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Nouryon Chemicals LLC+

Industrial Organic Chemicals, La Porte, Texas. NPDES permit TX0006688, in force until Mar 17, 2031. Last 12 months: over a limit 2 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (16 values), outfall 101 form A monthly (11 values), outfall TXA form S twice a year
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 26 reports late

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

Period endingParameterReportedLimitOver by
December 2025Enterococci, daily maximum2419.6 CFU/100mL≤ 200 CFU/100mL1110%
September 2026Enterococci, daily maximum2419.6 CFU/100mL≤ 130 CFU/100mL1761%

Limits in force (31)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitdaily maximum≤ 95 deg Fall year001
Oxygen, dissolved [DO]monthly minimum≥ 4 mg/Lall year001
Oxygen demand, chem. [high level] [COD]daily maximum≤ 150 mg/Lall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Nitrogen, ammonia total [as N]daily average≤ 3 mg/LApr–Oct001
Nitrogen, ammonia total [as N]daily average≤ 5 mg/LJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 6 mg/LApr–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/LJan, Feb, Mar, Nov, Dec001
Zinc, total [as Zn]daily average≤ .302 mg/Lall year001
Zinc, total [as Zn]daily maximum≤ .639 mg/Lall year001
Aluminum, total [as Al]daily average≤ 3.28 mg/Lall year001
Aluminum, total [as Al]daily maximum≤ 6.94 mg/Lall year001
Flow [dry weather]daily average≤ .06 MGDall year001
Flow [dry weather]daily maximumreport only (MGD)all year001
Enterococcidaily maximumreport only (CFU/100mL)all year001
BOD, carbonaceous [5 day, 20 C]daily average≤ 10 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/Lall year001
Oxygen, dissolved [DO]monthly minimum≥ 4 mg/Lall year101
BOD, 5-day, 20 deg. Cdaily maximum≤ 65 mg/Lall year101
pHminimum≥ 6 SUall year101
pHmaximum≤ 9 SUall year101
Solids, total suspendeddaily maximum≤ 65 mg/Lall year101
Flow, in conduit or thru treatment plantdaily average≤ .005 MGDall year101
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year101
Chlorine, total residualmonthly minimum≥ 1 mg/Lall year101
Chlorine, total residualmonthly maximum≤ 4 mg/Lall year101
Enterococcidaily average≤ 35 CFU/100mLall year101
Enterococcidaily maximum≤ 130 CFU/100mLall year101
LC50 Pass/Fail Static 24Hr Acute Americamysis bahia (formerly Mysidopsis bahia)single samplereport only (pass=0;fail=1)all yearTXA
LC50 Pass/Fail Static 24Hr Acute Menidia menidiasingle 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/TX0006688 · MCP: https://passage-data.com/mcp