Prepared by GreaseTrapLocator · Fact review: August 9, 2026
What “grease interceptor” can mean
Everyday conversation and product material do not always use the same labels. The 2024 International Plumbing Code is a model code that defines both gravity and hydromechanical forms under the broader term grease interceptor. The code is not automatically the rule for every site: it applies only where a jurisdiction adopts it and can be amended locally.
That is why a product called a “trap” or an “interceptor” should not decide the project by itself. The applicable local requirements, accepted design, and exact product documentation control.
Keep measurements separate
| Item you may see | What it describes | What it does not decide alone |
|---|---|---|
| Liquid gallons | The stated liquid capacity of a named product. | Its flow rating, its installation location, a cleaning schedule, or local approval. |
| Gallons per minute (GPM) | A stated flow rating for a named product or method. | A conversion to liquid capacity, grease-retention capacity, or a local service requirement. |
| Retention time | A design/code element where an applicable provision identifies one. | A universal rule for every device or a maintenance calendar. |
| Local program requirement | A current requirement for the site served by that program. | A rule for another city, state, province, or product model. |
For example, the 2024 IPC's gravity definition includes capacity and retention-time elements where that model-code provision is adopted. That does not turn a single capacity number into a product selection or permit decision for another site.
Documents to assemble before a local review
- Identify the authorities: Determine which wastewater, pretreatment, plumbing, and building authorities apply to the property.
- Confirm the adopted requirements: Ask which current code edition, amendments, permits, and local wastewater conditions govern the project.
- Bring the project facts: Keep approved plans, fixture routing, expected flow and operating conditions, and site constraints together for review.
- Use exact product evidence: Review current listing, rating, installation, and maintenance documents for the named product being considered.
- Confirm ongoing responsibilities: Ask the local program and product manufacturer about the requirements that apply after approval, including service, records, disposal, access, and inspection where relevant.
Why local confirmation matters
EPA explains that local limits can be site-specific and can include numeric or narrative discharge limits and best-management practices. U.S. federal pretreatment rules also prohibit solid or viscous pollutants in amounts that obstruct flow in a publicly owned treatment works and result in interference. Those federal sources explain the framework; they do not create one equipment, service, or recordkeeping rule for every commercial kitchen.
Use this page to prepare a focused conversation with the authority responsible for the site. Do not use it as permission to install, open, enter, service, or chemically treat equipment. Follow the approved project requirements and the current instructions for the actual product instead.
Read the focused guides next
These related pages separate terminology, selection, and mechanism so that a general overview does not become a substitute for a local project review.
Official sources used
International Code Council — 2024 International Plumbing Code, Section 202
The model code defines gravity and hydromechanical grease interceptors under the grease-interceptor term.
Read the Section 202 definitions · reviewed August 9, 2026
U.S. Environmental Protection Agency — Pretreatment Local Limits
EPA explains that local limits can be site-specific and can include numeric or narrative discharge limits and best-management practices.
Read EPA local-limits guidance · reviewed October 15, 2026
Electronic Code of Federal Regulations — 40 CFR 403.5
The regulation prohibits solid or viscous pollutants in amounts that cause obstruction to flow in a publicly owned treatment works resulting in interference. It also allows POTWs to develop best-management-practice local limits.
Read 40 CFR 403.5 · reviewed October 15, 2026
Frequently asked questions
Is a grease interceptor a single national equipment category?
No. Terms can differ in everyday use, product material, and local requirements. The 2024 International Plumbing Code is a model code that defines gravity and hydromechanical forms under the grease-interceptor term, but it applies only where adopted and may be amended locally.
Can a gallon figure, a GPM rating, and a service requirement be used interchangeably?
No. A liquid-capacity figure, a flow rating, and a local service requirement answer different questions. Read each number in the current documentation for the named product and under the locally applicable project requirements.
What should I assemble before a local project review?
Bring the approved plans, fixture routing, expected operating conditions, local code/adoption confirmation, and current documentation for the exact product under consideration. Confirm any permit, access, installation, maintenance, and record requirements with the authority responsible for the site.
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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