SI Group Inc.

NPDES permit SC0001180 · Major NON-POTW · effective, expires 2030-12-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

EPA's record, 2025-09-01 to 2026-08-31

3values over a limit
0required values missing, on 0 form(s)
0of 12 forms filed late

Last period with anything received: 2026-07-31. Most often over: Solids, total suspended (3).

Reporting

Reports are due about 29 days after each monitoring period ends (the most common figure among SC permits in EPA's filings — check your permit).

Limits in force (247)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]INST MIN >= 2 mg/L all year
001BOD, 5-day, 20 deg. CDAILY MX <= 106 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 131 lb/d all year
001BOD, 5-day, 20 deg. CDAILY MX <= 339 lb/d all year
001pHINST MIN report only all year
001pHINST MAX report only all year
001Solids, total suspendedDAILY MX <= 183 mg/L all year
001Solids, total suspendedMO AVG <= 213 lb/d all year
001Solids, total suspendedDAILY MX <= 550 lb/d all year
001Nitrogen, ammonia total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]DAILY MX report only all year
001Carbon tetrachlorideMO AVG <= .018 mg/L all year
001Carbon tetrachlorideDAILY MX <= .038 mg/L all year
001Carbon tetrachlorideMO AVG <= .05 lb/d all year
001Carbon tetrachlorideDAILY MX <= .106 lb/d all year
0011,2-DichloroethaneMO AVG <= .068 mg/L all year
0011,2-DichloroethaneDAILY MX <= .211 mg/L all year
0011,2-DichloroethaneMO AVG <= .19 lb/d all year
0011,2-DichloroethaneDAILY MX <= .59 lb/d all year
001ChloroformMO AVG <= .021 mg/L all year
001ChloroformDAILY MX <= .046 mg/L all year
001ChloroformMO AVG <= .059 lb/d all year
001ChloroformDAILY MX <= .129 lb/d all year
001TolueneMO AVG <= .026 mg/L all year
001TolueneDAILY MX <= .08 mg/L all year
001TolueneMO AVG <= .073 lb/d all year
001TolueneDAILY MX <= .224 lb/d all year
001BenzeneMO AVG <= .037 mg/L all year
001BenzeneDAILY MX <= .136 mg/L all year
001BenzeneMO AVG <= .103 lb/d all year
001BenzeneDAILY MX <= .38 lb/d all year
001AcenaphthyleneMO AVG <= .022 mg/L all year
001AcenaphthyleneDAILY MX <= .059 mg/L all year
001AcenaphthyleneMO AVG <= .062 lb/d all year
001AcenaphthyleneDAILY MX <= .165 lb/d all year
001AcenaphtheneMO AVG <= .022 mg/L all year
001AcenaphtheneDAILY MX <= .059 mg/L all year
001AcenaphtheneMO AVG <= .062 lb/d all year
001AcenaphtheneDAILY MX <= .165 lb/d all year
001AcrylonitrileMO AVG <= .096 mg/L all year
001AcrylonitrileDAILY MX <= .103 mg/L all year
001AcrylonitrileMO AVG <= .268 lb/d all year
001AcrylonitrileDAILY MX <= .677 lb/d all year
001AnthraceneMO AVG <= .022 mg/L all year
001AnthraceneDAILY MX <= .043 mg/L all year
001AnthraceneMO AVG <= .062 lb/d all year
001AnthraceneDAILY MX <= .165 lb/d all year
001Benzo[k]fluorantheneMO AVG <= .008 mg/L all year
001Benzo[k]fluorantheneDAILY MX <= .011 mg/L all year
001Benzo[k]fluorantheneMO AVG <= .062 lb/d all year
001Benzo[k]fluorantheneDAILY MX <= .165 lb/d all year
001Benzo[a]pyreneMO AVG <= .008 mg/L all year
001Benzo[a]pyreneDAILY MX <= .011 mg/L all year
001Benzo[a]pyreneMO AVG <= .0064 lb/d all year
001Benzo[a]pyreneDAILY MX <= .171 lb/d all year
001ChlorobenzeneMO AVG <= .015 mg/L all year
