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Shin-Etsu Silicones of America Inc

Industrial Organic Chemicals, major discharger, Freeport, Texas. NPDES permit TX0124427, in force until Sep 24, 2029. Last 12 months: over a limit once (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (24 values), form Y yearly (224 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 13 reports late

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

Period endingParameterReportedLimitOver by
May 2026Enterococci, daily average79 CFU/100mL≤ 35 CFU/100mL126%

Limits in force (248)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. Cdaily averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year
BOD, 5-day, 20 deg. Cdaily average≤ 142 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 375 lb/dall year
Oxygen demand, chem. [high level] [COD]daily averagereport only (mg/L)all year
Oxygen demand, chem. [high level] [COD]daily maximumreport only (mg/L)all year
Oxygen demand, chem. [high level] [COD]daily averagereport only (lb/d)all year
Oxygen demand, chem. [high level] [COD]daily maximumreport only (lb/d)all year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendeddaily averagereport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspendeddaily average≤ 185 lb/dall year
Solids, total suspendeddaily maximum≤ 585 lb/dall year
Nitrogen, ammonia total [as N]daily averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]daily averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]daily maximumreport only (lb/d)all year
Silica, dissolved [as SiO2]daily maximumreport only (mg/L)all year
Silica, dissolved [as SiO2]daily maximumreport only (lb/d)all year
Carbon tetrachloridedaily averagereport only (mg/L)all year
Carbon tetrachloridedaily maximumreport only (mg/L)all year
Carbon tetrachloridedaily average≤ .055 lb/dall year
Carbon tetrachloridedaily maximum≤ .116 lb/dall year
1,2-Dichloroethanedaily averagereport only (mg/L)all year
1,2-Dichloroethanedaily maximumreport only (mg/L)all year
1,2-Dichloroethanedaily average≤ .208 lb/dall year
1,2-Dichloroethanedaily maximum≤ .646 lb/dall year
Chloroformdaily averagereport only (mg/L)all year
Chloroformdaily maximumreport only (mg/L)all year
Chloroformdaily average≤ .064 lb/dall year
Chloroformdaily maximum≤ .141 lb/dall year
Toluenedaily averagereport only (mg/L)all year
Toluenedaily maximumreport only (mg/L)all year
Toluenedaily average≤ .08 lb/dall year
Toluenedaily maximum≤ .245 lb/dall year
Benzenedaily averagereport only (mg/L)all year
Benzenedaily maximumreport only (mg/L)all year
Benzenedaily average≤ .113 lb/dall year
Benzenedaily maximum≤ .416 lb/dall year
Acenaphthylenedaily averagereport only (mg/L)all year
Acenaphthylenedaily maximumreport only (mg/L)all year
Acenaphthylenedaily average≤ .067 lb/dall year
Acenaphthylenedaily maximum≤ .181 lb/dall year
Acenaphthenedaily averagereport only (mg/L)all year
Acenaphthenedaily maximumreport only (mg/L)all year
Acenaphthenedaily average≤ .067 lb/dall year
Acenaphthenedaily maximum≤ .19 lb/dall year
Acrylonitriledaily averagereport only (mg/L)all year
Acrylonitriledaily maximumreport only (mg/L)all year
Acrylonitriledaily average≤ .294 lb/dall year
Acrylonitriledaily maximum≤ .741 lb/dall year
Anthracenedaily averagereport only (mg/L)all year
Anthracenedaily maximumreport only (mg/L)all year
Anthracenedaily average≤ .067 lb/dall year
Anthracenedaily maximum≤ .181 lb/dall year
Benzo[k]fluoranthenedaily averagereport only (mg/L)all year
Benzo[k]fluoranthenedaily maximumreport only (mg/L)all year
