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Monument Chemical Houston LLC

Industrial Organic Chemicals, Houston, Texas. NPDES permit TX0085979, in force until Nov 16, 2028. Last 12 months: over a limit 2 times (last August 2026), 1 of 40 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (21 values), outfall 002 form A monthly (9 values), outfall 003 form A monthly (4 values), outfall TX1 form Q quarterly (30 values), outfall 001 form Y yearly, outfall TXA form S twice a year
Last report on file
September 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 0 of 43 reports late

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

Period endingParameterReportedLimitOver by
November 2025Oil & Grease, daily maximum22.9 mg/L≤ 15 mg/L53%
August 2026Carbon, tot organic [TOC], daily maximum437 mg/L≤ 75 mg/L483%

Limits in force (174)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cdaily average≤ 29 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 55 lb/dall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendeddaily average≤ 37 lb/dall year001
Solids, total suspendeddaily maximum≤ 55 lb/dall year001
Carbon, tot organic [TOC]daily average≤ 139 lb/dall year001
Carbon, tot organic [TOC]daily maximum≤ 206 lb/dall year001
Zinc, total [as Zn]daily average≤ .17 lb/dall year001
Zinc, total [as Zn]daily maximum≤ .35 lb/dall year001
Benzene, ethylbenzene, toluene, xylene combinationdaily maximumreport only (lb/d)all year001
Carbon tetrachloridedaily average≤ .004 lb/dall year001
Carbon tetrachloridedaily maximum≤ .008 lb/dall year001
1,2-Dichloroethanedaily average≤ .015 lb/dall year001
1,2-Dichloroethanedaily maximum≤ .046 lb/dall year001
Chloroformdaily average≤ .005 lb/dall year001
Chloroformdaily maximum≤ .01 lb/dall year001
Toluenedaily average≤ .006 lb/dall year001
Toluenedaily maximum≤ .018 lb/dall year001
Benzenedaily average≤ .008 lb/dall year001
Benzenedaily maximum≤ .03 lb/dall year001
Acenaphthylenedaily average≤ .005 lb/dall year001
Acenaphthylenedaily maximum≤ .013 lb/dall year001
Acenaphthenedaily average≤ .005 lb/dall year001
Acenaphthenedaily maximum≤ .013 lb/dall year001
Acrylonitriledaily average≤ .021 lb/dall year001
Acrylonitriledaily maximum≤ .053 lb/dall year001
Anthracenedaily average≤ .005 lb/dall year001
Anthracenedaily maximum≤ .0013 lb/dall year001
Benzo[k]fluoranthenedaily average≤ .005 lb/dall year001
Benzo[k]fluoranthenedaily maximum≤ .013 lb/dall year001
Benzo[a]pyrenedaily average≤ .005 lb/dall year001
Benzo[a]pyrenedaily maximum≤ .013 lb/dall year001
Chlorobenzenedaily average≤ .003 lb/dall year001
Chlorobenzenedaily maximum≤ .006 lb/dall year001
Chrysenedaily average≤ .005 lb/dall year001
Chrysenedaily maximum≤ .013 lb/dall year001
Diethyl phthalatedaily average≤ .018 lb/dall year001
Diethyl phthalatedaily maximum≤ .044 lb/dall year001
Dimethyl phthalatedaily average≤ .004 lb/dall year001
Dimethyl phthalatedaily maximum≤ .01 lb/dall year001
Ethylbenzenedaily average≤ .007 lb/dall year001
Ethylbenzenedaily maximum≤ .024 lb/dall year001
Fluoranthenedaily average≤ .005 lb/dall year001
Fluoranthenedaily maximum≤ .015 lb/dall year001
Fluorenedaily average≤ .005 lb/dall year001
Fluorenedaily maximum≤ .013 lb/dall year001
Hexachlorobutadienedaily average≤ .004 lb/dall year001
Hexachlorobutadienedaily maximum≤ .011 lb/dall year001
Hexachloroethanedaily average≤ .005 lb/dall year001
Hexachloroethanedaily maximum≤ .012 lb/dall year001
Methyl chloride [Chloromethane]daily average≤ .019 lb/dall year001
Methyl chloride [Chloromethane]daily maximum≤ .042 lb/dall year001
Methylene chloridedaily average≤ .009 lb/dall year001
Methylene chloridedaily maximum≤ .019 lb/dall year001
Nitrobenzenedaily average≤ .006 lb/dall year001
Nitrobenzenedaily maximum≤ .015 lb/dall year001
Phenanthrenedaily average≤ .005 lb/dall year001
Phenanthrenedaily maximum≤ .013 lb/dall year001
Pyrenedaily average≤ .005 lb/dall year001
