Reviewed August 16, 2026. Commercial kitchen plumbing must be planned for the actual menu, equipment, building, utilities, and locally adopted requirements. The FDA Food Code and International Plumbing Code are useful model documents, but neither automatically supplies the law for every restaurant.
Build the local requirements list first
Before design or renovation, identify the building and plumbing authority, food-safety authority, fire authority, sewer utility or pretreatment program, and any accessibility review that applies. Ask which code editions and local amendments are in force, what plans and permits are needed, and which inspections or approvals occur before operation.
Use qualified local designers and trades for the work within their allowed scope. A website guide cannot approve fixture counts, pipe sizes, materials, interceptor size, gas work, or an accessibility solution.
Coordinate fixtures, equipment, and utilities
Create an equipment schedule with manufacturer installation instructions before the plumbing layout is finalized. Record water supply, pressure, temperature, treatment, drainage, indirect-waste, backflow, electrical, gas, ventilation, access, and service-clearance needs for each item.
The FDA Food Code addresses food-establishment water, plumbing, backflow protection, handwashing facilities, drainage, and sewage as a model for adoption. The International Plumbing Code addresses topics such as indirect waste and grease interceptors in its model provisions. The adopted local rules and approved plans control the project.
Plan grease control as part of the drainage system
Ask the sewer or pretreatment authority which fixtures discharge through grease-control equipment, which sizing method it accepts, where the unit may be installed, and what access, flow control, sampling, maintenance, and records it requires.
Do not assume that seating count, drainage fixture units, flow rate, or a manufacturer chart is the only accepted sizing method. Submit the calculation and selected equipment through the local approval route.
Protect water and food areas
Backflow and cross-connection protection depends on the hazard and connection. Indirect-waste and air-gap requirements also depend on the adopted code and equipment. Have the designer identify each protection method on the plans and have the authority approve it.
Provide the number and location of handwashing facilities required by the adopted food code and operating layout. The FDA model calls for conveniently located facilities, but it does not create a nationwide “one sink per prep area” rule.
Address accessibility and employee work areas correctly
Accessibility obligations depend on the space, work area, construction or alteration scope, and applicable standards and exceptions. Employee work areas have distinct provisions. Obtain qualified local design review rather than assuming every kitchen fixture follows the same rule as a public restroom fixture.
Create the maintenance handoff
At completion, keep approved plans, equipment manuals, permits, test and inspection records, shutoff and cleanout locations, warranty information, and authority contacts. Build a maintenance plan from local requirements, manufacturer instructions, observed conditions, and service history—not a generic national calendar.
Staff controls should follow the local FOG program: keep used cooking oil and pan grease out of drains, scrape or dry-wipe where directed, and use allowed solids controls. Do not use hot water or a chemical as a substitute for proper grease management.
For recurring line symptoms, see the restaurant sewer-line guide. If water-jet cleaning is proposed, use the hydro-jetting checklist.
Frequently asked questions
Which plumbing code applies to my restaurant?
Ask the local building or plumbing authority for the adopted edition and amendments. Model codes and web summaries do not establish the controlling local rule.
How is a grease interceptor sized?
Use the calculation and approval route required by the local sewer and plumbing authorities, together with the selected equipment documentation.
Can residential fixtures be used in a commercial kitchen?
Do not decide from a residential-versus-commercial label alone. The fixture must meet the adopted code, food-safety requirements, listing or approval conditions, and operating needs.
Do restaurant renovations require permits?
Permit scope varies by work and location. Confirm it with the local authority before demolition, installation, or connection work begins.
Official sources
- U.S. FDA: 2022 Food Code and model-code status
- U.S. FDA: 2022 Food Code print edition
- International Code Council: 2024 IPC Chapter 8
- International Code Council: 2024 IPC Chapter 10
- U.S. Department of Justice: ADA Standards Guidance
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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