Benzo[k]fluoranthenedaily average≤ .067 lb/dall year
Benzo[k]fluoranthenedaily maximum≤ .181 lb/dall year
Benzo[a]pyrenedaily averagereport only (mg/L)all year
Benzo[a]pyrenedaily maximumreport only (mg/L)all year
Benzo[a]pyrenedaily average≤ .07 lb/dall year
Benzo[a]pyrenedaily maximum≤ .187 lb/dall year
Chlorobenzenedaily averagereport only (mg/L)all year
Chlorobenzenedaily maximumreport only (mg/L)all year
Chlorobenzenedaily average≤ .046 lb/dall year
Chlorobenzenedaily maximum≤ .86 lb/dall year
Chrysenedaily averagereport only (mg/L)all year
Chrysenedaily maximumreport only (mg/L)all year
Chrysenedaily average≤ .067 lb/dall year
Chrysenedaily maximum≤ .181 lb/dall year
Diethyl phthalatedaily averagereport only (mg/L)all year
Diethyl phthalatedaily maximumreport only (mg/L)all year
Diethyl phthalatedaily average≤ .248 lb/dall year
Diethyl phthalatedaily maximum≤ .621 lb/dall year
Dimethyl phthalatedaily averagereport only (mg/L)all year
Dimethyl phthalatedaily maximumreport only (mg/L)all year
Dimethyl phthalatedaily average≤ .058 lb/dall year
Dimethyl phthalatedaily maximum≤ .144 lb/dall year
Ethylbenzenedaily averagereport only (mg/L)all year
Ethylbenzenedaily maximumreport only (mg/L)all year
Ethylbenzenedaily average≤ .098 lb/dall year
Ethylbenzenedaily maximum≤ .33 lb/dall year
Fluoranthenedaily averagereport only (mg/L)all year
Fluoranthenedaily maximumreport only (mg/L)all year
Fluoranthenedaily average≤ .077 lb/dall year
Fluoranthenedaily maximum≤ .208 lb/dall year
Fluorenedaily averagereport only (mg/L)all year
Fluorenedaily maximumreport only (mg/L)all year
Fluorenedaily average≤ .067 lb/dall year
Fluorenedaily maximum≤ .181 lb/dall year
Hexachlorobutadienedaily averagereport only (mg/L)all year
Hexachlorobutadienedaily maximumreport only (mg/L)all year
Hexachlorobutadienedaily average≤ .061 lb/dall year
Hexachlorobutadienedaily maximum≤ .15 lb/dall year
Hexachloroethanedaily averagereport only (mg/L)all year
Hexachloroethanedaily maximumreport only (mg/L)all year
Hexachloroethanedaily average≤ .064 lb/dall year
Hexachloroethanedaily maximum≤ .165 lb/dall year
Methyl chloride [Chloromethane]daily averagereport only (mg/L)all year
Methyl chloride [Chloromethane]daily maximumreport only (mg/L)all year
Methyl chloride [Chloromethane]daily average≤ .263 lb/dall year
Methyl chloride [Chloromethane]daily maximum≤ .581 lb/dall year
Methylene chloridedaily averagereport only (mg/L)all year
Methylene chloridedaily maximumreport only (mg/L)all year
Methylene chloridedaily average≤ .122 lb/dall year
Methylene chloridedaily maximum≤ .272 lb/dall year
Nitrobenzenedaily averagereport only (mg/L)all year
Nitrobenzenedaily maximumreport only (mg/L)all year
Nitrobenzenedaily average≤ .083 lb/dall year
Nitrobenzenedaily maximum≤ .208 lb/dall year
Phenanthrenedaily averagereport only (mg/L)all year
Phenanthrenedaily maximumreport only (mg/L)all year
Phenanthrenedaily average≤ .067 lb/dall year
Phenanthrenedaily maximum≤ .181 lb/dall year
Pyrenedaily averagereport only (mg/L)all year
Pyrenedaily maximumreport only (mg/L)all year
Pyrenedaily average≤ .077 lb/dall year
Pyrenedaily maximum≤ .205 lb/dall year
Tetrachloroethylenedaily averagereport only (mg/L)all year
Tetrachloroethylenedaily maximumreport only (mg/L)all year
Tetrachloroethylenedaily average≤ .067 lb/dall year
Tetrachloroethylenedaily maximum≤ .171 lb/dall year
1,1-Dichloroethanedaily averagereport only (mg/L)all year
1,1-Dichloroethanedaily maximumreport only (mg/L)all year
1,1-Dichloroethanedaily average≤ .067 lb/dall year
