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SI Group Inc.

Industrial Organic Chemicals, major discharger, Orangeburg, South Carolina. NPDES permit SC0001180, in force until Dec 31, 2030. Last 12 months: over a limit 3 times (last October 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: form 1 monthly (19 values), form 2 every 60 months, form 3 yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 18 reports late

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

Period endingParameterReportedLimitOver by
October 2025Solids, total suspended, daily maximum3806.4≤ 971 lb/d292%
October 2025Solids, total suspended, daily maximum440≤ 183 mg/L140%
October 2025Solids, total suspended, monthly average607.9≤ 315 lb/d93%

Limits in force (247)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 2 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 106 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 131 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 339 lb/dall year
pHinstantaneous minimumreport only (SU)all year
pHinstantaneous maximumreport only (SU)all year
Solids, total suspendeddaily maximum≤ 183 mg/Lall year
Solids, total suspendedmonthly average≤ 213 lb/dall year
Solids, total suspendeddaily maximum≤ 550 lb/dall year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Carbon tetrachloridemonthly average≤ .018 mg/Lall year
Carbon tetrachloridedaily maximum≤ .038 mg/Lall year
Carbon tetrachloridemonthly average≤ .05 lb/dall year
Carbon tetrachloridedaily maximum≤ .106 lb/dall year
1,2-Dichloroethanemonthly average≤ .068 mg/Lall year
1,2-Dichloroethanedaily maximum≤ .211 mg/Lall year
1,2-Dichloroethanemonthly average≤ .19 lb/dall year
1,2-Dichloroethanedaily maximum≤ .59 lb/dall year
Chloroformmonthly average≤ .021 mg/Lall year
Chloroformdaily maximum≤ .046 mg/Lall year
Chloroformmonthly average≤ .059 lb/dall year
Chloroformdaily maximum≤ .129 lb/dall year
Toluenemonthly average≤ .026 mg/Lall year
Toluenedaily maximum≤ .08 mg/Lall year
Toluenemonthly average≤ .073 lb/dall year
Toluenedaily maximum≤ .224 lb/dall year
Benzenemonthly average≤ .037 mg/Lall year
Benzenedaily maximum≤ .136 mg/Lall year
Benzenemonthly average≤ .103 lb/dall year
Benzenedaily maximum≤ .38 lb/dall year
Acenaphthylenemonthly average≤ .022 mg/Lall year
Acenaphthylenedaily maximum≤ .059 mg/Lall year
Acenaphthylenemonthly average≤ .062 lb/dall year
Acenaphthylenedaily maximum≤ .165 lb/dall year
Acenaphthenemonthly average≤ .022 mg/Lall year
Acenaphthenedaily maximum≤ .059 mg/Lall year
Acenaphthenemonthly average≤ .062 lb/dall year
Acenaphthenedaily maximum≤ .165 lb/dall year
Acrylonitrilemonthly average≤ .096 mg/Lall year
Acrylonitriledaily maximum≤ .103 mg/Lall year
Acrylonitrilemonthly average≤ .268 lb/dall year
Acrylonitriledaily maximum≤ .677 lb/dall year
Anthracenemonthly average≤ .022 mg/Lall year
Anthracenedaily maximum≤ .043 mg/Lall year
Anthracenemonthly average≤ .062 lb/dall year
Anthracenedaily maximum≤ .165 lb/dall year
Benzo[k]fluoranthenemonthly average≤ .008 mg/Lall year
Benzo[k]fluoranthenedaily maximum≤ .011 mg/Lall year
Benzo[k]fluoranthenemonthly average≤ .062 lb/dall year
Benzo[k]fluoranthenedaily maximum≤ .165 lb/dall year
Benzo[a]pyrenemonthly average≤ .008 mg/Lall year
Benzo[a]pyrenedaily maximum≤ .011 mg/Lall year
Benzo[a]pyrenemonthly average≤ .0064 lb/dall year
Benzo[a]pyrenedaily maximum≤ .171 lb/dall year
Chlorobenzenemonthly average≤ .015 mg/Lall year
