COVESTRO LLC

NPDES permit TX0002798 · Major NON-POTW · effective, expires 2027-10-31 · 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 72 forms filed late

Last period with anything received: 2026-08-31.

Reporting

Reports are due about 20 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (220)

OutfallParameterStatisticLimitMonths
002pHMINIMUM >= 6 SU all year
002pHMAXIMUM <= 9 SU all year
002Oil & GreaseDAILY MX <= 15 mg/L all year
002Carbon, tot organic [TOC]DAILY MX <= 70 mg/L all year
002Flow, in conduit or thru treatment plantDAILY AV report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
003pHMINIMUM >= 6 SU all year
003pHMAXIMUM <= 9 SU all year
003Oil & GreaseDAILY MX <= 15 mg/L all year
003Carbon, tot organic [TOC]DAILY MX <= 70 mg/L all year
003Flow, in conduit or thru treatment plantDAILY AV report only all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
004pHMINIMUM >= 6 SU all year
004pHMAXIMUM <= 9 SU all year
004Oil & GreaseDAILY MX <= 15 mg/L all year
004Carbon, tot organic [TOC]DAILY MX <= 70 mg/L all year
004Flow, in conduit or thru treatment plantDAILY AV report only all year
004Flow, in conduit or thru treatment plantDAILY MX report only all year
006pHMINIMUM >= 6 SU all year
006pHMAXIMUM <= 9 SU all year
006Oil & GreaseDAILY MX <= 15 mg/L all year
006Carbon, tot organic [TOC]DAILY MX <= 70 mg/L all year
006Flow, in conduit or thru treatment plantDAILY AV report only all year
006Flow, in conduit or thru treatment plantDAILY MX report only all year
007Oxygen, dissolved [DO]MO MIN >= 4 mg/L all year
007Oxygen demand, chem. [high level] [COD]DAILY AV report only all year
007Oxygen demand, chem. [high level] [COD]DAILY MX report only all year
007Oxygen demand, chem. [high level] [COD]DAILY AV <= 10827 lb/d all year
007Oxygen demand, chem. [high level] [COD]DAILY MX <= 21654 lb/d all year
007pHMINIMUM >= 5 SU all year
007pHMAXIMUM <= 11 SU all year
007Solids, total suspendedDAILY AV <= 4199 lb/d all year
007Solids, total suspendedDAILY MX <= 12150 lb/d all year
007Nitrogen, ammonia total [as N]DAILY AV <= 15 mg/L all year
007Nitrogen, ammonia total [as N]DAILY MX <= 30 mg/L all year
007Nitrogen, ammonia total [as N]DAILY AV <= 1251 lb/d all year
007Nitrogen, ammonia total [as N]DAILY MX <= 2502 lb/d all year
007Carbon, tot organic [TOC]DAILY AV <= 4253 lb/d all year
007Carbon, tot organic [TOC]DAILY MX <= 8507 lb/d all year
007Cyanide, free [as free]DAILY AV <= .027 mg/L all year
007Cyanide, free [as free]DAILY MX <= .056 mg/L all year
007Cyanide, free [as free]DAILY AV <= 2.22 lb/d all year
007Cyanide, free [as free]DAILY MX <= 4.7 lb/d all year
007Cyanide, total [as CN]DAILY AV <= 3.36 lb/d all year
007Cyanide, total [as CN]DAILY MX <= 9.61 lb/d all year
007Copper, total [as Cu]DAILY AV <= .111 mg/L all year
007Copper, total [as Cu]DAILY MX <= .236 mg/L all year
007Copper, total [as Cu]DAILY AV <= 10.9 lb/d all year
007Copper, total [as Cu]DAILY MX <= 23.31 lb/d all year
007Lead, total [as Pb]DAILY AV report only all year
007Lead, total [as Pb]DAILY MX report only all year
007Lead, total [as Pb]DAILY AV <= 4.56 lb/d all year
007Lead, total [as Pb]DAILY MX <= 11.28 lb/d all year
007Nickel, total [as Ni]DAILY AV report only all year
007Nickel, total [as Ni]DAILY MX report only all year
