How Australian food businesses maintain grease traps and drains: pump-out schedules, trade waste rules, the pest and odour link, and the records you must keep.
A grease trap (grease arrestor) captures fats, oils and grease before they enter the sewer. Australian food businesses generally must have one serviced on a set schedule by a licensed liquid-waste contractor under a trade waste agreement with their water utility or council. Poor maintenance drives blocked drains, foul odours and pests, and can breach both trade waste conditions and the Food Standards Code. Keep every service docket. Key takeaways: A grease arrestor is trade waste infrastructure: your water utility or council sets the pump-out frequency in a written trade waste agreement, and meeting it is a condition of your approval to discharge.. Pump-out intervals vary widely by arrestor size and wastewater volume, commonly from around monthly for busy kitchens to quarterly (or longer) for small, low-grease sites; confirm the exact frequency your provider has set for your premises.. Only a licensed liquid-waste contractor can legally pump out and dispose of grease trap waste, and in some areas (such as Sydney Water's Wastesafe program) the collection is electronically tracked.. Neglected traps and drains are a leading cause of blockages, sewer overflows, foul odours and pest activity, which can breach both trade waste conditions and the Food Standards Code 3.2.3.. Keep pump-out dockets, cleaning logs and your trade waste agreement on file; records are how you prove compliance to a trade waste officer or an environmental health officer.. Why grease trap and drain maintenance matters Every commercial kitchen produces fats, oils and grease (FOG) from cooking, washing up and cleaning. In warm water FOG flows freely, but as it cools in your pipes and the sewer it congeals and hardens. A grease arrestor is designed to slow the wastewater down so the grease floats to the top and heavy food solids settle to the bottom, allowing cleaner water to pass to the sewer. Once the trap fills with accumulated grease and sludge it stops working, and the FOG passes straight into your drains and the public sewer. The consequences are practical and expensive. Internally, an overloaded trap causes slow, smelly floor drains and gully traps, and eventually blockages and backflow into the kitchen. Externally, FOG is a major cause of sewer chokes and overflows across Australia. When a blockage is traced back to a business that has not maintained its trap, the business can generally be held liable for clean-up and repair costs, and can face enforcement action under its trade waste agreement. Check the specific liabilities and penalties that apply with your water authority. FOG that escapes the trap hardens in pipes and causes blockages and sewer overflows.. A full or poorly serviced trap loses its ability to separate grease, so it stops protecting your drains.. Blockages, odours and vermin from a neglected trap create food safety and amenity risks on the premises.. Businesses can generally be held responsible for costs and enforcement when their waste causes sewer problems.. What the law generally requires Two separate but overlapping regimes apply to most food businesses. First, the Australia New Zealand Food Standards Code (Standard 3.2.3, Food Premises and Equipment) requires food premises to have a sewage and waste water disposal system that effectively disposes of all sewage and waste water without ponding or backflow into the building, and in a way that does not jeopardise food safety on-site or off-site. The accompanying FSANZ guidance (Safe Food Australia) treats grease arrestors as part of that disposal system and generally recommends they be located and maintained so they do not contaminate food, attract pests or overflow. Standard 3.2.2 separately requires premises to be kept free of pests. Second, discharging greasy wastewater to the sewer is 'trade waste', which is regulated by your water utility or local council. You generally need a trade waste agreement or approval before you discharge, and that agreement typically specifies the pre-treatment equipment (the grease arrestor), how it must be maintained, and how often it must be pumped out. Requirements vary by jurisdiction and provider, so confirm what applies to you with your water authority or council and your state or territory food regulator. Food Standards Code 3.2.3 requires an effective waste water disposal system with no ponding or backflow into the building.. FSANZ guidance treats grease arrestors as part of that system and expects them to be maintained so they do not contaminate food or attract pests.. Discharging greasy wastewater to sewer is trade waste and generally needs an agreement or approval first.. The trade waste agreement usually sets the required pre-treatment, maintenance and pump-out frequency.. Requirements differ between states, utilities and councils, so always confirm locally.. Who regulates trade waste in Australia There is no single national trade waste authority. In the larger metropolitan areas, the water utility manages trade waste directly. Sydney Water covers greater Sydney; in Melbourne the retail water businesses (such as Yarra Valley Water, South East Water and Greater Western Water) manage it; in South East Queensland, Urban Utilities and the other distributor-retailers apply; in Perth, Water Corporation; and SA Water in South Australia. In many regional and rural areas, the local council acts as the water utility and issues liquid trade waste approvals, often guided at the state level (in NSW, for example, by the state's liquid trade waste regulation guidelines for local water utilities). Because the regulator differs by location, so do the forms, fees, categories and inspection practices. What is consistent is the underlying model: you apply to discharge, your premises and equipment are assessed, and you receive conditions that include a maintenance and pump-out regime. Contact your provider directly to confirm your category, your conditions and your approved list of waste contractors. Metro water utilities
How to keep your grease trap and drains compliant
Contact your water utility or council to confirm whether you hold a current trade waste agreement or approval, what category your business falls into, and what pre-treatment (grease arrestor) is required. If you do not have an agreement and you discharge greasy wastewater, arrange one before you continue trading.
