Grease and Oil Interceptors

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Approvals or Permits Issued Submittal Requirements Additional Information Expected Processing Time

Important Notice:

The processes below may have changed due to COVID-19. Please visit our Planning and Development information page for the most up to date processes and procedures.

Improper discharge of fats, oils and grease into the sanitary sewer system is a leading cause of sanitary sewer overflows. The pretreatment coordinator reviews and approves pretreatment systems and sizing calculations to ensure that they are adequate for the fats, oils and grease to be discharged by food service establishments and vehicle maintenance facilities.

An applicant must obtain approval for a pretreatment system prior to submitting commercial building plans for new buildings, additions, change of use, alterations and interior completions at a food service establishment or vehicle maintenance facility.

  • A food service establishment includes any commercial building that has a kitchen or food preparation area where grease-laden waste is drained into the sanitary sewer system.
  • A vehicle maintenance facility is a place where automobiles are serviced, greased, repaired or washed. This includes automobile repair shops, engine repair shops, car washes and rental equipment washes.

Approvals or Permits Issued

The pretreatment coordinator issues a letter or email approving the pretreatment system.

Submittal Requirements

Type Description
Required for all Projects

Prepare submittal package for commercial projects according to Express Review or Commercial Standard Review processes.  A copy of the approval letter or email must be affixed to each set of plumbing plans submitted for commercial building plan review. Please email the pretreatment coordinator Stephen Calverley, or call 919-996-2334 to obtain an approval letter.

Additional Information

Expected Processing Time

Grease and oil inceptors are processed during either the Express Review or Commercial Standard Review. Please click here to download our standard review times.


Lead Department:
Permits and Inspections
Service Categories:
Express Services Non-Residential Permits



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