Abstract: In one example, a sink cabinet drain system may include a sink cabinet, a faucet, a supply line, a custom-fit drain pan, and a gravity-drained cabinet waste line. The sink cabinet may support a sink basin. The faucet may be configured to direct water into the sink basin. The supply line may be configured to supply pressurized water to the faucet, the supply line being routed through the cabinet. The custom-fit drain pan may be disposed within the cabinet, beneath both the supply line and the sink basin. The upper surface of the drain pan may be sloped to drain to a collection orifice. A gravity-drained cabinet waste line may be configured to collect liquid from the collection orifice and deliver the liquid, via gravity, to a sewer system.