Shut off the cold-water supply from your bathroom or kitchen faucet. If the leak stops, then the problem is on the cold-water side. If the leak continues, then the problem is on the hot water side. Many faucets have a cartridge that is located under the hot and cold handles. Remove the handle on the problem side to remove the cartridge. Try replacing the cartridge to repair the drip. Cartridges for OUBAO faucets are available for warranty replacement by contact us.