How often do grease traps have to be pumped in Spokane, WA?

Pump hydromechanical interceptors at least every 30 days or at 25% full, whichever comes first. Source: City of Spokane Wastewater Management (Industrial Pretreatment), checked 2026-10-17. Rules change; confirm with the local sewer authority.

Do restaurants in Spokane need a grease trap permit?

Permit required, per the official source checked 2026-10-17.

States / Washington / Spokane

Spokane, WA grease trap & interceptor requirements

Program run by City of Spokane Wastewater Management (Industrial Pretreatment). Quoted from official source Last checked 2026-10-17. Report an error / rule changed

Quick answer

How often to pump: Hydromechanical interceptors at least every 30 days or at 25% full, whichever comes first
Interceptor minimum / sizing: not stated in the sources we checked
Permit / fees: Permit required

From the official source(s) below, last checked 2026-10-17. Rules change; verify with your city.

Rules change; verify with your city. Summaries are plain-English restatements of the official source linked below; “Source says” shows the exact wording. Blank rows mean the sources we checked did not state that rule, not that there is no rule.

Required trap / interceptor type	Not stated in the sources we checked
Sizing rule	Not stated in the sources we checked
Pumping / cleaning frequency	Pump hydromechanical interceptors at least every 30 days or at 25% full, whichever comes first. Source says “Hydromechanical grease interceptors shall be cleaned at least once every thirty days, or when the device is filled to twenty-five percent or more of capacity with grease or settled solids, whichever comes first.”
Permit required?	A permit is required (see source wording). Source says “The use of chemical or biological additives, enzymes or surfactants acting as grease emulsifiers is not permitted as a method for cleaning the grease control device.”
Permit & program fees	Not stated in the sources we checked
Inspections	Grease traps/interceptors are subject to inspection. Source says “The Wastewater Director may conduct an inspection of grease control devices, sand traps, and oil/water separators.”
Record keeping	Keep pumping and maintenance records (manifests/logs) available for inspection. Source says “English: Grease Control Device Recordkeeping (199 KB).”
Pumper / hauler approval	Use an approved / licensed grease hauler. Source says “Users shall maintain records showing the following related to all wastes hauled off site: date and time material removed off site; volume removed; licensed wastewater hauler or hazardous waste disposal company name.”
Reporting portal	Not stated in the sources we checked
Fines & penalties	Not stated in the sources we checked
Program contact	509.755.2489

Sources

https://my.spokanecity.org/publicworks/wastewater/business/ · checked 2026-10-17
https://my.spokanecity.org/smc/?Section=13.03.0508 · checked 2026-10-17

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