Symptoms of lead poisoning in adults: >High blood pressure >Joint and muscle pain >Difficulties with memory or concentration >Headache >Abdominal pain >Mood disorders >Reduced sperm count and abnormal sperm >Miscarriage, stillbirth or premature birth in pregnant women Unless you're "lucky" enough to live in Flint Michigan, your drinking water supply chemistry is likely fairly stable. As the letter notes, most lead material is in the service lines. If your water supply is neutral to basic, lime scale tends to build up and coat the pipe. This in turn minimizes the dissolution of lead into the water. However an acidic water supply can dissolve lead. Two things to do: 1. View your city's public works webpage to find which water treatment plant is closest to your home. Find the water quality report and read it to find out what the pH of their treated water is. 2. Inspect where your service line enters the house to determine line composition. If not viewable, ask your neighbors. If they're clueless, ask a local plumber what his guess is based on age of the neighborhood and what he's encountered. In my experience, homes in the Midwest constructed before 1920 typically have lead services. Use dropped off thereafter, with a nearly complete switch to copper by 1950. If your lines aren't made of lead, you may still be crazy though...