007Nickel, total [as Ni]DAILY AV <= 11.3 lb/d all year
007Nickel, total [as Ni]DAILY MX <= 28.71 lb/d all year
007Carbon tetrachlorideDAILY AV <= 2.71 lb/d all year
007Carbon tetrachlorideDAILY MX <= 6.77 lb/d all year
0071,2-DichloroethaneDAILY AV <= 5.64 lb/d all year
0071,2-DichloroethaneDAILY MX <= 17.71 lb/d all year
007ChloroformDAILY AV <= 2.46 lb/d all year
007ChloroformDAILY MX <= 6.45 lb/d all year
007TolueneDAILY AV <= 1.63 lb/d all year
007TolueneDAILY MX <= 4.8 lb/d all year
007BenzeneDAILY AV <= 2.54 lb/d all year
007BenzeneDAILY MX <= 8.35 lb/d all year
007AcenaphthyleneDAILY AV <= 1.29 lb/d all year
007AcenaphthyleneDAILY MX <= 3.37 lb/d all year
007AcenaphtheneDAILY AV <= 1.29 lb/d all year
007AcenaphtheneDAILY MX <= 3.37 lb/d all year
007AcrylonitrileDAILY AV <= 5.88 lb/d all year
007AcrylonitrileDAILY MX <= 14.71 lb/d all year
007AnthraceneDAILY AV <= 1.29 lb/d all year
007AnthraceneDAILY MX <= 3.37 lb/d all year
007Benzo[k]fluorantheneDAILY AV <= 1.29 lb/d all year
007Benzo[k]fluorantheneDAILY MX <= 2.37 lb/d all year
007Benzo[a]pyreneDAILY AV <= .0092 lb/d all year
007Benzo[a]pyreneDAILY MX <= .0195 lb/d all year
007ChlorobenzeneDAILY AV <= 2.57 lb/d all year
007ChlorobenzeneDAILY MX <= 6.28 lb/d all year
007ChryseneDAILY AV <= 1.29 lb/d all year
007ChryseneDAILY MX <= 3.37 lb/d all year
007Diethyl phthalateDAILY AV <= 4.2 lb/d all year
007Diethyl phthalateDAILY MX <= 10.47 lb/d all year
007Dimethyl phthalateDAILY AV <= 1.17 lb/d all year
007Dimethyl phthalateDAILY MX <= 2.9 lb/d all year
007EthylbenzeneDAILY AV <= 3.4 lb/d all year
007EthylbenzeneDAILY MX <= 10.18 lb/d all year
007FluorantheneDAILY AV <= 1.47 lb/d all year
007FluorantheneDAILY MX <= 3.88 lb/d all year
007FluoreneDAILY AV <= 1.29 lb/d all year
007FluoreneDAILY MX <= 3.37 lb/d all year
007HexachlorobutadieneDAILY AV <= .81 lb/d all year
007HexachlorobutadieneDAILY MX <= 1.71 lb/d all year
007HexachloroethaneDAILY AV <= 3.56 lb/d all year
007HexachloroethaneDAILY MX <= 12.9 lb/d all year
007Methyl chloride [Chloromethane]DAILY AV <= 5.62 lb/d all year
007Methyl chloride [Chloromethane]DAILY MX <= 13.08 lb/d all year
007Methylene chlorideDAILY AV <= 2.38 lb/d all year
007Methylene chlorideDAILY MX <= 6.54 lb/d all year
007NitrobenzeneDAILY AV <= 30.24 lb/d all year
007NitrobenzeneDAILY MX <= 86.08 lb/d all year
007PhenanthreneDAILY AV <= 1.29 lb/d all year
007PhenanthreneDAILY MX <= 3.37 lb/d all year
007PyreneDAILY AV <= 1.43 lb/d all year
007PyreneDAILY MX <= 3.7 lb/d all year
007TetrachloroethyleneDAILY AV <= 1.75 lb/d all year
007TetrachloroethyleneDAILY MX <= 4.85 lb/d all year
0071,1-DichloroethaneDAILY AV <= 1.36 lb/d all year
0071,1-DichloroethaneDAILY MX <= 3.64 lb/d all year
0071,1-DichloroethyleneDAILY AV <= 1.07 lb/d all year
0071,1-DichloroethyleneDAILY MX <= 2 lb/d all year
0071,1,1-TrichloroethaneDAILY AV <= 1.31 lb/d all year
0071,1,1-TrichloroethaneDAILY MX <= 3.4 lb/d all year
0071,1,2-TrichloroethaneDAILY AV <= 1.44 lb/d all year
0071,1,2-TrichloroethaneDAILY MX <= 4.28 lb/d all year
007Benzo[a]anthraceneDAILY AV <= .092 lb/d all year
007Benzo[a]anthraceneDAILY MX <= .195 lb/d all year
0071,2-DichlorobenzeneDAILY AV <= 6.29 lb/d all year
0071,2-DichlorobenzeneDAILY MX <= 18.22 lb/d all year
