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Why You Shouldn't Pour Used Oil Down The Sink

TJM Plumbing • June 18, 2024

Disposing of used cooking oil in the sink might seem like a convenient solution after preparing a meal, but it can lead to significant problems. Many homeowners are unaware of the hidden dangers associated with this practice. In this blog, we'll help you understand why you should avoid pouring used oil down the drain.

Analysing The Hidden Threats

Pouring used oil down the sink is one of the leading causes of clogs and blockages in plumbing systems. When oil cools, it solidifies, creating a sticky, glue-like substance that adheres to the insides of your pipes. Over time, this build-up can restrict water flow and cause severe blockages.


Moreover, once the oil solidifies and catches other debris, it exacerbates the problem, leading to a major clog that can affect your entire plumbing system. These blockages aren't just inconvenient; they can lead to expensive repairs and potentially hazardous sewage back-ups in your home.


Another critical aspect to consider is that these clogs can cause significant damage to your home's plumbing fixtures, such as sinks and drains. When blockages become severe, they can lead to overflows and water damage, resulting in additional repair costs and potential mould growth in your home.

Consequences Beyond Your Home

Improper oil disposal doesn't just damage your plumbing system; it also harms the environment in several significant ways:


  • Water Pollution: When oil enters the sewer system, it eventually makes its way to waterways.
  • Harm to Wildlife: Oil pollution is detrimental to aquatic life, affecting fish and other wildlife.
  • Soil Contamination: Oil that seeps into the ground can contaminate the soil, making it less fertile.

Long-Term Expenses

The damage from pouring oil down the sink extends beyond clogs and blockages. Over time, the build-up of oil can corrode pipes, leading to leaks and potential pipe bursts. This corrosion is particularly problematic in older plumbing systems, which may already be susceptible to wear and tear.


Furthermore, oil build-up can cause issues with broader sewer systems. Fatbergs—large masses of solidified fat, oil and grease—can form, blocking entire sewer lines and leading to significant infrastructure damage.


Additionally, the costs associated with repairing or replacing damaged pipes can be substantial. In severe cases, the entire plumbing system may need to be overhauled, leading to disruptions and higher expenses. Regular maintenance and avoiding improper oil disposal can help extend the life of your plumbing system and prevent these long-term financial burdens.

Proper Disposal Methods

To avoid the negative consequences of pouring oil down the sink, it's essential to dispose of it properly. Here are some recommended steps:


  • Cool and Contain: Allow the used oil to cool completely. Before disposal, pour it into a sealable, non-recyclable container, such as a milk carton or an empty jar.
  • Absorb and Dispose: For small amounts of oil, soak it up with paper towels, then dispose of it in the bin.
  • Special Collection Services: Some local councils and waste management companies may offer collection services for used oil. Contact your local authority to find out if this service is available in your area.
  • Commercial Disposal Services: For larger quantities, consider hiring a waste disposal service that handles used cooking oil.


By following these proper disposal methods, you can protect your plumbing system and the environment.

Make a Positive Impact with Proper Disposal

If you've been pouring oil down your sink, now is the time to stop. At TJM Plumbing, our plumbers can help address any plumbing issues caused by oil build-up and provide advice on proper disposal methods. Don't let a simple mistake lead to costly repairs and environmental damage. Reach out to us if you need a reliable plumber for a clogged sink.

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