SANITARY DISTRICT OF DECATUR

NPDES permit IL0028321 · Major POTW · effective, expires 2026-09-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

EPA's record, 2025-09-01 to 2026-08-31

1values over a limit
0required values missing, on 0 form(s)
0of 158 forms filed late

Last period with anything received: 2026-08-31. Most often over: Coliform, fecal general (1).

Reporting

Reports are due about 25 days after each monitoring period ends (the most common figure among IL permits in EPA's filings — check your permit).

Limits in force (173)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]MO AV MN >= 6 mg/L Jan, Feb, Aug, Sep, Oct, Nov, Dec
001Oxygen, dissolved [DO]MN WK AV >= 6.25 mg/L Mar, Apr, May, Jun, Jul
001Oxygen, dissolved [DO]MN WK AV >= 4.5 mg/L Jan, Feb, Aug, Sep, Oct, Nov, Dec
001Oxygen, dissolved [DO]DAILY MN >= 5 mg/L Mar, Apr, May, Jun, Jul
001Oxygen, dissolved [DO]DAILY MN >= 4 mg/L Jan, Feb, Aug, Sep, Oct, Nov, Dec
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG <= 25 mg/L all year
001Solids, total suspendedWKLY AVG <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 26063 lb/d all year
001Solids, total suspendedWKLY AVG <= 46913 lb/d all year
001Oil & GreaseDAILY MX report only all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]MO AVG <= 1.5 mg/L Jan
001Nitrogen, ammonia total [as N]MO AVG <= 1.5 mg/L Apr
001Nitrogen, ammonia total [as N]MO AVG <= 1.5 mg/L May
001Nitrogen, ammonia total [as N]MO AVG <= 1.1 mg/L Jun
001Nitrogen, ammonia total [as N]MO AVG <= 1.1 mg/L Aug
001Nitrogen, ammonia total [as N]MO AVG <= 1.5 mg/L Dec
001Nitrogen, ammonia total [as N]MO AVG <= 1.5 mg/L Sep
001Nitrogen, ammonia total [as N]MO AVG <= 1.5 mg/L Feb
001Nitrogen, ammonia total [as N]MO AVG <= 1.1 mg/L Jul
001Nitrogen, ammonia total [as N]MO AVG <= 1.5 mg/L Mar
001Nitrogen, ammonia total [as N]MO AVG <= 1.5 mg/L Oct
001Nitrogen, ammonia total [as N]MO AVG <= 1.5 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L Nov
001Nitrogen, ammonia total [as N]MO AVG <= 1564 lb/d Jan
001Nitrogen, ammonia total [as N]MO AVG <= 1564 lb/d Apr
001Nitrogen, ammonia total [as N]MO AVG <= 1564 lb/d May
001Nitrogen, ammonia total [as N]MO AVG <= 1147 lb/d Jun
001Nitrogen, ammonia total [as N]MO AVG <= 1147 lb/d Aug
001Nitrogen, ammonia total [as N]MO AVG <= 1564 lb/d Dec
001Nitrogen, ammonia total [as N]MO AVG <= 1564 lb/d Sep
001Nitrogen, ammonia total [as N]MO AVG <= 1564 lb/d Feb
001Nitrogen, ammonia total [as N]MO AVG <= 1147 lb/d Jul
001Nitrogen, ammonia total [as N]MO AVG <= 1564 lb/d Mar
001Nitrogen, ammonia total [as N]MO AVG <= 1564 lb/d Oct
001Nitrogen, ammonia total [as N]MO AVG <= 1564 lb/d Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 3128 lb/d Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 3128 lb/d Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 3128 lb/d May
001Nitrogen, ammonia total [as N]DAILY MX <= 3128 lb/d Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 3128 lb/d Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 3128 lb/d Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 3128 lb/d Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 3128 lb/d Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 3128 lb/d Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 3128 lb/d Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 3128 lb/d Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 3128 lb/d Nov
001Nitrogen, ammonia total [as N]WKLY AVG <= 2.8 mg/L Jun, Jul, Aug
001Nitrogen, ammonia total [as N]WKLY AVG <= 2919 lb/d Jun, Jul, Aug
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]DAILY MX report only all year
001Cyanide, total [as CN]DAILY MX report only all year
001Cyanide, free [amenable to chlorination]DAILY MX report only all year
001Chloride [as Cl]DAILY MX report only all year
001Sulfate, total [as SO4]DAILY MX report only all year
001Fluoride, total [as F]DAILY MX report only all year
001Arsenic, total [as As]DAILY MX report only all year
001Barium, total [as Ba]DAILY MX report only all year
001Beryllium, total [as Be]DAILY MX report only all year
001Cadmium, total [as Cd]DAILY MX report only all year
001Chromium, hexavalent [as Cr]DAILY MX report only all year
001Chromium, total [as Cr]DAILY MX report only all year
001Copper, total [as Cu]DAILY MX report only all year
001Iron, total [as Fe]DAILY MX report only all year
001Iron, dissolved [as Fe]DAILY MX report only all year
001Lead, total [as Pb]DAILY MX report only all year
001Manganese, total [as Mn]DAILY MX report only all year
001Thallium, total [as Tl]DAILY MX report only all year
001Nickel, total [as Ni]MO AVG <= .0381 mg/L all year
001Nickel, total [as Ni]DAILY MX report only all year
001Nickel, total [as Ni]MO AVG <= 40 lb/d all year
