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Grease Trap Overflow: Immediate Steps A grease trap overflow is a serious situation that needs immediate attention. Here’s what to do:

Step 1: Stop Water Flow Immediately stop all water-using activities in the kitchen — turn off dishwashers, stop washing in sinks, and avoid using floor drains. Continuing to run water will worsen the overflow and push more FOG into the sewer system.

Step 2: Contain the Spill Use absorbent materials (towels, mats, absorbent granules) to contain any spilled grease or wastewater. Prevent the overflow from reaching stormwater drains, gutters, or outdoor areas — grease entering stormwater is an environmental offence under EPA Victoria regulations.

Step 3: Call for Emergency Service Contact Melbourne Grease Trap Cleaning and we’ll pass your urgent enquiry to a local contractor straight away, and they can tell you how quickly they can get to you. The contractor can fully pump out and clean your trap to get your kitchen back online.

Step 4: Document the Incident Take photos of the overflow and any affected areas. Note the time, date, and circumstances. This documentation may be needed if the overflow triggered a sewer blockage or environmental incident that your water authority or EPA Victoria investigates.

Step 5: Prevent Recurrence After the emergency is resolved, ask the contractor about a scheduled maintenance plan. Most overflow emergencies are caused by inadequate cleaning frequency. A regular maintenance schedule prevents the FOG buildup that leads to overflows, saving you the stress and cost of emergency situations.

Grease trap emergency? Contact us now and we’ll pass your enquiry on straight away.

Sizing a Grease Trap for Your Restaurant Getting the right grease trap size is critical. An undersized trap fills too quickly, exceeds the 25% FOG threshold, and puts you at risk of non-compliance and blockages. An oversized trap wastes money on unnecessary capacity. Here’s how sizing works:

AS 4494 Sizing Method Australian Standard AS 4494 provides the calculation method for grease trap sizing. The key inputs are:

Fixture units: Each kitchen fixture (sinks, dishwashers, floor drains) has an assigned fixture unit value based on its flow rate Peak flow rate: The maximum simultaneous water flow from all connected fixtures Retention time: The time wastewater spends in the trap, allowing FOG to separate Menu type: Grease-heavy menus (fried food, charcoal grill) require larger traps than lighter cooking styles General Restaurant Guidelines Small cafe or takeaway (1-2 sinks, 1 dishwasher): 500-1,000 litres Standard restaurant (3-4 sinks, 1-2 dishwashers, floor drains): 1,000-2,000 litres Large restaurant or pub bistro: 2,000-3,000 litres Hotel kitchen or food court: 3,000-5,000+ litres These are rough guides only. Your water authority — City West Water, South East Water, or Yarra Valley Water — may have specific sizing requirements that override general calculations. A licensed plumber should perform the formal AS 4494 sizing calculation, and our grease trap size calculator can help you understand your requirements before engaging a plumber.

Grease Trap Installation Timeline The time required for grease trap installation depends on the trap type, your site conditions, and the approval process. Here’s what to expect:

Installation Timelines Above-ground traps: Typically installed in one day. These units connect directly to existing plumbing and don’t require excavation. In-ground traps: One to three business days for installation, depending on excavation requirements, site access, and trap size. Triple interceptor systems: Two to three business days, including excavation, installation, and plumbing connections. AGRUs: One to two days for installation, plus commissioning and programming of the automatic cycle. The Approval Process Before installation can begin, you’ll need Trade Waste Agreement approval from your water authority (City West Water, South East Water, or Yarra Valley Water), which can take two to six weeks. You may also need a plumbing permit, and some installations require council planning approval. We recommend starting the approval process well before your target installation date.

What Affects the Timeline Factors that can extend the installation timeline include difficult site access, rock or high water table during excavation, complex plumbing modifications, heritage building restrictions, and coordination with other trades during a kitchen fit-out. Ask for a realistic timeline at the site assessment so you can plan your kitchen opening or renovation.

A full installation covers site assessment through commissioning and documentation, so your new trap complies with AS 4494 and your water authority’s requirements.

Grease Trap vs Grease Interceptor: What’s the Difference? The terms “grease trap” and “grease interceptor” are often used interchangeably in Australia, but they can refer to different things depending on context:

Grease Traps (Point-of-Source) In some classifications, a “grease trap” refers to a smaller, point-of-source device installed directly under a sink or at a specific fixture. These are typically above-ground units with capacities from 40 to 500 litres. They intercept FOG from individual fixtures before it enters the broader drainage system. They require more frequent cleaning due to their smaller capacity.

Grease Interceptors (Main Line) A “grease interceptor” typically refers to a larger, in-ground unit installed on the main drainage line, capturing FOG from all kitchen fixtures collectively. These are usually 1,000 litres or larger and include triple interceptor designs. They handle the total FOG output from an entire kitchen and are cleaned less frequently due to their greater capacity.

