B737 Undifferentiated or Other Model
Flight Crew Last 90 Days 600; Flight Crew Total 6000; Flight Crew Type 1500
Aircraft Equipment Problem Critical
General Declared Emergency
Aircraft
The aft left lavatory was leaking from the bottom of the toilet. The flight attendants turned off the water valve and it continued to leak. Then the flight attendants depleted the potable water system by turning on the other sinks and flushing the other toilets. The lavatory continued to leak and there was 2 inches of water on the aft galley floor. I was concerned the water would short out electrical systems and declared an emergency to get direct routing to [destination]. We landed without incident. I made a log book entry and the aircraft was turned over to maintenance.
B737 Captain reported flight attendants were concerned about a water leak in the left aft lavatory that resulted in several inches of standing water in the aft gallet. Flight declared an emergency to get direct routing.