Carcinogen 1,4-Dioxane / Ethylene Oxide Tested by Independent Laboratory Certified Eco-Friendly Leaping Bunny Industrial carcinogenic contaminants 1,4-dioxane and ethylene oxide are regularly found in household products. The Attitude product does not contain these by-products listed as carcinogenic to humans by the State of California Proposition 65. EcoLogo - certified products must pass a series of tests to prove their environmental leadership. CO2 neutral: We plant trees for you children. Vegan product. Septic tank safe.