001Silver, total [as Ag]DAILY MX report only all year
001Zinc, total [as Zn]DAILY MX report only all year
001Antimony, total [as Sb]DAILY MX report only all year
001Selenium, total [as Se]DAILY MX report only all year
001Phenolics, total recoverableDAILY MX report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualDAILY MX <= .05 mg/L May, Jun, Jul, Aug, Sep, Oct
001Chlorine, total residualDAILY MX <= .05 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Mercury, total [as Hg]DAILY MX report only all year
001Coliform, fecal generalDAILY MX <= 400 #/100mL May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 20 mg/L all year
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 40 mg/L all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 20850 lb/d all year
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 41700 lb/d all year
002BOD, 5-day, 20 deg. CDAILY MX report only all year
002Solids, total suspendedDAILY MX report only all year
002Coliform, fecal generalDAILY MX report only all year
002FlowMO TOTAL report only all year
003BOD, 5-day, 20 deg. CDAILY MX report only all year
003pHMINIMUM report only all year
003pHMAXIMUM report only all year
003Solids, total suspendedDAILY MX report only all year
003Nitrogen, ammonia total [as N]DAILY MX report only all year
003Phosphorus, total [as P]MO AVG report only all year
003Phosphorus, total [as P]DAILY MX report only all year
003Flow, totalMO TOTAL report only all year
004BOD, 5-day, 20 deg. CDAILY MX report only all year
004pHMINIMUM report only all year
004pHMAXIMUM report only all year
004Solids, total suspendedDAILY MX report only all year
004Nitrogen, ammonia total [as N]DAILY MX report only all year
004Phosphorus, total [as P]MO AVG report only all year
004Phosphorus, total [as P]DAILY MX report only all year
004Flow, totalMO TOTAL report only all year
007BOD, 5-day, 20 deg. CDAILY MX report only all year
007pHMINIMUM report only all year
007pHMAXIMUM report only all year
007Solids, total suspendedDAILY MX report only all year
007Nitrogen, ammonia total [as N]DAILY MX report only all year
007Phosphorus, total [as P]MO AVG report only all year
007Phosphorus, total [as P]DAILY MX report only all year
007Flow, totalMO TOTAL report only all year
008BOD, 5-day, 20 deg. CDAILY MX report only all year
008pHMINIMUM report only all year
008pHMAXIMUM report only all year
008Solids, total suspendedDAILY MX report only all year
008Nitrogen, ammonia total [as N]DAILY MX report only all year
008Phosphorus, total [as P]MO AVG report only all year
008Phosphorus, total [as P]DAILY MX report only all year
008Flow, totalMO TOTAL report only all year
A03OverflowsMO TOTAL report only all year
A04OverflowsMO TOTAL report only all year
A06OverflowsMO TOTAL report only all year
A07OverflowsMO TOTAL report only all year
A08OverflowsMO TOTAL report only all year
INFBOD, 5-day, 20 deg. CMO AVG report only all year
INFSolids, total suspendedMO AVG report only all year
INFPhosphorus, total [as P]MO AVG report only all year
INFPhosphorus, total [as P]DAILY MX report only all year
INFFlow, in conduit or thru treatment plantMO AVG report only all year
INFFlow, in conduit or thru treatment plantDAILY MX report only all year
INFFlow, in conduit or thru treatment plantMO AVG report only all year
INFFlow, in conduit or thru treatment plantDAILY MX report only all year
INFLOil & GreaseDAILY MX report only all year
INFLCyanide, total [as CN]DAILY MX report only all year
INFLCyanide, free [amenable to chlorination]DAILY MX report only all year
INFLFluoride, total [as F]DAILY MX report only all year
INFLArsenic, total [as As]DAILY MX report only all year
INFLBarium, total [as Ba]DAILY MX report only all year
INFLBeryllium, total [as Be]DAILY MX report only all year
INFLCadmium, total [as Cd]DAILY MX report only all year
INFLChromium, hexavalent [as Cr]DAILY MX report only all year
INFLChromium, total [as Cr]DAILY MX report only all year
INFLCopper, total [as Cu]DAILY MX report only all year
INFLIron, total [as Fe]DAILY MX report only all year
INFLIron, dissolved [as Fe]DAILY MX report only all year
INFLLead, total [as Pb]DAILY MX report only all year
INFLManganese, total [as Mn]DAILY MX report only all year
INFLThallium, total [as Tl]DAILY MX report only all year
INFLNickel, total [as Ni]DAILY MX report only all year
INFLSilver, total [as Ag]DAILY MX report only all year
INFLZinc, total [as Zn]DAILY MX report only all year
INFLAntimony, total [as Sb]DAILY MX report only all year
INFLSelenium, total [as Se]DAILY MX report only all year
INFLPhenolics, total recoverableDAILY MX report only all year
INFLMercury, total [as Hg]DAILY MX report only all year

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