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Clay City, Village of

Sewage treatment plant, Clay City, Illinois. NPDES permit IL0020974, in force until Sep 30, 2029. Last 12 months: over a limit 8 times (last September 2026). 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
12 values over a limit, 2 required values missing, 1 of 24 reports late

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

Period endingParameterReportedLimitOver by
October 2025Coliform, fecal - % samples exceeding limit, maximum100 %≤ 10 %900%
October 2025Coliform, fecal general, geometric mean716 #/100mL≤ 200 #/100mL258%
November 2025Nitrogen, ammonia total [as N], monthly average5.9 mg/L≤ 5.6 mg/L5%
January 2026Nitrogen, ammonia total [as N], monthly average6.85 mg/L≤ 5.6 mg/L22%
February 2026Nitrogen, ammonia total [as N], monthly average8.3 mg/L≤ 5.6 mg/L48%
July 2026Phosphorus, total [as P], monthly average3.65 mg/L≤ 1.2 mg/L204%
August 2026Phosphorus, total [as P], monthly average1.28 mg/L≤ 1.2 mg/L7%
September 2026Phosphorus, total [as P], monthly average1.28 mg/L≤ 1.2 mg/L7%

Limits in force (39)

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≤ 37 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 185 lb/dall year001
Solids, total suspendedweekly average≤ 225 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 2.2 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 2.1 mg/LJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 5.6 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 10.1 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 13.3 mg/LJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 9.1 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 11 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 11 lb/dJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 28 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 51 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 67 lb/dJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 46 lb/dJan, Feb, Nov, Dec001
Phosphorus, total [as P]monthly average≤ 1.2 mg/Lall year001
Phosphorus, total [as P]monthly average≤ 6 lb/dall year001
Coliform, fecal - % samples exceeding limitmaximum≤ 10 %May–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 generalgeometric mean≤ 200 #/100mLMay–Oct001
Coliform, fecal generaldaily maximumreport only (#/100mL)May–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 125 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 200 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

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

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Your permit document is the final word. As JSON: /api/v1/permits/IL0020974 · MCP: https://passage-data.com/mcp