How Often Should You Clean Your Grease Trap in Melbourne?

How Often Should You Clean Your Grease Trap in Melbourne?

If you operate a commercial kitchen in Melbourne, maintaining your grease trap is not optional — it is a legal requirement under EPA Victoria regulations and your local council’s trade waste agreement. But one of the most common questions we hear from restaurant owners, café operators, and food service managers is: how often should a grease trap be cleaned?

The answer depends on several factors, including your business type, the size of your trap, your cooking volume, and the types of food you prepare. In this comprehensive guide, we break down everything Melbourne businesses need to know about grease trap cleaning frequencies.

The 25% Rule: Melbourne’s Baseline Standard

EPA Victoria and most Melbourne water authorities enforce what is known as the 25% rule. This means your grease trap must be cleaned before fats, oils, and grease (FOG) accumulate to more than 25% of the trap’s total capacity. Once FOG levels exceed this threshold, your trap is no longer functioning effectively, and you risk non-compliance with your trade waste agreement.

Regular monitoring is essential to ensure you never exceed this limit. Our cleaning schedule calculator can help you estimate the ideal frequency based on your specific setup.

Recommended Cleaning Frequencies by Business Type

Restaurants and Bistros

Full-service restaurants that prepare fried, grilled, or sautéed dishes typically generate high volumes of FOG. Most Melbourne restaurants require grease trap pump-outs every 4 to 6 weeks. High-volume establishments — particularly those specialising in Asian, Indian, or Mediterranean cuisines with heavy oil use — may need cleaning as frequently as every 2 to 3 weeks.

Cafes and Coffee Shops

Cafes with limited cooking (primarily toasted sandwiches, light breakfasts) usually produce less FOG. A cleaning schedule of every 6 to 8 weeks is typical, though cafes serving full brunch menus should consider more frequent service.

Fast Food and Takeaway Outlets

Deep fryers are the single largest contributor to FOG buildup. Fast food outlets with multiple fryers often need pump-outs every 2 to 4 weeks, depending on trap size and daily throughput.

Bakeries and Patisseries

Bakeries that use butter, cream, and cooking oils in large quantities should schedule cleaning every 4 to 6 weeks. Those with retail counters serving hot food may need more frequent service.

Hotels and Function Centres

Large-scale commercial kitchens in hotels and function venues often have bigger grease traps (1,000 litres or more) but also produce significant FOG volumes during events. A schedule of every 4 to 8 weeks is common, with additional pump-outs scheduled around peak event seasons.

Aged Care Facilities and Hospitals

Institutional kitchens typically operate on predictable schedules with consistent menus. Cleaning every 6 to 8 weeks is standard, though facilities should monitor FOG levels regularly.

Factors That Affect Cleaning Frequency

Trap Size

Grease traps in Melbourne range from small under-sink units (40–80 litres) to large in-ground traps (1,000–5,000+ litres). Smaller traps fill faster and require more frequent cleaning. If your trap is undersized for your operation, you may want to discuss upgrading with your plumber or pump-out service provider.

Cooking Volume and Methods

The more you cook — and the more oil-intensive your methods — the faster your trap fills. Deep frying, wok cooking, and griddle use all produce high FOG output. Businesses that primarily steam, boil, or bake will see slower accumulation.

Number of Meals Served

A restaurant serving 50 covers per night will need less frequent cleaning than one serving 300. Seasonal fluctuations matter too — Melbourne’s busy summer dining season and major events like the Australian Open or Melbourne Cup can significantly increase your output.

Pre-Treatment Practices

Good kitchen practices can extend the time between professional cleans. Scraping plates before washing, using sink strainers, and never pouring oil directly down drains all reduce the load on your grease trap. For more tips, see our guide on grease trap maintenance tips for commercial kitchens.

Warning Signs You’re Not Cleaning Often Enough

Even with a set schedule, conditions can change. If you notice any of the following, it may be time to increase your cleaning frequency:

• Foul odours coming from drains or the trap area
• Slow-draining sinks in the kitchen
• Visible grease buildup around the trap lid
• Pest activity near the trap (cockroaches and rodents are attracted to FOG)
• Failed council inspections

If you are experiencing any of these issues, read our detailed article on warning signs your grease trap needs cleaning for immediate guidance.

The Consequences of Infrequent Cleaning

Failing to maintain your grease trap on a proper schedule can lead to serious consequences for Melbourne businesses:

• Council fines: Non-compliance with trade waste agreements can result in penalties from your local water authority
• EPA Victoria enforcement: Serious environmental breaches, such as FOG entering stormwater drains, can attract significant fines
• Blocked drains: Solidified grease causes costly blockages that can shut down your kitchen
• Health code violations: Overflowing or malfunctioning traps create hygiene risks that can trigger closure orders
• Reputation damage: Foul smells and pest issues drive customers away

Setting Up a Scheduled Maintenance Plan

The most reliable way to stay compliant and avoid emergency situations is to establish a scheduled maintenance plan with a professional grease trap cleaning service. A good plan includes:

• Regular pump-outs at intervals suited to your business
• FOG level monitoring between services
• Compliance documentation and certificates for council records
• Priority scheduling during peak periods
• Adjustable frequency as your business needs change

Understanding the Professional Cleaning Process

Knowing what happens during a professional grease trap clean can help you appreciate why regular service matters. The process involves far more than simply pumping out waste — it includes inspection, scraping, flushing, and verification. Learn exactly what is involved in our step-by-step guide to the grease trap cleaning process.

Get Your Cleaning Schedule Right

Every Melbourne kitchen is different, and there is no single answer to how often you should clean your grease trap. The key is to understand your operation’s FOG output, comply with the 25% rule, and work with professionals who can tailor a schedule to your needs.

Use our cleaning schedule calculator to get a personalised recommendation, or contact our team to arrange an on-site assessment. We provide professional grease trap pump-outs across Melbourne with full compliance documentation and flexible scheduling to suit your business.