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Greenfield, City of

Sewage treatment plant, Greenfield, Illinois. NPDES permit IL0029076, in force until Jun 30, 2029. Last 12 months: over a limit 10 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
0 values over a limit, 0 required values missing, 0 of 24 reports late

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

Period endingParameterReportedLimitOver by
October 2025Solids, total suspended, monthly average43 mg/L≤ 37 mg/L16%
October 2025pH, maximum9.1 SU≤ 9 SU—
April 2026Oxygen, dissolved [DO], minimum weekly average5.7 mg/L≥ 6 mg/L5%
May 2026Oxygen, dissolved [DO], minimum weekly average5.5 mg/L≥ 6 mg/L8%
June 2026Oxygen, dissolved [DO], daily minimum4.3 mg/L≥ 5 mg/L14%
June 2026Oxygen, dissolved [DO], minimum weekly average4.3 mg/L≥ 6 mg/L28%
July 2026Oxygen, dissolved [DO], daily minimum3.7 mg/L≥ 5 mg/L26%
July 2026Oxygen, dissolved [DO], minimum weekly average3.7 mg/L≥ 6 mg/L38%
August 2026Oxygen, dissolved [DO], monthly average minimum5.2 mg/L≥ 5.5 mg/L5%
August 2026pH, maximum9.3 SU≤ 9 SU—

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≤ 37 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 161 lb/dall year001
Solids, total suspendedweekly average≤ 196 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)all 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≤ 109 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 175 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/IL0029076 · MCP: https://passage-data.com/mcp