In Practice In Melbourne, most plumbers, water authorities, and EPA Victoria use the terms interchangeably. What matters for compliance is that your grease management device meets AS 4494 standards, is appropriately sized for your kitchen, is specified in your Trade Waste Agreement, and is maintained to keep FOG levels below the 25% threshold. Whether it’s called a trap or an interceptor, the compliance requirements are the same, and we take enquiries for all types.

Choosing the Right Grease Trap for Your Kitchen The right grease trap depends on your kitchen’s size, output volume, available space, and your water authority’s Trade Waste Agreement conditions. Here’s a guide to the main options:

Grease Trap Types In-ground grease traps (1,000-5,000+ litres): Best for high-volume restaurants, food courts, and hotels. Installed below ground, these large-capacity traps handle heavy FOG loads and require monthly to bi-monthly professional cleaning. Above-ground grease traps (40-500 litres): Best for smaller cafes, retrofit installations, and kitchens without space for in-ground traps. Require more frequent cleaning due to smaller capacity. Triple interceptor traps (1,000-4,000 litres): The standard choice for most commercial kitchens. Three-chamber design provides effective FOG separation. Automatic Grease Removal Units (AGRUs): Best for large hotels, hospitals, and high-output kitchens. Self-skimming with periodic professional servicing. Passive gravity traps (40-1,000 litres): Best for smaller operations like cafes and bakeries. Simple design with weekly manual cleaning plus monthly professional service. Sizing Your Trap Grease trap sizing is calculated under AS 4494, based on the number and type of kitchen fixtures, peak flow rates, and your menu type. Your water authority may also have minimum size requirements. We recommend consulting with a licensed plumber and your water authority to determine the correct trap size for your operation.

Signs Your Grease Trap Needs Cleaning While the best approach is a scheduled maintenance plan that prevents problems before they start, there are clear warning signs that indicate your grease trap needs immediate attention:

Warning Signs Slow-draining sinks: When kitchen sinks, dishwashers, or floor drains are draining slowly, it often means FOG is restricting flow through the trap Foul odours: Unpleasant smells coming from drains or near the grease trap indicate decomposing FOG and food waste Grease visible in drains: If you can see grease around drain openings or floating in sink water, the trap is likely full Gurgling sounds: Air trapped behind grease blockages causes gurgling noises in drains Overflow or pooling: Water pooling near the grease trap or overflow from access points means immediate cleaning is needed Pest activity: Increased cockroach or rodent activity around drains and the trap area can indicate grease accumulation Checking FOG Levels For above-ground traps, you can visually check FOG levels by opening the lid and observing the grease layer. For in-ground traps, a simple dipstick test — inserting a clean stick to the bottom and observing the grease and solids marks — gives you a quick reading. If the combined FOG and solids depth exceeds 25% of the total liquid depth, arrange professional cleaning immediately.

The safest approach is a scheduled maintenance plan that ensures your trap is cleaned before reaching the critical 25% threshold, preventing all of these warning signs from ever occurring.

Can You Clean Your Own Grease Trap? While you can perform basic daily and weekly maintenance on your grease trap, you cannot legally perform a full pump-out yourself. Here’s why:

What You Can Do Kitchen staff can and should perform regular minor maintenance, including skimming surface grease from above-ground traps, emptying strainer baskets and removing food solids, wiping down accessible internal surfaces, and monitoring FOG levels between professional services. This routine maintenance extends the time between professional cleans and helps keep your trap operating efficiently.

What Requires a Professional A full grease trap pump-out must be performed by an EPA-licensed waste transporter. This is because grease trap waste is classified as industrial waste under Victorian law, and its collection, transport, and disposal are regulated by EPA Victoria. You cannot legally remove grease trap waste from your premises and dispose of it yourself. Doing so — for example, pouring grease waste down the drain, into stormwater, or into general waste bins — is an environmental offence that can result in prosecution and substantial fines.

Waste Transport Certificate Requirement Every pump-out requires a Waste Transport Certificate completed by the licensed transporter. This certificate is your compliance evidence for water authority audits. Without it, you cannot demonstrate that your grease trap waste was lawfully removed and disposed of. This documentation can only be issued by an EPA-licensed operator.

