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The Port of Olympia

Wood Preserving, Olympia, Washington. NPDES permit WA0040533 expired Apr 30, 2026; its terms still apply. Last 12 months: over a limit 2 times (last December 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due: About 15 days after each period: form MM monthly (7 values)
Last report on file: April 2026
Oct 2024 – Sep 2025: 1 value over a limit, 0 required values missing, 0 of 12 reports late

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

Period ending	Parameter	Reported	Limit	Over by
November 2025	Pentachlorophenol, average	1.03	≤ 1 ug/L	3%
December 2025	Pentachlorophenol, average	1.12	≤ 1 ug/L	12%

Limits in force (7)

Parameter	Statistic	Limit	Months
pH	daily minimum	≥ 6 SU	all year
pH	daily maximum	≤ 9 SU	all year
Solids, total suspended	daily maximum	≤ 15 mg/L	all year
Benzo[a]pyrene	daily maximum	report only (ug/L) (alert, not enforceable)	all year
Pentachlorophenol	average	≤ 1 ug/L	all year
Flow	daily maximum	report only (gal/mo) (alert, not enforceable)	all year
Flow	monthly average	report only (gal/mo) (alert, not enforceable)	all year

How strict are these limits?

Solids, total suspended, daily maximum 15 mg/L — stricter than 88% of 25 other minor industrial and other permits in Washington

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

Same industry: the 11 Lumber and Wood Products permits in Washington.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WA0040533 · MCP: https://passage-data.com/mcp