How Often Should a Grease Trap Be Cleaned in a Restaurant or Commercial Kitchen?

Grease trap maintenance is critical for every commercial kitchen, and most grease trap systems should be cleaned every 1 to 3 months, depending on how much fat, oil, and grease your operation produces and local municipal regulations. Cleaning at least quarterly helps prevent blockages, foul odours, plumbing issues, and costly compliance violations. High-volume or high-grease kitchens may require monthly or even weekly servicing to stay efficient and fully compliant.

Standard Grease Trap Cleaning Frequency

Across restaurants and food service facilities, the generally accepted guideline is to clean grease traps every 1–3 months. Many municipalities mandate cleaning at least every 90 days, regardless of fill level, to comply with health and water regulations. High-output kitchens such as fast food outlets or establishments that fry frequently produce more fats, oils, and grease (FOG), which fill traps faster and require more frequent cleaning. Smaller cafés or low-grease operations may manage on a quarterly schedule if their output is minimal.

A practical industry rule is the “25% rule”: when grease and solids reach roughly one-quarter of the trap’s capacity, it’s time to clean it, regardless of how much time has passed. This ensures the system continues to function effectively and prevents grease from overflowing into your plumbing network.

Why Regular Grease Trap Cleaning Matters

Routine grease trap maintenance protects your kitchen’s plumbing system and helps prevent slow drains, sewage backups, and unpleasant odours. When FOG is left to build up, it can cause serious blockages that disrupt operations and may result in fines or penalties for non-compliance with environmental and health regulations. Staying on a scheduled cleaning plan is not just best practice; it is essential for uninterrupted service and legal compliance.

If you need professional fat and grease trap cleaning, contact Flush and Rush Plumbing, who are a trusted local plumbing company offering specialised commercial grease trap services to keep your kitchen compliant, efficient, and protected from costly blockages caused by an overloaded grease trap.