CATERPILLAR INC.

NPDES permit IL0002291 · Major NON-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

1values over a limit
0required values missing, on 0 form(s)
0of 70 forms filed late

Last period with anything received: 2026-07-31. Most often over: Solids, total suspended (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 (154)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitMO MAX <= 90 deg F Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
001Temperature, water deg. fahrenheitMO MAX <= 75 deg F Jan, Feb, Mar, Dec
001BOD, 5-day, 20 deg. CDAILY MX report only 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
001Solids, total suspended30DA AVG <= 194 lb/d all year
001Solids, total suspendedDAILY MX <= 383 lb/d all year
001Oil & Grease30DA AVG <= 15 mg/L all year
001Oil & GreaseDAILY MX <= 30 mg/L all year
001Oil & Grease30DA AVG <= 104 lb/d all year
001Oil & GreaseDAILY MX <= 209 lb/d all year
001Cyanide, total [as CN]30DA AVG <= .1 mg/L all year
001Cyanide, total [as CN]DAILY MX <= .2 mg/L all year
001Cyanide, total [as CN]30DA AVG <= 1.7 lb/d all year
001Cyanide, total [as CN]DAILY MX <= 3.1 lb/d all year
001Cadmium, total [as Cd]30DA AVG <= .15 mg/L all year
001Cadmium, total [as Cd]DAILY MX <= .3 mg/L all year
001Cadmium, total [as Cd]30DA AVG <= .67 lb/d all year
001Cadmium, total [as Cd]DAILY MX <= 1.8 lb/d all year
001Chromium, total [as Cr]30DA AVG <= 1 mg/L all year
001Chromium, total [as Cr]DAILY MX <= 2 mg/L all year
001Chromium, total [as Cr]30DA AVG <= 4.3 lb/d all year
001Chromium, total [as Cr]DAILY MX <= 7.2 lb/d all year
001Copper, total [as Cu]DAILY MX <= .1347 mg/L all year
001Copper, total [as Cu]DAILY MX <= 8.7 lb/d all year
001Iron, total [as Fe]QB report only all year
001Iron, total [as Fe]QB report only all year
001Lead, total [as Pb]30DA AVG <= .2 mg/L all year
001Lead, total [as Pb]DAILY MX <= .4 mg/L all year
001Lead, total [as Pb]30DA AVG <= 1.1 lb/d all year
001Lead, total [as Pb]DAILY MX <= 1.8 lb/d all year
001Manganese, total [as Mn]QB report only all year
001Manganese, total [as Mn]QB report only all year
001Nickel, total [as Ni]30DA AVG <= 1 mg/L all year
001Nickel, total [as Ni]DAILY MX <= 2 mg/L all year
001Nickel, total [as Ni]30DA AVG <= 6.2 lb/d all year
001Nickel, total [as Ni]DAILY MX <= 10.3 lb/d all year
001Silver, total [as Ag]30DA AVG <= .1 mg/L all year
001Silver, total [as Ag]DAILY MX <= .2 mg/L all year
001Silver, total [as Ag]30DA AVG <= .62 lb/d all year
001Silver, total [as Ag]DAILY MX <= 1.1 lb/d all year
001Zinc, total [as Zn]QRTR AVG <= 1 mg/L all year
001Zinc, total [as Zn]QRTR AVG <= 1 mg/L all year
001Zinc, total [as Zn]QB <= 2 mg/L all year
001Zinc, total [as Zn]QB <= 2 mg/L all year
001Zinc, total [as Zn]QRTR AVG <= 3.8 lb/d all year
001Zinc, total [as Zn]QRTR AVG <= 3.8 lb/d all year
001Zinc, total [as Zn]QB <= 6.7 lb/d all year
001Zinc, total [as Zn]QB <= 6.7 lb/d all year
001PhenolsQB report only all year
001PhenolsQB 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 all year
001Total toxic organics [TTO] [40 CFR433]QB <= 1.56 mg/L all year
001Total toxic organics [TTO] [40 CFR433]QB <= 1.56 mg/L all year
001Total toxic organics [TTO] [40 CFR433]QB <= 5.5 lb/d all year
001Total toxic organics [TTO] [40 CFR433]QB <= 5.5 lb/d all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
003Flow, in conduit or thru treatment plantMO AVG report only all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
004Temperature, water deg. fahrenheitMO MAX <= 90 deg F Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
004Temperature, water deg. fahrenheitMO MAX <= 75 deg F Jan, Feb, Mar, Sep, Dec
004BOD, 5-day, 20 deg. CDAILY MX report only all year
004pHMO MIN >= 6 SU all year
004pHMO MAX <= 9 SU all year
004Solids, total suspended30DA AVG <= 15 mg/L all year
004Solids, total suspendedDAILY MX <= 30 mg/L all year
004Oil & Grease30DA AVG <= 15 mg/L all year
004Oil & GreaseDAILY MX <= 30 mg/L all year
004Cyanide, total [as CN]30DA AVG <= .1 mg/L all year
004Cyanide, total [as CN]DAILY MX <= .2 mg/L all year
004Cadmium, total [as Cd]30DA AVG <= .15 mg/L all year
004Cadmium, total [as Cd]DAILY MX <= .3 mg/L all year
004Chromium, total [as Cr]30DA AVG <= 1 mg/L all year
004Chromium, total [as Cr]DAILY MX <= 2 mg/L all year