Chlorobenzenedaily maximum≤ .028 mg/Lall year
Chlorobenzenemonthly average≤ .042 lb/dall year
Chlorobenzenedaily maximum≤ .078 lb/dall year
Chrysenemonthly average≤ .008 mg/Lall year
Chrysenedaily maximum≤ .011 mg/Lall year
Chrysenemonthly average≤ .062 lb/dall year
Chrysenedaily maximum≤ .165 lb/dall year
Diethyl phthalatemonthly average≤ .081 mg/Lall year
Diethyl phthalatedaily maximum≤ .203 mg/Lall year
Diethyl phthalatemonthly average≤ .226 lb/dall year
Diethyl phthalatedaily maximum≤ .568 lb/dall year
Dimethyl phthalatemonthly average≤ .019 mg/Lall year
Dimethyl phthalatedaily maximum≤ .047 mg/Lall year
Dimethyl phthalatemonthly average≤ .053 lb/dall year
Dimethyl phthalatedaily maximum≤ .131 lb/dall year
Ethylbenzenemonthly average≤ .032 mg/Lall year
Ethylbenzenedaily maximum≤ .108 mg/Lall year
Ethylbenzenemonthly average≤ .089 lb/dall year
Ethylbenzenedaily maximum≤ .302 lb/dall year
Fluoranthenemonthly average≤ .025 mg/Lall year
Fluoranthenedaily maximum≤ .068 mg/Lall year
Fluoranthenemonthly average≤ .07 lb/dall year
Fluoranthenedaily maximum≤ .19 lb/dall year
Fluorenemonthly average≤ .022 mg/Lall year
Fluorenedaily maximum≤ .059 mg/Lall year
Fluorenemonthly average≤ .062 lb/dall year
Fluorenedaily maximum≤ .165 lb/dall year
Hexachloroethanemonthly average≤ .021 mg/Lall year
Hexachloroethanedaily maximum≤ .054 mg/Lall year
Hexachloroethanemonthly average≤ .059 lb/dall year
Hexachloroethanedaily maximum≤ .151 lb/dall year
Methyl chloride [Chloromethane]monthly average≤ .086 mg/Lall year
Methyl chloride [Chloromethane]daily maximum≤ .19 mg/Lall year
Methyl chloride [Chloromethane]monthly average≤ .24 lb/dall year
Methyl chloride [Chloromethane]daily maximum≤ .531 lb/dall year
Methylene chloridemonthly average≤ .04 mg/Lall year
Methylene chloridedaily maximum≤ .089 mg/Lall year
Methylene chloridemonthly average≤ .112 lb/dall year
Methylene chloridedaily maximum≤ .249 lb/dall year
Nitrobenzenemonthly average≤ .027 mg/Lall year
Nitrobenzenedaily maximum≤ .068 mg/Lall year
Nitrobenzenemonthly average≤ .075 lb/dall year
Nitrobenzenedaily maximum≤ .19 lb/dall year
Phenanthrenemonthly average≤ .022 mg/Lall year
Phenanthrenedaily maximum≤ .059 mg/Lall year
Phenanthrenemonthly average≤ .062 lb/dall year
Phenanthrenedaily maximum≤ .165 lb/dall year
Pyrenemonthly average≤ .021 mg/Lall year
Pyrenedaily maximum≤ .042 mg/Lall year
Pyrenemonthly average≤ .07 lb/dall year
Pyrenedaily maximum≤ .187 lb/dall year
Tetrachloroethylenemonthly average≤ .022 mg/Lall year
Tetrachloroethylenedaily maximum≤ .056 mg/Lall year
Tetrachloroethylenemonthly average≤ .062 lb/dall year
Tetrachloroethylenedaily maximum≤ .157 lb/dall year
1,1-Dichloroethanemonthly average≤ .022 mg/Lall year
1,1-Dichloroethanedaily maximum≤ .059 mg/Lall year
1,1-Dichloroethanemonthly average≤ .062 lb/dall year
1,1-Dichloroethanedaily maximum≤ .165 lb/dall year
1,1,1-Trichloroethanemonthly average≤ .021 mg/Lall year
1,1,1-Trichloroethanedaily maximum≤ .054 mg/Lall year
1,1,1-Trichloroethanemonthly average≤ .059 lb/dall year
1,1,1-Trichloroethanedaily maximum≤ .151 lb/dall year
1,1,2-Trichloroethanemonthly average≤ .021 mg/Lall year
1,1,2-Trichloroethanedaily maximum≤ .054 mg/Lall year
1,1,2-Trichloroethanemonthly average≤ .059 lb/dall year
1,1,2-Trichloroethanedaily maximum≤ .151 lb/dall year
Benzo[a]anthracenemonthly average≤ .008 mg/Lall year
Benzo[a]anthracenedaily maximum≤ .011 mg/Lall year
