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Weyerhaeuser NR Co - Zwolle Plywood & Sawmill

Softwood Veneer And Plywood, Zwolle, Louisiana. NPDES permit LA0080764, in force until Aug 31, 2030. 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 (6 values), form S twice a year
Last report on file: June 2026
Oct 2024 – Sep 2025: 0 values over a limit, 0 required values missing, 0 of 6 reports late

Limits in force (7)

Parameter	Statistic	Limit	Months
Oxygen demand, chem. [high level] [COD]	daily maximum	≤ 250 mg/L	all year
Oxygen demand, chem. [high level] [COD]	daily maximum	≤ 250 mg/L	all year
pH	instantaneous minimum	≥ 6 SU	all year
pH	instantaneous maximum	≤ 9 SU	all year
Oil & Grease	daily maximum	≤ 15 mg/L	all year
Flow, in conduit or thru treatment plant	monthly average	report only (gal/d)	all year
Flow, in conduit or thru treatment plant	daily maximum	report only (gal/d)	all year

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

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

Same industry: the 18 Lumber and Wood Products 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/LA0080764 · MCP: https://passage-data.com/mcp