Check the pump-out frequency nominated in your agreement. If none is set, or if trade has changed since it was set, ask your provider to assess or reassess it based on your arrestor size and wastewater volume. Do not simply guess an interval.
Arrange a recurring booking with a liquid-waste contractor licensed and approved by your provider (for example, a Wastesafe transporter in the Sydney Water area). Confirm they will do a full pump-out, not just skim the surface, and that they provide a disposal docket each visit.
Put strainers on all sinks and floor wastes, set up a used-oil collection drum, and roster daily scraping, strainer emptying and floor-drain flushing. Assign the tasks to named staff and add them to your cleaning schedule.
File each pump-out docket and record in-house drain cleaning as it happens. Keep the agreement, dockets and log together so they can be produced quickly at a trade waste audit or food premises inspection.
Each quarter, review your logs. If the trap fills before its scheduled pump-out, if you get recurring odours, or if you change your menu or volumes, ask your provider to reassess the frequency and update your routine.
Frequently asked questions
How often does a grease trap need to be pumped out in Australia?
There is no single national interval. Your water utility or council sets the frequency in your trade waste agreement based on your arrestor size and wastewater volume. In practice it commonly ranges from about monthly for busy kitchens to quarterly or longer for small, low-grease sites. Follow the frequency nominated for your premises and ask your provider to reassess it if trade changes.
Can I clean or pump out the grease trap myself?
Generally no. Full pump-out and disposal of grease trap waste must be done by a licensed liquid-waste contractor, and in some areas (such as Sydney Water's Wastesafe program) the collection is electronically tracked to a licensed facility. You can and should do daily drain care in-house, but the scheduled pump-out is a licensed contractor's job under your trade waste agreement.
Do I need a trade waste agreement for my cafe or restaurant?
If your business discharges greasy or food-related wastewater to the sewer, you generally need a trade waste agreement or approval from your water utility or council before you discharge. Most food outlets that cook or generate oily waste fall into a defined food-waste category requiring a grease arrestor. Requirements vary by provider, so confirm with your local water authority or council.
Who regulates grease traps and trade waste in my area?
It depends on location. In larger cities the water utility manages trade waste (for example Sydney Water, the Melbourne retail water businesses, Urban Utilities, Water Corporation or SA Water). In many regional areas the local council is the water utility and issues the approval. Contact your provider to confirm your conditions, category and approved contractors.
Why does my kitchen drain smell like sewage?
The most common causes are a grease trap that is overdue for pumping, so it can no longer separate waste, or a gully trap whose water seal has dried out and is letting sewer gas back into the room. Persistent odour usually signals a failing system rather than something to mask. Check your pump-out schedule, top up dry gully seals, and clean floor drains.
What records do I need to keep for grease trap maintenance?
Keep every pump-out docket showing the date, volume removed and disposal destination, plus your trade waste agreement and any changes to your pump-out frequency. Also maintain an in-house log of daily and weekly drain cleaning and any blockages. These records demonstrate compliance to trade waste officers and environmental health officers. Confirm the required retention period locally.