What is lead, and how does it get into drinking water?

Lead is a common naturally occurring metallic element used for centuries in plumbing because of its pliability and resistance to leaks. Lead’s chemical symbol, Pb, is derived from the Latin word for plumbing. However, lead is a toxic metal that can cause immediate health effects at high doses and long-term health effects if it builds up in the body over many years. 

Lead is almost never present when water flows from the treatment facility or in the water mains. However, in some older homes, lead may be present in the pipe connecting the home to the water system – known as a service line -- or in the home plumbing. Lead in service pipes, plumbing, or fixtures can dissolve, or particles can break off into water and end up at the tap. 

What is a service line?

A water service line consists of two separate pipes.  One connects Bethesda Water Supply's water main to the customer’s water meter.  The other part connects the water meter to the customer’s house and/or building.  Bethesda Water Supply is responsible for the water service from the water main to the water meter. The property owner is responsible for the water service line from the water meter to the home and/or building, including all the service lines inside the home and/or building.  

Use the link to access the Bethesda Water Supply Lead Service Line Inventory.