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Cooking Oil Waste Fueling Fatbergs and Harming Waterways, Recycling Urged
8 Oct, 2025
Summary
- Brits pour 18 million liters of cooking oil down drains yearly
- Cooking oil clogs pipes and creates 'fatbergs' in sewers
- Recycling cooking oil can produce millions of liters of biodiesel

According to a recent report, British households are pouring around 18 million liters of cooking oil down the sink each year, with half of us admitting to this practice. However, this is causing immediate problems, as the coagulated oil leads to blockages in home plumbing and the formation of massive 'fatbergs' in the sewer system.
Beyond the household issues, this cooking oil waste is also extremely harmful to local waterways. When the oil enters the environment, it reduces oxygen levels in the water, suffocating wildlife and disrupting the entire ecosystem. Experts warn that no oil should ever be poured down the drain, as even liquid oils like olive oil will solidify and cause clogs.
Instead of throwing this valuable resource away, households are encouraged to collect their used cooking oil and recycle it. This waste oil can be turned into biofuel, with plants in the UK able to produce millions of liters per week. Recycling the 18 million liters of cooking oil currently going down the drain could create over 15 million liters of biodiesel, enough to power a car for more than 105 million miles and save 45 million kg of CO2 emissions.