Grease Trap Interceptor: Make Sure Your Paperwork, Quote and Device All Name the Same Thing

The mistake most kitchens make is assuming everyone means the same device when they say "grease trap interceptor". Your agreement, your cleaner's quote and your plumber's drawings can each name a different unit. Then you pay to service the wrong one, or you skip the one that counts.

The steps below run in the order you would do them. Each takes minutes, and none needs a tradesperson.

1. Collect every document that names the device

Pull out your trade waste agreement, your last cleaning invoice, the most recent quote and any plumbing plans from your fit-out. Lay them on one bench. You want the exact words each one uses.

• "Grease trap"
• "Grease interceptor" or "grease interceptor trap"
• "Interceptor" with no other detail
• "Pit", "tank" or "arrestor"

In everyday talk these terms overlap. In a document they can point at different units, so note which word appears where.

2. Find the device and match it to the words

Walk the site and find what the paperwork describes. A small unit sits under or beside a sink. A larger one sits in the floor or outside, under a lid. Some kitchens have both. Photograph each lid and note what it serves.

If you cannot find the device your agreement names, stop and ask your landlord or the previous operator. Our guide on finding the grease trap before you sign covers the takeover case. If you want to know what you can handle yourself, read whether you can clean a grease trap yourself.

3. Read the agreement for the device it actually covers

Your trade waste agreement with the water authority sets the pump-out frequency for your kitchen. Many operators do not know theirs. Find the clause that describes the pretreatment device and check it matches the unit you found in step 2.

If your agreement names an in-ground interceptor and you only service a small under-sink unit, you have a gap. Water authorities such as Sydney Water publish their trade waste requirements. Check the current rules for your area rather than relying on an old copy.

4. List what flows to the device, and what it cannot hold

A grease interceptor separates fats, oils and grease from wastewater. It slows the water and lets it cool, so the grease rises to the top. Heat, strong detergents and emulsifiers push grease through to the sewer instead.

Ask yourself three questions at the dish area:

• Does hot dishwasher discharge reach the unit?
• Do you tip oil or pan scrapings down a sink?
• Do floor wastes in the cooking line drain to the same unit?

Dispose of used cooking oil separately. The NSW Environment Protection Authority sets out the state's rules for handling and disposing of waste, so check them before you decide where your used oil goes. The device is a last line of defence, not a bin.

5. Ask the quote to name the device, the size and the access

Cleaners price on four things: trap size, service frequency, access and disposal fees. That is why two kitchens with the same trap can get quite different prices. A quote that only says "grease trap clean" hides all four.

Ask each cleaner to write down:

• The device type, in the same words as your agreement
• The size or capacity they are working from
• Where they will access it and whether that access is clear
• The disposal fee, either included or listed separately

The Get 3 Grease Trap Quotes form collects this detail upfront, so every cleaner prices the same job. For a line-by-line method, see our quote comparison post.

6. Run the worked example before you choose

Take two cafes with identical in-ground interceptors. Cafe A has a clear lid in the back lane and a cleaner who knows the site. Cafe B has its lid under stacked pallets, and the cleaner has to move them first. The cleaner prices that delay in, so Cafe B pays more for the same device.

Now add the naming problem. Cafe B's quote says "grease trap clean" while its agreement says "interceptor". The cleaner services the small under-sink unit, and the in-ground one fills unnoticed. Naming the device on the quote removes that risk. Clearing the lid removes the extra charge.

The decision is simple. Choose the quote that names your device, covers disposal and states the access it expects.

7. Get the invoice to repeat the same words

After each clean, check that the invoice names the same device, the date and the disposal details. This record shows an inspector that the unit on your agreement is the unit being serviced. The Australian Building Codes Board publishes the plumbing code behind these requirements, and your local water authority sets trade waste conditions on top of it.

File the invoice with the agreement. Most operators only think about the trap when it smells, backs up, or a council or Sydney Water inspection is due. With matched paperwork, that inspection takes five minutes.

Get your quotes with the right device named

Grease Trap Quotes sends you three quotes from licensed cleaners by SMS, usually within about a minute of your request. We cover Sydney today and are expanding to other Australian cities. Get 3 Grease Trap Quotes, name your device in the request and compare like for like. To learn more, visit our homepage or read about GreaseTrapQuotes.

Are you a licensed cleaner? Apply to join GreaseTrapQuotes or see contractor territory pricing.

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Related reading: Grease Trap Servicing: What to Watch When the Lid Comes Off.

Related reading: Grease Trap Maintenance: Who Does What, and the Log That Keeps You Compliant.

Related reading: Grease Trap Servicing: The Three-Date Check That Tells You What to Do This Month.