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Southern Illinois University - Edwardsville

Colleges And Universities, Edwardsville, Illinois. NPDES permit IL0046761, in force until Feb 28, 2029. Last 12 months: over a limit 3 times (last August 2026), 4 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (25 values), outfall INF form L monthly (4 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 2 of 24 reports late

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

Period endingParameterReportedLimitOver by
August 2026Nitrogen, ammonia total [as N], daily maximum4.58 mg/L≤ 1.1 mg/L316%
August 2026Nitrogen, ammonia total [as N], monthly average.54 mg/L≤ .2 mg/L170%
August 2026Nitrogen, ammonia total [as N], weekly average.54 mg/L≤ .4 mg/L35%

Limits in force (41)

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≤ 146 lb/dall year001
Solids, total suspendeddaily maximum≤ 292 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ .3 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ .2 mg/LJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 1.4 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 1.1 mg/LJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 3.7 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 2.4 lb/dJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 49 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 17 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 13 lb/dJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 84 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ .4 mg/LJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ .7 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]weekly average≤ 4.9 lb/dJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ 8.5 lb/dMar, Apr, May, Sep, Oct001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly average≤ 2.2 lb/dall 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 maximum≤ 400 #/100mLall year001
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≤ 122 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 244 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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Your permit document is the final word. As JSON: /api/v1/permits/IL0046761 · MCP: https://passage-data.com/mcp