Water pooling at the bottom of your refrigerator or inside or underneath your vegetable crisper drawers is usually caused by a blocked or clogged defrost drain or tube. When your refrigerator defrost cycle runs, excess water collects in this tube and is sent through a drain and into an evaporation or condensation pan at the bottom of the refrigerator where the water naturally evaporates back into the air.
Food debris and ice can block the line, parts that are part of the line (such as valves, etc.), collection cup or the defrost drain, causing water to flow into or out of the fridge. To fix this, locate the drain on your refrigerator and flush it out using hot water applied through a turkey baster. You can also check the drainage tube for buildup of ice or other debris. You may need to remove a back panel or kick plate in order to get at this part (remember to unplug your refrigerator first). You can flush out any drainage tube parts with warm water or clean the ends with a pipe cleaner, small brush or cotton swab before reattaching the part.
Other refrigerator parts to check:
Make sure your evaporator or drain pan located underneath the refrigerator is not cracked or damaged. If it is, it might be spilling or leaking water out onto your floor. Replace the evaporator or drain pan with a new one.
Check your refrigerator’s door gasket and make sure the seal is tight and free from damage. A worn or loose gasket might be causing more warm air than normal to enter your refrigerator, causing condensation on the walls of your refrigerator which then runs down the inside of your fridge and collects at the bottom of your refrigerator.
If your refrigerator has a water or ice dispenser, check the tubing and connections to the water filter, water fill valve, icemaker inlet and dispenser inlet to make sure the connections to the tubing supply line are secure and there are no leaks. However, usually leaks only happen when the icemaker or water dispenser is being used.