Two devices, two clocks
Under-sink grease traps
Hydromechanical units “shall be cleaned at least every thirty (30) days or whenever twenty-five percent (25%) of the trap volume is occupied by grease and solids, whichever occurs first.” Monthly route, flat price.
Trap cleaning →In-ground interceptors
“Pumped by a wastewater hauler at least every ninety (90) days or whenever twenty-five percent (25%) of the last chamber volume is occupied by grease and solids, whichever occurs first” — and immediately if grease shows in the sample box.
Interceptor pumping →Backed up during service?
Slow sink, gurgling floor drain, smell in the dish pit. Call and say “emergency.”
Emergency service →Why the whichever-comes-first matters
The code gives you a calendar and a fill line, and the stricter one wins. A 1,000-gallon interceptor behind a busy fryer line can reach 25% of its last chamber in six weeks; the 90 days was never going to be your interval. The calculator estimates where your kitchen lands, and the reading we take at the first pump-out replaces the estimate.
What “cleaned” means here
The county does not accept a skim. The device must be “pumped dry,” the “sides, baffles and tees” washed down, and the wash water “not returned to the device or sewer” (8.03.5080.B.5). That is the job on every visit, and it is what makes the 90 days hold.
What every visit leaves behind
- A dated service record with volume removed and the hauler — the three items 8.03.5080.C says your on-site file must contain for three years
- The percent-full reading before service — your 25%-rule evidence
- A note on baffles, tees, lids and the sample box
Flat price, by device size
Trap or interceptor, gallons, meals per day. Scheduled around your deliveries.
Call (509) 352-0550Guides
The county FOG rule, translated
8.03.5020 through 8.03.5080, section by section.
City of Spokane vs the county
Who sets your rules depends on whose sewer you are on.
Enzymes are not permitted
8.03.5080.B.6, and the reason.
Sink backing up
What to do in the next hour.