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The Dow Chemical Company

Industrial Organic Chemicals, La Porte, Texas. NPDES permit TX0146391, in force until Aug 19, 2030. Last 12 months: no values over a limit, 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 20 days after each period: form A monthly (11 values)
Last report on file: September 2026
Oct 2024 – Sep 2025: 0 values over a limit, 0 required values missing, 0 of 1 report late

Limits in force (11)

Parameter	Statistic	Limit	Months
pH	minimum	≥ 6 SU	all year
pH	maximum	≤ 9 SU	all year
Benzene	daily average	≤ .37 mg/L	all year
Benzene	daily maximum	≤ .136 mg/L	all year
Chlorobenzene	daily average	≤ .015 mg/L	all year
Chlorobenzene	daily maximum	≤ .028 mg/L	all year
Flow, in conduit or thru treatment plant	daily average	report only (MGD)	all year
Flow, in conduit or thru treatment plant	daily maximum	≤ .08 MGD	all year
Aniline	daily maximum	≤ .16 mg/L	all year
Trichloroethene	daily average	≤ .021 mg/L	all year
Trichloroethene	daily maximum	≤ .054 mg/L	all year

How strict are these limits?

Chlorobenzene, daily maximum .028 mg/L — stricter than 70% of 20 other minor industrial and other permits nationwide; 10% have the same limit
Benzene, daily maximum .136 mg/L — stricter than 11% of 26 other minor industrial and other permits in Texas; 4% have the same limit

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/TX0146391 · MCP: https://passage-data.com/mcp