MOUNT VERNON, CITY OF

NPDES permit IL0027341 · 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

0values over a limit
0required values missing, on 0 form(s)
8of 48 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 25 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (191)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]MO AV MN report only all year
001Oxygen, dissolved [DO]MN WK AV report only all year
001Oxygen, dissolved [DO]DAILY MN report only all year
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedWKLY AVG <= 45 mg/L all year
001Nitrogen, ammonia total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]DAILY MX report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]DAILY MX report only all year
001Chlorine, total residualMO AVG <= .038 mg/L all year
001Coliform, fecal generalDAILY MX <= 400 #/100mL all year
001Flow, totalMO TOTAL report only all year
A01BOD, 5-day, 20 deg. CDAILY MX report only all year
A01Solids, total suspendedDAILY MX report only all year
A01Nitrogen, ammonia total [as N]DAILY MX report only all year
A01Phosphorus, total [as P]MO AVG report only all year
A01Phosphorus, total [as P]DAILY MX report only all year
A01Flow, totalMO TOTAL report only all year
B01Oxygen, dissolved [DO]MO AV MN >= 5.5 mg/L Jan, Feb, Aug, Sep, Oct, Nov, Dec
B01Oxygen, dissolved [DO]MN WK AV >= 6 mg/L Mar, Apr, May, Jun, Jul
B01Oxygen, dissolved [DO]MN WK AV >= 4 mg/L Jan, Feb, Aug, Sep, Oct, Nov, Dec
B01Oxygen, dissolved [DO]DAILY MN >= 5 mg/L Mar, Apr, May, Jun, Jul
B01Oxygen, dissolved [DO]DAILY MN >= 3.5 mg/L Jan, Feb, Aug, Sep, Oct, Nov, Dec
B01pHMINIMUM >= 6 SU all year
B01pHMAXIMUM <= 9 SU all year
B01Solids, total suspendedMO AVG <= 12 mg/L all year
B01Solids, total suspendedDAILY MX <= 24 mg/L all year
B01Solids, total suspendedMO AVG <= 951 lb/d all year
B01Solids, total suspendedDAILY MX <= 1902 lb/d all year
B01Oil & GreaseDAILY MX report only all year
B01Oil & GreaseDAILY MX report only all year
B01Nitrogen, total [as N]MO AVG report only all year
B01Nitrogen, total [as N]DAILY MX report only all year
B01Nitrogen, ammonia total [as N]MO AVG <= 3.6 mg/L Jan
B01Nitrogen, ammonia total [as N]MO AVG <= 3.6 mg/L Feb
B01Nitrogen, ammonia total [as N]MO AVG <= 3.6 mg/L Nov
B01Nitrogen, ammonia total [as N]MO AVG <= 3.6 mg/L Dec
B01Nitrogen, ammonia total [as N]MO AVG <= 3.2 mg/L Mar
B01Nitrogen, ammonia total [as N]MO AVG <= 1.5 mg/L Apr
B01Nitrogen, ammonia total [as N]MO AVG <= 1.5 mg/L May
B01Nitrogen, ammonia total [as N]MO AVG <= 1.5 mg/L Jun
B01Nitrogen, ammonia total [as N]MO AVG <= 1.5 mg/L Jul
B01Nitrogen, ammonia total [as N]MO AVG <= 1.5 mg/L Aug
B01Nitrogen, ammonia total [as N]MO AVG <= 1.5 mg/L Sep
B01Nitrogen, ammonia total [as N]MO AVG <= 1.5 mg/L Oct
B01Nitrogen, ammonia total [as N]DAILY MX <= 8 mg/L Jan
B01Nitrogen, ammonia total [as N]DAILY MX <= 8 mg/L Feb
B01Nitrogen, ammonia total [as N]DAILY MX <= 8 mg/L Nov
B01Nitrogen, ammonia total [as N]DAILY MX <= 8 mg/L Dec
B01Nitrogen, ammonia total [as N]DAILY MX <= 8 mg/L Mar
B01Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L Apr
B01Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L May
B01Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L Jun
B01Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L Jul
B01Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L Aug