0071,2-DichloropropaneDAILY AV <= 10 lb/d all year
0071,2-DichloropropaneDAILY MX <= 21.49 lb/d all year
007trans-1,2-DichloroethyleneDAILY AV <= 1.35 lb/d all year
007trans-1,2-DichloroethyleneDAILY MX <= 3.49 lb/d all year
0071,2,4-TrichlorobenzeneDAILY AV <= 5.85 lb/d all year
0071,2,4-TrichlorobenzeneDAILY MX <= 17.09 lb/d all year
0071,3-DichlorobenzeneDAILY AV <= 3.35 lb/d all year
0071,3-DichlorobenzeneDAILY MX <= 7.06 lb/d all year
0071,4-DichlorobenzeneDAILY AV <= 2.57 lb/d all year
0071,4-DichlorobenzeneDAILY MX <= 6.28 lb/d all year
0072-ChlorophenolDAILY AV <= 1.2 lb/d all year
0072-ChlorophenolDAILY MX <= 3.8 lb/d all year
0072-NitrophenolDAILY AV <= 2.84 lb/d all year
0072-NitrophenolDAILY MX <= 6.35 lb/d all year
0072,4-DichlorophenolDAILY AV <= 1.51 lb/d all year
0072,4-DichlorophenolDAILY MX <= 4.35 lb/d all year
0072,4-DimethylphenolDAILY AV <= 1.12 lb/d all year
0072,4-DimethylphenolDAILY MX <= 2.36 lb/d all year
0072,4-DinitrotolueneDAILY AV <= 4.38 lb/d all year
0072,4-DinitrotolueneDAILY MX <= 11.06 lb/d all year
0072,4-DinitrophenolDAILY AV <= 19.07 lb/d all year
0072,4-DinitrophenolDAILY MX <= 61.47 lb/d all year
0072,6-DinitrotolueneDAILY AV <= 9.9 lb/d all year
0072,6-DinitrotolueneDAILY MX <= 24.87 lb/d all year
0074-NitrophenolDAILY AV <= 5.61 lb/d all year
0074-NitrophenolDAILY MX <= 13.5 lb/d all year
0074,6-Dinitro-o-cresolDAILY AV <= 4.81 lb/d all year
0074,6-Dinitro-o-cresolDAILY MX <= 17.1 lb/d all year
007PhenolDAILY AV <= .98 lb/d all year
007PhenolDAILY MX <= 1.88 lb/d all year
007NaphthaleneDAILY AV <= 1.29 lb/d all year
007NaphthaleneDAILY MX <= 3.37 lb/d all year
007Di[2-ethylhexyl] phthalate [DEHP]DAILY AV <= 6.18 lb/d all year
007Di[2-ethylhexyl] phthalate [DEHP]DAILY MX <= 16.75 lb/d all year
007Di-n-butyl phthalateDAILY AV <= 1.51 lb/d all year
007Di-n-butyl phthalateDAILY MX <= 3.2 lb/d all year
007Vinyl chlorideDAILY AV <= 6.26 lb/d all year
007Vinyl chlorideDAILY MX <= 14.35 lb/d all year
007TrichloroethyleneDAILY AV <= 1.36 lb/d all year
007TrichloroethyleneDAILY MX <= 3.53 lb/d all year
007HexachlorobenzeneDAILY AV <= .00019 mg/L all year
007HexachlorobenzeneDAILY MX <= .00039 mg/L all year
007HexachlorobenzeneDAILY AV <= .0159 lb/d all year
007HexachlorobenzeneDAILY MX <= .0325 lb/d all year
007Petrol hydrocarbons, total recoverableDAILY AV <= 15 mg/L all year
007Petrol hydrocarbons, total recoverableDAILY MX <= 20 mg/L all year
007Petrol hydrocarbons, total recoverableDAILY AV <= 1064 lb/d all year
007Petrol hydrocarbons, total recoverableDAILY MX <= 1419 lb/d all year
007Flow, in conduit or thru treatment plantDAILY AV <= 10 MGD all year
007Flow, in conduit or thru treatment plantDAILY MX <= 12 MGD all year
007Chlorine, total residualDAILY AV report only all year
007Chlorine, total residualDAILY MX report only all year
007Chlorine, total residualDAILY AV <= 18.96 lb/d all year
007Chlorine, total residualDAILY MX <= 31.2 lb/d all year
0071,3-DichloropropyleneDAILY AV <= 3.95 lb/d all year
0071,3-DichloropropyleneDAILY MX <= 12.41 lb/d all year
0073,4-BenzofluorantheneDAILY AV <= 1.35 lb/d all year
0073,4-BenzofluorantheneDAILY MX <= 3.47 lb/d all year
007BOD, carbonaceous [5 day, 20 C]DAILY AV <= 24.9 mg/L all year
