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Westlake Styrene LLC

Chemicals & Allied Products, Sulphur, Louisiana. NPDES permit LA0089362, in force until Mar 31, 2027. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 28 days after each period: form Q quarterly (8 values)
Renewal application due: Oct 2, 2026 · 180 days before expiry; your permit may set another date
Last report on file: September 2026
Oct 2024 – Sep 2025: 0 values over a limit, 0 required values missing, 0 of 4 reports late

Limits in force (8)

Parameter	Statistic	Limit	Months
pH	instantaneous minimum	≥ 6 SU	all year
pH	instantaneous maximum	≤ 9 SU	all year
Oil & Grease	daily maximum	≤ 15 mg/L	all year
Carbon, tot organic [TOC]	daily maximum	≤ 50 mg/L	all year
BTEX	daily maximum	≤ 250 ug/L	all year
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year
Styrene, total	daily maximum	report only (ug/L)	all year

Cited limits by parameter: Louisiana's rules and the federal ones.

Same industry: the 68 Wholesale Trade — Nondurable Goods permits in Louisiana.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/LA0089362 · MCP: https://passage-data.com/mcp