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Southwestern Senior High School

Elementary And Secondary Schools, Piasa, Illinois. NPDES permit IL0045641, in force until Jun 30, 2027. Last 12 months: over a limit 23 times (last May 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 (21 values), outfall INF form L monthly (4 values)
Renewal application due
Jan 1, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
15 values over a limit, 73 required values missing, 8 of 24 reports late

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

All 23 values over a limit
Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], daily maximum13.5 mg/L≤ 3 mg/L350%
October 2025Nitrogen, ammonia total [as N], monthly average13.5 mg/L≤ 1.5 mg/L800%
October 2025Oxygen, dissolved [DO], daily minimum2.1 mg/L≥ 3.5 mg/L40%
October 2025Oxygen, dissolved [DO], minimum weekly average2.1 mg/L≥ 4 mg/L48%
October 2025Oxygen, dissolved [DO], monthly average minimum2.1 mg/L≥ 5.5 mg/L62%
November 2025Nitrogen, ammonia total [as N], daily maximum6.6 mg/L≤ 6.3 mg/L5%
November 2025Nitrogen, ammonia total [as N], monthly average6.6 mg/L≤ 2.7 mg/L144%
November 2025Oxygen, dissolved [DO], monthly average minimum4.2 mg/L≥ 5.5 mg/L24%
December 2025Nitrogen, ammonia total [as N], monthly average3.8 mg/L≤ 2.7 mg/L41%
December 2025Oxygen, dissolved [DO], monthly average minimum5.1 mg/L≥ 5.5 mg/L7%
January 2026Nitrogen, ammonia total [as N], monthly average4.7 mg/L≤ 2.7 mg/L74%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average13 mg/L≤ 10 mg/L30%
February 2026Nitrogen, ammonia total [as N], daily maximum37 mg/L≤ 6.3 mg/L487%
February 2026Nitrogen, ammonia total [as N], monthly average.8 lb/d≤ .79 lb/d1%
February 2026Nitrogen, ammonia total [as N], monthly average37 mg/L≤ 2.7 mg/L1270%
February 2026Oxygen, dissolved [DO], minimum weekly average3.75 mg/L≥ 4 mg/L6%
February 2026Oxygen, dissolved [DO], monthly average minimum3.75 mg/L≥ 5.5 mg/L32%
February 2026Solids, total suspended, monthly average21 mg/L≤ 12 mg/L75%
March 2026Nitrogen, ammonia total [as N], monthly average2.23 mg/L≤ 1.5 mg/L49%
April 2026Nitrogen, ammonia total [as N], monthly average2.74 mg/L≤ 1.5 mg/L83%
April 2026Oxygen, dissolved [DO], daily minimum3.8 mg/L≥ 5 mg/L24%
April 2026Oxygen, dissolved [DO], minimum weekly average3.8 mg/L≥ 6 mg/L37%
May 2026Nitrogen, ammonia total [as N], monthly average2.5 mg/L≤ 1.5 mg/L67%

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≤ 3.5 lb/dall year001
Solids, total suspendeddaily maximum≤ 7 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 2.7 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LMar001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 1.2 mg/LJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 6.3 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 4.8 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ .79 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ .44 lb/dMar001
Nitrogen, ammonia total [as N]monthly average≤ .44 lb/dApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ .35 lb/dJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 1.8 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 1.4 lb/dMar001
Nitrogen, ammonia total [as N]daily maximum≤ .88 lb/dApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ .88 lb/dJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ 3.7 mg/LMar001
Nitrogen, ammonia total [as N]weekly average≤ 1.1 lb/dMar001
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≤ 2.9 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 5.8 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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