Inv Propylene LLC — NPDES permit TX0006068: limits, due date and EPA's record

Industrial Organic Chemicals, major discharger, Houston, Texas. NPDES permit TX0006068, in force until Jun 23, 2028. Last 12 months: over a limit 7 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period ending	Parameter	Reported	Limit	Over by
March 2026	Chlorine, total residual, daily maximum	.2 mg/L	≤ .1 mg/L	100%
March 2026	Copper, total [as Cu], daily average	.15 lb/d	≤ .13 lb/d	15%
March 2026	Copper, total [as Cu], daily maximum	.35 lb/d	≤ .28 lb/d	25%
June 2026	Benzene, daily average	.43 lb/d	≤ .33 lb/d	30%
June 2026	Benzene, daily maximum	1.25 lb/d	≤ .77 lb/d	62%
July 2026	Cyanide, free [as free], daily average	.19 lb/d	≤ .083 lb/d	129%
July 2026	Cyanide, free [as free], daily maximum	.61 lb/d	≤ .18 lb/d	239%

Limits in force (230)

Parameter	Statistic	Limit	Months	Outfall
Temperature, water deg. fahrenheit	daily average	≤ 105 deg F	all year	001
Temperature, water deg. fahrenheit	daily maximum	≤ 110 deg F	all year	001
BOD, 5-day, 20 deg. C	daily average	≤ 274 lb/d	all year	001
BOD, 5-day, 20 deg. C	daily maximum	≤ 548 lb/d	all year	001
Oxygen demand, chem. [high level] [COD]	daily average	≤ 1878 lb/d	all year	001
Oxygen demand, chem. [high level] [COD]	daily maximum	≤ 2817 lb/d	all year	001
pH	minimum	≥ 5 SU	all year	001
pH	maximum	≤ 11 SU	all year	001
Solids, total suspended	daily average	≤ 432 lb/d	all year	001
Solids, total suspended	daily maximum	≤ 1300 lb/d	all year	001
Oil & Grease	daily average	≤ 144 lb/d	all year	001
Oil & Grease	daily maximum	≤ 216 lb/d	all year	001
Cyanide, free [as free]	daily average	≤ .083 lb/d	all year	001
Cyanide, free [as free]	daily maximum	≤ .18 lb/d	all year	001
Copper, total [as Cu]	daily average	≤ .13 lb/d	all year	001
Copper, total [as Cu]	daily maximum	≤ .28 lb/d	all year	001
Aluminum, total [as Al]	daily maximum	report only (mg/L)	all year	001
Carbon tetrachloride	daily average	≤ .81 lb/d	all year	001
Carbon tetrachloride	daily maximum	≤ 2.18 lb/d	all year	001
1,2-Dichloroethane	daily average	≤ 1.03 lb/d	all year	001
1,2-Dichloroethane	daily maximum	≤ 3.29 lb/d	all year	001
Chloroform	daily average	≤ .64 lb/d	all year	001
Chloroform	daily maximum	≤ 1.86 lb/d	all year	001
Toluene	daily average	≤ .16 lb/d	all year	001
Toluene	daily maximum	≤ .42 lb/d	all year	001
Benzene	daily average	≤ .33 lb/d	all year	001
Benzene	daily maximum	≤ .77 lb/d	all year	001
Acenaphthylene	daily average	≤ .11 lb/d	all year	001
Acenaphthylene	daily maximum	≤ .27 lb/d	all year	001
Acenaphthene	daily average	≤ .11 lb/d	all year	001
Acenaphthene	daily maximum	≤ .27 lb/d	all year	001
Acrylonitrile	daily average	≤ .54 lb/d	all year	001
Acrylonitrile	daily maximum	≤ 1.33 lb/d	all year	001
Anthracene	daily average	≤ .11 lb/d	all year	001
Anthracene	daily maximum	≤ .27 lb/d	all year	001
Benzo[k]fluoranthene	daily average	≤ .11 lb/d	all year	001
Benzo[k]fluoranthene	daily maximum	≤ .27 lb/d	all year	001
Benzo[a]pyrene	daily average	≤ .00021 lb/d	all year	001
Benzo[a]pyrene	daily maximum	≤ .00045 lb/d	all year	001
Chlorobenzene	daily average	≤ .81 lb/d	all year	001
Chlorobenzene	daily maximum	≤ 2.18 lb/d	all year	001
