Why Not the Drain
Poured down a drain, cooking oil congeals in pipes and sewer systems, combining with other waste to form massive 'fatbergs' — congealed masses of fat, oil, and grease mixed with flushable wipes and other material. Fatbergs cause catastrophic sewer blockages, sewage overflows, and millions of dollars in municipal cleanup costs. Never pour cooking oil down the drain.
Biodiesel: Where Used Oil Goes
Used cooking oil (UCO) and yellow grease are valuable feedstocks for biodiesel production. Biodiesel burns more cleanly than petroleum diesel and is produced domestically. Restaurants generate large volumes of used fryer oil that biodiesel companies collect and pay for.
Home cooks generate smaller amounts — but aggregated through collection programs, residential UCO is also processed into biodiesel.
Where to Drop Off
Many drop-off recycling centers have UCO tanks — check with your local facility. Some municipalities offer curbside collection in special containers.
Recycling programs specifically for used cooking oil include local biodiesel co-ops, some farmers markets, and community collection programs. Search 'used cooking oil recycling near me' for current options in your area.
Storing Oil Before Drop-Off
Let oil cool completely before handling. Pour into a clean, sealable container — a glass jar, the original oil container, or any food-safe plastic container works. Store in a cool, dark place. Oil can be stored for weeks to months before drop-off. Never mix oil with water or non-food materials.