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Beloit City

Sewage treatment plant, major discharger, Beloit, Wisconsin. NPDES permit WI0023370 expired Sep 30, 2025; its limits still apply. Last 12 months: over a limit once (last April 2026), 21 required values missing, 4 of 29 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: outfall 001 form A monthly (12 values), outfall 001 form Q quarterly (10 values), outfall 107 form Q quarterly (1 value), outfall 701 form A monthly (7 values), outfall 701 form Q quarterly (7 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
0 values over a limit, 36 required values missing, 9 of 36 reports late

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

Period endingParameterReportedLimitOver by
April 2026Phosphorus, total [as P], monthly average19.6667≤ 18.5 lb/d6%

Limits in force (37)

ParameterStatisticLimitMonthsOutfall
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Nitrogen, total [as N]quarterly maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]weekly average≤ 17 mg/Lall year001
Nitrogen, ammonia total [as N]monthly average≤ 17 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximum≤ 17 mg/Lall year001
Nitrogen, Kjeldahl, total [as N]quarterly maximumreport only (mg/L)all year001
Nitrite + Nitrate total [as N]quarterly maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly average≤ 18.5 lb/dall year001
Nickel, total recoverablequarterly maximumreport only (ug/L)all year001
Zinc, total recoverablequarterly maximumreport only (ug/L)all year001
Cadmium, total recoverablequarterly maximumreport only (ug/L)all year001
Lead, total recoverablequarterly maximumreport only (ug/L)all year001
Chromium, total recoverablequarterly maximumreport only (ug/L)all year001
Copper, total recoverablequarterly maximumreport only (ug/L)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all year001
Mercury, total recoverablequarterly maximumreport only (ng/L)all year001
BOD, carbonaceous [5 day, 5 C]weekly average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 5 C]monthly average≤ 25 mg/Lall year001
Mercury, total recoverablequarterly maximumreport only (ng/L)all year107
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year701
BOD, 5-day, 20 deg. Cmonthly maximumreport only (mg/L)all year701
Solids, total suspendedmonthly averagereport only (mg/L)all year701
Solids, total suspendedmonthly maximumreport only (mg/L)all year701
Nickel, total recoverablequarterly maximumreport only (ug/L)all year701
Zinc, total recoverablequarterly maximumreport only (ug/L)all year701
Cadmium, total recoverablequarterly maximumreport only (ug/L)all year701
Lead, total recoverablequarterly maximumreport only (ug/L)all year701
Chromium, total recoverablequarterly maximumreport only (ug/L)all year701
Copper, total recoverablequarterly maximumreport only (ug/L)all year701
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year701
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all year701
Mercury, total recoverablequarterly maximumreport only (ng/L)all year701
BOD, carbonaceous [5 day, 5 C]monthly maximumreport only (mg/L)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/WI0023370 · MCP: https://passage-data.com/mcp