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Occidental Chemial Corporation

Industrial Organic Chemicals, major discharger, Gregory, Texas. NPDES permit TX0104876 expired Jun 2, 2026; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (19 values), outfall 102 form A monthly (7 values), outfall 202 form A monthly (7 values), outfall 001 form Y yearly, outfall TX1 form S twice a year, outfall TX1 form Y yearly, and 1 more form
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 42 reports late

Limits in force (175)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitdaily maximum≤ 110 deg Fall year001
BOD, 5-day, 20 deg. Cdaily average≤ 407 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 1021 lb/dall year001
pHminimum≥ 5 SUall year001
pHmaximum≤ 11 SUall year001
Solids, total suspendeddaily average≤ 672 lb/dall year001
Solids, total suspendeddaily maximum≤ 2195 lb/dall year001
Copper, total [as Cu]daily average≤ 2.03 lb/dall year001
Copper, total [as Cu]daily maximum≤ 4.31 lb/dall year001
Carbon tetrachloridedaily average≤ .19 lb/dall year001
Carbon tetrachloridedaily maximum≤ .39 lb/dall year001
1,2-Dichloroethanedaily average≤ .7 lb/dall year001
1,2-Dichloroethanedaily maximum≤ 2.17 lb/dall year001
Chloroformdaily average≤ .36 lb/dall year001
Chloroformdaily maximum≤ .78 lb/dall year001
Toluenedaily average≤ .27 lb/dall year001
Toluenedaily maximum≤ .82 lb/dall year001
Benzenedaily average≤ .38 lb/dall year001
Benzenedaily maximum≤ 1.4 lb/dall year001
Acenaphthylenedaily average≤ .23 lb/dall year001
Acenaphthylenedaily maximum≤ .61 lb/dall year001
Acenaphthenedaily average≤ .23 lb/dall year001
Acenaphthenedaily maximum≤ .61 lb/dall year001
Acrylonitriledaily average≤ .99 lb/dall year001
Acrylonitriledaily maximum≤ 2.49 lb/dall year001
Anthracenedaily average≤ .23 lb/dall year001
Anthracenedaily maximum≤ .61 lb/dall year001
Benzo[b]fluoranthenedaily average≤ .24 lb/dall year001
Benzo[b]fluoranthenedaily maximum≤ .63 lb/dall year001
Benzo[k]fluoranthenedaily average≤ .23 lb/dall year001
Benzo[k]fluoranthenedaily maximum≤ .61 lb/dall year001
Benzo[a]pyrenedaily average≤ .003 lb/dall year001
Benzo[a]pyrenedaily maximum≤ .006 lb/dall year001
Chlorobenzenedaily average≤ .15 lb/dall year001
Chlorobenzenedaily maximum≤ .29 lb/dall year001
Chrysenedaily average≤ .23 lb/dall year001
Chrysenedaily maximum≤ .61 lb/dall year001
Diethyl phthalatedaily average≤ .83 lb/dall year001
Diethyl phthalatedaily maximum≤ 2.09 lb/dall year001
Dimethyl phthalatedaily average≤ .2 lb/dall year001
Dimethyl phthalatedaily maximum≤ .48 lb/dall year001
Ethylbenzenedaily average≤ .33 lb/dall year001
Ethylbenzenedaily maximum≤ 1.11 lb/dall year001
Fluoranthenedaily average≤ .26 lb/dall year001
Fluoranthenedaily maximum≤ .7 lb/dall year001
Fluorenedaily average≤ .23 lb/dall year001
Fluorenedaily maximum≤ .61 lb/dall year001
Hexachlorobutadienedaily average≤ .21 lb/dall year001
Hexachlorobutadienedaily maximum≤ .5 lb/dall year001
Hexachloroethanedaily average≤ .22 lb/dall year001
Hexachloroethanedaily maximum≤ .56 lb/dall year001
Methyl chloride [Chloromethane]daily average≤ .88 lb/dall year001
Methyl chloride [Chloromethane]daily maximum≤ 1.95 lb/dall year001
Methylene chloridedaily average≤ .41 lb/dall year001
Methylene chloridedaily maximum≤ .92 lb/dall year001
Nitrobenzenedaily average≤ .28 lb/dall year001
Nitrobenzenedaily maximum≤ .7 lb/dall year001
Phenanthrenedaily average≤ .23 lb/dall year001
Phenanthrenedaily maximum≤ .61 lb/dall year001
Pyrenedaily average≤ .26 lb/dall year001
Pyrenedaily maximum≤ .69 lb/dall year001
Tetrachloroethylenedaily average≤ .23 lb/dall year001
Tetrachloroethylenedaily maximum≤ .58 lb/dall year001
1,1-Dichloroethanedaily average≤ .23 lb/dall year001
1,1-Dichloroethanedaily maximum≤ .61 lb/dall year001
1,1-Dichloroethylenedaily average≤ .16 lb/dall year001
1,1-Dichloroethylenedaily maximum≤ .26 lb/dall year001
1,1,1-Trichloroethanedaily average≤ .22 lb/dall year001
1,1,1-Trichloroethanedaily maximum≤ .56 lb/dall year001
1,1,2-Trichloroethanedaily average≤ .22 lb/dall year001
1,1,2-Trichloroethanedaily maximum≤ .56 lb/dall year001
Benzo[a]anthracenedaily average≤ .026 lb/dall year001
Benzo[a]anthracenedaily maximum≤ .056 lb/dall year001
1,2-Dichlorobenzenedaily average≤ .79 lb/dall year001
1,2-Dichlorobenzenedaily maximum≤ 1.68 lb/dall year001
1,2-Dichloropropanedaily average≤ 1.57 lb/dall year001
1,2-Dichloropropanedaily maximum≤ 2.36 lb/dall year001
trans-1,2-Dichloroethylenedaily average≤ .22 lb/dall year001
trans-1,2-Dichloroethylenedaily maximum≤ .56 lb/dall year001
1,2,4-Trichlorobenzenedaily average≤ .7 lb/dall year001
