CHICAGO DEPARTMENT OF AVIATION

NPDES permit IL0002283 · Minor NON-POTW · effective, expires 2031-07-31 · 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.

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

0values over a limit
0required values missing, on 0 form(s)
1of 33 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 (172)

OutfallParameterStatisticLimitMonths
001BOD, 5-day, 20 deg. C30DA AVG <= 10 mg/L all year
001BOD, 5-day, 20 deg. CDAILY MX <= 20 mg/L all year
001pHMO MIN >= 6 SU all year
001pHMO MAX <= 9 SU all year
001Solids, total suspended30DA AVG <= 15 mg/L all year
001Solids, total suspendedDAILY MX <= 30 mg/L all year
001Nitrogen, ammonia total [as N]30DA AVG <= 1.8 mg/L Mar, Apr, May, Sep, Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 1.6 mg/L Jun, Jul, Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 2.9 mg/L Jan, Feb, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 6.9 mg/L Mar, Apr, May, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 10.5 mg/L Jun, Jul, Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 3.2 mg/L Jan, Feb, Nov, Dec
001Nitrogen, ammonia total [as N]WKLY AVG <= 4 mg/L Jun, Jul, Aug
001Nitrogen, ammonia total [as N]WKLY AVG <= 4.5 mg/L Mar, Apr, May, Sep, Oct
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Perfluorooctanoic acid (PFOA)DAILY MX report only all year
001Perfluorobutanoic acid (PFBA)DAILY MX report only all year
001Perfluorooctanesulfonamide (PFOSA)DAILY MX report only all year
001Perfluoropentanoic acid (PFPeA)DAILY MX report only all year
001Perfluorohexanoic acid (PFHxA)DAILY MX report only all year
001Perfluoroheptanoic acid (PFHpA)DAILY MX report only all year
001Perfluorononanoic acid (PFNA)DAILY MX report only all year
001Perfluorodecanoic acid (PFDA)DAILY MX report only all year
001Perfluoroundecanoic acid (PFUnA)DAILY MX report only all year
001Perfluorododecanoic acid (PFDoA)DAILY MX report only all year
001Perfluorotridecanoic acid (PFTrDA)DAILY MX report only all year
001Perfluorotetradecanoic acid (PFTeDA)DAILY MX report only all year
001N-ethyl perfluorooctanesulfonamidoethanol (NEtFOSE)DAILY MX report only all year
001N-methyl perfluorooctanesulfonamidoethanol (NMeFOSE)DAILY MX report only all year
001N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)DAILY MX report only all year
001N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)DAILY MX report only all year
001Perfluorobutanesulfonic acid (PFBS)DAILY MX report only all year
001Perfluorodecanesulfonic acid (PFDS)DAILY MX report only all year
001Perfluoroheptanesulfonic acid (PFHpS)DAILY MX report only all year
001Perfluorohexanesulfonic acid (PFHxS)DAILY MX report only all year
001Perfluorooctanesulfonic acid (PFOS)DAILY MX report only all year
0011H,1H,2H,2H-Perfluorohexane sulfonic acid (4:2 FTS)DAILY MX report only all year
0011H,1H,2H,2H-Perfluorooctane sulfonic acid (6:2 FTS)DAILY MX report only all year
0011H,1H, 2H, 2H-Perfluorodecane sulfonic acid (8:2 FTS)DAILY MX report only all year
001Perfluoropentanesulfonic acid (PFPeS)DAILY MX report only all year
001Perfluorononanesulfonic acid (PFNS)DAILY MX report only all year
001Hexafluoropropylene oxide dimer acid (HFPO-DA)DAILY MX report only all year
001Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)DAILY MX report only all year
001Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA)DAILY MX report only all year
001Perfluorododecanesulfonic acid (PFDoS)DAILY MX report only all year
0014,8-Dioxa-3H-perfluorononanoic acid (ADONA)DAILY MX report only all year
001N-methyl perfluorooctanesulfonamide (NMeFOSA)DAILY MX report only all year
001N-ethyl perfluorooctanesulfonamide (NEtFOSA)DAILY MX report only all year
001PFAS SumDAILY MX report only all year
0013-Perfluoropropyl propanoic acid (3:3 FTCA)DAILY MX report only all year
001Perfluoro-3-methoxypropanoic acid (PFMPA)DAILY MX report only all year
0019-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS)DAILY MX report only all year
00111-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)DAILY MX report only all year
0013-Perfluoroheptyl propanoic acid (7:3 FTCA)DAILY MX report only all year
