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

Pump before grease + solids reach 25% of depth/capacity. Source: the official program source, checked 2026-10-17. Rules change; confirm with the local sewer authority.

States / Washington / Tacoma

Tacoma, WA grease trap & interceptor requirements

Quoted from official source Last checked 2026-10-17. Report an error / rule changed

Quick answer

How often to pump: Before grease + solids reach 25% of depth/capacity
Interceptor minimum / sizing: not stated in the sources we checked
Permit / fees: not stated in the sources we checked

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	Source says: “Dishwashers and food preparation sinks at these facilities are required to discharge to the interceptor.”
Sizing rule	Source says: “Calculate the total DFUs and choose an interceptor size based on the total DFU count.”
Pumping / cleaning frequency	Pump before grease + solids reach 25% of depth/capacity. Source says “Maintenance Grease interceptors must be cleaned when 25% of their chamber is filled with FOG and solids or when grease is seen discharging through the outlet.”
Permit required?	Not stated in the sources we checked
Permit & program fees	Not stated in the sources we checked
Inspections	Not stated in the sources we checked
Record keeping	Not stated in the sources we checked
Pumper / hauler approval	Not stated in the sources we checked
Reporting portal	Not stated in the sources we checked
Fines & penalties	Not stated in the sources we checked
Program contact	FOG@cityoftacoma.org · (253) 502-2101

Sources

https://cms.tacoma.gov/enviro/Wastewater/FOG/Grease%20Sizing%20Policy.pdf · checked 2026-10-17
https://cms.tacoma.gov/enviro/wastewater/fog/fog%20sizing%20and%20installation%20policy%20clarification%20sheet%201.2025%202.pdf · checked 2026-10-17

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Use the grease interceptor sizing calculator (UPC, IPC and PDI methods), then confirm Tacoma's own minimums above. Not sure how often to pump? Read how often to pump a grease trap.

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