001ChlorobenzeneDAILY MX <= .028 mg/L all year
001ChlorobenzeneMO AVG <= .042 lb/d all year
001ChlorobenzeneDAILY MX <= .078 lb/d all year
001ChryseneMO AVG <= .008 mg/L all year
001ChryseneDAILY MX <= .011 mg/L all year
001ChryseneMO AVG <= .062 lb/d all year
001ChryseneDAILY MX <= .165 lb/d all year
001Diethyl phthalateMO AVG <= .081 mg/L all year
001Diethyl phthalateDAILY MX <= .203 mg/L all year
001Diethyl phthalateMO AVG <= .226 lb/d all year
001Diethyl phthalateDAILY MX <= .568 lb/d all year
001Dimethyl phthalateMO AVG <= .019 mg/L all year
001Dimethyl phthalateDAILY MX <= .047 mg/L all year
001Dimethyl phthalateMO AVG <= .053 lb/d all year
001Dimethyl phthalateDAILY MX <= .131 lb/d all year
001EthylbenzeneMO AVG <= .032 mg/L all year
001EthylbenzeneDAILY MX <= .108 mg/L all year
001EthylbenzeneMO AVG <= .089 lb/d all year
001EthylbenzeneDAILY MX <= .302 lb/d all year
001FluorantheneMO AVG <= .025 mg/L all year
001FluorantheneDAILY MX <= .068 mg/L all year
001FluorantheneMO AVG <= .07 lb/d all year
001FluorantheneDAILY MX <= .19 lb/d all year
001FluoreneMO AVG <= .022 mg/L all year
001FluoreneDAILY MX <= .059 mg/L all year
001FluoreneMO AVG <= .062 lb/d all year
001FluoreneDAILY MX <= .165 lb/d all year
001HexachloroethaneMO AVG <= .021 mg/L all year
001HexachloroethaneDAILY MX <= .054 mg/L all year
001HexachloroethaneMO AVG <= .059 lb/d all year
001HexachloroethaneDAILY MX <= .151 lb/d all year
001Methyl chloride [Chloromethane]MO AVG <= .086 mg/L all year
001Methyl chloride [Chloromethane]DAILY MX <= .19 mg/L all year
001Methyl chloride [Chloromethane]MO AVG <= .24 lb/d all year
001Methyl chloride [Chloromethane]DAILY MX <= .531 lb/d all year
001Methylene chlorideMO AVG <= .04 mg/L all year
001Methylene chlorideDAILY MX <= .089 mg/L all year
001Methylene chlorideMO AVG <= .112 lb/d all year
001Methylene chlorideDAILY MX <= .249 lb/d all year
001NitrobenzeneMO AVG <= .027 mg/L all year
001NitrobenzeneDAILY MX <= .068 mg/L all year
001NitrobenzeneMO AVG <= .075 lb/d all year
001NitrobenzeneDAILY MX <= .19 lb/d all year
001PhenanthreneMO AVG <= .022 mg/L all year
001PhenanthreneDAILY MX <= .059 mg/L all year
001PhenanthreneMO AVG <= .062 lb/d all year
001PhenanthreneDAILY MX <= .165 lb/d all year
001PyreneMO AVG <= .021 mg/L all year
001PyreneDAILY MX <= .042 mg/L all year
001PyreneMO AVG <= .07 lb/d all year
001PyreneDAILY MX <= .187 lb/d all year
001TetrachloroethyleneMO AVG <= .022 mg/L all year
001TetrachloroethyleneDAILY MX <= .056 mg/L all year
001TetrachloroethyleneMO AVG <= .062 lb/d all year
001TetrachloroethyleneDAILY MX <= .157 lb/d all year
0011,1-DichloroethaneMO AVG <= .022 mg/L all year
0011,1-DichloroethaneDAILY MX <= .059 mg/L all year
0011,1-DichloroethaneMO AVG <= .062 lb/d all year
0011,1-DichloroethaneDAILY MX <= .165 lb/d all year
0011,1,1-TrichloroethaneMO AVG <= .021 mg/L all year
0011,1,1-TrichloroethaneDAILY MX <= .054 mg/L all year
0011,1,1-TrichloroethaneMO AVG <= .059 lb/d all year
0011,1,1-TrichloroethaneDAILY MX <= .151 lb/d all year
0011,1,2-TrichloroethaneMO AVG <= .021 mg/L all year
0011,1,2-TrichloroethaneDAILY MX <= .054 mg/L all year
0011,1,2-TrichloroethaneMO AVG <= .059 lb/d all year
0011,1,2-TrichloroethaneDAILY MX <= .151 lb/d all year
