A composting toilet assembly has a composting bin with an agitator, a toilet bowl, and a urine bottle. The agitator has an agitator handle configured to actuate the agitator. The agitator may have a ratchet assembly including a hub, a clutch bearing disposed in the hub, and a pair of brass bushings disposed in the hub. The toilet bowl is disposed on the composting bin. The toilet bowl has a main body with a recess. The recess may have a first portion and a second portion with a partition wall. Each of the first portion and the second portion has an opening. The urine bottle is in fluid communication with the bowl. The urine bottle is configured to receive urine. The urine bottle has a drain, a handle, and a sensor. The sensor may have a light and be configured to detect a predetermined urine level in the urine bottle.