There are several actions that can be taken to reduce lead in your drinking water. EPA recommends that anytime the water in a particular faucet has not been used for six hours or longer, you should flush your cold-water pipes by running the water until it becomes as cold as it will get. (This could take as little as five to thirty seconds if there has been recent heavy water use such as showering or toilet flushing. Otherwise, it could take two minutes or longer.) The more time water has been sitting in your home's pipes, the more lead it may contain. EPA also recommends using only water from the cold-water tap for drinking, cooking, and especially for making baby formula. Hot water is likely to contain higher levels of lead. The two actions recommended above are very important to the health of your family. They will probably be effective in reducing lead levels because most of the lead in household water usually comes from the plumbing in your house, not from the local water supply.
Additional information is available at http://water.epa.gov/drink/info/lead/index.cfm.