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Grease Trap Pumping Schedule Calculator

Calculate FOG accumulation rate and optimal pumping frequency using the 25% rule per EPA guidance and PDI standards

Free grease trap pump-out planning screen for restaurant managers, foodservice operators, and plumbing maintenance professionals. Enter trap or interceptor capacity, kitchen type, meals per day, menu intensity, current pump interval, and service cost to estimate daily FOG accumulation, a local 25% threshold screen, and annual pump-out cost. The FOG-per-meal rows, threshold percentage, and 80% margin are planning assumptions only. Final intervals depend on actual grease and solids measurements, local FOG ordinance or permit terms, product instructions, service manifests, and sewer-authority review.

Pro Tip: Measure grease and solids depth before scheduled service for several cycles before changing an interval. The local program may require a fixed maximum interval, a specific threshold, a specific measurement method, approved haulers, disposal records, or corrective action that this planning screen cannot determine.

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Grease Trap Pumping Schedule Calculator
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How It Works

  1. Enter Trap Capacity

    Select a local display row or enter the actual liquid capacity and GPM rating from the installed product or manufacturer data. Verify access, condition, and listed product information separately.

  2. Describe Kitchen Volume

    Select the kitchen type, menu intensity, and meals per day. These rows are local source-gap estimates; use actual measured FOG and solids accumulation whenever records are available.

  3. Compare Current Service

    Enter the current pump interval and service cost to compare estimated accumulation and annual cost against the local screen. This is not an inspection result or compliance record.

  4. Review Source Warnings

    Use the output as a planning note, then confirm the local ordinance, permit, sewer-authority measurement method, service manifests, manufacturer instructions, and qualified plumbing or pretreatment review.

Built For

  • Restaurant managers preparing a preliminary service-interval review before contacting the sewer authority or hauler
  • Foodservice operators comparing current pump-out cost against measured grease and solids logs
  • Plumbing contractors documenting questions for product, access, and maintenance review after installation
  • Pretreatment staff or consultants screening submitted assumptions before checking local records and inspection data
  • Grease haulers discussing service frequency with clients while keeping local program requirements primary

Assumptions

  • FOG-per-meal rows are local source-gap estimates and must be replaced by measured accumulation data when available.
  • The 25% threshold and 80% margin are local planning assumptions; the sewer authority or permit may require a different threshold, maximum interval, record format, or measurement method.
  • Trap capacity and GPM rating are user inputs or local display rows, not product listing, sizing, installation, or maintenance approval.

References

  • EPA, Controlling Fats, Oils, and Grease Discharges from Food Service Establishments
  • PDI G101 source pointer and PDI certified grease interceptor listings
  • ASME A112.14.3/CSA B481.1 source pointer for hydromechanical grease interceptor context
  • Local sewer authority, FOG ordinance, permit, inspection, manifest, and manufacturer records

Frequently Asked Questions

Many FOG programs use a grease-plus-solids accumulation threshold, often around 25% of liquid depth, but the exact threshold and measurement method are local-program questions. Use the local ordinance, permit, inspector method, and measured depth logs rather than treating any universal percentage as compliance.
Use the local ordinance or permit, manufacturer instructions, hauler records, and measured grease and solids accumulation from the actual unit. This screen estimates a local interval from meal volume and trap capacity, but measured accumulation over several service cycles is the reliable basis.
No. Enforcement, surcharges, corrective actions, and inspection status depend on the local sewer authority, permit terms, records, measured accumulation, and site conditions. The output is a planning note only.
Only if the local program and product instructions allow them, and never as a substitute for required pumping records unless the authority explicitly approves. Additives can change how grease behaves downstream, so verify with the sewer authority before use.
Disclaimer: This planning screen provides estimated pump-out intervals from local FOG accumulation assumptions. It is not a permit record, inspection result, sewer-authority approval, FOG ordinance compliance check, pretreatment determination, product-listing review, or maintenance contract. Verify all intervals with the local sewer authority, actual depth logs, manufacturer instructions, and qualified review.

Learn More

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Grease Trap Pumping Records and Schedule Planning

How grease trap and interceptor pump-out planning depends on measured grease and solids, local thresholds, product instructions, manifests, and sewer-authority review.

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