Benzo[a]anthracenemonthly average≤ .062 lb/dall year
Benzo[a]anthracenedaily maximum≤ .165 lb/dall year
1,2-Dichlorobenzenemonthly average≤ .077 mg/Lall year
1,2-Dichlorobenzenedaily maximum≤ .163 mg/Lall year
1,2-Dichlorobenzenemonthly average≤ .215 lb/dall year
1,2-Dichlorobenzenedaily maximum≤ .456 lb/dall year
1,2-Dichloropropanemonthly average≤ .153 mg/Lall year
1,2-Dichloropropanedaily maximum≤ .23 mg/Lall year
1,2-Dichloropropanemonthly average≤ .428 lb/dall year
1,2-Dichloropropanedaily maximum≤ .643 lb/dall year
trans-1,2-Dichloroethylenemonthly average≤ .021 mg/Lall year
trans-1,2-Dichloroethylenedaily maximum≤ .054 mg/Lall year
trans-1,2-Dichloroethylenemonthly average≤ .059 lb/dall year
trans-1,2-Dichloroethylenedaily maximum≤ .151 lb/dall year
1,2,4-Trichlorobenzenemonthly average≤ .068 mg/Lall year
1,2,4-Trichlorobenzenedaily maximum≤ .14 mg/Lall year
1,2,4-Trichlorobenzenemonthly average≤ .19 lb/dall year
1,2,4-Trichlorobenzenedaily maximum≤ .391 lb/dall year
1,3-Dichlorobenzenemonthly average≤ .031 mg/Lall year
1,3-Dichlorobenzenedaily maximum≤ .044 mg/Lall year
1,3-Dichlorobenzenemonthly average≤ .087 lb/dall year
1,3-Dichlorobenzenedaily maximum≤ .123 lb/dall year
1,4-Dichlorobenzenemonthly average≤ .015 mg/Lall year
1,4-Dichlorobenzenedaily maximum≤ .028 mg/Lall year
1,4-Dichlorobenzenemonthly average≤ .042 lb/dall year
1,4-Dichlorobenzenedaily maximum≤ .078 lb/dall year
2-Chlorophenolmonthly average≤ .031 mg/Lall year
2-Chlorophenoldaily maximum≤ .088 mg/Lall year
2-Chlorophenolmonthly average≤ .087 lb/dall year
2-Chlorophenoldaily maximum≤ .274 lb/dall year
2-Nitrophenolmonthly average≤ .041 mg/Lall year
2-Nitrophenoldaily maximum≤ .069 mg/Lall year
2-Nitrophenolmonthly average≤ .115 lb/dall year
2-Nitrophenoldaily maximum≤ .193 lb/dall year
2,4-Dichlorophenolmonthly average≤ .039 mg/Lall year
2,4-Dichlorophenoldaily maximum≤ .112 mg/Lall year
2,4-Dichlorophenolmonthly average≤ .109 lb/dall year
2,4-Dichlorophenoldaily maximum≤ .313 lb/dall year
2,4-Dimethylphenolmonthly average≤ .018 mg/Lall year
2,4-Dimethylphenoldaily maximum≤ .036 mg/Lall year
2,4-Dimethylphenolmonthly average≤ .05 lb/dall year
2,4-Dimethylphenoldaily maximum≤ .101 lb/dall year
2,4-Dinitrotoluenemonthly average≤ .113 mg/Lall year
2,4-Dinitrotoluenedaily maximum≤ .285 mg/Lall year
2,4-Dinitrotoluenemonthly average≤ .316 lb/dall year
2,4-Dinitrotoluenedaily maximum≤ .797 lb/dall year
2,4-Dinitrophenolmonthly average≤ .071 mg/Lall year
2,4-Dinitrophenoldaily maximum≤ .123 mg/Lall year
2,4-Dinitrophenolmonthly average≤ .198 lb/dall year
2,4-Dinitrophenoldaily maximum≤ .344 lb/dall year
2,6-Dinitrotoluenemonthly average≤ .255 mg/Lall year
2,6-Dinitrotoluenedaily maximum≤ .641 mg/Lall year
2,6-Dinitrotoluenemonthly average≤ .713 lb/dall year
2,6-Dinitrotoluenedaily maximum≤ 1.792 lb/dall year
4-Nitrophenolmonthly average≤ .072 mg/Lall year
4-Nitrophenoldaily maximum≤ .124 mg/Lall year
4-Nitrophenolmonthly average≤ .201 lb/dall year
4-Nitrophenoldaily maximum≤ .347 lb/dall year
4,6-Dinitro-o-cresolmonthly average≤ .078 mg/Lall year
4,6-Dinitro-o-cresoldaily maximum≤ .277 mg/Lall year
4,6-Dinitro-o-cresolmonthly average≤ .218 lb/dall year
4,6-Dinitro-o-cresoldaily maximum≤ .774 lb/dall year
Phenolmonthly average≤ .015 mg/Lall year
Phenoldaily maximum≤ .026 mg/Lall year
Phenolmonthly average≤ .042 lb/dall year
Phenoldaily maximum≤ .073 lb/dall year
Naphthalenemonthly average≤ .022 mg/Lall year
