DEERFIELD, VILLAGE OF

NPDES permit IL0028347 · Major POTW · administratively continued, expires 2025-05-31 · 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 2025-05-31 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

7values over a limit
0required values missing, on 0 form(s)
0of 86 forms filed late

Last period with anything received: 2026-08-31. Most often over: Solids, total suspended (4), Coliform, fecal general (2), Chlorine, total residual (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 (141)

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
002Oxygen, dissolved [DO]DAILY MN report only all year
002BOD, 5-day, 20 deg. CMO AVG report only all year
002pHMINIMUM >= 6 SU all year
002pHMAXIMUM <= 9 SU all year
002Solids, total suspendedMO AVG report only all year
002Nitrogen, ammonia total [as N]MO AVG report only all year
002Nitrogen, ammonia total [as N]DAILY MX report only all year
002Phosphorus, total [as P]MO AVG report only all year
002Phosphorus, total [as P]DAILY MX report only all year
002Chlorine, total residualMO AVG <= .75 mg/L all year
002Coliform, fecal generalDAILY MX <= 400 #/100mL all year
002Flow, totalMO TOTAL report only all year
004Oxygen, dissolved [DO]DAILY MN report only all year
004BOD, 5-day, 20 deg. CMO AVG report only all year
004pHMINIMUM >= 6 SU all year
004pHMAXIMUM <= 9 SU all year
004Solids, total suspendedMO AVG report only all year
004Nitrogen, ammonia total [as N]MO AVG 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
004Chlorine, total residualMO AVG <= .75 mg/L all year
004Coliform, fecal generalDAILY MX <= 400 #/100mL all year
004Flow, 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 <= 12 mg/L all year
B01Solids, total suspendedDAILY MX <= 24 mg/L all year
B01Solids, total suspendedMO AVG <= 801 lb/d all year
B01Solids, total suspendedDAILY MX <= 1601 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 <= 2.6 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 <= 8 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 <= 8 mg/L Jan, Feb, Nov, Dec
B01Nitrogen, ammonia total [as N]MO AVG <= 173 lb/d Mar
B01Nitrogen, ammonia total [as N]MO AVG <= 100 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
B01Nitrogen, ammonia total [as N]MO AVG <= 267 lb/d Jan, Feb, Nov, Dec
B01Nitrogen, ammonia total [as N]DAILY MX <= 534 lb/d Mar
B01Nitrogen, ammonia total [as N]DAILY MX <= 200 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
B01Nitrogen, ammonia total [as N]DAILY MX <= 534 lb/d Jan, Feb, Nov, Dec
B01Nitrogen, ammonia total [as N]WKLY AVG <= 5.3 mg/L Mar
B01Nitrogen, ammonia total [as N]WKLY AVG <= 354 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 <= 67 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 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
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 <= .05 mg/L all year
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 #/100L 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 <= 667 lb/d all year
B01BOD, carbonaceous [5 day, 20 C]DAILY MX <= 1334 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]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
INFLBOD, 5-day, 20 deg. CMO AVG report only all year
INFLSolids, total suspendedMO AVG report only all year
INFLFlow, in conduit or thru treatment plantMO AVG report only all year
INFLFlow, 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