Its not often but I do come across lead main water pipes. These pipes are usually found in homes built before 1930. The tell tail sign of the lead water pipe is the bulb that is visible at the connection. Lead pipes are not threaded so they have a bulbous connection. I always recommended that lead pipes be changed out because of the health risks that are associated with lead in drinking water. Lead can cause neurological damage especially in children. If you have a lead water pipe you should replace it. The issue with replacement is that it can be very expensive. Typical replacement costs are $6,000 but can be much higher depending on complexity and distance from the home to the street water connection. At a minimum you should contact your local water authority and have your drinking water tested if you have an older home.
LookSmart is a NJ home inspector who performs new Jersey home inspections in Northern and Central New Jersey. John Martino is a NJ member of the Independent Home Inspectors of North America.