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Does a grease interceptor need its own vent and trap primer?
A grease-interceptor inspection question seems hard to answer without knowing what the local code actually requires. Which jurisdiction and adopted plumbing-code edition should an operator check first?
I’m especially unsure how the answer changes with the interceptor’s type and location, such as an indoor unit versus an outdoor one. If an inspector flags an issue, what’s the best way to tell whether it’s specifically about venting, trap-seal protection, or a locally approved alternative? Would the cited code section and approved plans or product documentation normally clarify whether a separate vent or trap primer is required?
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Start with the authority having jurisdiction for the property - usually the city or county building or plumbing department. Ask which plumbing-code edition and local amendments applied to the permit or inspection; don’t assume the newest published edition is the one in force. Then compare the inspector’s cited section with the approved plans and interceptor documentation, since the applicable requirements can depend on the unit and its location.
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