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Steeleville, Village of

Sewage treatment plant, Steeleville, Illinois. NPDES permit IL0031241, in force until May 31, 2031. Last 12 months: over a limit 28 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (19 values), outfall INF form L monthly (4 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
34 values over a limit, 0 required values missing, 0 of 24 reports late

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

All 28 values over a limit
Period endingParameterReportedLimitOver by
November 2025BOD, carbonaceous [5 day, 20 C], monthly average354 lb/d≤ 334 lb/d6%
January 2026Solids, total suspended, monthly average729 lb/d≤ 494 lb/d48%
January 2026Solids, total suspended, weekly average1324 lb/d≤ 600 lb/d121%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average27 mg/L≤ 25 mg/L8%
February 2026Solids, total suspended, monthly average72 mg/L≤ 37 mg/L95%
February 2026Solids, total suspended, weekly average91 mg/L≤ 45 mg/L102%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average105 mg/L≤ 25 mg/L320%
March 2026BOD, carbonaceous [5 day, 20 C], weekly average83 mg/L≤ 40 mg/L108%
March 2026Solids, total suspended, monthly average256 mg/L≤ 37 mg/L592%
March 2026Solids, total suspended, weekly average202 mg/L≤ 45 mg/L349%
April 2026BOD, carbonaceous [5 day, 20 C], monthly average373 lb/d≤ 334 lb/d12%
April 2026BOD, carbonaceous [5 day, 20 C], monthly average77 mg/L≤ 25 mg/L208%
April 2026BOD, carbonaceous [5 day, 20 C], weekly average87 mg/L≤ 40 mg/L118%
April 2026Solids, total suspended, monthly average152 mg/L≤ 37 mg/L311%
April 2026Solids, total suspended, weekly average164 mg/L≤ 45 mg/L264%
May 2026BOD, carbonaceous [5 day, 20 C], monthly average39 mg/L≤ 25 mg/L56%
May 2026BOD, carbonaceous [5 day, 20 C], weekly average46 mg/L≤ 40 mg/L15%
May 2026Solids, total suspended, monthly average129 mg/L≤ 37 mg/L249%
May 2026Solids, total suspended, weekly average137 mg/L≤ 45 mg/L204%
June 2026BOD, carbonaceous [5 day, 20 C], monthly average26 mg/L≤ 25 mg/L4%
June 2026Solids, total suspended, monthly average108 mg/L≤ 37 mg/L192%
June 2026Solids, total suspended, weekly average112 mg/L≤ 45 mg/L149%
July 2026BOD, carbonaceous [5 day, 20 C], monthly average52 mg/L≤ 25 mg/L108%
July 2026BOD, carbonaceous [5 day, 20 C], weekly average63 mg/L≤ 40 mg/L58%
July 2026Solids, total suspended, monthly average169 mg/L≤ 37 mg/L357%
July 2026Solids, total suspended, weekly average175 mg/L≤ 45 mg/L289%
September 2026Solids, total suspended, monthly average82 mg/L≤ 37 mg/L122%
September 2026Solids, total suspended, weekly average85 mg/L≤ 45 mg/L89%

Limits in force (25)

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≤ 494 lb/dall year001
Solids, total suspendedweekly average≤ 600 lb/dall year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (lb/d)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≤ 334 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 534 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

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/IL0031241 · MCP: https://passage-data.com/mcp