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Central High School and Nash Middle School

Elementary And Secondary Schools, Clifton, Illinois. NPDES permit IL0037206, in force until Mar 31, 2028. Last 12 months: over a limit 39 times (last September 2026), 2 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form 0 monthly (46 values)
Renewal application due
Oct 3, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
31 values over a limit, 0 required values missing, 4 of 12 reports late

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

All 39 values over a limit
Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], daily maximum19.6 mg/L≤ 5.2 mg/L277%
October 2025Nitrogen, ammonia total [as N], daily maximum4.25 lb/d≤ 1.1 lb/d286%
October 2025Nitrogen, ammonia total [as N], monthly average1.63 lb/d≤ .33 lb/d394%
October 2025Nitrogen, ammonia total [as N], monthly average19.6 mg/L≤ 1.5 mg/L1207%
October 2025Nitrogen, ammonia total [as N], weekly average1.63 lb/d≤ .82 lb/d99%
October 2025Nitrogen, ammonia total [as N], weekly average19.6 mg/L≤ 3.8 mg/L416%
January 2026BOD, carbonaceous [5 day, 20 C], monthly average12 mg/L≤ 10 mg/L20%
January 2026Nitrogen, ammonia total [as N], daily maximum27.4 mg/L≤ 5.7 mg/L381%
January 2026Nitrogen, ammonia total [as N], daily maximum5.9 lb/d≤ 1.2 lb/d392%
January 2026Nitrogen, ammonia total [as N], monthly average2.28 lb/d≤ .56 lb/d307%
January 2026Nitrogen, ammonia total [as N], monthly average27.4 mg/L≤ 2.6 mg/L954%
January 2026Solids, total suspended, monthly average18 mg/L≤ 12 mg/L50%
February 2026Nitrogen, ammonia total [as N], daily maximum12.92 lb/d≤ 1.2 lb/d977%
February 2026Nitrogen, ammonia total [as N], daily maximum59.6 mg/L≤ 5.7 mg/L946%
February 2026Nitrogen, ammonia total [as N], monthly average4.97 lb/d≤ .56 lb/d788%
February 2026Nitrogen, ammonia total [as N], monthly average59.6 mg/L≤ 2.6 mg/L2192%
February 2026Solids, total suspended, daily maximum29 mg/L≤ 24 mg/L21%
February 2026Solids, total suspended, daily maximum6.28 lb/d≤ 5.2 lb/d21%
February 2026Solids, total suspended, monthly average29 mg/L≤ 12 mg/L142%
March 2026BOD, carbonaceous [5 day, 20 C], daily maximum21 mg/L≤ 20 mg/L5%
March 2026BOD, carbonaceous [5 day, 20 C], daily maximum4.55 lb/d≤ 4.3 lb/d6%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average21 mg/L≤ 10 mg/L110%
March 2026Nitrogen, ammonia total [as N], daily maximum15.8 lb/d≤ 1.1 lb/d1336%
March 2026Nitrogen, ammonia total [as N], daily maximum72.9 mg/L≤ 5.2 mg/L1302%
March 2026Nitrogen, ammonia total [as N], monthly average6.07 lb/d≤ .33 lb/d1739%
March 2026Nitrogen, ammonia total [as N], monthly average72.9 mg/L≤ 1.5 mg/L4760%
March 2026Nitrogen, ammonia total [as N], weekly average6.1 lb/d≤ .82 lb/d644%
March 2026Nitrogen, ammonia total [as N], weekly average72.9 mg/L≤ 3.8 mg/L1818%
May 2026Nitrogen, ammonia total [as N], daily maximum1.93 lb/d≤ 1.1 lb/d75%
May 2026Nitrogen, ammonia total [as N], daily maximum8.9 mg/L≤ 5.2 mg/L71%
May 2026Nitrogen, ammonia total [as N], monthly average.742 lb/d≤ .33 lb/d125%
May 2026Nitrogen, ammonia total [as N], monthly average8.9 mg/L≤ 1.5 mg/L493%
May 2026Nitrogen, ammonia total [as N], weekly average1.48 lb/d≤ .82 lb/d80%
May 2026Nitrogen, ammonia total [as N], weekly average8.9 mg/L≤ 3.8 mg/L134%
September 2026Nitrogen, ammonia total [as N], daily maximum12.3 mg/L≤ 5.2 mg/L137%
September 2026Nitrogen, ammonia total [as N], monthly average.87 lb/d≤ .33 lb/d164%
September 2026Nitrogen, ammonia total [as N], monthly average12.3 mg/L≤ 1.5 mg/L720%
September 2026Nitrogen, ammonia total [as N], weekly average.93 lb/d≤ .82 lb/d13%
September 2026Nitrogen, ammonia total [as N], weekly average12.3 mg/L≤ 3.8 mg/L224%

