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Carbon Hill, Village of

Sewage treatment plant, Carbon Hill, Illinois. NPDES permit IL0080088, in force until Aug 31, 2031. Last 12 months: over a limit 30 times (last March 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
August 2026
Oct 2024 – Sep 2025
109 values over a limit, 0 required values missing, 0 of 24 reports late

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

All 30 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, carbonaceous [5 day, 20 C], daily maximum20.3 mg/L≤ 20 mg/L2%
October 2025BOD, carbonaceous [5 day, 20 C], monthly average20.3 mg/L≤ 10 mg/L103%
October 2025Nitrogen, ammonia total [as N], daily maximum101 mg/L≤ 3.5 mg/L2786%
October 2025Nitrogen, ammonia total [as N], daily maximum19 lb/d≤ 1.5 lb/d1167%
October 2025Nitrogen, ammonia total [as N], monthly average101 mg/L≤ 1.2 mg/L8317%
October 2025Nitrogen, ammonia total [as N], monthly average14 lb/d≤ .5 lb/d2700%
October 2025Nitrogen, ammonia total [as N], weekly average101 mg/L≤ 3 mg/L3267%
October 2025Nitrogen, ammonia total [as N], weekly average14 lb/d≤ 1.3 lb/d977%
October 2025Oxygen, dissolved [DO], daily minimum.2 mg/L≥ 3.5 mg/L94%
October 2025Oxygen, dissolved [DO], minimum weekly average.2 mg/L≥ 4 mg/L95%
October 2025Oxygen, dissolved [DO], monthly average minimum.2 mg/L≥ 5.5 mg/L96%
October 2025Solids, total suspended, daily maximum47.2 mg/L≤ 24 mg/L97%
October 2025Solids, total suspended, monthly average47.2 mg/L≤ 12 mg/L293%
October 2025Solids, total suspended, monthly average6.7 lb/d≤ 5 lb/d34%
November 2025BOD, carbonaceous [5 day, 20 C], monthly average15.1 mg/L≤ 10 mg/L51%
November 2025Nitrogen, ammonia total [as N], daily maximum10.3 lb/d≤ 1.2 lb/d758%
November 2025Nitrogen, ammonia total [as N], daily maximum59 mg/L≤ 2.8 mg/L2007%
November 2025Nitrogen, ammonia total [as N], monthly average59 mg/L≤ 2.1 mg/L2710%
November 2025Nitrogen, ammonia total [as N], monthly average9.8 lb/d≤ .88 lb/d1014%
December 2025BOD, carbonaceous [5 day, 20 C], monthly average15.1 mg/L≤ 10 mg/L51%
January 2026Solids, total suspended, monthly average19.6 mg/L≤ 12 mg/L63%
February 2026Nitrogen, ammonia total [as N], daily maximum33 mg/L≤ 2.8 mg/L1079%
February 2026Nitrogen, ammonia total [as N], daily maximum5.7 lb/d≤ 1.2 lb/d375%
February 2026Nitrogen, ammonia total [as N], monthly average33 mg/L≤ 2.1 mg/L1471%
February 2026Nitrogen, ammonia total [as N], monthly average5.2 lb/d≤ .88 lb/d491%
March 2026Nitrogen, ammonia total [as N], daily maximum2.2 lb/d≤ 1.5 lb/d47%
March 2026Nitrogen, ammonia total [as N], daily maximum8.9 mg/L≤ 3.5 mg/L154%
March 2026Nitrogen, ammonia total [as N], monthly average1.3 lb/d≤ .5 lb/d160%
March 2026Nitrogen, ammonia total [as N], monthly average8.9 mg/L≤ 1.2 mg/L642%
March 2026Nitrogen, ammonia total [as N], weekly average8.9 mg/L≤ 3 mg/L197%

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≤ 12 mg/Lall year001
Solids, total suspendeddaily maximum≤ 24 mg/Lall year001
Solids, total suspendedmonthly average≤ 5 lb/dall year001
Solids, total suspendeddaily maximum≤ 10 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 1.2 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ .8 mg/LJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 2.1 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 3.5 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 2.9 mg/LJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 2.8 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ .5 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ .33 lb/dJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ .88 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 1.5 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 1.2 lb/dJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 1.2 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 2 mg/LJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ 3 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]weekly average≤ .83 lb/dJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ 1.3 lb/dMar, Apr, 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≤ 4.2 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 8.3 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.

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