Prepared by GreaseTrapLocator · Fact review: August 16, 2026
Boston's local cleaning guidance
BWSC says restaurants and food establishments need properly installed and maintained grease traps. Clean when grease or oil reaches 25% of the trap's liquid level.
BWSC's page says point-of-use traps should be cleaned at least monthly and large in-ground interceptors quarterly, but it separately says a grease trap should be completely emptied at least once a month. Because those calendar statements overlap, do not assume a quarterly visit alone satisfies the direction for a particular large device. Confirm the interval with BWSC and service sooner when the 25% point or the equipment's needs require it.
Follow the manufacturer's instructions. BWSC says not to add bleach, emulsifiers, enzymes, or other chemicals to the trap; only bacteria approved by BWSC may be added.
Use the BWSC Grease Control Log
The establishment owner should record each cleaning on the BWSC Grease Control Log. The log records the date, amount removed, and a signature confirming the work, and it must be available for BWSC personnel. BWSC warns that failure to maintain the log can lead to monetary penalties, but its public log does not state a dollar amount or a universal multiyear retention period.
Plan new or altered work with BWSC
BWSC says grease traps or interceptors are required for restaurants and commercial food-handling establishments. Sewer submissions for this work go to BWSC Enforcement for review and approval. Confirm the design and plumbing requirements before installing or changing a device.
Compare Boston service quotes without a made-up price
BWSC does not publish a standard contractor rate. Ask for a written, itemized quote identifying the device and capacity, access conditions, cleaning method, material removed, service record, scheduling, disposal arrangement, exclusions, and total price.
Do not assume a septic-system hauler rule, insurance minimum, emergency multiplier, neighborhood surcharge, or fixed fine applies to a public-sewer facility unless the responsible authority or provider supplies current written support.
A practical facility checklist
- Service at the 25% grease-or-oil level, even if the device's minimum calendar interval has not arrived.
- Confirm the calendar interval for the actual device with BWSC because its published page contains overlapping monthly and quarterly statements.
- Record the date, amount removed, and confirming signature on the BWSC Grease Control Log.
- Keep the log available for BWSC personnel.
- Send new or altered sewer-device submissions to BWSC Enforcement for review.
Frequently asked questions
When does BWSC say a Boston grease trap should be cleaned?
BWSC says to clean when grease or oil reaches 25% of the trap's liquid level. Its page gives overlapping monthly and quarterly calendar statements for different device descriptions, so confirm the interval for the actual device with BWSC and service sooner if the 25% point is reached.
What records should a Boston food establishment keep?
Use the BWSC Grease Control Log to record the cleaning date, amount removed, and a signature confirming the work, and keep the log available for BWSC personnel.
Does BWSC publish a standard Boston cleaning price?
No. BWSC publishes maintenance and compliance guidance, not contractor rates. Compare written, itemized quotes for the actual device and site.
Who handles a new or altered Boston grease-trap project?
BWSC says the required sewer submission should go to BWSC Enforcement for review and approval. Confirm plumbing and other project requirements before work begins.
Official sources
- BWSC — Commercial Kitchen Grease Trap Guidelines
- BWSC — Grease Control Log
- BWSC — Sewer Requirements
Fact-checked August 16, 2026. Local rules, permits, and official guidance can change; confirm the current direction 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.
Find local contractors who handle cleaning, pumping, and FOG compliance — in your area.