001Benzo[a]anthraceneMO AVG <= .008 mg/L all year
001Benzo[a]anthraceneDAILY MX <= .011 mg/L all year
001Benzo[a]anthraceneMO AVG <= .062 lb/d all year
001Benzo[a]anthraceneDAILY MX <= .165 lb/d all year
0011,2-DichlorobenzeneMO AVG <= .077 mg/L all year
0011,2-DichlorobenzeneDAILY MX <= .163 mg/L all year
0011,2-DichlorobenzeneMO AVG <= .215 lb/d all year
0011,2-DichlorobenzeneDAILY MX <= .456 lb/d all year
0011,2-DichloropropaneMO AVG <= .153 mg/L all year
0011,2-DichloropropaneDAILY MX <= .23 mg/L all year
0011,2-DichloropropaneMO AVG <= .428 lb/d all year
0011,2-DichloropropaneDAILY MX <= .643 lb/d all year
001trans-1,2-DichloroethyleneMO AVG <= .021 mg/L all year
001trans-1,2-DichloroethyleneDAILY MX <= .054 mg/L all year
001trans-1,2-DichloroethyleneMO AVG <= .059 lb/d all year
001trans-1,2-DichloroethyleneDAILY MX <= .151 lb/d all year
0011,2,4-TrichlorobenzeneMO AVG <= .068 mg/L all year
0011,2,4-TrichlorobenzeneDAILY MX <= .14 mg/L all year
0011,2,4-TrichlorobenzeneMO AVG <= .19 lb/d all year
0011,2,4-TrichlorobenzeneDAILY MX <= .391 lb/d all year
0011,3-DichlorobenzeneMO AVG <= .031 mg/L all year
0011,3-DichlorobenzeneDAILY MX <= .044 mg/L all year
0011,3-DichlorobenzeneMO AVG <= .087 lb/d all year
0011,3-DichlorobenzeneDAILY MX <= .123 lb/d all year
0011,4-DichlorobenzeneMO AVG <= .015 mg/L all year
0011,4-DichlorobenzeneDAILY MX <= .028 mg/L all year
0011,4-DichlorobenzeneMO AVG <= .042 lb/d all year
0011,4-DichlorobenzeneDAILY MX <= .078 lb/d all year
0012-ChlorophenolMO AVG <= .031 mg/L all year
0012-ChlorophenolDAILY MX <= .088 mg/L all year
0012-ChlorophenolMO AVG <= .087 lb/d all year
0012-ChlorophenolDAILY MX <= .274 lb/d all year
0012-NitrophenolMO AVG <= .041 mg/L all year
0012-NitrophenolDAILY MX <= .069 mg/L all year
0012-NitrophenolMO AVG <= .115 lb/d all year
0012-NitrophenolDAILY MX <= .193 lb/d all year
0012,4-DichlorophenolMO AVG <= .039 mg/L all year
0012,4-DichlorophenolDAILY MX <= .112 mg/L all year
0012,4-DichlorophenolMO AVG <= .109 lb/d all year
0012,4-DichlorophenolDAILY MX <= .313 lb/d all year
0012,4-DimethylphenolMO AVG <= .018 mg/L all year
0012,4-DimethylphenolDAILY MX <= .036 mg/L all year
0012,4-DimethylphenolMO AVG <= .05 lb/d all year
0012,4-DimethylphenolDAILY MX <= .101 lb/d all year
0012,4-DinitrotolueneMO AVG <= .113 mg/L all year
0012,4-DinitrotolueneDAILY MX <= .285 mg/L all year
0012,4-DinitrotolueneMO AVG <= .316 lb/d all year
0012,4-DinitrotolueneDAILY MX <= .797 lb/d all year
0012,4-DinitrophenolMO AVG <= .071 mg/L all year
0012,4-DinitrophenolDAILY MX <= .123 mg/L all year
0012,4-DinitrophenolMO AVG <= .198 lb/d all year
0012,4-DinitrophenolDAILY MX <= .344 lb/d all year
0012,6-DinitrotolueneMO AVG <= .255 mg/L all year
0012,6-DinitrotolueneDAILY MX <= .641 mg/L all year
0012,6-DinitrotolueneMO AVG <= .713 lb/d all year
0012,6-DinitrotolueneDAILY MX <= 1.792 lb/d all year
0014-NitrophenolMO AVG <= .072 mg/L all year
0014-NitrophenolDAILY MX <= .124 mg/L all year
0014-NitrophenolMO AVG <= .201 lb/d all year
0014-NitrophenolDAILY MX <= .347 lb/d all year
0014,6-Dinitro-o-cresolMO AVG <= .078 mg/L all year
0014,6-Dinitro-o-cresolDAILY MX <= .277 mg/L all year
0014,6-Dinitro-o-cresolMO AVG <= .218 lb/d all year