Chrysene	daily average	≤ .11 lb/d	all year	001
Chrysene	daily maximum	≤ .27 lb/d	all year	001
Diethyl phthalate	daily average	≤ .26 lb/d	all year	001
Diethyl phthalate	daily maximum	≤ .65 lb/d	all year	001
Dimethyl phthalate	daily average	≤ .11 lb/d	all year	001
Dimethyl phthalate	daily maximum	≤ .27 lb/d	all year	001
Ethylbenzene	daily average	≤ .81 lb/d	all year	001
Ethylbenzene	daily maximum	≤ 2.18 lb/d	all year	001
Fluoranthene	daily average	≤ .13 lb/d	all year	001
Fluoranthene	daily maximum	≤ .31 lb/d	all year	001
Fluorene	daily average	≤ .11 lb/d	all year	001
Fluorene	daily maximum	≤ .27 lb/d	all year	001
Hexachlorobutadiene	daily average	≤ .019 lb/d	all year	001
Hexachlorobutadiene	daily maximum	≤ .04 lb/d	all year	001
Hexachloroethane	daily average	≤ .2 lb/d	all year	001
Hexachloroethane	daily maximum	≤ .42 lb/d	all year	001
Methyl chloride [Chloromethane]	daily average	≤ .63 lb/d	all year	001
Methyl chloride [Chloromethane]	daily maximum	≤ 1.69 lb/d	all year	001
Methylene chloride	daily average	≤ .21 lb/d	all year	001
Methylene chloride	daily maximum	≤ .97 lb/d	all year	001
Nitrobenzene	daily average	≤ 12.8 lb/d	all year	001
Nitrobenzene	daily maximum	≤ 36.7 lb/d	all year	001
Phenanthrene	daily average	≤ .11 lb/d	all year	001
Phenanthrene	daily maximum	≤ .24 lb/d	all year	001
Pyrene	daily average	≤ .11 lb/d	all year	001
Pyrene	daily maximum	≤ .28 lb/d	all year	001
Tetrachloroethylene	daily average	≤ .3 lb/d	all year	001
Tetrachloroethylene	daily maximum	≤ .94 lb/d	all year	001
1,1-Dichloroethane	daily average	≤ .13 lb/d	all year	001
1,1-Dichloroethane	daily maximum	≤ .34 lb/d	all year	001
1,1-Dichloroethylene	daily average	≤ .13 lb/d	all year	001
1,1-Dichloroethylene	daily maximum	≤ .34 lb/d	all year	001
1,1,1-Trichloroethane	daily average	≤ .13 lb/d	all year	001
1,1,1-Trichloroethane	daily maximum	≤ .34 lb/d	all year	001
1,1,2-Trichloroethane	daily average	≤ .18 lb/d	all year	001
1,1,2-Trichloroethane	daily maximum	≤ .73 lb/d	all year	001
Benzo[a]anthracene	daily average	≤ .0021 lb/d	all year	001
Benzo[a]anthracene	daily maximum	≤ .0045 lb/d	all year	001
1,2-Dichlorobenzene	daily average	≤ 1.12 lb/d	all year	001
1,2-Dichlorobenzene	daily maximum	≤ 4.55 lb/d	all year	001
1,2-Dichloropropane	daily average	≤ 1.12 lb/d	all year	001
1,2-Dichloropropane	daily maximum	≤ 4.55 lb/d	all year	001
trans-1,2-Dichloroethylene	daily average	≤ .14 lb/d	all year	001
trans-1,2-Dichloroethylene	daily maximum	≤ .38 lb/d	all year	001
1,2,4-Trichlorobenzene	daily average	≤ 1.12 lb/d	all year	001
1,2,4-Trichlorobenzene	daily maximum	≤ 4.55 lb/d	all year	001
1,3-Dichlorobenzene	daily average	≤ .81 lb/d	all year	001
1,3-Dichlorobenzene	daily maximum	≤ 2.18 lb/d	all year	001
1,4-Dichlorobenzene	daily average	≤ .81 lb/d	all year	001
1,4-Dichlorobenzene	daily maximum	≤ 2.18 lb/d	all year	001
2-Nitrophenol	daily average	≤ .37 lb/d	all year	001
2-Nitrophenol	daily maximum	≤ 1.32 lb/d	all year	001
2,4-Dimethylphenol	daily average	≤ .11 lb/d	all year	001
2,4-Dimethylphenol	daily maximum	≤ .27 lb/d	all year	001
2,4-Dinitrophenol	daily average	≤ 6.92 lb/d	all year	001
2,4-Dinitrophenol	daily maximum	≤ 24.6 lb/d	all year	001
