A restaurant or commercial kitchen in Beaverton is required to have a properly sized grease trap or interceptor, keep it maintained on a schedule matched to its grease load, and document that maintenance, because food-service properties fall under Clean Water Services' fats-oils-and-grease program for Washington County. The trap keeps kitchen grease out of the sewer, and staying compliant means cleaning it before it fills, keeping records the wastewater authority can ask for, and clearing the drain lines it protects. Skipping it risks both a backup that shuts your kitchen and a problem with the regulator.
Why the grease trap exists
Every commercial kitchen produces fats, oils, and grease, and a grease trap, or a larger interceptor, is what keeps that grease out of the public sewer. It works by slowing the wastewater so grease floats to the top and solids settle to the bottom, letting only the clearer water in the middle flow on to the sewer. Without it, grease pours straight into the drain lines and the sewer lateral, where it congeals and clogs, and the result is the backup that shuts a kitchen down in the middle of service.
That failure mode is exactly what the rules are designed to prevent, and it is not just your problem when it happens. Grease that gets past an unmaintained trap contributes to blockages in the public system too, which is why the wastewater authority regulates it rather than leaving it to each business. The trap is cheap insurance against a mid-service backup, and letting it fill is how a routine maintenance item becomes an emergency at the worst possible time.
What Clean Water Services requires
In Washington County, Clean Water Services runs the fats-oils-and-grease program that food-service businesses fall under. The core requirements are straightforward in principle: have a properly sized grease trap or interceptor for your kitchen's volume, clean or pump it on a schedule appropriate to how fast it fills, and keep documentation of that maintenance, because the authority can ask to see it. A trap that is undersized, overfull, or undocumented is out of compliance even if the kitchen is running.
The right cleaning interval is not an arbitrary date; it is matched to your kitchen's real grease load. A high-volume kitchen fills a trap far faster than a small cafe, and a common standard is to service before the trap is about a quarter full of grease and solids. Professional grease trap cleaning in Beaverton on a schedule fit to your operation, with the service documented, is what keeps the compliance side handled alongside the plumbing.
The essentials of grease-trap compliance for a Beaverton food-service property.
| Requirement | What it means | How to meet it |
|---|---|---|
| Proper sizing | Trap fits kitchen volume | Right unit for the load |
| Scheduled cleaning | Service before it fills | Interval matched to grease load |
| Documentation | Records the authority can ask for | Keep every service documented |
| Clear downstream lines | Grease not built up in the pipe | Jet the lines when needed |
Indoor traps versus outdoor interceptors
Which unit you have shapes the maintenance. A smaller strip-mall kitchen often runs a compact under-sink grease trap that needs frequent service, since it holds relatively little. A larger restaurant may have an in-ground exterior grease interceptor holding hundreds of gallons, which is pumped less often but is a bigger job when it is. The right interval and method depend on which one sits between your kitchen and the sewer, and a plumber who services both can set the schedule accordingly.
A real cleaning is also more than skimming the top. It removes the accumulated grease and the settled solids, cleans the trap, and checks that the baffles and the inlet and outlet are clear so the trap works as designed until the next service. Skimming the surface and calling it done leaves the trap effectively full and the compliance clock still running, which is why proper service matters beyond just checking a box.
Keeping the lines behind the trap clear
Compliance is not only about the trap; it is about the whole grease picture. A kitchen that has been running a full or undersized trap often has grease already built up in the drain lines downstream, so even a freshly cleaned trap can sit above lines that are still coating up and slowing. Where that is the case, clearing those lines, frequently with hydro jetting that scours the pipe wall, is what actually restores full flow, rather than cleaning the trap and leaving the clog behind it in place.
The practical path to staying both compliant and clog-free is a maintenance relationship rather than a scramble when the drains slow. Grease-trap service is one piece of the broader commercial plumbing compliance most food-service properties need, alongside backflow testing and the rest, and handling it together is how Beaverton restaurants, from Cedar Hills Crossing to the spots around The Round, keep the kitchen open and the regulator satisfied. A trap serviced on time is far cheaper than a backup during dinner.