0014,6-Dinitro-o-cresolDAILY MX <= .774 lb/d all year
001PhenolMO AVG <= .015 mg/L all year
001PhenolDAILY MX <= .026 mg/L all year
001PhenolMO AVG <= .042 lb/d all year
001PhenolDAILY MX <= .073 lb/d all year
001NaphthaleneMO AVG <= .022 mg/L all year
001NaphthaleneDAILY MX <= .059 mg/L all year
001NaphthaleneMO AVG <= .062 lb/d all year
001NaphthaleneDAILY MX <= .165 lb/d all year
001Di[2-ethylhexyl] phthalate [DEHP]MO AVG <= .103 mg/L all year
001Di[2-ethylhexyl] phthalate [DEHP]DAILY MX <= .279 mg/L all year
001Di[2-ethylhexyl] phthalate [DEHP]MO AVG <= .288 lb/d all year
001Di[2-ethylhexyl] phthalate [DEHP]DAILY MX <= .78 lb/d all year
001Di-n-butyl phthalateMO AVG <= .027 mg/L all year
001Di-n-butyl phthalateDAILY MX <= .057 mg/L all year
001Di-n-butyl phthalateMO AVG <= .075 lb/d all year
001Di-n-butyl phthalateDAILY MX <= .159 lb/d all year
001Vinyl chlorideMO AVG <= .05 mg/L all year
001Vinyl chlorideDAILY MX <= .056 mg/L all year
001Vinyl chlorideMO AVG <= .291 lb/d all year
001Vinyl chlorideDAILY MX <= .749 lb/d all year
001TrichloroethyleneMO AVG <= .021 mg/L all year
001TrichloroethyleneDAILY MX <= .054 mg/L all year
001TrichloroethyleneMO AVG <= .059 lb/d all year
001TrichloroethyleneDAILY MX <= .151 lb/d all year
001HexachlorobenzeneMO AVG <= .0002 mg/L all year
001HexachlorobenzeneDAILY MX <= .0003 mg/L all year
001HexachlorobenzeneMO AVG <= .034 lb/d all year
001HexachlorobenzeneDAILY MX <= .069 lb/d all year
001HexachlorobutadieneMO AVG <= .02 mg/L all year
001HexachlorobutadieneDAILY MX <= .049 mg/L all year
001HexachlorobutadieneMO AVG <= .056 lb/d all year
001HexachlorobutadieneDAILY MX <= .137 lb/d all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001E. coli30DAVGEO <= 126 #/100mL all year
001E. coliDAILY MX <= 349 #/100mL all year
0011,1-DichloroetheneMO AVG <= .016 mg/L all year
0011,1-DichloroetheneDAILY MX <= .025 mg/L all year
0011,1-DichloroetheneMO AVG <= .045 lb/d all year
0011,1-DichloroetheneDAILY MX <= .07 lb/d all year
001Mercury, total [as Hg]MO AVG report only all year
001Mercury, total [as Hg]DAILY MX report only all year
001Length of longest pH excursionINST MAX <= 60 min all year
0011,3-DichloropropeneMO AVG <= .029 mg/L all year
0011,3-DichloropropeneDAILY MX <= .044 mg/L all year
0011,3-DichloropropeneMO AVG <= .081 lb/d all year
0011,3-DichloropropeneDAILY MX <= .123 lb/d all year
0013,4-BenzofluorantheneMO AVG <= .008 mg/L all year
0013,4-BenzofluorantheneDAILY MX <= .011 mg/L all year
0013,4-BenzofluorantheneMO AVG <= .064 lb/d all year
0013,4-BenzofluorantheneDAILY MX <= .171 lb/d all year
001pH range excursions, monthly total accumMO MAX <= 446 min all year
001ChloroethaneMO AVG <= .104 mg/L all year
001ChloroethaneDAILY MX <= .268 mg/L all year
001ChloroethaneMO AVG <= .291 lb/d all year
001ChloroethaneDAILY MX <= .749 lb/d all year
001LC50 Static 48Hr Acute Ceriodaphnia dubiaDAILY MN report only all year
001%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AVG report only all year
001%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX report only all year
001IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MN report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states