SYENSQO USA LLC

NPDES permit TX0088781 · Major NON-POTW · effective, expires 2031-01-08 · 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

4values over a limit
8required values missing, on 1 form(s)
6of 27 forms filed late

Last period with anything received: 2026-07-31. Most often over: BOD, carbonaceous [5 day, 20 C] (3), Oxygen, dissolved [DO] (1).

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 (46)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]MO MIN >= 5 mg/L all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedDAILY AV report only all year
001Solids, total suspendedDAILY MX report only all year
001Solids, total suspendedDAILY AV <= 325 lb/d all year
001Solids, total suspendedDAILY MX <= 650 lb/d all year
001Nitrogen, ammonia total [as N]DAILY AV <= 3 mg/L all year
001Nitrogen, ammonia total [as N]DAILY MX <= 5 mg/L all year
001Carbon, tot organic [TOC]DAILY AV report only all year
001Carbon, tot organic [TOC]DAILY MX report only all year
001Carbon, tot organic [TOC]DAILY AV <= 9433 lb/d all year
001Carbon, tot organic [TOC]DAILY MX <= 16480 lb/d all year
001Flow, in conduit or thru treatment plantDAILY AV <= 1.3 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX <= 2 MGD all year
001BOD, carbonaceous [5 day, 20 C]DAILY AV <= 39 mg/L Mar
001BOD, carbonaceous [5 day, 20 C]DAILY AV <= 42 mg/L Jan, Feb, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]DAILY AV <= 23 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 78 mg/L Mar
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 84 mg/L Jan, Feb, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 46 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]DAILY AV <= 423 lb/d Mar
001BOD, carbonaceous [5 day, 20 C]DAILY AV <= 455 lb/d Jan, Feb, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]DAILY AV <= 249 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 846 lb/d Mar
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 910 lb/d Jan, Feb, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 498 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
002Oxygen demand, chem. [high level] [COD]DAILY MX <= 500 mg/L all year
002pHMINIMUM >= 6 SU all year
002pHMAXIMUM <= 9 SU all year
002Oil & GreaseDAILY MX <= 15 mg/L all year
002Flow, in conduit or thru treatment plantDAILY AV report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
TX1Whole Effluent Toxicity [WET] - P. promelas7 DA MIN >= 80 % all year
TX1Whole Effluent Toxicity [WET] - P. promelasMO AV MN >= 80 % all year
TX1Whole Effluent Toxicity [WET] - P. promelas7 DA MIN >= 92 % all year
TX1Whole Effluent Toxicity [WET] - P. promelasMO AV MN >= 92 % all year
TX1IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX1IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX1IC25 Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1IC25 Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX1IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AV MN 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