Kitchen base cabinets house a high concentration of pressurized water connections: faucet supply lines, pull-down spray hoses, garbage disposal gaskets, dishwasher drain loops, and reverse osmosis (RO) filtration systems.
Common Sources of Slow Cabinet Leaks
- Undermount Sink Rim Gasket Failure: Heavy cast iron sinks can sag slightly from granite countertops, allowing water splashed on the counter to seep down cabinet backs.
- Pull-Out Spray Hose Rubbing: Every time you pull out the spray wand, the braided hose rubs against cabinet piping until friction causes a pinhole leak.
- Reverse Osmosis Plastic Tubing Splits: Thin 1/4-inch plastic poly lines can crack when jammed against cleaning supplies.
Inspect under sinks monthly with a flashlight for warped particleboard.