FOG rules for restaurants are set mostly at the local level, and they change over time as cities update their sewer-use rules. If you run a commercial kitchen, here are examples of local requirements and practical steps for checking what applies to you.
Know Your Cleaning Schedule
Some cities set a cleaning threshold. Seattle, for example, says no more than 25% of an interceptor should contain food or FOG buildup when manufacturer specs are not available. Check the rule in your permit or local bylaw.
If your permit sets a cleaning schedule, keep to it and keep the records. Regular service also helps you catch problems before they turn into emergency pump-outs or line blockages.
When you compare service companies, ask what records they give you after each visit and whether those records cover what your local permit asks for.
Why Cities Focus on Grease
In EPA's 2004 Report to Congress, grease was the most common reported cause of sewer blockages, at 47% of the blockage events in EPA's data. Some cities have been required to run FOG programs under federal Clean Water Act consent decrees. Memphis is one example.
Penalties are set locally. Seattle, for example, says kitchens that are out of compliance may be fined, with fees from $250 to $5,000. Check your own city's sewer-use rules. Some cities can also charge a business for damage its grease causes to the sewer system. Seattle, for example, says the business owner may be required to pay the City's costs for that damage, in addition to fines.
Get every service visit in writing. Record-keeping rules vary. Bremerton, WA, for example, requires written maintenance records kept for at least three years, showing the service date, gallons pumped, hauler name and disposal location. Check what your local permit requires.
Enzyme and Biological Additives Are Restricted in Some Cities
Some products are sold as a way to break down grease instead of pumping. Some cities ban them. Seattle says businesses cannot use emulsifying agents, enzymes, bio-additives or similar chemicals in their grease interceptors, and Bremerton, WA, also prohibits enzymes, emulsifying chemicals and bacterial or microbial agents.
Grease traps work by letting grease separate from the water. Bremerton's code explains that enzymes or chemical emulsifiers would interfere with that separation and defeat the purpose of the trap.
In the United States, federal pretreatment rules prohibit discharges that cause pass through or interference, including solid or viscous pollutants in amounts that obstruct flow and result in interference. The safe approach is regular pumping on the schedule your permit sets. Before buying any additive, check whether your city allows it.
Frequently Asked Questions
How do I find out what FOG rules are coming in my area?
Rules are set mostly at the local level. Check your local sewer authority's website for proposed changes to its sewer-use or FOG rules, or contact it directly. In Canada, check the provincial or territorial and municipal rules that apply.
Who is responsible for the grease trap in a leased space?
It depends on your lease and your local rules. Property owners and restaurant tenants should agree in the lease who maintains the trap, pays for service and pays any penalties. Check your city's rules on who is responsible, and ask a local lawyer if it is unclear.
Are enzyme products completely banned or just restricted?
It depends on the city. Some ban them outright: Seattle says businesses cannot use emulsifying agents, enzymes, bio-additives or similar chemicals in their grease interceptors. Check with your local sewer authority before using any additive, and keep pumping on your required schedule either way.
What happens to restaurants that can't afford compliance upgrades?
Talk to your local sewer authority early. Ask what your permit requires, what deadlines apply and whether any options exist for your situation.
FOG rules are set mostly at the local level and can change. Keep your trap serviced on schedule, keep written records of every visit, and check your local rules before using any additive. Compare local grease trap service companies at https://www.greasetraplocator.com.
Author: Grease Trap Locator Editorial Team
The Grease Trap Locator editorial team covers FOG compliance, grease trap maintenance, and commercial kitchen regulations across the US and Canada. Our guides are written for restaurant owners, facility managers, and food service operators who need practical, accurate information without the fluff.
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