SI GROUP INC

NPDES permit TX0087254 · Minor NON-POTW · effective, expires 2029-02-28 · 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

16values over a limit
4required values missing, on 1 form(s)
1of 30 forms filed late

Last period with anything received: 2026-07-31. Most often over: Whole Effluent Toxicity [WET] - C. dubia (12), Whole Effluent Toxicity [WET] - P. promelas (4).

Reporting

Reports are due about 20 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (180)

OutfallParameterStatisticLimitMonths
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Oil & GreaseDAILY MX <= 15 mg/L all year
001Carbon, tot organic [TOC]DAILY MX <= 75 mg/L all year
001Carbon tetrachlorideDAILY AV <= .007656 mg/L all year
001Carbon tetrachlorideDAILY MX <= .0162 mg/L all year
0011,2-DichloroethaneDAILY AV <= .0674 mg/L all year
0011,2-DichloroethaneDAILY MX <= .1426 mg/L all year
001AcrylonitrileDAILY AV <= .00519 mg/L all year
001AcrylonitrileDAILY MX <= .011 mg/L all year
001Benzo[a]pyreneDAILY AV <= .000451 mg/L all year
001Benzo[a]pyreneDAILY MX <= .000954 mg/L all year
001ChryseneDAILY AV report only all year
001ChryseneDAILY MX report only all year
001HexachlorobutadieneDAILY AV <= .003281 mg/L all year
001HexachlorobutadieneDAILY MX <= .006942 mg/L all year
001HexachloroethaneDAILY AV <= .0848 mg/L all year
001HexachloroethaneDAILY MX <= .179 mg/L all year
0011,1-DichloroethyleneDAILY AV <= .005332 mg/L all year
0011,1-DichloroethyleneDAILY MX <= .01128 mg/L all year
001Benzo[a]anthraceneDAILY AV <= .000451 mg/L all year
001Benzo[a]anthraceneDAILY MX <= .000954 mg/L all year
001Di[2-ethylhexyl] phthalate [DEHP]DAILY AV report only all year
001Di[2-ethylhexyl] phthalate [DEHP]DAILY MX report only all year
001HexachlorobenzeneDAILY AV <= .0000062 mg/L all year
001HexachlorobenzeneDAILY MX <= .000013 mg/L all year
001Flow, in conduit or thru treatment plantDAILY AV report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001n-Propyl alcoholDAILY AV <= 10 mg/L all year
001n-Propyl alcoholDAILY MX <= 25 mg/L all year
0011,3-DichloropropeneDAILY AV <= .196 mg/L all year
0011,3-DichloropropeneDAILY MX <= .3095 mg/L all year
201BOD, 5-day, 20 deg. CDAILY AV <= 2.4 lb/d all year
201BOD, 5-day, 20 deg. CDAILY MX <= 4.9 lb/d all year
201Solids, total suspendedDAILY AV <= 6.27 lb/d all year
201Solids, total suspendedDAILY MX <= 20.2 lb/d all year
201Carbon tetrachlorideDAILY AV <= .00209 lb/d all year
201Carbon tetrachlorideDAILY MX <= .00558 lb/d all year
2011,2-DichloroethaneDAILY AV <= .00264 lb/d all year
2011,2-DichloroethaneDAILY MX <= .00843 lb/d all year
201ChloroformDAILY AV <= .00163 lb/d all year
201ChloroformDAILY MX <= .00477 lb/d all year
201TolueneDAILY AV <= .000411 lb/d all year
201TolueneDAILY MX <= .00109 lb/d all year
201BenzeneDAILY AV <= .000837 lb/d all year
201BenzeneDAILY MX <= .00197 lb/d all year
201AcenaphthyleneDAILY AV <= .000279 lb/d all year
201AcenaphthyleneDAILY MX <= .00069 lb/d all year
201AcenaphtheneDAILY AV <= .000279 lb/d all year
201AcenaphtheneDAILY MX <= .00069 lb/d all year