Limits in force (118)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]monthly average minimum≥ 5.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec
Oxygen, dissolved [DO]monthly average minimum≥ 5.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec
Oxygen, dissolved [DO]minimum weekly average≥ 4 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec
Oxygen, dissolved [DO]minimum weekly average≥ 4 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec
Oxygen, dissolved [DO]minimum weekly average≥ 6 mg/LMar–Jul
Oxygen, dissolved [DO]minimum weekly average≥ 6 mg/LMar–Jul
Oxygen, dissolved [DO]daily minimum≥ 3.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec
Oxygen, dissolved [DO]daily minimum≥ 3.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LMar–Jul
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LMar–Jul
pHminimum≥ 6 SUall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 12 mg/Lall year
Solids, total suspendedmonthly average≤ 12 mg/Lall year
Solids, total suspendedmonthly average≤ 12 mg/Lall year
Solids, total suspendedmonthly average≤ 12 mg/Lall year
Solids, total suspendeddaily maximum≤ 24 mg/Lall year
Solids, total suspendeddaily maximum≤ 24 mg/Lall year
Solids, total suspendeddaily maximum≤ 24 mg/Lall year
Solids, total suspendeddaily maximum≤ 24 mg/Lall year
Solids, total suspendedmonthly average≤ 2.6 lb/dall year
Solids, total suspendedmonthly average≤ 2.6 lb/dall year
Solids, total suspendedmonthly average≤ 2.6 lb/dall year
Solids, total suspendedmonthly average≤ 2.6 lb/dall year
Solids, total suspendeddaily maximum≤ 5.2 lb/dall year
Solids, total suspendeddaily maximum≤ 5.2 lb/dall year
Solids, total suspendeddaily maximum≤ 5.2 lb/dall year
Solids, total suspendeddaily maximum≤ 5.2 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]monthly average≤ 1.1 mg/LJun–Aug
Nitrogen, ammonia total [as N]monthly average≤ 1.1 mg/LJun–Aug
Nitrogen, ammonia total [as N]monthly average≤ 2.6 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 2.6 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]monthly average≤ 1.1 mg/LJun–Aug
Nitrogen, ammonia total [as N]monthly average≤ 1.1 mg/LJun–Aug
Nitrogen, ammonia total [as N]monthly average≤ 2.6 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 2.6 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 5.2 mg/LMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]daily maximum≤ 5.2 mg/LMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LJun–Aug
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LJun–Aug
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 5.2 mg/LMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]daily maximum≤ 5.2 mg/LMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LJun–Aug
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LJun–Aug
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ .33 lb/dMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]monthly average≤ .33 lb/dMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]monthly average≤ .24 lb/dJun–Aug
Nitrogen, ammonia total [as N]monthly average≤ .24 lb/dJun–Aug
Nitrogen, ammonia total [as N]monthly average≤ .56 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ .56 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ .33 lb/dMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]monthly average≤ .33 lb/dMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]monthly average≤ .24 lb/dJun–Aug
Nitrogen, ammonia total [as N]monthly average≤ .24 lb/dJun–Aug
Nitrogen, ammonia total [as N]monthly average≤ .56 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ .56 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 1.1 lb/dMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]daily maximum≤ 1.1 lb/dMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]daily maximum≤ 1.2 lb/dJun–Aug
Nitrogen, ammonia total [as N]daily maximum≤ 1.2 lb/dJun–Aug
Nitrogen, ammonia total [as N]daily maximum≤ 1.2 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 1.2 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 1.1 lb/dMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]daily maximum≤ 1.1 lb/dMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]daily maximum≤ 1.2 lb/dJun–Aug
Nitrogen, ammonia total [as N]daily maximum≤ 1.2 lb/dJun–Aug
Nitrogen, ammonia total [as N]daily maximum≤ 1.2 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 1.2 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 2.8 mg/LJun–Aug
Nitrogen, ammonia total [as N]weekly average≤ 2.8 mg/LJun–Aug
Nitrogen, ammonia total [as N]weekly average≤ 3.8 mg/LMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]weekly average≤ 3.8 mg/LMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]weekly average≤ 3.8 mg/LMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]weekly average≤ 3.8 mg/LMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]weekly average≤ 2.8 mg/LJun–Aug
Nitrogen, ammonia total [as N]weekly average≤ 2.8 mg/LJun–Aug
Nitrogen, ammonia total [as N]weekly average≤ .61 lb/dJun–Aug
Nitrogen, ammonia total [as N]weekly average≤ .61 lb/dJun–Aug
Nitrogen, ammonia total [as N]weekly average≤ .82 lb/dMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]weekly average≤ .82 lb/dMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]weekly average≤ .82 lb/dMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]weekly average≤ .82 lb/dMar, Apr, May, Sep, Oct
Nitrogen, ammonia total [as N]weekly average≤ .61 lb/dJun–Aug
Nitrogen, ammonia total [as N]weekly average≤ .61 lb/dJun–Aug
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualdaily maximum≤ .05 mg/Lall year
Chlorine, total residualdaily maximum≤ .05 mg/Lall year
Coliform, fecal generaldaily maximumreport only (#/100mL)May–Oct
Coliform, fecal generaldaily maximumreport only (#/100mL)May–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 2.2 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 2.2 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 2.2 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 2.2 lb/dall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 4.3 lb/dall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 4.3 lb/dall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 4.3 lb/dall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 4.3 lb/dall year

How strict are these limits?

Cited limits by parameter: Illinois's rules and the federal ones.

Same industry: the 52 Educational Services permits in Illinois.

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