHdaily maximum≤ 9 SUall year002
Solids, total suspendedweekly average≤ 45 mg/LJan, Mar, May, Jul, Oct, Dec002
Solids, total suspendedweekly average≤ 45 mg/LFeb002
Solids, total suspendedweekly average≤ 45 mg/LApr, Jun, Nov002
Solids, total suspendedweekly average≤ 45 mg/LAug002
Solids, total suspendedweekly average≤ 45 mg/LSep002
Solids, total suspendedmonthly average≤ 30 mg/LJan, Mar, May, Jul, Oct, Dec002
Solids, total suspendedmonthly average≤ 30 mg/LFeb002
Solids, total suspendedmonthly average≤ 30 mg/LApr, Jun, Nov002
Solids, total suspendedmonthly average≤ 30 mg/LAug002
Solids, total suspendedmonthly average≤ 30 mg/LSep002
Solids, total suspendedmonthly average≤ 5.81 lb/dJan, Mar, May, Jul, Oct, Dec002
Solids, total suspendedmonthly average≤ 7.14 lb/dFeb002
Solids, total suspendedmonthly average≤ 6.67 lb/dApr, Jun, Nov002
Solids, total suspendedmonthly average≤ 4.52 lb/dAug002
Solids, total suspendedmonthly average≤ 4.67 lb/dSep002
Solids, total suspendedweekly average≤ 8.59 lb/dJan, Mar, May, Jul, Oct, Dec002
Solids, total suspendedweekly average≤ 10.6 lb/dFeb002
Solids, total suspendedweekly average≤ 9.87 lb/dApr, Jun, Nov002
Solids, total suspendedweekly average≤ 6.68 lb/dAug002
Solids, total suspendedweekly average≤ 6.91 lb/dSep002
Phosphorus, total [as P]monthly average≤ 4 mg/Lall year002
Phosphorus, total [as P]monthly averagereport only (lb/d)all year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Coliform, fecal generalweekly geometric mean≤ 656 #/100mLMay–Sep002
Coliform, fecal generalgeometric mean≤ 400 #/100mLMay–Sep002
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/WI0026352 · MCP: https://passage-data.com/mcp