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Community Unit School District #27

Elementary And Secondary Schools, Concord, Illinois. NPDES permit IL0024481, in force until Apr 30, 2029. Last 12 months: over a limit 16 times (last September 2026). 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
September 2026
Oct 2024 – Sep 2025
5 values over a limit, 0 required values missing, 0 of 24 reports late

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

All 16 values over a limit
Period endingParameterReportedLimitOver by
October 2025Oxygen, dissolved [DO], minimum weekly average3.7 mg/L≥ 4 mg/L8%
October 2025Oxygen, dissolved [DO], monthly average minimum3.7 mg/L≥ 5.5 mg/L33%
December 2025Oxygen, dissolved [DO], monthly average minimum5.48 mg/L≥ 5.5 mg/L0%
January 2026BOD, carbonaceous [5 day, 20 C], monthly average28 mg/L≤ 25 mg/L12%
January 2026Oxygen, dissolved [DO], daily minimum3.06 mg/L≥ 3.5 mg/L13%
January 2026Oxygen, dissolved [DO], minimum weekly average3.06 mg/L≥ 4 mg/L24%
January 2026Oxygen, dissolved [DO], monthly average minimum3.06 mg/L≥ 5.5 mg/L44%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average31 mg/L≤ 25 mg/L24%
February 2026Oxygen, dissolved [DO], minimum weekly average3.8 mg/L≥ 4 mg/L5%
February 2026Oxygen, dissolved [DO], monthly average minimum3.8 mg/L≥ 5.5 mg/L31%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average25.85 mg/L≤ 25 mg/L3%
March 2026Oxygen, dissolved [DO], minimum weekly average5.74 mg/L≥ 6 mg/L4%
April 2026Oxygen, dissolved [DO], daily minimum4.38 mg/L≥ 5 mg/L12%
April 2026Oxygen, dissolved [DO], minimum weekly average4.38 mg/L≥ 6 mg/L27%
June 2026Oxygen, dissolved [DO], minimum weekly average5.91 mg/L≥ 6 mg/L2%
September 2026Oxygen, dissolved [DO], monthly average minimum5.23 mg/L≥ 5.5 mg/L5%

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≤ 14 lb/dall year001
Solids, total suspendedweekly average≤ 16 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≤ 9.1 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 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.

Same industry: the 52 Educational Services permits in Illinois.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IL0024481 · MCP: https://passage-data.com/mcp