DUPAGE COUNTY PUBLIC WORKS

NPDES permit IL0065188 · Major POTW · administratively continued, expires 2026-03-31 · 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.

This permit expired on 2026-03-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

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

2values over a limit
0required values missing, on 0 form(s)
0of 50 forms filed late

Last period with anything received: 2026-08-31. Most often over: Phosphorus, total [as P] (1), 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 (114)

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 <= .75 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
B01Temperature, water deg. fahrenheitMO MAX report only all year
B01Specific conductanceDAILY MX 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
B01Alkalinity, total [as CaCO3]DAILY MX report only all year
B01Solids, total suspendedMO AVG <= 25 mg/L all year
B01Solids, total suspendedWKLY AVG <= 45 mg/L all year
B01Solids, total suspendedMO AVG <= 5630 lb/d all year
B01Solids, total suspendedWKLY AVG <= 10133 lb/d all year
B01Oil & GreaseDAILY MX report only all year
B01Oil & GreaseDAILY MX report only all year
B01Nitrogen, total [as N]DAILY MX report only all year
B01Nitrogen, ammonia total [as N]MO AVG <= 1.6 mg/L Mar
B01Nitrogen, ammonia total [as N]MO AVG <= 1.5 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
B01Nitrogen, ammonia total [as N]MO AVG <= 4 mg/L Jan, Feb, Nov, Dec
B01Nitrogen, ammonia total [as N]DAILY MX <= 6.4 mg/L Mar
B01Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
B01Nitrogen, ammonia total [as N]DAILY MX <= 6.6 mg/L Jan, Feb, Nov, Dec
B01Nitrogen, ammonia total [as N]MO AVG <= 360 lb/d Mar
B01Nitrogen, ammonia total [as N]MO AVG <= 338 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
B01Nitrogen, ammonia total [as N]MO AVG <= 901 lb/d Jan, Feb, Nov, Dec
B01Nitrogen, ammonia total [as N]DAILY MX <= 1441 lb/d Mar
B01Nitrogen, ammonia total [as N]DAILY MX <= 676 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
B01Nitrogen, ammonia total [as N]DAILY MX <= 1486 lb/d Jan, Feb, Nov, Dec
B01Nitrogen, ammonia total [as N]WKLY AVG <= 4 mg/L Mar
B01Nitrogen, ammonia total [as N]WKLY AVG <= 901 lb/d Mar
B01Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
B01Nitrite + Nitrate total [as N]DAILY MX report only all year
B01Phosphorus, total [as P]MO AVG <= 1 mg/L all year
B01Phosphorus, total [as P]DAILY MX report only all year
B01Phosphorus, total [as P]MO AVG <= 225 lb/d all year
B01Phosphorus, total [as P]DAILY MX report only all year
B01Phosphorus, dissolvedDAILY MX report only 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 <= 500 mg/L all year
B01Chloride [as Cl]DAILY MX <= 104250 lb/d 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
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
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
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 May, Jun, Jul, Aug, Sep, Oct
B01Chlorine, total residualDAILY MX <= .038 mg/L Jan, Feb, Mar, Apr, Nov, Dec
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 <= 20 mg/L all year
B01BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 40 mg/L all year
B01BOD, carbonaceous [5 day, 20 C]MO AVG <= 4504 lb/d all year
B01BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 9007 lb/d 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]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

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states