4-Nitrophenol	daily average	≤ .93 lb/d	all year	001
4-Nitrophenol	daily maximum	≤ 3.3 lb/d	all year	001
4,6-Dinitro-o-cresol	daily average	≤ .45 lb/d	all year	001
4,6-Dinitro-o-cresol	daily maximum	≤ 1.59 lb/d	all year	001
Phenol	daily average	≤ .11 lb/d	all year	001
Phenol	daily maximum	≤ .27 lb/d	all year	001
Naphthalene	daily average	≤ .11 lb/d	all year	001
Naphthalene	daily maximum	≤ .27 lb/d	all year	001
Di[2-ethylhexyl] phthalate [DEHP]	daily average	≤ .54 lb/d	all year	001
Di[2-ethylhexyl] phthalate [DEHP]	daily maximum	≤ 1.48 lb/d	all year	001
Di-n-butyl phthalate	daily average	≤ .11 lb/d	all year	001
Di-n-butyl phthalate	daily maximum	≤ .25 lb/d	all year	001
Vinyl chloride	daily average	≤ .56 lb/d	all year	001
Vinyl chloride	daily maximum	≤ .99 lb/d	all year	001
Trichloroethylene	daily average	≤ .15 lb/d	all year	001
Trichloroethylene	daily maximum	≤ .4 lb/d	all year	001
Hexachlorobenzene	daily average	≤ .000058 lb/d	all year	001
Hexachlorobenzene	daily maximum	≤ .00012 lb/d	all year	001
Flow, in conduit or thru treatment plant	daily average	≤ 1.5 MGD	all year	001
Flow, in conduit or thru treatment plant	daily maximum	≤ 2 MGD	all year	001
Chlorine, total residual	daily average	report only (mg/L)	all year	001
Chlorine, total residual	daily maximum	≤ .1 mg/L	all year	001
1,3-Dichloropropylene	daily average	≤ 1.12 lb/d	all year	001
1,3-Dichloropropylene	daily maximum	≤ 4.55 lb/d	all year	001
3,4-Benzofluoranthene	daily average	≤ .11 lb/d	all year	001
3,4-Benzofluoranthene	daily maximum	≤ .28 lb/d	all year	001
pH range excursions, > 60 minutes	monthly total	≤ 0 occur/mo	all year	001
pH range excursions, monthly total accum	monthly total	≤ 446 min	all year	001
Chloroethane	daily average	≤ .63 lb/d	all year	001
Chloroethane	daily maximum	≤ 1.69 lb/d	all year	001
BOD, 5-day, 20 deg. C	daily maximum	≤ 80 mg/L	all year	002
pH	minimum	≥ 6 SU	all year	002
pH	maximum	≤ 9 SU	all year	002
Solids, total suspended	daily maximum	≤ 149 mg/L	all year	002
Oil & Grease	daily maximum	≤ 15 mg/L	all year	002
Carbon, tot organic [TOC]	daily maximum	≤ 75 mg/L	all year	002
Carbon tetrachloride	daily maximum	≤ .38 mg/L	all year	002
1,2-Dichloroethane	daily maximum	≤ .574 mg/L	all year	002
Chloroform	daily maximum	≤ .325 mg/L	all year	002
Toluene	daily maximum	≤ .074 mg/L	all year	002
Benzene	daily maximum	≤ .134 mg/L	all year	002
Acenaphthylene	daily maximum	≤ .047 mg/L	all year	002
Acenaphthene	daily maximum	≤ .047 mg/L	all year	002
Acrylonitrile	daily maximum	≤ .232 mg/L	all year	002
Anthracene	daily maximum	≤ .047 mg/L	all year	002
Benzo[k]fluoranthene	daily maximum	≤ .047 mg/L	all year	002
Benzo[a]pyrene	daily maximum	≤ .023 mg/L	all year	002
Chlorobenzene	daily maximum	≤ .38 mg/L	all year	002
Chrysene	daily maximum	≤ .047 mg/L	all year	002
Diethyl phthalate	daily maximum	≤ .113 mg/L	all year	002
Dimethyl phthalate	daily maximum	≤ .047 mg/L	all year	002
Ethylbenzene	daily maximum	≤ .38 mg/L	all year	002
Fluoranthene	daily maximum	≤ .054 mg/L	all year	002
Fluorene	daily maximum	≤ .047 mg/L	all year	002
Hexachlorobutadiene	daily maximum	≤ .38 mg/L	all year	002
Hexachloroethane	daily maximum	≤ .794 mg/L	all year	002
