Determine which license is required to install, replace, or connect a grease interceptor and pull the necessary permit

Steps

1. Confirm the jurisdiction's licensing requirement for plumbing work generally, since most jurisdictions require a licensed master plumber (or equivalent state/local plumbing contractor license) to perform or supervise grease interceptor installation and connection work
2. As one concrete example, confirm that NYC requires plumbing permits to be filed only by a Licensed Master Plumber (LMP) or Licensed Master Fire Suppression Contractor, and that Philadelphia similarly requires a licensed master plumber to oversee the work
3. Check whether the specific state or locality distinguishes between installing an interior (under-sink) hydromechanical unit versus an exterior buried gravity interceptor, since some jurisdictions allow a broader class of licensed plumber to install exterior units while reserving certain interior connection work for a master-level license
4. Pull the required plumbing permit (and any separate industrial-waste/FOG program approval, which is a distinct approval from the plumbing permit) before beginning installation
5. Schedule the required inspection(s) before the unit is placed into service, since most jurisdictions require inspection and sign-off before a new or replaced interceptor may be used
6. Confirm state-level plumbing contractor licensing requirements in addition to any local permit-filing rules, since some states license the contracting business separately from the individual plumber who pulls the permit