001Perfluoro-4-methoxybutanoic acid (PFMBA)DAILY MX report only all year
0012H,2H,3H,3H-Perfluorooctanoic acid (5:3 FTCA)DAILY MX report only all year
002Oxygen, dissolved [DO]MO AV MN >= 5.5 mg/L Jan, Feb, Aug, Sep, Oct, Nov, Dec
002Oxygen, dissolved [DO]MN WK AV >= 4 mg/L Jan, Feb, Aug, Sep, Oct, Nov, Dec
002Oxygen, dissolved [DO]MN WK AV >= 6 mg/L Mar, Apr, May, Jun, Jul
002Oxygen, dissolved [DO]DAILY MN >= 3.5 mg/L Jan, Feb, Aug, Sep, Oct, Nov, Dec
002Oxygen, dissolved [DO]DAILY MN >= 5.6 mg/L Mar, Apr, May, Jun, Jul
002BOD, 5-day, 20 deg. C30DA AVG <= 20 mg/L all year
002BOD, 5-day, 20 deg. CDAILY MX <= 40 mg/L all year
002pHMO MIN >= 6 SU all year
002pHMO MAX <= 9 SU all year
002Nitrogen, ammonia total [as N]30DA AVG <= 1.8 mg/L Mar, Apr, May, Sep, Oct
002Nitrogen, ammonia total [as N]30DA AVG <= 1.6 mg/L Jun, Jul, Aug
002Nitrogen, ammonia total [as N]30DA AVG <= 2.9 mg/L Jan, Feb, Nov, Dec
002Nitrogen, ammonia total [as N]DAILY MX <= 6.9 mg/L Mar, Apr, May, Sep, Oct
002Nitrogen, ammonia total [as N]DAILY MX <= 10.5 mg/L Jun, Jul, Aug
002Nitrogen, ammonia total [as N]DAILY MX <= 3.2 mg/L Jan, Feb, Nov, Dec
002Nitrogen, ammonia total [as N]WKLY AVG <= 4 mg/L Jun, Jul, Aug
002Nitrogen, ammonia total [as N]WKLY AVG <= 4.5 mg/L Mar, Apr, May, Sep, Oct
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Perfluorooctanoic acid (PFOA)DAILY MX report only all year
002Perfluorobutanoic acid (PFBA)DAILY MX report only all year
002Perfluorooctanesulfonamide (PFOSA)DAILY MX report only all year
002Perfluoropentanoic acid (PFPeA)DAILY MX report only all year
002Perfluorohexanoic acid (PFHxA)DAILY MX report only all year
002Perfluoroheptanoic acid (PFHpA)DAILY MX report only all year
002Perfluorononanoic acid (PFNA)DAILY MX report only all year
002Perfluorodecanoic acid (PFDA)DAILY MX report only all year
002Perfluoroundecanoic acid (PFUnA)DAILY MX report only all year
002Perfluorododecanoic acid (PFDoA)DAILY MX report only all year
002Perfluorotridecanoic acid (PFTrDA)DAILY MX report only all year
002Perfluorotetradecanoic acid (PFTeDA)DAILY MX report only all year
002N-ethyl perfluorooctanesulfonamidoethanol (NEtFOSE)DAILY MX report only all year
002N-methyl perfluorooctanesulfonamidoethanol (NMeFOSE)DAILY MX report only all year
002N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)DAILY MX report only all year
002N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)DAILY MX report only all year
002Perfluorobutanesulfonic acid (PFBS)DAILY MX report only all year
002Perfluorodecanesulfonic acid (PFDS)DAILY MX report only all year
002Perfluoroheptanesulfonic acid (PFHpS)DAILY MX report only all year
002Perfluorohexanesulfonic acid (PFHxS)DAILY MX report only all year
002Perfluorooctanesulfonic acid (PFOS)DAILY MX report only all year
0021H,1H,2H,2H-Perfluorohexane sulfonic acid (4:2 FTS)DAILY MX report only all year
0021H,1H,2H,2H-Perfluorooctane sulfonic acid (6:2 FTS)DAILY MX report only all year
0021H,1H, 2H, 2H-Perfluorodecane sulfonic acid (8:2 FTS)DAILY MX report only all year
002Perfluoropentanesulfonic acid (PFPeS)DAILY MX report only all year
002Perfluorononanesulfonic acid (PFNS)DAILY MX report only all year
002Hexafluoropropylene oxide dimer acid (HFPO-DA)DAILY MX report only all year
002Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)DAILY MX report only all year
002Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA)DAILY MX report only all year
002Perfluorododecanesulfonic acid (PFDoS)DAILY MX report only all year
0024,8-Dioxa-3H-perfluorononanoic acid (ADONA)DAILY MX report only all year
002N-methyl perfluorooctanesulfonamide (NMeFOSA)DAILY MX report only all year
002N-ethyl perfluorooctanesulfonamide (NEtFOSA)DAILY MX report only all year
002PFAS SumDAILY MX report only all year
0023-Perfluoropropyl propanoic acid (3:3 FTCA)DAILY MX report only all year
002Perfluoro-3-methoxypropanoic acid (PFMPA)DAILY MX report only all year
0029-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS)DAILY MX report only all year
00211-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)DAILY MX report only all year
