Occidental Chemical Corporation

NPDES permit DE0050911 · Minor NON-POTW · expired, expires 2025-07-31 · 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.

This permit expired on 2025-07-31 and is expired: 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

3values over a limit
0required values missing, on 0 form(s)
0of 60 forms filed late

Last period with anything received: 2026-06-30. Most often over: BOD, 5-day, 20 deg. C (1), Copper, dissolved [as Cu] (1), Solids, total suspended (1).

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among DE permits in EPA's filings — check your permit).

Limits in force (89)

OutfallParameterStatisticLimitMonths
001BOD, 5-day, 20 deg. CDAILY AV report only all year
001BOD, 5-day, 20 deg. CDAILY MX <= 9 mg/L all year
001BOD, 5-day, 20 deg. CDAILY AV <= 15 lb/d all year
001BOD, 5-day, 20 deg. CDAILY MX <= 22.5 lb/d all year
001pHDAILY MN report only all year
001pHDAILY MX report only all year
001Solids, total suspendedDAILY AV <= 30 mg/L all year
001Solids, total suspendedDAILY MX <= 45 mg/L all year
001Solids, total suspendedDAILY AV <= 75 lb/d all year
001Solids, total suspendedDAILY MX <= 113 lb/d all year
001Chromium, total [as Cr]DAILY AV <= .15 mg/L all year
001Chromium, total [as Cr]DAILY MX <= .23 mg/L all year
001Chromium, total [as Cr]DAILY AV <= .38 lb/d all year
001Chromium, total [as Cr]DAILY MX <= .56 lb/d all year
001Copper, dissolved [as Cu]DAILY AV <= .5 mg/L all year
001Copper, dissolved [as Cu]DAILY MX <= .75 mg/L all year
001Copper, dissolved [as Cu]DAILY AV <= 1.25 lb/d all year
001Copper, dissolved [as Cu]DAILY MX <= 1.88 lb/d all year
001Iron, total [as Fe]DAILY AV <= 2 mg/L all year
001Iron, total [as Fe]DAILY MX <= 3 mg/L all year
001Iron, total [as Fe]DAILY AV <= 5 lb/d all year
001Iron, total [as Fe]DAILY MX <= 7.5 lb/d all year
001Lead, dissolved [as Pb]DAILY AV <= .15 mg/L all year
001Lead, dissolved [as Pb]DAILY MX <= .23 mg/L all year
001Lead, dissolved [as Pb]DAILY AV <= .38 lb/d all year
001Lead, dissolved [as Pb]DAILY MX <= .56 lb/d all year
001Enterococci: group D, MF trans, M-E, EIADAILY MX <= 104 CFU/100mL all year
001Flow, in conduit or thru treatment plantDAILY AV report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualDAILY MX <= 0 mg/L all year
001Mercury, dissolved [as Hg]DAILY AV <= .005 mg/L all year
001Mercury, dissolved [as Hg]DAILY MX <= .0075 mg/L all year
001Mercury, dissolved [as Hg]DAILY AV <= .0125 lb/d all year
001Mercury, dissolved [as Hg]DAILY MX <= .0188 lb/d all year
001pH range excursions, > 60 minutesMO MAX <= 0 occur/mo all year
001pH range excursions, monthly total accumMAXIMUM <= 446 min all year
002pHDAILY MN >= 6 SU all year
002pHDAILY MX <= 9 SU all year
002Copper, dissolved [as Cu]DAILY MX report only all year
002Copper, dissolved [as Cu]DAILY MX report only all year
002Lead, dissolved [as Pb]DAILY MX report only all year
002Lead, dissolved [as Pb]DAILY MX report only all year
002Nickel, dissolved [as Ni]DAILY MX report only all year
002Nickel, dissolved [as Ni]DAILY MX report only all year
002Zinc, dissolved [as Zn]DAILY MX report only all year
002Zinc, dissolved [as Zn]DAILY MX report only all year
002Enterococci: group D, MF trans, M-E, EIADAILY MX report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Mercury, dissolved [as Hg]DAILY MX report only all year
002Mercury, dissolved [as Hg]DAILY MX report only all year
003pHDAILY MN >= 6 SU all year
003pHDAILY MX <= 9 SU all year
003Nitrogen, total [as N]DAILY MX report only all year
003Nitrogen, total [as N]DAILY MX report only all year
003Copper, dissolved [as Cu]DAILY MX report only all year
003Copper, dissolved [as Cu]DAILY MX report only all year
003Enterococci: group D, MF trans, M-E, EIADAILY MX report only all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
003Mercury, dissolved [as Hg]DAILY MX report only all year
003Mercury, dissolved [as Hg]DAILY MX report only all year
004pHDAILY MN >= 6 SU all year
004pHDAILY MX <= 9 SU all year
004Nitrogen, total [as N]DAILY MX report only all year
004Nitrogen, total [as N]DAILY MX report only all year
004Flow, in conduit or thru treatment plantDAILY MX report only all year
004Mercury, dissolved [as Hg]DAILY MX report only all year
004Mercury, dissolved [as Hg]DAILY MX report only all year
005pHDAILY MN >= 6 SU all year
005pHDAILY MX <= 9 SU all year
005Nitrogen, total [as N]DAILY MX report only all year
005Nitrogen, total [as N]DAILY MX report only all year
005Copper, dissolved [as Cu]DAILY MX report only all year
005Copper, dissolved [as Cu]DAILY MX report only all year
005Iron, total [as Fe]DAILY MX report only all year
005Iron, total [as Fe]DAILY MX report only all year
005Aluminum, total [as Al]DAILY MX report only all year
005Aluminum, total [as Al]DAILY MX report only all year
005Enterococci: group D, MF trans, M-E, EIADAILY MX report only all year
005Flow, in conduit or thru treatment plantDAILY MX report only all year
005Mercury, dissolved [as Hg]DAILY MX report only all year
005Mercury, dissolved [as Hg]DAILY MX report only all year
006pHDAILY MN >= 6 SU all year
006pHDAILY MX <= 9 SU all year
006Nitrogen, total [as N]DAILY MX report only all year
006Nitrogen, total [as N]DAILY MX report only all year
006Enterococci: group D, MF trans, M-E, EIADAILY MX report only all year
006Flow, in conduit or thru treatment plantDAILY MX report only all year
006Mercury, dissolved [as Hg]DAILY MX report only all year
006Mercury, dissolved [as Hg]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