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United School District #304, South Campus

Elementary And Secondary Schools, Monmouth, Illinois. NPDES permit IL0053651, in force until Oct 31, 2029. Last 12 months: over a limit 20 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (23 values), outfall INF form L monthly (4 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
53 values over a limit, 0 required values missing, 0 of 24 reports late

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

All 20 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, carbonaceous [5 day, 20 C], monthly average13 mg/L≤ 10 mg/L30%
October 2025Nitrogen, ammonia total [as N], monthly average2.5 mg/L≤ 1.4 mg/L79%
October 2025Nitrogen, ammonia total [as N], weekly average1 lb/d≤ .79 lb/d27%
October 2025Solids, total suspended, monthly average22 mg/L≤ 12 mg/L83%
November 2025Nitrogen, ammonia total [as N], daily maximum5.5 mg/L≤ 3.4 mg/L62%
November 2025Nitrogen, ammonia total [as N], monthly average5.5 mg/L≤ 3.3 mg/L67%
November 2025Solids, total suspended, monthly average18 mg/L≤ 12 mg/L50%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average15 mg/L≤ 10 mg/L50%
February 2026Nitrogen, ammonia total [as N], daily maximum5 mg/L≤ 3.4 mg/L47%
February 2026Nitrogen, ammonia total [as N], monthly average5 mg/L≤ 3.3 mg/L52%
February 2026Solids, total suspended, monthly average22 mg/L≤ 12 mg/L83%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average13 mg/L≤ 10 mg/L30%
March 2026Nitrogen, ammonia total [as N], monthly average4 mg/L≤ 1.5 mg/L167%
March 2026Nitrogen, ammonia total [as N], weekly average4 mg/L≤ 3.8 mg/L5%
March 2026Solids, total suspended, monthly average19 mg/L≤ 12 mg/L58%
April 2026BOD, carbonaceous [5 day, 20 C], monthly average13 mg/L≤ 10 mg/L30%
April 2026Nitrogen, ammonia total [as N], monthly average3.75 mg/L≤ 1.4 mg/L168%
April 2026Oxygen, dissolved [DO], daily minimum4.5 mg/L≥ 5 mg/L10%
April 2026Oxygen, dissolved [DO], minimum weekly average4.5 mg/L≥ 6 mg/L25%
September 2026Solids, total suspended, monthly average21.5 mg/L≤ 12 mg/L79%

Limits in force (45)

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≤ 12 mg/Lall year001
Solids, total suspendeddaily maximum≤ 24 mg/Lall year001
Solids, total suspendedmonthly average≤ 2.5 lb/dall year001
Solids, total suspendeddaily maximum≤ 5 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LMar001
Nitrogen, ammonia total [as N]monthly average≤ 1.4 mg/LApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 1.3 mg/LJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 3.3 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 5.4 mg/LApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 3.7 mg/LJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 3.4 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ .31 lb/dMar001
Nitrogen, ammonia total [as N]monthly average≤ .29 lb/dApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ .27 lb/dJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ .69 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 1.2 lb/dMar001
Nitrogen, ammonia total [as N]daily maximum≤ 1.1 lb/dApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ .77 lb/dJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ .71 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 3.3 mg/LJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ 3.8 mg/LMar001
Nitrogen, ammonia total [as N]weekly average≤ 3.8 mg/LApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]weekly average≤ .69 lb/dJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ .79 lb/dMar001
Nitrogen, ammonia total [as N]weekly average≤ .79 lb/dApr, May, Sep, Oct001
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≤ 10 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 2.1 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 4.2 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.

Same industry: the 52 Educational Services permits in Illinois.

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