201AcrylonitrileDAILY AV <= .00138 lb/d all year
201AcrylonitrileDAILY MX <= .00341 lb/d all year
201AnthraceneDAILY AV <= .000279 lb/d all year
201AnthraceneDAILY MX <= .00069 lb/d all year
201Benzo[k]fluorantheneDAILY AV <= .000279 lb/d all year
201Benzo[k]fluorantheneDAILY MX <= .00069 lb/d all year
201Benzo[a]pyreneDAILY AV <= .000294 lb/d all year
201Benzo[a]pyreneDAILY MX <= .000705 lb/d all year
201ChlorobenzeneDAILY AV <= .00209 lb/d all year
201ChlorobenzeneDAILY MX <= .00558 lb/d all year
201ChryseneDAILY AV <= .000279 lb/d all year
201ChryseneDAILY MX <= .00069 lb/d all year
201Diethyl phthalateDAILY AV <= .000676 lb/d all year
201Diethyl phthalateDAILY MX <= .00166 lb/d all year
201Dimethyl phthalateDAILY AV <= .000279 lb/d all year
201Dimethyl phthalateDAILY MX <= .00069 lb/d all year
201EthylbenzeneDAILY AV <= .00209 lb/d all year
201EthylbenzeneDAILY MX <= .00558 lb/d all year
201FluorantheneDAILY AV <= .000323 lb/d all year
201FluorantheneDAILY MX <= .000793 lb/d all year
201FluoreneDAILY AV <= .000279 lb/d all year
201FluoreneDAILY MX <= .00069 lb/d all year
201HexachlorobutadieneDAILY AV <= .002086 lb/d all year
201HexachlorobutadieneDAILY MX <= .005581 lb/d all year
201HexachloroethaneDAILY AV <= .00288 lb/d all year
201HexachloroethaneDAILY MX <= .0117 lb/d all year
201Methyl chloride [Chloromethane]DAILY AV <= .00162 lb/d all year
201Methyl chloride [Chloromethane]DAILY MX <= .00433 lb/d all year
201Methylene chlorideDAILY AV <= .000529 lb/d all year
201Methylene chlorideDAILY MX <= .0025 lb/d all year
201NitrobenzeneDAILY AV <= .0329 lb/d all year
201NitrobenzeneDAILY MX <= .094 lb/d all year
201PhenanthreneDAILY AV <= .000279 lb/d all year
201PhenanthreneDAILY MX <= .00069 lb/d all year
201PyreneDAILY AV <= .000294 lb/d all year
201PyreneDAILY MX <= .000705 lb/d all year
201TetrachloroethyleneDAILY AV <= .000764 lb/d all year
201TetrachloroethyleneDAILY MX <= .00241 lb/d all year
2011,1-DichloroethaneDAILY AV <= .000323 lb/d all year
2011,1-DichloroethaneDAILY MX <= .000867 lb/d all year
2011,1-DichloroethyleneDAILY AV <= .000323 lb/d all year
2011,1-DichloroethyleneDAILY MX <= .000881 lb/d all year
2011,1,1-TrichloroethaneDAILY AV <= .000323 lb/d all year
2011,1,1-TrichloroethaneDAILY MX <= .000867 lb/d all year
2011,1,2-TrichloroethaneDAILY AV <= .00047 lb/d all year
2011,1,2-TrichloroethaneDAILY MX <= .00187 lb/d all year
201Benzo[a]anthraceneDAILY AV <= .000279 lb/d all year
201Benzo[a]anthraceneDAILY MX <= .00069 lb/d all year
2011,2-DichlorobenzeneDAILY AV <= .00288 lb/d all year
2011,2-DichlorobenzeneDAILY MX <= .0117 lb/d all year
2011,2-DichloropropaneDAILY AV <= .00288 lb/d all year
2011,2-DichloropropaneDAILY MX <= .0117 lb/d all year
201trans-1,2-DichloroethyleneDAILY AV <= .000367 lb/d all year
201trans-1,2-DichloroethyleneDAILY MX <= .000969 lb/d all year
2011,2,4-TrichlorobenzeneDAILY AV <= .00288 lb/d all year
2011,2,4-TrichlorobenzeneDAILY MX <= .0117 lb/d all year
2011,3-DichlorobenzeneDAILY AV <= .00209 lb/d all year
2011,3-DichlorobenzeneDAILY MX <= .00558 lb/d all year
