Grease traps for your food business
If your business produces greasy waste you will need to use a grease trap to stop fats, oils, grease and solids from getting into your sewer or septic tank.
The types of businesses that need a grease trap include:
- fast-food outlets
- bakeries including cake decorators
- takeaway stores
- care centres
You are responsible for checking and maintaining your grease trap.
If your grease trap connects to the sewer it must be an approved product meeting Power and Water Corporation guidelines.
Find out more including how to manage greasy food waste and other trade waste on the Power and Water website.
When to check your grease trap
You should check your grease trap at least every three months.
How to check your grease trap
There are some checks you can carry out to help maintain your grease trap.
Check the structure
You should check the structure for signs of the following:
- gaps in the lid that insects or mammals can squeeze through
- cracks or chips in the lid or on the walls of the grease trap
- decayed internal walls
- missing baffle plates.
Check for rodent activity
Grease traps make a good shelter for rodents. You should check around the grease trap for signs of rodent activity.
Plumbing fittings that connect to the grease trap can provide a way for rodents to enter the building.
You should also check if the grease trap is level. Rodents digging out underneath can disrupt the foundations and make the grease trap slant over.
This can lead to problems including:
- causing the grease trap to short circuit
- blocked drains
Check for strong smells
All grease traps smell bad when the surface is disturbed. When the lid is down it should not be overly powerful.
If there is a powerful smell with the lid down you should consider getting it cleaned out.
You should get advice from your contractor about the condition of your grease trap
Clean your grease trap
You must get a qualified waste handler to clean out your grease trap.
You can contact Power and Water Corporation's Trade Waste Department by calling 1800 245 092 or emailing email@example.com.
Last updated: 28 July 2020
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