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Monmouth, City of

Sewage treatment plant, Monmouth, Illinois. NPDES permit IL0021253, in force until Sep 30, 2029. Last 12 months: no values over a limit, 8 of 88 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 002 form 0 monthly (10 values), outfall 003 form 0 monthly (1 value), outfall A04 form 0 monthly (1 value), outfall B04 form 0 monthly (1 value), outfall C04 form 0 monthly (1 value), outfall D04 form 0 monthly (1 value), and 2 more forms
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 96 reports late

Limits in force (20)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year002
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Solids, total suspendedmonthly averagereport only (mg/L)all year002
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year002
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year002
Phosphorus, total [as P]monthly averagereport only (mg/L)all year002
Chlorine, total residualmonthly average≤ .75 mg/Lall year002
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year002
Flow, totalmonthly totalreport only (Mgal/mo)all year002
Overflowsmonthly totalreport only (#/mo)all year003
Overflowsmonthly totalreport only (#/mo)all yearA04
Overflowsmonthly totalreport only (#/mo)all yearB04
Overflowsmonthly totalreport only (#/mo)all yearC04
Overflowsmonthly totalreport only (#/mo)all yearD04
Overflowsmonthly totalreport only (#/mo)all yearE04
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearINF
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINF

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IL0021253 · MCP: https://passage-data.com/mcp