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Shawneetown, City of

Sewage treatment plant, Shawneetown, Illinois. NPDES permit IL0021776, in force until Nov 30, 2029. Last 12 months: over a limit 8 times (last August 2026), 6 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (15 values), outfall INF form L monthly (4 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 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 2025Solids, total suspended, monthly average41 mg/L≤ 30 mg/L37%
November 2025Solids, total suspended, monthly average62.5 mg/L≤ 30 mg/L108%
November 2025Solids, total suspended, weekly average68 mg/L≤ 45 mg/L51%
March 2026Chlorine, total residual, daily maximum1.76 mg/L≤ .75 mg/L135%
May 2026Coliform, fecal general, daily maximum108000 #/100mL≤ 400 #/100mL26900%
July 2026Coliform, fecal general, daily maximum2400 #/100mL≤ 400 #/100mL500%
July 2026pH, maximum9.1 SU≤ 9 SU—
August 2026Chlorine, total residual, daily maximum.81 mg/L≤ .75 mg/L8%

Limits in force (19)

ParameterStatisticLimitMonthsOutfall
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 300 lb/dall year001
Solids, total suspendedweekly average≤ 450 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≤ .75 mg/Lall year001
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year001
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≤ 250 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 400 lb/dall year001
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

How strict are these limits?

Cited limits by parameter: Illinois'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/IL0021776 · MCP: https://passage-data.com/mcp