Pyrenedaily maximum≤ .015 lb/dall year001
Tetrachloroethylenedaily average≤ .005 lb/dall year001
Tetrachloroethylenedaily maximum≤ .012 lb/dall year001
1,1-Dichloroethanedaily average≤ .005 lb/dall year001
1,1-Dichloroethanedaily maximum≤ .013 lb/dall year001
1,1-Dichloroethylenedaily average≤ .004 lb/dall year001
1,1-Dichloroethylenedaily maximum≤ .005 lb/dall year001
1,1,1-Trichloroethanedaily average≤ .005 lb/dall year001
1,1,1-Trichloroethanedaily maximum≤ .012 lb/dall year001
1,1,2-Trichloroethanedaily average≤ .005 lb/dall year001
1,1,2-Trichloroethanedaily maximum≤ .012 lb/dall year001
Benzo[a]anthracenedaily average≤ .005 lb/dall year001
Benzo[a]anthracenedaily maximum≤ .013 lb/dall year001
1,2-Dichlorobenzenedaily average≤ .017 lb/dall year001
1,2-Dichlorobenzenedaily maximum≤ .036 lb/dall year001
1,2-Dichloropropanedaily average≤ .034 lb/dall year001
1,2-Dichloropropanedaily maximum≤ .05 lb/dall year001
trans-1,2-Dichloroethylenedaily average≤ .005 lb/dall year001
trans-1,2-Dichloroethylenedaily maximum≤ .012 lb/dall year001
1,2,4-Trichlorobenzenedaily average≤ .015 lb/dall year001
1,2,4-Trichlorobenzenedaily maximum≤ .031 lb/dall year001
1,3-Dichlorobenzenedaily average≤ .007 lb/dall year001
1,3-Dichlorobenzenedaily maximum≤ .01 lb/dall year001
1,4-Dichlorobenzenedaily average≤ .003 lb/dall year001
1,4-Dichlorobenzenedaily maximum≤ .006 lb/dall year001
2-Chlorophenoldaily average≤ .007 lb/dall year001
2-Chlorophenoldaily maximum≤ .021 lb/dall year001
2-Nitrophenoldaily average≤ .009 lb/dall year001
2-Nitrophenoldaily maximum≤ .015 lb/dall year001
2,4-Dichlorophenoldaily average≤ .009 lb/dall year001
2,4-Dichlorophenoldaily maximum≤ .025 lb/dall year001
2,4-Dimethylphenoldaily average≤ .004 lb/dall year001
2,4-Dimethylphenoldaily maximum≤ .008 lb/dall year001
2,4-Dinitrotoluenedaily average≤ .025 lb/dall year001
2,4-Dinitrotoluenedaily maximum≤ .062 lb/dall year001
2,4-Dinitrophenoldaily average≤ .016 lb/dall year001
2,4-Dinitrophenoldaily maximum≤ .027 lb/dall year001
2,6-Dinitrotoluenedaily average≤ .056 lb/dall year001
2,6-Dinitrotoluenedaily maximum≤ .14 lb/dall year001
4-Nitrophenoldaily average≤ .016 lb/dall year001
4-Nitrophenoldaily maximum≤ .027 lb/dall year001
4,6-Dinitro-o-cresoldaily average≤ .017 lb/dall year001
4,6-Dinitro-o-cresoldaily maximum≤ .061 lb/dall year001
Phenoldaily average≤ .003 lb/dall year001
Phenoldaily maximum≤ .006 lb/dall year001
Naphthalenedaily average≤ .005 lb/dall year001
Naphthalenedaily maximum≤ .013 lb/dall year001
Di[2-ethylhexyl] phthalate [DEHP]daily average≤ .023 lb/dall year001
Di[2-ethylhexyl] phthalate [DEHP]daily maximum≤ .061 lb/dall year001
Di-n-butyl phthalatedaily average≤ .006 lb/dall year001
Di-n-butyl phthalatedaily maximum≤ .012 lb/dall year001
Vinyl chloridedaily average≤ .023 lb/dall year001
Vinyl chloridedaily maximum≤ .059 lb/dall year001
Trichloroethylenedaily average≤ .005 lb/dall year001
Trichloroethylenedaily maximum≤ .012 lb/dall year001
Hexachlorobenzenedaily average≤ .00054 lb/dall year001
Hexachlorobenzenedaily maximum≤ .00114 lb/dall year001
Flow, in conduit or thru treatment plantdaily average≤ .22 MGDall year001
Flow, in conduit or thru treatment plantdaily maximum≤ .44 MGDall year001
1,3-Dichloropropylenedaily average≤ .006 lb/dall year001
1,3-Dichloropropylenedaily maximum≤ .01 lb/dall year001
Enterococcidaily average≤ 168 MPN/100mLall year001
Enterococcidaily maximumreport only (MPN/100mL)all year001
3,4-Benzofluoranthenedaily average≤ .005 lb/dall year001
3,4-Benzofluoranthenedaily maximum≤ .013 lb/dall year001
Chloroethanedaily average≤ .023 lb/dall year001
Chloroethanedaily maximum≤ .059 lb/dall year001
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Oil & Greasedaily average≤ 15 mg/Lall year002
Oil & Greasedaily maximum≤ 15 mg/Lall year002
Carbon, tot organic [TOC]daily maximum≤ 75 mg/Lall year002
Zinc, total [as Zn]daily average≤ .24 mg/Lall year002
