How to (Properly) Dispose of Cooking Oil

What do you do with cooking oil after frying? Whether it's canola oil, olive oil, or vegetable oil, improper disposal of oil can clog pipes, pollute waterways, and even violate local waste management regulations.

In this guide, we'll outline what you shouldn't do with used cooking oil, followed by the best disposal methods for both household and business use.

What NOT To Do With Used Cooking Oil

Never Pour Cooking Oil Down Drains or Toilets

All types of oil, fats, and grease can cause severe plumbing problems when poured down the drain. Cooking oil solidifies as it cools, blocking pipes and contributing to the formation of "fatbergs" in sewer systems that lead to costly repairs. Worse, oil that reaches waterways can pollute large bodies of water, harming aquatic ecosystems and wildlife.

Avoid Adding Oil to Compost or Gardens

While small amounts of plant-based oils like canola or olive oil may break down, larger quantities of it attract pests and harm soil quality.

Note: Some areas treat cooking oil as hazardous waste, while others offer recycling or disposal programs specifically for oils and fats. Consult your local guidelines first to ensure compliance and avoid potential fines.

Once you've checked the rules for your area, consider the following safe and effective methods for disposing of cooking oil.

What To Do: Proper Ways to Dispose of Cooking Oil

Option 1. Reuse the Oil

If the oil is relatively clean after use, consider filtering it and storing it for future use. Cooking oils like canola and olive oil can often be reused once or twice, especially for frying similar foods.

Let the oil cool first, strain it through a fine sieve or cheesecloth, and store it in an airtight container in a cool, dark place to avoid getting rancid.

Option 2. Cool It Down and Let It Solidify

For small amounts of oil, the simplest method is to let it cool completely and wait until it solidifies. Here's how:

1. Allow the oil to cool after use.
2. Let it harden naturally in the pan. Tip: Add baking soda to turn the oil into a paste that makes it easier to scrape off.
3. Transfer it into a non-recyclable container.
4. Discard the solidified oil in the designated trash bin based on your local regulations.

In Toronto, small amounts of cooking oil can go in the Green Bin.

Option 3. Mix with Absorbent Materials

For larger quantities, you can mix the oil with absorbent materials like cat litter, coffee grounds, or paper towels. Place it in a sealed bag or container before discarding it in the trash.

Option 4. Take It to a Recycling Program

Many municipalities in Canada and the US offer recycling programs for used cooking oil. The oil is often converted into biodiesel, which serves as a renewable alternative to fossil fuels.

These recycling programs often have drop-off points or scheduled pickups. Visit your city or town’s website for specific details.

Option 5. Use Professional Disposal Services

Restaurants, catering businesses, and other food service establishments that generate large quantities of used oil should consider disposal services.

These specialized companies collect and process the oil responsibly in compliance with laws and environmental regulations. Proper storage and regular pickups can save businesses time and effort in the long term.

Conclusion

Properly managing used cooking oil isn't just about keeping your kitchen clean—it's also essential for food safety and compliance. For service businesses and food manufacturers, adhering to local regulations is critical to avoid penalties and ensure smooth operations. 

At Distributions Katrina, we understand the unique needs of B2B clients when it comes to managing bulk cooking oil, whether that's supply, storage, or disposal.