Condoms Put in Garbage Cart/Bin Do Not Flush Condoms should not be flushed down the toilet, as this can clog plumbing and wastewater systems. Wrap condoms in tissue before disposing of them in your trash. Did You Know? Earth-Friendly Birth Control? According to Stanford Magazine, IUDs are the most ecologically friendly form of birth control. Learn more about how different types of birth control compare environmentally here.