1,2,4-Trichlorobenzenedaily maximum≤ 1.44 lb/dall year001
1,3-Dichlorobenzenedaily average≤ .32 lb/dall year001
1,3-Dichlorobenzenedaily maximum≤ .45 lb/dall year001
1,4-Dichlorobenzenedaily average≤ .15 lb/dall year001
1,4-Dichlorobenzenedaily maximum≤ .29 lb/dall year001
2-Chlorophenoldaily average≤ .32 lb/dall year001
2-Chlorophenoldaily maximum≤ 1.01 lb/dall year001
2-Nitrophenoldaily average≤ .42 lb/dall year001
2-Nitrophenoldaily maximum≤ .71 lb/dall year001
2,4-Dichlorophenoldaily average≤ .4 lb/dall year001
2,4-Dichlorophenoldaily maximum≤ 1.15 lb/dall year001
2,4-Dimethylphenoldaily average≤ .19 lb/dall year001
2,4-Dimethylphenoldaily maximum≤ .37 lb/dall year001
2,4-Dinitrotoluenedaily average≤ 1.16 lb/dall year001
2,4-Dinitrotoluenedaily maximum≤ 2.93 lb/dall year001
2,4-Dinitrophenoldaily average≤ .73 lb/dall year001
2,4-Dinitrophenoldaily maximum≤ 1.26 lb/dall year001
2,6-Dinitrotoluenedaily average≤ 2.62 lb/dall year001
2,6-Dinitrotoluenedaily maximum≤ 6.59 lb/dall year001
4-Nitrophenoldaily average≤ .74 lb/dall year001
4-Nitrophenoldaily maximum≤ 1.27 lb/dall year001
4,6-Dinitro-o-cresoldaily average≤ .8 lb/dall year001
4,6-Dinitro-o-cresoldaily maximum≤ 2.85 lb/dall year001
Phenoldaily average≤ .15 lb/dall year001
Phenoldaily maximum≤ .27 lb/dall year001
Naphthalenedaily average≤ .23 lb/dall year001
Naphthalenedaily maximum≤ .61 lb/dall year001
Di[2-ethylhexyl] phthalate [DEHP]daily average≤ 1.06 lb/dall year001
Di[2-ethylhexyl] phthalate [DEHP]daily maximum≤ 2.87 lb/dall year001
Di-n-butyl phthalatedaily average≤ .28 lb/dall year001
Di-n-butyl phthalatedaily maximum≤ .59 lb/dall year001
Vinyl chloridedaily average≤ 1.07 lb/dall year001
Vinyl chloridedaily maximum≤ 2.76 lb/dall year001
Trichloroethylenedaily average≤ .22 lb/dall year001
Trichloroethylenedaily maximum≤ .56 lb/dall year001
Hexachlorobenzenedaily average≤ .0007 lb/dall year001
Hexachlorobenzenedaily maximum≤ .0015 lb/dall year001
Flow, in conduit or thru treatment plantdaily average≤ 2.79 MGDall year001
Flow, in conduit or thru treatment plantdaily maximum≤ 3.8 MGDall year001
1,3-Dichloropropylenedaily average≤ .3 lb/dall year001
1,3-Dichloropropylenedaily maximum≤ .45 lb/dall year001
pH range excursions, > 60 minutesmonthly total≤ 0 occur/moall year001
pH range excursions, monthly total accummonthly total≤ 446 minall year001
Chloroethanedaily average≤ 1.07 lb/dall year001
Chloroethanedaily maximum≤ 2.76 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 65 mg/Lall year102
Solids, total suspendeddaily maximum≤ 65 mg/Lall year102
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year102
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year102
Chlorine, total residualmonthly minimum≥ 1 mg/Lall year102
Enterococcidaily average≤ 35 CFU/100mLall year102
Enterococcidaily maximum≤ 104 CFU/100mLall year102
BOD, 5-day, 20 deg. Cdaily maximum≤ 65 mg/Lall year202
Solids, total suspendeddaily maximum≤ 65 mg/Lall year202
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year202
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year202
Chlorine, total residualmonthly minimum≥ 1 mg/Lall year202
Enterococcidaily average≤ 35 CFU/100mLall year202
Enterococcidaily maximum≤ 104 CFU/100mLall year202
Whole effluent toxicity - retest #17-day minimumreport only (pass=0;fail=1)all yearTX1
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 #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 #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 - retest #2monthly average minimumreport only (pass=0;fail=1)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 menidia7-day minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidiamonthly 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 menidia7-day minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Menidia menidiamonthly 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 menidia7-day minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidiamonthly 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 menidia7-day minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia menidiamonthly 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 menidia7-day minimumreport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia menidiamonthly 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 Reproduction Static Renewal 7 Day Chronic Menidia menidia7-day minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidiamonthly 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 menidiasingle samplereport only (pass=0;fail=1)all yearTXA

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/TX0104876 · MCP: https://passage-data.com/mcp