How often does my grease interceptor or grease trap need to be maintained?

There is a 25% rule that applies to both grease interceptors and grease traps that states the FOG (floats to the top) and solids (settles to the bottom) content of the device should not be in excess of 25% of the grease interceptor/trap depth. Typically, cleaning frequencies for grease traps may be in the range of daily to weekly. Cleaning frequencies for grease interceptors can be expected to be monthly or quarterly.

This 25% rule allows the wastewater enough residence time inside the device to effectively remove the FOG and solids from the wastewater before it reaches the sanitary sewer system.

The single most important thing you can do to help extend the length of time between maintenance and saving your facility in maintenance expense is to use diligence in dry cleanup prior to wet cleanup. Scrape food debris in the garbage and dry-wipe the dishes prior to immersion in hot water (sink or dishwasher).

Show All Answers

1. What is FOG and why should I care?
2. What types of facilities are required to meet the directives of the new ordinance?
3. Will my existing grease trap (indoor, under the sink unit) be sufficient to comply with the new ordinance?
4. How often does my grease interceptor or grease trap need to be maintained?
5. May I use chemicals, enzymes or bacteria in my grease removal device or in my drains?
6. What are the most important things for me, the business owner or operator, to know about the FOG program?
7. What are the enforcement action(s) that could potentially occur if the regulations of the FOG Program are not met by my business?