What’s Included in a Professional Grease Trap Clean A professional grease trap cleaning service is a comprehensive process that goes well beyond simply pumping out waste. Here’s what every service includes:

The Cleaning Process Pre-service inspection: The technician assesses the trap condition, measures FOG levels, and photographs the pre-clean state for documentation Full pump-out: All fats, oils, grease, sludge, and wastewater are removed using vacuum tanker equipment High-pressure cleaning: Internal walls, baffles, chambers, and connecting pipes are cleaned with high-pressure water jets to remove all adhered grease Component inspection: Baffles, tee pieces, seals, lids, and structural elements are inspected for damage or wear Inlet and outlet check: Connecting pipes are checked for blockages, grease buildup, and structural integrity Post-clean documentation: After-clean photos, FOG level measurements, and condition notes are recorded Documentation You Receive Waste Transport Certificate: Legally required EPA documentation for every pump-out Service report: Detailed record of work performed, trap condition, and any issues identified Photographic evidence: Before-and-after images for your compliance files Recommendations: Advice on any maintenance, repairs, or schedule adjustments needed Ask for a service by EPA-licensed technicians, with all waste transported to approved receival facilities. This comprehensive approach ensures your trap is not just clean, but fully inspected and documented for compliance.

Maintenance Plans vs One-Off Cleaning: Cost Comparison In almost every case, a scheduled maintenance plan is significantly cheaper than relying on ad-hoc one-off grease trap cleaning. Here’s why:

Direct Cost Savings Maintenance plan clients receive discounted per-service rates compared to one-off bookings. Over a year of regular cleaning, these savings add up to 30-40% less than paying full price for each individual service. The exact saving depends on your cleaning frequency and trap size, but the economics consistently favour planned maintenance.

Avoided Emergency Costs Without a regular cleaning schedule, grease traps are far more likely to overflow or cause blockages — triggering expensive emergency callouts. Emergency services typically cost two to three times more than a scheduled clean, and after-hours emergencies cost even more. A maintenance plan virtually eliminates emergency callout risk.

Compliance Cost Avoidance Non-compliance with your Trade Waste Agreement can result in penalty charges, increased trade waste fees, and fines from your water authority or EPA Victoria. These costs can run into thousands of dollars. A maintenance plan keeps you compliant automatically, avoiding these entirely preventable expenses.

What’s Included at No Extra Cost Maintenance plans include priority booking, compliance tracking, digital record access, annual compliance summary reports, and automated scheduling reminders — all included in the plan price. One-off customers pay the standard rate without these additional benefits. For most Melbourne food businesses, a maintenance plan is the clear winner on cost, convenience, and compliance.

Grease Trap Cleaning Costs in Melbourne Grease trap cleaning costs in Melbourne vary depending on several factors. Here’s a general guide to help you budget:

Standard Pricing Standard pump-out and clean: From $230+GST for traps up to 1,000 litres Triple interceptor cleaning: From $350+GST for three-chamber systems Drain and line cleaning: From $180+GST Maintenance plans: From $180/month for scheduled regular service Emergency callouts: Pricing varies — call for a quote Factors That Affect Cost Several factors influence the final price of your grease trap service:

Trap size: Larger traps require more time and tanker capacity Trap type: In-ground traps, triple interceptors, and AGRUs each have different service requirements Access difficulty: Tight laneways, basement access, or long hose runs may add to service time Condition: Heavily fouled traps that haven’t been cleaned recently may require additional work Location: Outer suburban locations may incur travel surcharges Scheduling: After-hours and emergency services are priced differently from standard bookings Value of Maintenance Plans Maintenance plan clients typically save 30-40% annually compared to ad-hoc one-off bookings. Plans also include priority scheduling, compliance tracking, and digital record access at no extra cost. The cost of a maintenance plan is almost always less than a single emergency callout.

EPA Victoria Grease Trap Requirements EPA Victoria regulates the management of grease trap waste as industrial waste under the Environment Protection Act. Key requirements that apply to all Melbourne food businesses with grease traps include:

Licensed Waste Transport Grease trap waste must be collected and transported by an EPA-licensed waste transporter. Using an unlicensed operator is an offence that can result in fines for both the business and the transporter. Always verify that your grease trap cleaning company holds a current EPA transport licence.

Waste Transport Certificates A Waste Transport Certificate must be completed for every grease trap pump-out. This certificate records the waste type, volume, generator details, transporter details, and receival facility. Copies must be retained by the waste generator (you), the transporter, and the receival facility for a minimum of three years.

Approved Disposal Grease trap waste must be disposed of at EPA-approved receival facilities. Illegal dumping of grease trap waste carries severe penalties including fines and prosecution.

IWRG421 Guidelines EPA Victoria’s Industrial Waste Resource Guidelines (IWRG421) provide the framework for grease trap waste management. These guidelines specify waste classification, handling requirements, transport conditions, and disposal standards. Compliance with IWRG421 is referenced in most water authority Trade Waste Agreements.

Your Obligations As a food business operator, you must ensure your grease trap is maintained to prevent environmental harm, use only EPA-licensed transporters, retain Waste Transport Certificates, and cooperate with any EPA investigations or audits. Ask the contractor for their EPA Victoria permit details and compliant documentation on every service.