0023-Perfluoroheptyl propanoic acid (7:3 FTCA)DAILY MX report only all year
002Perfluoro-4-methoxybutanoic acid (PFMBA)DAILY MX report only all year
0022H,2H,3H,3H-Perfluorooctanoic acid (5:3 FTCA)DAILY MX report only all year
097BOD, 5-day, 20 deg. C30DA AVG <= 20 mg/L all year
097BOD, 5-day, 20 deg. CDAILY MX <= 40 mg/L all year
097pHMO MIN >= 6 SU all year
097pHMO MAX <= 9 SU all year
097Nitrogen, ammonia total [as N]30DA AVG <= 1.8 mg/L Mar, Apr, May, Sep, Oct
097Nitrogen, ammonia total [as N]30DA AVG <= 1.6 mg/L Jun, Jul, Aug
097Nitrogen, ammonia total [as N]30DA AVG <= 2.9 mg/L Jan, Feb, Nov, Dec
097Nitrogen, ammonia total [as N]DAILY MX <= 6.9 mg/L Mar, Apr, May, Sep, Oct
097Nitrogen, ammonia total [as N]DAILY MX <= 10.5 mg/L Jun, Jul, Aug
097Nitrogen, ammonia total [as N]DAILY MX <= 3.2 mg/L Jan, Feb, Nov, Dec
097Nitrogen, ammonia total [as N]WKLY AVG <= 4 mg/L Jun, Jul, Aug
097Nitrogen, ammonia total [as N]WKLY AVG <= 4.5 mg/L Mar, Apr, May, Sep, Oct
097Flow, in conduit or thru treatment plantMO AVG report only all year
097Flow, in conduit or thru treatment plantDAILY MX report only all year
097Perfluorooctanoic acid (PFOA)DAILY MX report only all year
097Perfluorobutanoic acid (PFBA)DAILY MX report only all year
097Perfluorooctanesulfonamide (PFOSA)DAILY MX report only all year
097Perfluoropentanoic acid (PFPeA)DAILY MX report only all year
097Perfluorohexanoic acid (PFHxA)DAILY MX report only all year
097Perfluoroheptanoic acid (PFHpA)DAILY MX report only all year
097Perfluorononanoic acid (PFNA)DAILY MX report only all year
097Perfluorodecanoic acid (PFDA)DAILY MX report only all year
097Perfluoroundecanoic acid (PFUnA)DAILY MX report only all year
097Perfluorododecanoic acid (PFDoA)DAILY MX report only all year
097Perfluorotridecanoic acid (PFTrDA)DAILY MX report only all year
097Perfluorotetradecanoic acid (PFTeDA)DAILY MX report only all year
097N-ethyl perfluorooctanesulfonamidoethanol (NEtFOSE)DAILY MX report only all year
097N-methyl perfluorooctanesulfonamidoethanol (NMeFOSE)DAILY MX report only all year
097N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)DAILY MX report only all year
097N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)DAILY MX report only all year
097Perfluorobutanesulfonic acid (PFBS)DAILY MX report only all year
097Perfluorodecanesulfonic acid (PFDS)DAILY MX report only all year
097Perfluoroheptanesulfonic acid (PFHpS)DAILY MX report only all year
097Perfluorohexanesulfonic acid (PFHxS)DAILY MX report only all year
097Perfluorooctanesulfonic acid (PFOS)DAILY MX report only all year
0971H,1H,2H,2H-Perfluorohexane sulfonic acid (4:2 FTS)DAILY MX report only all year
0971H,1H,2H,2H-Perfluorooctane sulfonic acid (6:2 FTS)DAILY MX report only all year
0971H,1H, 2H, 2H-Perfluorodecane sulfonic acid (8:2 FTS)DAILY MX report only all year
097Perfluoropentanesulfonic acid (PFPeS)DAILY MX report only all year
097Perfluorononanesulfonic acid (PFNS)DAILY MX report only all year
097Hexafluoropropylene oxide dimer acid (HFPO-DA)DAILY MX report only all year
097Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)DAILY MX report only all year
097Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA)DAILY MX report only all year
097Perfluorododecanesulfonic acid (PFDoS)DAILY MX report only all year
0974,8-Dioxa-3H-perfluorononanoic acid (ADONA)DAILY MX report only all year
097N-methyl perfluorooctanesulfonamide (NMeFOSA)DAILY MX report only all year
097N-ethyl perfluorooctanesulfonamide (NEtFOSA)DAILY MX report only all year
097PFAS SumDAILY MX report only all year
0973-Perfluoropropyl propanoic acid (3:3 FTCA)DAILY MX report only all year
097Perfluoro-3-methoxypropanoic acid (PFMPA)DAILY MX report only all year
0979-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS)DAILY MX report only all year
09711-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)DAILY MX report only all year
0973-Perfluoroheptyl propanoic acid (7:3 FTCA)DAILY MX report only all year
097Perfluoro-4-methoxybutanoic acid (PFMBA)DAILY MX report only all year
0972H,2H,3H,3H-Perfluorooctanoic acid (5:3 FTCA)DAILY 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