How to dispose of cooking oil in Costa Rica

Cooled oil coats pipes and builds clogs; the US EPA identifies fats, oils and grease as the leading cause of nearly half of reported sewer blockages. In Costa Rica there is an extra factor: many homes outside city centers use septic tanks, and oil disrupts how they work. One liter of oil can also pollute around 1,000 liters of water by forming a film that blocks oxygen exchange, as Fundación Aquae explains.

Oil-solidifying powders, a Japanese kitchen staple for decades, turn hot used oil into a firm block you can toss with regular trash. They are hard to find in Costa Rica today; Grasigo, a plant-based solidifier made locally, is in development. Join the waitlist to hear when it launches. Meanwhile: let oil cool fully, pour it into a sealed container, and only then bin it.

The national ecolones program accepts used cooking oil at several collection points, alongside other recyclables. Store it cold in a sealed plastic bottle. Some municipal collection centers take it too; ask at your municipalidad.

Collected used oil in Costa Rica gets exported as biodiesel feedstock. Local outlet La República reported tens of thousands of liters leaving the country monthly for European biofuel plants. Your bottle genuinely ends up as fuel, not landfill.