1,1-Dichloroethanedaily maximum≤ .181 lb/dall year
1,1-Dichloroethylenedaily averagereport only (mg/L)all year
1,1-Dichloroethylenedaily maximumreport only (mg/L)all year
1,1-Dichloroethylenedaily average≤ .049 lb/dall year
1,1-Dichloroethylenedaily maximum≤ .077 lb/dall year
1,1,1-Trichloroethanedaily averagereport only (mg/L)all year
1,1,1-Trichloroethanedaily maximumreport only (mg/L)all year
1,1,1-Trichloroethanedaily average≤ .064 lb/dall year
1,1,1-Trichloroethanedaily maximum≤ .165 lb/dall year
1,1,2-Trichloroethanedaily averagereport only (mg/L)all year
1,1,2-Trichloroethanedaily maximumreport only (mg/L)all year
1,1,2-Trichloroethanedaily average≤ .064 lb/dall year
1,1,2-Trichloroethanedaily maximum≤ .165 lb/dall year
Benzo[a]anthracenedaily averagereport only (mg/L)all year
Benzo[a]anthracenedaily maximumreport only (mg/L)all year
Benzo[a]anthracenedaily average≤ .067 lb/dall year
Benzo[a]anthracenedaily maximum≤ .181 lb/dall year
1,2-Dichlorobenzenedaily averagereport only (mg/L)all year
1,2-Dichlorobenzenedaily maximumreport only (mg/L)all year
1,2-Dichlorobenzenedaily average≤ .236 lb/dall year
1,2-Dichlorobenzenedaily maximum≤ .499 lb/dall year
1,2-Dichloropropanedaily averagereport only (mg/L)all year
1,2-Dichloropropanedaily maximumreport only (mg/L)all year
1,2-Dichloropropanedaily average≤ .468 lb/dall year
1,2-Dichloropropanedaily maximum≤ .704 lb/dall year
trans-1,2-Dichloroethylenedaily averagereport only (mg/L)all year
trans-1,2-Dichloroethylenedaily maximumreport only (mg/L)all year
trans-1,2-Dichloroethylenedaily average≤ .064 lb/dall year
trans-1,2-Dichloroethylenedaily maximum≤ .165 lb/dall year
1,2,4-Trichlorobenzenedaily averagereport only (mg/L)all year
1,2,4-Trichlorobenzenedaily maximumreport only (mg/L)all year
1,2,4-Trichlorobenzenedaily average≤ .208 lb/dall year
1,2,4-Trichlorobenzenedaily maximum≤ .428 lb/dall year
1,3-Dichlorobenzenedaily averagereport only (mg/L)all year
1,3-Dichlorobenzenedaily maximumreport only (mg/L)all year
1,3-Dichlorobenzenedaily average≤ .095 lb/dall year
1,3-Dichlorobenzenedaily maximum≤ .135 lb/dall year
1,4-Dichlorobenzenedaily averagereport only (mg/L)all year
1,4-Dichlorobenzenedaily maximumreport only (mg/L)all year
1,4-Dichlorobenzenedaily average≤ .046 lb/dall year
1,4-Dichlorobenzenedaily maximum≤ .086 lb/dall year
2-Chlorophenoldaily averagereport only (mg/L)all year
2-Chlorophenoldaily maximumreport only (mg/L)all year
2-Chlorophenoldaily average≤ .095 lb/dall year
2-Chlorophenoldaily maximum≤ .3 lb/dall year
2-Nitrophenoldaily averagereport only (mg/L)all year
2-Nitrophenoldaily maximumreport only (mg/L)all year
2-Nitrophenoldaily average≤ .125 lb/dall year
2-Nitrophenoldaily maximum≤ .211 lb/dall year
2,4-Dichlorophenoldaily averagereport only (mg/L)all year
2,4-Dichlorophenoldaily maximumreport only (mg/L)all year
2,4-Dichlorophenoldaily average≤ .119 lb/dall year
2,4-Dichlorophenoldaily maximum≤ .343 lb/dall year
2,4-Dimethylphenoldaily averagereport only (mg/L)all year
2,4-Dimethylphenoldaily maximumreport only (mg/L)all year
2,4-Dimethylphenoldaily average≤ .055 lb/dall year
2,4-Dimethylphenoldaily maximum≤ .11 lb/dall year
2,4-Dinitrotoluenedaily averagereport only (mg/L)all year
2,4-Dinitrotoluenedaily maximumreport only (mg/L)all year
2,4-Dinitrotoluenedaily average≤ .346 lb/dall year
2,4-Dinitrotoluenedaily maximum≤ .872 lb/dall year
2,4-Dinitrophenoldaily averagereport only (mg/L)all year
2,4-Dinitrophenoldaily maximumreport only (mg/L)all year
2,4-Dinitrophenoldaily average≤ .217 lb/dall year