Naphthalenedaily maximum≤ .059 mg/Lall year
Naphthalenemonthly average≤ .062 lb/dall year
Naphthalenedaily maximum≤ .165 lb/dall year
Di[2-ethylhexyl] phthalate [DEHP]monthly average≤ .103 mg/Lall year
Di[2-ethylhexyl] phthalate [DEHP]daily maximum≤ .279 mg/Lall year
Di[2-ethylhexyl] phthalate [DEHP]monthly average≤ .288 lb/dall year
Di[2-ethylhexyl] phthalate [DEHP]daily maximum≤ .78 lb/dall year
Di-n-butyl phthalatemonthly average≤ .027 mg/Lall year
Di-n-butyl phthalatedaily maximum≤ .057 mg/Lall year
Di-n-butyl phthalatemonthly average≤ .075 lb/dall year
Di-n-butyl phthalatedaily maximum≤ .159 lb/dall year
Vinyl chloridemonthly average≤ .05 mg/Lall year
Vinyl chloridedaily maximum≤ .056 mg/Lall year
Vinyl chloridemonthly average≤ .291 lb/dall year
Vinyl chloridedaily maximum≤ .749 lb/dall year
Trichloroethylenemonthly average≤ .021 mg/Lall year
Trichloroethylenedaily maximum≤ .054 mg/Lall year
Trichloroethylenemonthly average≤ .059 lb/dall year
Trichloroethylenedaily maximum≤ .151 lb/dall year
Hexachlorobenzenemonthly average≤ .0002 mg/Lall year
Hexachlorobenzenedaily maximum≤ .0003 mg/Lall year
Hexachlorobenzenemonthly average≤ .034 lb/dall year
Hexachlorobenzenedaily maximum≤ .069 lb/dall year
Hexachlorobutadienemonthly average≤ .02 mg/Lall year
Hexachlorobutadienedaily maximum≤ .049 mg/Lall year
Hexachlorobutadienemonthly average≤ .056 lb/dall year
Hexachlorobutadienedaily maximum≤ .137 lb/dall year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
E. coli30-day geometric mean≤ 126 #/100mLall year
E. colidaily maximum≤ 349 #/100mLall year
1,1-Dichloroethenemonthly average≤ .016 mg/Lall year
1,1-Dichloroethenedaily maximum≤ .025 mg/Lall year
1,1-Dichloroethenemonthly average≤ .045 lb/dall year
1,1-Dichloroethenedaily maximum≤ .07 lb/dall year
Mercury, total [as Hg]monthly averagereport only (ug/L)all year
Mercury, total [as Hg]daily maximumreport only (ug/L)all year
Length of longest pH excursioninstantaneous maximum≤ 60 minall year
1,3-Dichloropropenemonthly average≤ .029 mg/Lall year
1,3-Dichloropropenedaily maximum≤ .044 mg/Lall year
1,3-Dichloropropenemonthly average≤ .081 lb/dall year
1,3-Dichloropropenedaily maximum≤ .123 lb/dall year
3,4-Benzofluoranthenemonthly average≤ .008 mg/Lall year
3,4-Benzofluoranthenedaily maximum≤ .011 mg/Lall year
3,4-Benzofluoranthenemonthly average≤ .064 lb/dall year
3,4-Benzofluoranthenedaily maximum≤ .171 lb/dall year
pH range excursions, monthly total accummonthly maximum≤ 446 minall year
Chloroethanemonthly average≤ .104 mg/Lall year
Chloroethanedaily maximum≤ .268 mg/Lall year
Chloroethanemonthly average≤ .291 lb/dall year
Chloroethanedaily maximum≤ .749 lb/dall year
LC50 Static 48Hr Acute Ceriodaphnia dubiadaily minimumreport only (%)all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly averagereport only (%)all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily maximumreport only (%)all year
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily minimumreport only (%)all year

New limits from Feb 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Mercury, total [as Hg], daily maximum0.073 ug/Lnew0.0156 ug/L (8 values)0.214×
Mercury, total [as Hg], monthly average0.05 ug/Lnew0.01435 ug/L (8 values)0.287×

How strict are these limits?

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

Same industry: the 24 Chemicals and Allied Products permits in South Carolina.

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