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Chemtrade Sulex Inc

Industrial Inorganic Chemicals, Mount Vernon, Washington. NPDES permit WA0031283 expired Jan 31, 2026; its terms still apply. Last 12 months: over a limit once (last December 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due: About 15 days after each period: form MM monthly (8 values)
Last report on file: January 2026
Oct 2024 – Sep 2025: 1 value over a limit, 1 required value missing, 0 of 12 reports late

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

Period ending	Parameter	Reported	Limit	Over by
December 2025	Solids, total suspended, average	54	≤ 30 mg/L	80%

Limits in force (8)

Parameter	Statistic	Limit	Months
Temperature, water deg. centigrade	maximum	report only (deg C) (alert, not enforceable)	Jun–Sep
Oxygen, dissolved [DO]	daily minimum	≥ 8 mg/L	Jun–Sep
pH	daily minimum	≥ 6.5 SU	all year
pH	daily maximum	≤ 8.5 SU	all year
Solids, total suspended	average	≤ 30 mg/L	all year
Sulfide, total [as S]	daily maximum	≤ .2 mg/L	all year
Sulfate, total [as SO4]	maximum	report only (mg/L) (alert, not enforceable)	all year
Flow	maximum	report only (gal/d) (alert, not enforceable)	all year

How strict are these limits?

Oxygen, dissolved [DO], daily minimum at least 8 mg/L — stricter than 99% of 2,912 other minor industrial and other permits nationwide
pH, daily minimum at least 6.5 SU — stricter than 74% of 78 other minor industrial and other permits in Washington; 23% have the same limit
pH, daily maximum 8.5 SU — stricter than 74% of 78 other minor industrial and other permits in Washington; 26% have the same limit

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

Same industry: the 7 Chemicals and Allied 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/WA0031283 · MCP: https://passage-data.com/mcp