2,4-Dinitrophenoldaily maximum≤ .376 lb/dall year
2,6-Dinitrotoluenedaily averagereport only (mg/L)all year
2,6-Dinitrotoluenedaily maximumreport only (mg/L)all year
2,6-Dinitrotoluenedaily average≤ .78 lb/dall year
2,6-Dinitrotoluenedaily maximum≤ 1.962 lb/dall year
4-Nitrophenoldaily averagereport only (mg/L)all year
4-Nitrophenoldaily maximumreport only (mg/L)all year
4-Nitrophenoldaily average≤ .22 lb/dall year
4-Nitrophenoldaily maximum≤ .379 lb/dall year
4,6-Dinitro-o-cresoldaily averagereport only (mg/L)all year
4,6-Dinitro-o-cresoldaily maximumreport only (mg/L)all year
4,6-Dinitro-o-cresoldaily average≤ .239 lb/dall year
4,6-Dinitro-o-cresoldaily maximum≤ .848 lb/dall year
Phenoldaily averagereport only (mg/L)all year
Phenoldaily maximumreport only (mg/L)all year
Phenoldaily average≤ .046 lb/dall year
Phenoldaily maximum≤ .08 lb/dall year
Naphthalenedaily averagereport only (mg/L)all year
Naphthalenedaily maximumreport only (mg/L)all year
Naphthalenedaily average≤ .067 lb/dall year
Naphthalenedaily maximum≤ .181 lb/dall year
Di[2-ethylhexyl] phthalate [DEHP]daily averagereport only (mg/L)all year
Di[2-ethylhexyl] phthalate [DEHP]daily maximumreport only (mg/L)all year
Di[2-ethylhexyl] phthalate [DEHP]daily average≤ .315 lb/dall year
Di[2-ethylhexyl] phthalate [DEHP]daily maximum≤ .854 lb/dall year
Di-n-butyl phthalatedaily averagereport only (mg/L)all year
Di-n-butyl phthalatedaily maximumreport only (mg/L)all year
Di-n-butyl phthalatedaily average≤ .083 lb/dall year
Di-n-butyl phthalatedaily maximum≤ .174 lb/dall year
Vinyl chloridedaily averagereport only (mg/L)all year
Vinyl chloridedaily maximumreport only (mg/L)all year
Vinyl chloridedaily average≤ .318 lb/dall year
Vinyl chloridedaily maximum≤ .82 lb/dall year
Trichloroethylenedaily averagereport only (mg/L)all year
Trichloroethylenedaily maximumreport only (mg/L)all year
Trichloroethylenedaily average≤ .064 lb/dall year
Trichloroethylenedaily maximum≤ .165 lb/dall year
Hexachlorobenzenedaily averagereport only (mg/L)all year
Hexachlorobenzenedaily maximumreport only (mg/L)all year
Hexachlorobenzenedaily average≤ .046 lb/dall year
Hexachlorobenzenedaily maximum≤ .086 lb/dall year
Flow, in conduit or thru treatment plantdaily average≤ .7 MGDall year
Flow, in conduit or thru treatment plantdaily maximum≤ 1 MGDall year
1,3-Dichloropropylenedaily averagereport only (mg/L)all year
1,3-Dichloropropylenedaily maximumreport only (mg/L)all year
1,3-Dichloropropylenedaily average≤ .089 lb/dall year
1,3-Dichloropropylenedaily maximum≤ .135 lb/dall year
Enterococcidaily average≤ 35 CFU/100mLall year
Enterococcidaily maximum≤ 130 CFU/100mLall year
3,4-Benzofluoranthenedaily averagereport only (mg/L)all year
3,4-Benzofluoranthenedaily maximumreport only (mg/L)all year
3,4-Benzofluoranthenedaily average≤ .07 lb/dall year
3,4-Benzofluoranthenedaily maximum≤ .187 lb/dall year
Chloroethanedaily averagereport only (mg/L)all year
Chloroethanedaily maximumreport only (mg/L)all year
Chloroethanedaily average≤ .318 lb/dall year
Chloroethanedaily maximum≤ .82 lb/dall year

New limits from Oct 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], daily average70 lb/dnew9.095 lb/d (12 values)0.13×
Nitrogen, ammonia total [as N], daily average12 mg/Lnew2.845 mg/L (12 values)0.237×
Nitrogen, ammonia total [as N], daily maximum140 lb/dnew29.4 lb/d (12 values)0.21×
Nitrogen, ammonia total [as N], daily maximum24 mg/Lnew9.315 mg/L (12 values)0.388×

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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