A waste collection container has vertical walls extending up from a horizontal base and a raised floor supported on a ledge above the base to define a primary collection chamber above the raised floor and a liquid collection reservoir between the base and the raised floor. The top surface of the raised floor is sloped downwardly from the outer periphery to a central elongate grate to direct rain water and other liquid in the primary collection chamber to the grate and into the lower liquid collection chamber. When the waste collection container is inverted to dump the collected waste into a truck, water and other liquid remains trapped in the lower reservoir, thereby reducing the load weight of the truck. One or more drain holes near the base of the container allow the liquid to be drained out of the liquid collection reservoir.