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Chesterfield, Village of

Sewage treatment plant, Chesterfield, Illinois. NPDES permit IL0071331, in force until Mar 31, 2030. Last 12 months: over a limit 13 times (last August 2026), 2 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (18 values), outfall INF form L monthly (4 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
6 values over a limit, 0 required values missing, 0 of 24 reports late

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

All 13 values over a limit
Period endingParameterReportedLimitOver by
October 2025Oxygen, dissolved [DO], minimum weekly average3.5 mg/L≥ 4 mg/L13%
October 2025Oxygen, dissolved [DO], monthly average minimum3.5 mg/L≥ 5.5 mg/L36%
November 2025Oxygen, dissolved [DO], monthly average minimum5.1 mg/L≥ 5.5 mg/L7%
April 2026Oxygen, dissolved [DO], minimum weekly average5 mg/L≥ 6 mg/L17%
May 2026Oxygen, dissolved [DO], daily minimum3.9 mg/L≥ 5 mg/L22%
May 2026Oxygen, dissolved [DO], minimum weekly average3.9 mg/L≥ 6 mg/L35%
June 2026Oxygen, dissolved [DO], daily minimum1.5 mg/L≥ 5 mg/L70%
June 2026Oxygen, dissolved [DO], minimum weekly average1.5 mg/L≥ 6 mg/L75%
July 2026Oxygen, dissolved [DO], daily minimum1 mg/L≥ 5 mg/L80%
July 2026Oxygen, dissolved [DO], minimum weekly average1 mg/L≥ 6 mg/L83%
August 2026Oxygen, dissolved [DO], daily minimum1.5 mg/L≥ 3.5 mg/L57%
August 2026Oxygen, dissolved [DO], minimum weekly average1.5 mg/L≥ 4 mg/L63%
August 2026Oxygen, dissolved [DO], monthly average minimum1.5 mg/L≥ 5.5 mg/L73%

Limits in force (24)

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≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 26 lb/dall year001
Solids, total suspendedweekly average≤ 39 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≤ 22 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 35 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/IL0071331 · MCP: https://passage-data.com/mcp