Trade Waste Agreements for Melbourne Food Businesses Yes, if your business operates a commercial kitchen that discharges trade waste — including fats, oils, and grease — into the sewer system, you are legally required to hold a Trade Waste Agreement with your local water authority.

Which Water Authority? Melbourne has three water authorities that manage trade waste:

City West Water: Covers the CBD, Docklands, Southbank, Footscray, Werribee, and Melbourne’s western suburbs South East Water: Covers South Yarra, St Kilda, Prahran, Dandenong, Glen Waverley, and Melbourne’s south-eastern suburbs Yarra Valley Water: Covers Fitzroy, Carlton, Richmond, Brunswick, Box Hill, and Melbourne’s northern and eastern suburbs What a Trade Waste Agreement Covers Your Trade Waste Agreement specifies the conditions under which you can discharge trade waste, including the type and size of grease trap required, minimum cleaning frequencies, discharge quality limits, record-keeping requirements (including Waste Transport Certificate retention), and access provisions for water authority inspectors.

Operating Without an Agreement Operating a commercial kitchen without a Trade Waste Agreement is illegal. Water authorities can issue fines, demand immediate compliance, and in extreme cases, restrict your water and sewer services. If you’re unsure about your Trade Waste Agreement status, contact your water authority, or see our trade waste agreement guide for the application process.

Consequences of Neglecting Grease Trap Maintenance Failing to maintain your grease trap in Melbourne carries serious operational, financial, and legal consequences. Here’s what can happen:

Immediate Operational Problems Drain blockages: Grease accumulation leads to slow drains and eventually complete blockages, backing wastewater into your kitchen Foul odours: Decomposing FOG and food waste produce extremely unpleasant smells that affect your customers and staff Kitchen flooding: Blocked drains and overflowing traps can flood kitchen floors, forcing you to close during clean-up Pest attraction: Grease buildup attracts cockroaches, rodents, and other pests Financial & Legal Consequences Water authority fines: City West Water, South East Water, and Yarra Valley Water can issue infringement notices and penalty charges for non-compliance with your Trade Waste Agreement EPA Victoria prosecution: Causing environmental harm through grease discharge can lead to prosecution under the Environment Protection Act, with fines exceeding $9,000 for individuals and significantly more for corporations Increased trade waste charges: Non-compliant businesses may face higher ongoing trade waste fees Trade Waste Agreement suspension: In serious cases, your agreement can be suspended, meaning you cannot legally operate your kitchen Emergency repair costs: Sewer damage caused by grease blockages can result in expensive repair bills Prevention through regular professional maintenance is always far cheaper than dealing with the consequences of neglect.

The 25% Grease Trap Rule Explained The 25% rule is a critical compliance threshold for grease trap management in Melbourne. It states that the combined depth of fats, oils, and grease (FOG) floating on the surface and solids settled at the bottom of your grease trap must not exceed 25% of the trap’s total liquid depth.

This rule is enforced by Melbourne’s water authorities — City West Water, South East Water, and Yarra Valley Water — as part of your Trade Waste Agreement, and aligns with EPA Victoria’s Industrial Waste Resource Guidelines (IWRG421).

How It Works in Practice For example, if your grease trap has a total liquid depth of 1,000mm, the combined FOG and settled solids layer must not exceed 250mm. When this threshold is reached, the trap’s ability to separate grease from wastewater is compromised, and untreated FOG can pass through to the sewer system.

What Happens If You Exceed 25% Exceeding the 25% threshold can result in grease passing through to the sewer (causing blockages and environmental contamination), infringement notices from your water authority, penalty charges and increased trade waste fees, and potential prosecution under EPA Victoria regulations. Regular professional cleaning is the only reliable way to ensure your trap stays within this critical limit.

Grease Trap Cleaning Frequency in Melbourne The required cleaning frequency for your grease trap depends on several factors: your trap’s size, your kitchen’s output volume, the type of food you prepare, and the conditions set by your water authority’s Trade Waste Agreement.

As a general guide, most commercial kitchens in Melbourne need professional grease trap cleaning on the following schedule:

Monthly: High-output restaurants, fast food outlets, hotels, food courts Bi-monthly: Standard restaurants, pubs, catering kitchens, aged care facilities Quarterly: Smaller cafes, bakeries, childcare centres, school canteens Weekly: Food manufacturing plants, large above-ground units Regardless of schedule, EPA Victoria requires that FOG levels never exceed 25% of your trap’s depth. If your trap reaches this threshold before your next scheduled clean, you must arrange an immediate pump-out. Your water authority — City West Water, South East Water, or Yarra Valley Water — may specify minimum cleaning frequencies in your Trade Waste Agreement, and these conditions are legally binding.

We recommend an initial assessment to determine the optimal frequency for your specific operation, as over-cleaning wastes money while under-cleaning risks non-compliance.