Zinc, total [as Zn]daily maximum≤ .5 mg/Lall year002
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
pHminimum≥ 6 SUall year003
pHmaximum≤ 9 SUall year003
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year003
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year003
Whole effluent toxicity - retest #17-day minimumreport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #1monthly average minimumreport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #27-day minimumreport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #2monthly average minimumreport only (pass=0;fail=1)all yearTX1
Whole Effluent Toxicity [WET] - Americamysis bahia (formerly Mysidopsis bahia)7-day minimum≥ 8 %all yearTX1
Whole Effluent Toxicity [WET] - Americamysis bahia (formerly Mysidopsis bahia)monthly average minimum≥ 8 %all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)7-day minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)monthly average minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia beryllina7-day minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia beryllinamonthly average minimumreport only (pass=0;fail=1)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7-day minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)monthly average minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllina7-day minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllinamonthly average minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7-day minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)monthly average minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina7-day minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllinamonthly average minimumreport only (%)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7-day minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)monthly average minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina7-day minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllinamonthly average minimumreport only (pass=0;fail=1)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7-day minimumreport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)monthly average minimumreport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia beryllina7-day minimumreport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia beryllinamonthly average minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)7-day minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)monthly average minimumreport only (%)all yearTX1
LOEC Sub-Lethal Growth Static Renewal 7 Day Chronic Menidia beryllina7-day minimumreport only (%)all yearTX1
LOEC Sub-Lethal Growth Static Renewal 7 Day Chronic Menidia beryllinamonthly average minimumreport only (%)all yearTX1
Whole effluent toxicity - retest #1single samplereport only (pass=0;fail=1)all yearTXA
Whole effluent toxicity - retest #2single samplereport only (pass=0;fail=1)all yearTXA
LC50 Pass/Fail Static 24Hr Acute Americamysis bahia (formerly Mysidopsis bahia)single samplereport only (pass=0;fail=1)all yearTXA
LC50 Pass/Fail Static 24Hr Acute Menidia beryllinasingle samplereport only (pass=0;fail=1)all yearTXA

New limits from Dec 1, 2026

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Benzo[a]anthracene, daily average0.002 lb/dtighter——
Benzo[a]anthracene, daily maximum0.003 lb/dtighter——
Benzo[a]pyrene, daily average0.0002 lb/dtighter——
Benzo[a]pyrene, daily maximum0.0003 lb/dtighter——
Hexachlorobenzene, daily average0.000043 lb/dtighter——
Hexachlorobenzene, daily maximum0.0000901 lb/dtighter——

How strict are these limits?

Cited limits by parameter: Texas's rules and the federal ones.

Same industry: the 165 Chemicals and Allied Products permits in Texas.

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Your permit document is the final word. As JSON: /api/v1/permits/TX0085979 · MCP: https://passage-data.com/mcp