B01Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L Sep
B01Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L Oct
B01Nitrogen, ammonia total [as N]MO AVG <= 285 lb/d Jan
B01Nitrogen, ammonia total [as N]MO AVG <= 285 lb/d Feb
B01Nitrogen, ammonia total [as N]MO AVG <= 285 lb/d Nov
B01Nitrogen, ammonia total [as N]MO AVG <= 285 lb/d Dec
B01Nitrogen, ammonia total [as N]MO AVG <= 254 lb/d Mar
B01Nitrogen, ammonia total [as N]MO AVG <= 119 lb/d Apr
B01Nitrogen, ammonia total [as N]MO AVG <= 119 lb/d May
B01Nitrogen, ammonia total [as N]MO AVG <= 119 lb/d Jun
B01Nitrogen, ammonia total [as N]MO AVG <= 119 lb/d Jul
B01Nitrogen, ammonia total [as N]MO AVG <= 119 lb/d Aug
B01Nitrogen, ammonia total [as N]MO AVG <= 119 lb/d Sep
B01Nitrogen, ammonia total [as N]MO AVG <= 119 lb/d Oct
B01Nitrogen, ammonia total [as N]DAILY MX <= 634 lb/d Jan
B01Nitrogen, ammonia total [as N]DAILY MX <= 634 lb/d Feb
B01Nitrogen, ammonia total [as N]DAILY MX <= 634 lb/d Nov
B01Nitrogen, ammonia total [as N]DAILY MX <= 634 lb/d Dec
B01Nitrogen, ammonia total [as N]DAILY MX <= 634 lb/d Mar
B01Nitrogen, ammonia total [as N]DAILY MX <= 238 lb/d Apr
B01Nitrogen, ammonia total [as N]DAILY MX <= 238 lb/d May
B01Nitrogen, ammonia total [as N]DAILY MX <= 238 lb/d Jun
B01Nitrogen, ammonia total [as N]DAILY MX <= 238 lb/d Jul
B01Nitrogen, ammonia total [as N]DAILY MX <= 238 lb/d Aug
B01Nitrogen, ammonia total [as N]DAILY MX <= 238 lb/d Sep
B01Nitrogen, ammonia total [as N]DAILY MX <= 238 lb/d Oct
B01Phosphorus, total [as P]MO AVG <= 1 mg/L all year
B01Phosphorus, total [as P]MO AVG <= 41.7 lb/d all year
B01Cyanide, total [as CN]DAILY MX report only all year
B01Cyanide, total [as CN]DAILY MX report only all year
B01Cyanide, free [amenable to chlorination]DAILY MX report only all year
B01Cyanide, free [amenable to chlorination]DAILY MX report only all year
B01Chloride [as Cl]DAILY MX report only all year
B01Fluoride, total [as F]DAILY MX report only all year
B01Fluoride, total [as F]DAILY MX report only all year
B01Arsenic, total [as As]DAILY MX report only all year
B01Arsenic, total [as As]DAILY MX report only all year
B01Barium, total [as Ba]DAILY MX report only all year
B01Barium, total [as Ba]DAILY MX report only all year
B01Beryllium, total [as Be]DAILY MX report only all year
B01Beryllium, total [as Be]DAILY MX report only all year
B01Cadmium, total [as Cd]DAILY MX report only all year
B01Cadmium, total [as Cd]DAILY MX report only all year
B01Chromium, hexavalent [as Cr]DAILY MX report only all year
B01Chromium, hexavalent [as Cr]DAILY MX report only all year
B01Chromium, total [as Cr]DAILY MX report only all year
B01Chromium, total [as Cr]DAILY MX report only all year
B01Copper, total [as Cu]DAILY MX report only all year
B01Copper, total [as Cu]DAILY MX report only all year
B01Iron, total [as Fe]DAILY MX report only all year
B01Iron, total [as Fe]DAILY MX report only all year
B01Iron, dissolved [as Fe]DAILY MX report only all year
B01Iron, dissolved [as Fe]DAILY MX report only all year
B01Lead, total [as Pb]DAILY MX report only all year
B01Lead, total [as Pb]DAILY MX report only all year
B01Manganese, total [as Mn]DAILY MX report only all year
B01Manganese, total [as Mn]DAILY MX report only all year
B01Thallium, total [as Tl]DAILY MX report only all year
