A litter box for pets is provided having a container defined by a bottom and side walls and a germicidal ultraviolet light lamp positioned parallel to the bottom of the container and around the interior peripheral edge of the container, whereby the light from the lamp has an unobstructed path to the absorbent granular material in the container. The interior surface of the container is reflective to maximize the incident UV light treating the granular material. A motion detector may be provided to turn the lamp off and on when a pet approaches the litter box.
