Prepared by GreaseTrapLocator · Fact review: August 17, 2026
Identify whether the device is a trap or interceptor
Metro Water Services' FOG policy distinguishes a grease trap, generally a smaller device, from a grease interceptor, generally a larger tank. Existing food-service establishments need approved grease-control equipment unless Metro grants a variance. New facilities, upgrades, and ownership changes require a FOG plan and Metro review.
Apply the correct cleaning schedule
Grease interceptors require complete cleaning no less often than every 90 days unless Metro approves otherwise. A qualifying device with approved monitoring can receive a longer interval, but never longer than 180 days. A full pump-out is also required when combined FOG and solids reach 25% of the overall liquid depth.
Grease traps require complete removal of FOG and food solids at least every 30 days. If a trap is above 25%, it must be cleaned every two weeks or often enough to remain below that level.
Certification, hauler, and records
Grease-control equipment must be inspected and certified annually by a Metro-approved inspector. Pumping must use a Metro-approved grease-waste hauler, which completes the full clean-out and service record. Keep maintenance records on site, available immediately on request, for at least three years. Records include the date, cleaning party, and gallons removed.
Compare Nashville service quotes
Metro does not publish a citywide contractor rate. Compare written quotes that identify the device as a trap or interceptor, capacity and access, complete clean-out, required schedule and certification work, Metro-approved-hauler status, service record, defect notes, exclusions, and total price.
A practical facility checklist
- Confirm the address is in the Metro Water Services program area.
- Identify whether the equipment is a grease trap or grease interceptor.
- Use the correct 30-day or 90-day baseline and service earlier at the 25% trigger.
- Arrange the annual Metro-approved certification.
- Use a Metro-approved hauler and keep records for at least three years.
Frequently asked questions
How often must a Nashville grease interceptor be cleaned?
Metro requires complete interceptor cleaning at least every 90 days unless it approves otherwise. Approved monitoring may allow a longer interval, but never longer than 180 days. A complete pump-out is also required when combined FOG and solids reach 25% of overall liquid depth.
How often must a Nashville grease trap be cleaned?
Metro requires complete removal from a grease trap at least every 30 days. If FOG and food solids are above 25%, clean every two weeks or as often as needed to remain below that threshold.
What service records are required in Nashville?
Records must include the date, the person or company doing the work, and the gallons removed. They must be available at the establishment immediately on request and kept for at least three years.
What does grease trap service cost in Nashville?
Metro Water Services does not publish a citywide cleaning rate. Get itemized quotes identifying the device, complete clean-out, record and certification work, access, and emergency or after-hours terms.
Official sources
- Metro Water Services — Grease Management
- Metro Water Services — FOG Management Policy
- Metro Water Services — Waste Haulers
Fact-checked August 17, 2026. Local rules, permits, and official guidance can change; confirm current requirements for the service address. General information only, not legal, plumbing, engineering, environmental, health, or safety advice.
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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