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Syensqo USA LLC

Chemical Preparations, major discharger, Vernon, Texas. NPDES permit TX0088781, in force until Jan 8, 2031. Last 12 months: over a limit 4 times (last February 2026), 8 required values missing, 6 of 26 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (19 values), outfall 002 form A monthly (6 values), outfall TX1 form Q quarterly, outfall TXA form S twice a year
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 30 reports late

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

Period endingParameterReportedLimitOver by
December 2025BOD, carbonaceous [5 day, 20 C], daily maximum168 mg/L≤ 84 mg/L100%
January 2026BOD, carbonaceous [5 day, 20 C], daily average88.01 mg/L≤ 42 mg/L110%
January 2026BOD, carbonaceous [5 day, 20 C], daily maximum187 mg/L≤ 84 mg/L123%
February 2026Oxygen, dissolved [DO], monthly minimum4.9 mg/L≥ 5 mg/L2%

Limits in force (46)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimum≥ 5 mg/Lall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendeddaily averagereport only (mg/L)all year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Solids, total suspendeddaily average≤ 325 lb/dall year001
Solids, total suspendeddaily maximum≤ 650 lb/dall year001
Nitrogen, ammonia total [as N]daily average≤ 3 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximum≤ 5 mg/Lall year001
Carbon, tot organic [TOC]daily averagereport only (mg/L)all year001
Carbon, tot organic [TOC]daily maximumreport only (mg/L)all year001
Carbon, tot organic [TOC]daily average≤ 9433 lb/dall year001
Carbon, tot organic [TOC]daily maximum≤ 16480 lb/dall year001
Flow, in conduit or thru treatment plantdaily average≤ 1.3 MGDall year001
Flow, in conduit or thru treatment plantdaily maximum≤ 2 MGDall year001
BOD, carbonaceous [5 day, 20 C]daily average≤ 39 mg/LMar001
BOD, carbonaceous [5 day, 20 C]daily average≤ 42 mg/LJan, Feb, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]daily average≤ 23 mg/LApr–Oct001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 78 mg/LMar001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 84 mg/LJan, Feb, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 46 mg/LApr–Oct001
BOD, carbonaceous [5 day, 20 C]daily average≤ 423 lb/dMar001
BOD, carbonaceous [5 day, 20 C]daily average≤ 455 lb/dJan, Feb, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]daily average≤ 249 lb/dApr–Oct001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 846 lb/dMar001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 910 lb/dJan, Feb, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 498 lb/dApr–Oct001
Oxygen demand, chem. [high level] [COD]daily maximum≤ 500 mg/Lall year002
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Oil & Greasedaily maximum≤ 15 mg/Lall year002
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Whole Effluent Toxicity [WET] - P. promelas7-day minimum≥ 80 %all yearTX1
Whole Effluent Toxicity [WET] - P. promelasmonthly average minimum≥ 80 %all yearTX1
Whole Effluent Toxicity [WET] - P. promelas7-day minimum≥ 92 %all yearTX1
Whole Effluent Toxicity [WET] - P. promelasmonthly average minimum≥ 92 %all yearTX1
IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all yearTX1
IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all yearTX1
IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all yearTX1
IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all yearTX1
IC25 Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
IC25 Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all yearTX1
IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all yearTX1
LC50 Pass/Fail Static 24Hr Acute Pimephales promelassingle samplereport only (pass=0;fail=1)all yearTXA

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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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TX0088781 · MCP: https://passage-data.com/mcp