Is it safe to compost human feces? We look at the science. While many of the nutrients we eat are released in a convenient liquid form (which is why diluted urine is great for immediate use in the garden or compost pile), the residual bulk and nutrients are delivered in a somewhat more problematic form: poop. Why problematic? Well, it's heavy, bulky, and smelly, but, most importantly, in its raw form, poop is significantly more likely to contain microorganisms that can make us sick than urine is. But this doesn't mean you should flush your poop away, adding to the waste stream. Just like any manure, when properly handled, that black gold is fantastic for soil and plants. The keys to closing your personal nutrient loop—keeping poop out of the waste stream and returning the resources to your soil—include careful handling and composting, along with lots of time. Should You Compost Your Poop?