Washington FOG & Grease Trap Rules

Seattle and King County

• Food-permit commercial kitchens must install and maintain a grease interceptor. Clean it according to the manufacturer’s instructions; when no instructions exist, keep buildup at or below 25 percent.
• Seattle Municipal Code prohibits FOG concentrations over 100 parts per million and prohibits additives. Maintenance logs and service-provider information must be documented.
• Seattle penalties range from $250 to $5,000. King County plumbing requirements govern approved installation standards.

Sources

• WA1 — Seattle FOG commercial kitchens
• WA2 — King County plumbing requirements

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