004Copper, total [as Cu]DAILY MX <= .1347 mg/L all year
004Iron, total [as Fe]DAILY MX report only all year
004Lead, total [as Pb]30DA AVG <= .2 mg/L all year
004Lead, total [as Pb]DAILY MX <= .4 mg/L all year
004Manganese, total [as Mn]DAILY MX report only all year
004Nickel, total [as Ni]30DA AVG <= 1 mg/L all year
004Nickel, total [as Ni]DAILY MX <= 2 mg/L all year
004Silver, total [as Ag]30DA AVG <= .1 mg/L all year
004Silver, total [as Ag]DAILY MX <= .2 mg/L all year
004Zinc, total [as Zn]30DA AVG <= 1 mg/L all year
004Zinc, total [as Zn]DAILY MX <= 2 mg/L all year
004Flow, in conduit or thru treatment plantMO AVG report only all year
004Flow, in conduit or thru treatment plantDAILY MX report only all year
004Chlorine, total residualDAILY MX <= .05 mg/L all year
004Total toxic organics [TTO] [40 CFR433]DAILY MX <= 1.56 mg/L all year
005Temperature, water deg. fahrenheitMO MAX <= 93 deg F Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
005Temperature, water deg. fahrenheitMO MAX <= 63 deg F Jan, Feb, Mar, Sep, Dec
005BOD, 5-day, 20 deg. CDAILY MX report only all year
005pHMO MIN >= 6 SU all year
005pHMO MAX <= 9 SU all year
005Solids, total suspended30DA AVG <= 15 mg/L all year
005Solids, total suspendedDAILY MX <= 30 mg/L all year
005Oil & Grease30DA AVG <= 15 mg/L all year
005Oil & GreaseDAILY MX <= 30 mg/L all year
005Cyanide, total [as CN]30DA AVG <= .1 mg/L all year
005Cyanide, total [as CN]DAILY MX <= .2 mg/L all year
005Cadmium, total [as Cd]30DA AVG <= .15 mg/L all year
005Cadmium, total [as Cd]DAILY MX <= .3 mg/L all year
005Chromium, total [as Cr]30DA AVG <= 1 mg/L all year
005Chromium, total [as Cr]DAILY MX <= 2 mg/L all year
005Copper, total [as Cu]DAILY MX <= .1347 mg/L all year
005Iron, total [as Fe]DAILY MX report only all year
005Lead, total [as Pb]30DA AVG <= .2 mg/L all year
005Lead, total [as Pb]DAILY MX <= .4 mg/L all year
005Manganese, total [as Mn]DAILY MX report only all year
005Nickel, total [as Ni]30DA AVG <= 1 mg/L all year
005Nickel, total [as Ni]DAILY MX <= 2 mg/L all year
005Silver, total [as Ag]30DA AVG <= .1 mg/L all year
005Silver, total [as Ag]DAILY MX <= .2 mg/L all year
005Zinc, total [as Zn]30DA AVG <= 1 mg/L all year
005Zinc, total [as Zn]DAILY MX <= 2 mg/L all year
005Flow, in conduit or thru treatment plantMO AVG report only all year
005Flow, in conduit or thru treatment plantDAILY MX report only all year
005Chlorine, total residualDAILY MX <= .05 mg/L all year
005Total toxic organics [TTO] [40 CFR433]DAILY MX <= 1.56 mg/L all year
006Temperature, water deg. fahrenheitMO MAX <= 63 deg F Jan, Feb, Mar, Sep, Dec
006Temperature, water deg. fahrenheitMO MAX <= 93 deg F Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
006BOD, 5-day, 20 deg. CDAILY MX report only all year
006pHMO MIN >= 6 SU all year
006pHMO MAX <= 9 SU all year
006Solids, total suspended30DA AVG <= 15 mg/L all year
006Solids, total suspendedDAILY MX <= 30 mg/L all year
006Oil & Grease30DA AVG <= 15 mg/L all year
006Oil & GreaseDAILY MX <= 30 mg/L all year
006Cyanide, total [as CN]30DA AVG <= .1 mg/L all year
006Cyanide, total [as CN]DAILY MX <= .2 mg/L all year
006Cadmium, total [as Cd]30DA AVG <= .15 mg/L all year
006Cadmium, total [as Cd]DAILY MX <= .3 mg/L all year
006Chromium, total [as Cr]30DA AVG <= 1 mg/L all year
006Chromium, total [as Cr]DAILY MX <= 2 mg/L all year
006Copper, total [as Cu]DAILY MX <= .1347 mg/L all year
006Iron, total [as Fe]DAILY MX report only all year
006Lead, total [as Pb]30DA AVG <= .2 mg/L all year
006Lead, total [as Pb]DAILY MX <= .4 mg/L all year
006Manganese, total [as Mn]DAILY MX report only all year
006Nickel, total [as Ni]30DA AVG <= 1 mg/L all year
006Nickel, total [as Ni]DAILY MX <= 2 mg/L all year
006Silver, total [as Ag]30DA AVG <= .1 mg/L all year
006Silver, total [as Ag]DAILY MX <= .2 mg/L all year
006Zinc, total [as Zn]30DA AVG <= 1 mg/L all year
006Zinc, total [as Zn]DAILY MX <= 2 mg/L all year
006Flow, in conduit or thru treatment plantMO AVG report only all year
006Flow, in conduit or thru treatment plantDAILY MX report only all year
006Chlorine, total residualDAILY MX <= .05 mg/L all year
006Total toxic organics [TTO] [40 CFR433]DAILY MX <= 1.56 mg/L 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