Methyl chloride [Chloromethane]	daily maximum	≤ .295 mg/L	all year	002
Methylene chloride	daily maximum	≤ .17 mg/L	all year	002
Nitrobenzene	daily maximum	≤ 6.402 mg/L	all year	002
Phenanthrene	daily maximum	≤ .046 mg/L	all year	002
Pyrene	daily maximum	≤ .048 mg/L	all year	002
Tetrachloroethylene	daily maximum	≤ .164 mg/L	all year	002
1,1-Dichloroethane	daily maximum	≤ .059 mg/L	all year	002
1,1-Dichloroethylene	daily maximum	≤ .06 mg/L	all year	002
1,1,1-Trichloroethane	daily maximum	≤ .059 mg/L	all year	002
1,1,2-Trichloroethane	daily maximum	≤ .127 mg/L	all year	002
Benzo[a]anthracene	daily maximum	≤ .047 mg/L	all year	002
1,2-Dichlorobenzene	daily maximum	≤ .794 mg/L	all year	002
1,2-Dichloropropane	daily maximum	≤ .794 mg/L	all year	002
trans-1,2-Dichloroethylene	daily maximum	≤ .066 mg/L	all year	002
1,2,4-Trichlorobenzene	daily maximum	≤ .794 mg/L	all year	002
1,3-Dichlorobenzene	daily maximum	≤ .38 mg/L	all year	002
1,4-Dichlorobenzene	daily maximum	≤ .38 mg/L	all year	002
2-Nitrophenol	daily maximum	≤ .231 mg/L	all year	002
2,4-Dimethylphenol	daily maximum	≤ .047 mg/L	all year	002
2,4-Dinitrophenol	daily maximum	≤ 4.291 mg/L	all year	002
4-Nitrophenol	daily maximum	≤ .576 mg/L	all year	002
4,6-Dinitro-o-cresol	daily maximum	≤ .277 mg/L	all year	002
Phenol	daily maximum	≤ .047 mg/L	all year	002
Naphthalene	daily maximum	≤ .047 mg/L	all year	002
Di[2-ethylhexyl] phthalate [DEHP]	daily maximum	≤ .258 mg/L	all year	002
Di-n-butyl phthalate	daily maximum	≤ .043 mg/L	all year	002
Vinyl chloride	daily maximum	≤ .172 mg/L	all year	002
Trichloroethylene	daily maximum	≤ .069 mg/L	all year	002
Hexachlorobenzene	daily maximum	≤ .325 mg/L	all year	002
Flow, in conduit or thru treatment plant	daily average	report only (MGD)	all year	002
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	002
1,3-Dichloropropylene	daily maximum	≤ .794 mg/L	all year	002
3,4-Benzofluoranthene	daily maximum	≤ .048 mg/L	all year	002
Chloroethane	daily maximum	≤ .295 mg/L	all year	002
pH	minimum	≥ 6 SU	all year	102
pH	maximum	≤ 9 SU	all year	102
Solids, total suspended	daily maximum	≤ 149 mg/L	all year	102
Oil & Grease	daily maximum	≤ 15 mg/L	all year	102
Carbon, tot organic [TOC]	daily maximum	≤ 75 mg/L	all year	102
Flow, in conduit or thru treatment plant	daily average	report only (MGD)	all year	102
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	102
Whole effluent toxicity - retest #1	7-day minimum	report only (pass=0;fail=1)	all year	TX1
Whole effluent toxicity - retest #1	7-day minimum	report only (pass=0;fail=1)	all year	TX1
Whole effluent toxicity - retest #1	monthly average minimum	report only (pass=0;fail=1)	all year	TX1
Whole effluent toxicity - retest #1	monthly average minimum	report only (pass=0;fail=1)	all year	TX1
Whole effluent toxicity - retest #2	7-day minimum	report only (pass=0;fail=1)	all year	TX1
Whole effluent toxicity - retest #2	7-day minimum	report only (pass=0;fail=1)	all year	TX1
Whole effluent toxicity - retest #2	monthly average minimum	report only (pass=0;fail=1)	all year	TX1