2011,4-DichlorobenzeneDAILY AV <= .00209 lb/d all year
2011,4-DichlorobenzeneDAILY MX <= .00558 lb/d all year
2012-NitrophenolDAILY AV <= .000955 lb/d all year
2012-NitrophenolDAILY MX <= .00339 lb/d all year
2012,4-DimethylphenolDAILY AV <= .000279 lb/d all year
2012,4-DimethylphenolDAILY MX <= .00069 lb/d all year
2012,4-DinitrophenolDAILY AV <= .0177 lb/d all year
2012,4-DinitrophenolDAILY MX <= .063 lb/d all year
2014-NitrophenolDAILY AV <= .002379 lb/d all year
2014-NitrophenolDAILY MX <= .00846 lb/d all year
2014,6-Dinitro-o-cresolDAILY AV <= .00115 lb/d all year
2014,6-Dinitro-o-cresolDAILY MX <= .00407 lb/d all year
201PhenolDAILY AV <= .000279 lb/d all year
201PhenolDAILY MX <= .00069 lb/d all year
201NaphthaleneDAILY AV <= .000279 lb/d all year
201NaphthaleneDAILY MX <= .00069 lb/d all year
201Di[2-ethylhexyl] phthalate [DEHP]DAILY AV <= .00139 lb/d all year
201Di[2-ethylhexyl] phthalate [DEHP]DAILY MX <= .00379 lb/d all year
201Di-n-butyl phthalateDAILY AV <= .000294 lb/d all year
201Di-n-butyl phthalateDAILY MX <= .000632 lb/d all year
201Vinyl chlorideDAILY AV <= .00143 lb/d all year
201Vinyl chlorideDAILY MX <= .00253 lb/d all year
201TrichloroethyleneDAILY AV <= .000382 lb/d all year
201TrichloroethyleneDAILY MX <= .00101 lb/d all year
201HexachlorobenzeneDAILY AV <= .00288 lb/d all year
201HexachlorobenzeneDAILY MX <= .0117 lb/d all year
201Flow, in conduit or thru treatment plantDAILY AV <= .022 MGD all year
201Flow, in conduit or thru treatment plantDAILY MX <= .05 MGD all year
2011,3-DichloropropyleneDAILY AV <= .00288 lb/d all year
2011,3-DichloropropyleneDAILY MX <= .0117 lb/d all year
2013,4-BenzofluorantheneDAILY AV <= .000294 lb/d all year
2013,4-BenzofluorantheneDAILY MX <= .000705 lb/d all year
201ChloroethaneDAILY AV <= .00162 lb/d all year
201ChloroethaneDAILY MX <= .00433 lb/d all year
TX1Whole effluent toxicity - retest #17 DA MIN report only all year
TX1Whole effluent toxicity - retest #1MO AV MN report only all year
TX1Whole effluent toxicity - retest #27 DA MIN report only all year
TX1Whole effluent toxicity - retest #2MO AV MN report only all year
TX1Whole Effluent Toxicity [WET] - C. dubia7 DA MIN >= 100 % all year
TX1Whole Effluent Toxicity [WET] - C. dubiaMO AV MN >= 100 % all year
TX1Whole Effluent Toxicity [WET] - C. dubia7 DA MIN >= 80 % all year
TX1Whole Effluent Toxicity [WET] - C. dubiaMO AV MN >= 80 % all year
TX1Whole Effluent Toxicity [WET] - P. promelas7 DA MIN >= 100 % all year
TX1Whole Effluent Toxicity [WET] - P. promelasMO AV MN >= 100 % all year
TX1Whole Effluent Toxicity [WET] - P. promelas7 DA MIN >= 80 % all year
TX1Whole Effluent Toxicity [WET] - P. promelasMO AV MN >= 80 % all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas7 DA MIN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelasMO AV MN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TXALC50 Pass/Fail Static 24Hr Acute D. PulexSINGSAMP report only all year
TXALC50 Pass/Fail Static 24Hr Acute Pimephales promelasSINGSAMP 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