What is a Fatberg?

A fatberg is a rock-hard mass of waste matter in a sewer system formed by the combination of non-biodegradable solids, such as wet wipes, and grease or cooking fat. These underground monsters can grow larger than a commercial airliner, blocking entire sewage systems and costing millions to remove. While London has gained international notoriety for its spectacular fatbergs, Australian cities like Melbourne and Sydney face their own unique challenges with these sewer-clogging masses, made worse by our climate and ageing infrastructure in certain areas.

The composition of a fatberg follows a disturbingly simple formula: FOG (Fats, Oils, and Grease) acts as a binding agent that glues together wet wipes, sanitary products, cotton buds, dental floss, and other non-flushable items. When hot cooking grease enters the sewer system, it cools and solidifies, creating a sticky coating on pipe walls. This greasy layer then catches passing debris like a underground flypaper, gradually building into a solid mass that can completely block sewage flow.

Here’s a crucial myth that needs busting: despite what some search queries suggest, fatbergs are formed by kitchen grease and commercial cooking waste, not human body fat. The term “fatberg” refers exclusively to the fats and oils we pour down our drains, not anything related to human obesity or body composition.

And yes, fatbergs absolutely smell. Workers who’ve encountered them describe an overwhelming stench combining rotting meat with raw sewage – imagine the worst bin juice you’ve ever encountered, multiplied by a thousand and left to ferment underground for months. The smell is so potent that removal crews require breathing apparatus and protective equipment. Learn more about how to deal with drain odours here.

The scale of fatbergs defies belief. The infamous Whitechapel Monster discovered in London’s Victorian sewers in 2017 weighed 130 tonnes – equivalent to 11 double-decker buses – and stretched 250 metres long. That’s longer than Tower Bridge. Another London specimen, nicknamed the “Concreteberg” for its cement-like consistency, took nine weeks to remove using high-pressure jets and manual labour.

Australian cities haven’t been spared. Melbourne Water regularly removes fatbergs from the city’s sewage system, with some masses stretching 40 metres and weighing several tonnes. Sydney Water reported removing a 500-metre fatberg from beneath Liverpool in 2019, while Queensland Urban Utilities discovered a one-tonne fatberg blocking pipes in Brisbane’s inner suburbs. Our fatbergs might not match London’s record-breakers yet, but they’re growing larger each year as more people flush inappropriate items.

For those wondering about the term “London sewer slug” – it’s simply British slang for a fatberg, reflecting the creature-like way these masses seem to grow and move through the underground tunnels.

This is the critical section where you can make a real difference. Yes, cooking oil absolutely causes fatbergs, and you’re likely contributing to the problem without realising it. Every time hot grease goes down your drain, you’re adding another layer to your suburb’s growing fatberg.

Let grease solidify in the pan after cooking. This takes just 10-15 minutes for most fats to congeal at room temperature.

Use a silicone spatula or paper towel to scrape solidified fat directly into your bin. Never pour it down the sink, even with hot water running.

Install a sink strainer to catch food scraps before they enter your pipes. These $5 devices can save thousands in plumbing repairs.

Wet wipes belong in the bin, never the toilet – this includes “flushable” wipes, which don’t break down quickly enough to prevent blockages. Australian water authorities unanimously agree: there’s no such thing as a truly flushable wipe.

Check your kitchen sink right now. Do you have a strainer installed? If not, add one to your shopping list immediately. While you’re at it, designate an old jar or tin as your “Grease Trap” – pour hot cooking oil into it instead of down the drain, then bin it once full.

And to answer a related question: yes, it is illegal to dump oil on the ground in Australia. This practice contaminates groundwater and violates environmental protection laws, carrying fines up to $15,000 for individuals in some states.

Fatberg removal can be tough, the process combines modern technology like CCTV cameras with old-fashioned manual labour. We first deploy high-pressure water jets delivering 3,000 PSI to break apart the mass. When jetting fails against particularly stubborn sections, we resort to pickaxes, shovels, and even chainsaws to break it up.

Sydney Water spends approximately $8 million annually clearing blockages, with fatbergs representing a significant portion. Melbourne Water reports similar costs, while smaller utilities across Australia collectively spend tens of millions each year on fatberg removal. These costs inevitably flow through to ratepayers via increased water bills.

For homeowners wondering “what dissolves hardened fat?” – avoid harsh chemical drain cleaners that can damage pipes and harm the environment. Instead, try enzymatic cleaners that use bacteria to break down organic matter, or call an emergency plumber from North East Plumbing for mechanical snaking. Prevention remains infinitely cheaper than cure.

Australia’s sewage infrastructure presents unique challenges for fatberg formation. While newer suburbs boast modern PVC piping designed to handle contemporary waste loads, older areas of Sydney and Melbourne still rely on clay and concrete pipes dating back decades. These ageing systems, with their rough surfaces and joint gaps, provide ideal conditions for fatberg formation.

When comparing international sewage systems, Australia generally ranks well with modern treatment facilities and regular maintenance programmes. However, we’re not immune to the fatberg phenomenon – our systems weren’t designed for the volume of wet wipes and cooking grease modern life produces.

Climate plays a surprising role in Australian fatberg formation. Unlike London’s consistently cold sewers that keep fat congealed year-round, Australia’s temperature fluctuations can cause fats to repeatedly solidify and liquify, creating unpredictable blockage patterns. Summer heat can temporarily soften fatbergs, causing them to shift and block different sections of pipe, while winter sees rapid solidification that can completely seal pipes overnight.

The question “how big do they get in Australia?” doesn’t have a simple answer. While we haven’t yet matched London’s record-breakers, our fatbergs are growing larger each year. Climate change, population growth, and changing consumption patterns all contribute to increasingly severe blockages that threaten to overwhelm our sewage infrastructure if we don’t change our disposal habits immediately.

The solution lies in individual action. Every drop of grease you keep out of the drain, every wet wipe you bin instead of flush, helps prevent these sewage monsters from forming beneath our streets. The choice is simple: spend two minutes properly disposing of waste now, or pay hundreds of dollars more in rates as utilities pass on the multi-million dollar removal costs. The fatberg stops with you.