007BOD, carbonaceous [5 day, 20 C]DAILY MX <= 60 mg/L all year
007BOD, carbonaceous [5 day, 20 C]DAILY AV <= 2079 lb/d all year
007BOD, carbonaceous [5 day, 20 C]DAILY MX <= 5004 lb/d all year
007pH range excursions, > 60 minutesMO TOTAL <= 0 occur/mo all year
007pH range excursions, monthly total accumMO TOTAL <= 446 min all year
007ChloroethaneDAILY AV <= 6.5 lb/d all year
007ChloroethaneDAILY MX <= 16.89 lb/d all year
107BOD, 5-day, 20 deg. CDAILY MX <= 65 mg/L all year
107Solids, total suspendedDAILY MX <= 65 mg/L all year
107Flow, in conduit or thru treatment plantDAILY AV report only all year
107Flow, in conduit or thru treatment plantDAILY MX report only all year
107Chlorine, total residualMO MIN >= 1 mg/L all year
107EnterococciDAILY AV <= 35 CFU/100mL all year
107EnterococciDAILY MX <= 104 CFU/100mL all year
TX7Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)7 DA MIN report only all year
TX7Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)MO AV MN report only all year
TX7Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia beryllina7 DA MIN report only all year
TX7Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia beryllinaMO AV MN report only all year
TX7NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7 DA MIN report only all year
TX7NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)MO AV MN report only all year
TX7NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllina7 DA MIN report only all year
TX7NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllinaMO AV MN report only all year
TX7NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7 DA MIN report only all year
TX7NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)MO AV MN report only all year
TX7NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina7 DA MIN report only all year
TX7NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllinaMO AV MN report only all year
TX7Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7 DA MIN report only all year
TX7Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)MO AV MN report only all year
TX7Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina7 DA MIN report only all year
TX7Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllinaMO AV MN report only all year
TX7LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7 DA MIN report only all year
TX7LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)MO AV MN report only all year
TX7LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia beryllina7 DA MIN report only all year
TX7LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia beryllinaMO AV MN report only all year
TX7LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)7 DA MIN report only all year
TX7LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)MO AV MN report only all year
TX7LOEC Sub-Lethal Growth Static Renewal 7 Day Chronic Menidia beryllina7 DA MIN report only all year
TX7LOEC Sub-Lethal Growth Static Renewal 7 Day Chronic Menidia beryllinaMO AV MN report only all year
TXGLC50 Pass/Fail Static 24Hr Acute Americamysis bahia (formerly Mysidopsis bahia)SINGSAMP report only all year
TXGLC50 Pass/Fail Static 24Hr Acute Menidia beryllinaSINGSAMP report only all year

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