Low water pressure in your kitchen faucet is caused primarily by dirt or a buildup within the faucet head itself. For instance, if your faucet is equipped with an aerator, unscrew it and check the screen for a buildup of dirt or, if your home has hard water, you may find a buildup of lime in the internal screen for the aerator. Either condition will constrict water flow and cut water pressure. Likewise, if your home has hard water, then it might be a good idea to run a long-handled brush down the faucet to clean any buildup and try to restore water pressure. New feeder lines may also help the situation.