Whole effluent toxicity - retest #2	monthly average minimum	report only (pass=0;fail=1)	all year	TX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)	7-day minimum	report only (pass=0;fail=1)	all year	TX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)	monthly average minimum	report only (pass=0;fail=1)	all year	TX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia beryllina	7-day minimum	report only (pass=0;fail=1)	all year	TX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia beryllina	monthly average minimum	report only (pass=0;fail=1)	all year	TX1
NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	7-day minimum	report only (%)	all year	TX1
NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	monthly average minimum	report only (%)	all year	TX1
NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllina	7-day minimum	report only (%)	all year	TX1
NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllina	monthly average minimum	report only (%)	all year	TX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	7-day minimum	report only (%)	all year	TX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	monthly average minimum	report only (%)	all year	TX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina	7-day minimum	report only (%)	all year	TX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina	monthly average minimum	report only (%)	all year	TX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	7-day minimum	report only (pass=0;fail=1)	all year	TX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	monthly average minimum	report only (pass=0;fail=1)	all year	TX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina	7-day minimum	report only (pass=0;fail=1)	all year	TX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina	monthly average minimum	report only (pass=0;fail=1)	all year	TX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	7-day minimum	report only (%)	all year	TX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	monthly average minimum	report only (%)	all year	TX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia beryllina	7-day minimum	report only (%)	all year	TX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia beryllina	monthly average minimum	report only (%)	all year	TX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)	7-day minimum	report only (%)	all year	TX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)	monthly average minimum	report only (%)	all year	TX1
LOEC Sub-Lethal Growth Static Renewal 7 Day Chronic Menidia beryllina	7-day minimum	report only (%)	all year	TX1
LOEC Sub-Lethal Growth Static Renewal 7 Day Chronic Menidia beryllina	monthly average minimum	report only (%)	all year	TX1
Whole effluent toxicity - retest #1	single sample	report only (pass=0;fail=1)	all year	TXA
Whole effluent toxicity - retest #2	single sample	report only (pass=0;fail=1)	all year	TXA
LC50 Pass/Fail Static 24Hr Acute Americamysis bahia (formerly Mysidopsis bahia)	single sample	report only (pass=0;fail=1)	all year	TXA
LC50 Pass/Fail Static 24Hr Acute Menidia beryllina	single sample	report only (pass=0;fail=1)	all year	TXA

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/TX0006068 · MCP: https://passage-data.com/mcp