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Marshall, City of

Sewage treatment plant, Marshall, Illinois. NPDES permit IL0068365, in force until Oct 31, 2030. Last 12 months: over a limit 2 times (last April 2026), 33 required values missing, 16 of 55 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (18 values), outfall 002 form 0 monthly (1 value), outfall 003 form 0 monthly (1 value), outfall 004 form 0 monthly (10 values), outfall INF form L monthly (4 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 32 required values missing, 18 of 60 reports late

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

Period endingParameterReportedLimitOver by
February 2026BOD, carbonaceous [5 day, 20 C], monthly average29.26 mg/L≤ 25 mg/L17%
April 2026Solids, total suspended, weekly average46 mg/L≤ 45 mg/L2%

Limits in force (36)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly average minimum≥ 5.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]minimum weekly average≥ 4 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]minimum weekly average≥ 6 mg/LMar–Jul001
Oxygen, dissolved [DO]daily minimum≥ 3.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LMar–Jul001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 37 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 417 lb/dall year001
Solids, total suspendedweekly average≤ 507 lb/dall year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualdaily maximum≤ .05 mg/Lall year001
Coliform, fecal generaldaily maximumreport only (#/100mL)May–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 281 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 450 lb/dall year001
Overflowsmonthly totalreport only (#/mo)all year002
Overflowsmonthly totalreport only (#/mo)all year003
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year004
BOD, 5-day, 20 deg. Cweekly averagereport only (mg/L)all year004
pHminimum≥ 6 SUall year004
pHmaximum≤ 9 SUall year004
Solids, total suspendedmonthly averagereport only (mg/L)all year004
Solids, total suspendedweekly averagereport only (mg/L)all year004
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year004
Chlorine, total residualdaily maximum≤ .75 mg/Lall year004
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year004
Flow, totalmonthly totalreport only (Mgal/mo)all year004
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/IL0068365 · MCP: https://passage-data.com/mcp