B01Thallium, total [as Tl]DAILY MX report only all year
B01Nickel, total [as Ni]DAILY MX report only all year
B01Nickel, total [as Ni]DAILY MX report only all year
B01Silver, total [as Ag]DAILY MX report only all year
B01Silver, total [as Ag]DAILY MX report only all year
B01Zinc, total [as Zn]DAILY MX report only all year
B01Zinc, total [as Zn]DAILY MX report only all year
B01Antimony, total [as Sb]DAILY MX report only all year
B01Antimony, total [as Sb]DAILY MX report only all year
B01Selenium, total [as Se]DAILY MX report only all year
B01Selenium, total [as Se]DAILY MX report only all year
B01Phenolics, total recoverableDAILY MX report only all year
B01Phenolics, total recoverableDAILY MX report only all year
B01Flow, in conduit or thru treatment plantMO AVG report only all year
B01Flow, in conduit or thru treatment plantDAILY MX report only all year
B01Chlorine, total residualDAILY MX <= .038 mg/L Jan, Feb, Mar, Apr, Nov, Dec
B01Chlorine, total residualDAILY MX <= .038 mg/L May, Jun, Jul, Aug, Sep, Oct
B01Mercury, total [as Hg]DAILY MX report only all year
B01Mercury, total [as Hg]DAILY MX report only all year
B01Coliform, fecal generalDAILY MX <= 400 #/100mL May, Jun, Jul, Aug, Sep, Oct
B01BOD, carbonaceous [5 day, 20 C]MO AVG <= 10 mg/L all year
B01BOD, carbonaceous [5 day, 20 C]DAILY MX <= 20 mg/L all year
B01BOD, carbonaceous [5 day, 20 C]MO AVG <= 792 lb/d all year
B01BOD, carbonaceous [5 day, 20 C]DAILY MX <= 1585 lb/d all year
INFBOD, 5-day, 20 deg. CMO AVG report only all year
INFSolids, total suspendedMO AVG 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
INFLOil & GreaseDAILY MX report only all year
INFLCyanide, total [as CN]DAILY 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
INFLCyanide, free [amenable to chlorination]DAILY MX report only all year
INFLFluoride, total [as F]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
INFLArsenic, total [as As]DAILY MX report only all year
INFLBarium, total [as Ba]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
INFLBeryllium, total [as Be]DAILY MX report only all year
INFLCadmium, total [as Cd]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, hexavalent [as Cr]DAILY MX report only all year
INFLChromium, total [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
INFLCopper, total [as Cu]DAILY MX report only all year
INFLIron, total [as Fe]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
INFLIron, dissolved [as Fe]DAILY MX report only all year
INFLLead, total [as Pb]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
INFLManganese, total [as Mn]DAILY MX report only all year
INFLThallium, total [as Tl]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
INFLNickel, total [as Ni]DAILY MX report only all year
INFLSilver, total [as Ag]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
INFLZinc, total [as Zn]DAILY MX report only all year
INFLAntimony, total [as Sb]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
INFLSelenium, total [as Se]DAILY MX report only all year
INFLPhenolics, total recoverableDAILY MX report only all year
INFLPhenolics, total recoverableDAILY MX report only all year
INFLMercury, total [as Hg]DAILY MX report only all year
INFLMercury, total [as Hg]DAILY MX report only all year

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