Grease trap rules for Auckland food businesses

Start with the premises and the approval pathway

A food business should organise grease control around its actual kitchen and wastewater discharge. Discuss grease trap assessment before purchasing equipment or changing the layout. Bring the existing approval papers, equipment details and service agreement to that discussion. For a new operator taking over a fitted kitchen, ask for these records during the handover rather than treating the installed unit as the whole compliance file.

Watercare’s commercial cooking fats guidance separates the approval roles. Auckland Council assesses applications against the Building Code; Watercare assesses them against the Auckland Trade Waste Bylaw 2013. Watercare identifies G13/AS2 as an acceptable solution for grease traps and says grease interceptors and digesters are alternative devices needing its approval. Ask your designer to identify the proposed pathway in the application documents.

Where Council asks you to seek approval for a trap or converter, Watercare publishes a specific submission process: provide a statement from the grease converter supplier and a copy of the service agreement. The statement must address meeting the bylaw requirements when correctly installed and maintained. Watercare gives tradewasteinfo@water.co.nz as the contact for that material and says a compliance advisor will respond with an approval letter.

Keep the discussion specific to the discharge. Tell the designer about cooking processes, connected appliances, washing arrangements and intended changes. Ask what trade-waste requirements apply to this operation and which information Watercare needs to assess it. The plumbing quote comparison guide can help you separate design advice, supply, installation and ongoing servicing in proposals from different providers.

Have sizing explained rather than selecting by footprint

Watercare’s public cooking-fats page points to the Building Code route rather than giving a universal capacity for every Auckland kitchen. Have the designer explain the sizing basis, the fixtures included and how the proposed model fits the selected approval pathway. A compact unit that fits under a bench still needs a documented design and approval assessment for the proposed use.

Prepare a schedule showing the fixtures and appliances intended to discharge through the device. Record the proposed kitchen operating pattern and give the designer the manufacturer’s information for equipment being selected. Ask which inputs drive the sizing calculation and have those inputs checked against the final layout. This is a design briefing task, not a reason to choose a tank from a generic restaurant label.

For an existing premises, compare the current kitchen with the approved arrangement. A menu change, extra washing equipment or a refit should prompt a review of the discharge information supplied to the designer. Ask them whether the existing device and servicing arrangement suit the changed operation. Retain their written explanation with the layout so future managers know what was assessed.

Watercare’s customer contract says it can require a grease trap or another device where circumstances require it, and that a required device must be installed and maintained in good working order by the customer. Use that obligation as the starting point for allocating tasks between operator and property manager. Write down who arranges assessment, approves installation work, books cleaning and receives the service records.

Build servicing around effective operation and kitchen habits

Watercare recommends commercial cleaning of grease traps regularly. Its fats, oils and grease brochure says cleaning should occur as often as needed for effective operation. Set the arrangement with the service provider using the installed device, its instructions and any premises-specific approval conditions. Keep the schedule in the kitchen management file and identify who checks that booked visits actually happen.

Ask the service provider what their visit covers and what information the completion record will contain. Request an account of the work carried out, observed condition, any defects needing attention and the recommended next visit. Those are practical management records. A cleaning invoice is easier to interpret when it also identifies the serviced device and gives the operator an action list.

Grease control begins before wastewater reaches the trap. Watercare advises collecting fats, oils and grease in a covered container for a commercial collector, and using a commercial service for ventilation-hood filter cleaning. Its brochure also promotes scraping and wiping food residue before washing. Put collection containers and scraping facilities where staff use them, then explain the process during kitchen induction.

Use the following routine to connect servicing with daily kitchen management. The aim is to assign each action to a named person, with a clear route for reporting faults. If drainage symptoms develop, the blocked drain first-call guide helps organise the information needed for the initial report.

1. Locate the approved device details, supplier instructions, service agreement and any discharge conditions.
2. Confirm the cleaner’s access arrangements and who receives the service report after each attendance.
3. Train staff to separate cooking fats and food residue from wash water using the agreed collection process.
4. Log drainage symptoms and servicing observations, then ask the provider to review unresolved issues.

Keep a working record rather than a folder of invoices

Keep the approval letter, supplier statement and service agreement together because these are the documents Watercare names in its published approval process. Add the approved layout and equipment information so the file explains what was accepted, not merely which product was bought. Store a copy that remains available when the kitchen manager changes or the business transfers to a new operator.

For day-to-day management, maintain a service log recording attendance dates, contractor details, device identification, findings and follow-up actions. Attach service reports and waste-collection documentation supplied by your providers. Treat this as a recommended operating record; use the business’s actual approval conditions and agreements to confirm any mandatory reporting or retention requirements. Ask Watercare directly where those documents leave an unresolved requirement.

When a service report identifies a problem, record who will arrange the response and attach the completion evidence when it is resolved. Tell the cleaner about recurring slow drainage instead of filing the report in isolation. If a repair proposal involves drainlaying or plumbing, follow PGDB advice on checking the current licence and relevant authorisation of the person undertaking that work.

Before taking over premises or approving a refit, review the records with the operator, property manager and relevant advisers. Resolve missing documents and responsibility gaps while the kitchen plan can still be adjusted. Discuss grease trap work with Stately using the existing device information, operating details and approval correspondence, then agree a defined assessment or installation scope and the ongoing servicing responsibilities.