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Otter Creek Lake Utility District

Combination Utilities, Davis, Illinois. NPDES permit IL0048593, in force until Jul 31, 2028. Last 12 months: over a limit 14 times (last June 2026). 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
Feb 2, 2028 · 180 days before expiry; your permit may set another date
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 14 values over a limit
Period endingParameterReportedLimitOver by
February 2026Nitrogen, ammonia total [as N], daily maximum13.9 mg/L≤ 6.6 mg/L111%
May 2026Nitrogen, ammonia total [as N], daily maximum16.9 mg/L≤ 3 mg/L463%
May 2026Nitrogen, ammonia total [as N], daily maximum31 lb/d≤ 25 lb/d24%
May 2026Nitrogen, ammonia total [as N], monthly average14.2 lb/d≤ 13 lb/d9%
May 2026Nitrogen, ammonia total [as N], monthly average7.8 mg/L≤ 1.5 mg/L420%
May 2026Oxygen, dissolved [DO], daily minimum3.5 mg/L≥ 5 mg/L30%
May 2026Oxygen, dissolved [DO], minimum weekly average5.2 mg/L≥ 6 mg/L13%
May 2026Solids, total suspended, daily maximum33 mg/L≤ 24 mg/L38%
May 2026Solids, total suspended, monthly average13 mg/L≤ 12 mg/L8%
June 2026Nitrogen, ammonia total [as N], daily maximum17.7 mg/L≤ 3 mg/L490%
June 2026Nitrogen, ammonia total [as N], daily maximum30.4 lb/d≤ 25 lb/d22%
June 2026Nitrogen, ammonia total [as N], monthly average16.7 lb/d≤ 10 lb/d67%
June 2026Nitrogen, ammonia total [as N], monthly average8.9 mg/L≤ 1.2 mg/L642%
June 2026Solids, total suspended, monthly average16 mg/L≤ 12 mg/L33%

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≤ 100 lb/dall year001
Solids, total suspendeddaily maximum≤ 200 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 3.7 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≤ 6.6 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 4.5 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≤ 31 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 13 lb/dMar001
Nitrogen, ammonia total [as N]monthly average≤ 13 lb/dApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 10 lb/dJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 55 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 38 lb/dMar001
Nitrogen, ammonia total [as N]daily maximum≤ 25 lb/dApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 25 lb/dJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ 3.8 mg/LMar001
Nitrogen, ammonia total [as N]weekly average≤ 32 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≤ 83 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 167 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 4 Combination Utilities 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/IL0048593 · MCP: https://passage-data.com/mcp