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Twin Brothers Marine LLC

Fabricated Structural Metal, Franklin, Louisiana. NPDES permit LA0124257, in force until Dec 31, 2029. Last 12 months: over a limit once (last March 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due

About 28 days after each period: outfall 001 form Q quarterly (10 values), outfall 002 form Q quarterly (10 values), outfall 003 form Q quarterly (10 values), outfall 004 form Q quarterly (10 values), outfall 005 form Q quarterly (10 values), outfall 006 form Q quarterly (8 values), and 7 more forms

Last report on file

June 2026

Oct 2024 – Sep 2025

0 values over a limit, 87 required values missing, 10 of 45 reports late

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

Limits in force (85)

How strict are these limits?

• Oxygen demand, chem. [high level] [COD], daily maximum 250 mg/L — stricter than 43% of 153 other minor industrial and other permits in Louisiana; 15% have the same limit
• Solids, total suspended, daily maximum 45 mg/L — stricter than 18% of 551 other minor industrial and other permits in Louisiana; 59% have the same limit
• Benzene, daily maximum 50 ug/L — stricter than 16% of 127 other minor industrial and other permits in Louisiana; 80% have the same limit

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

Same industry: the 7 Fabricated Metal Products permits in Louisiana.

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/LA0124257 · MCP: https://passage-data.com/mcp