A lead service line is the pipe that connects a home, apartment building, or commercial property to the public water main in the street. In older cities, some of these service lines were made from lead because it was once a commonly used plumbing material. The service line may include a city-owned or utility-owned portion and a private property portion, depending on the local water system. If the pipe contains lead, corrosion can cause lead to enter drinking water as it travels from the main into the building. Lead service lines are often underground, so property owners may not know the material without checking records, inspecting visible pipe sections, or contacting the local water provider. Identifying a lead service line is an important first step in understanding potential drinking water risks and planning replacement when needed.
Yes, lead pipes and older lead-containing plumbing materials may still be present in many older cities. Neighborhoods with historic homes, brownstones, row houses, apartment buildings, and older commercial properties are more likely to have aging plumbing infrastructure. Cities such as New York, Jersey City, Hoboken, Newark, and other older urban areas may contain service lines or interior plumbing that were installed before modern plumbing safety rules. Even when a building has been renovated, some underground pipes, solder joints, fittings, or older fixtures may remain in place. In many communities, utilities and city agencies are working to identify lead service lines and replace them over time. However, because these pipes are often buried or located within private property, identification and replacement can take time and may require coordination between utilities, property owners, and licensed plumbing professionals.
Lead can enter drinking water when water passes through plumbing materials that contain lead and those materials begin to corrode. This may include lead service lines, lead solder, older brass fixtures, faucets, valves, or connectors. The water source itself may not contain lead, but lead can be picked up as treated water travels through older pipes and plumbing before reaching the faucet. Several factors can affect how much lead enters the water, including pipe age, water chemistry, temperature, corrosion control, and how long water sits unused inside the plumbing system. Water that remains in pipes overnight or for several hours may have more contact with lead-containing materials. Testing water from the tap can help identify whether lead may be present and whether further inspection or replacement should be considered.
Older buildings may have higher lead risks because many were constructed before current plumbing regulations limited or banned lead in pipes, solder, and fixtures. Brownstones, older apartment buildings, row homes, and historic residential properties may have plumbing systems that were installed, repaired, and updated at different times. As a result, one part of a building may have newer plumbing while another section still contains older materials. Underground service lines can also remain unchanged for decades because they are difficult to see and expensive to replace. In dense urban areas, plumbing systems may be complex, with shared lines, older meters, and multiple renovation phases. These conditions can make it harder to identify every source of possible lead exposure. For this reason, older buildings often benefit from plumbing inspections, service line checks, and water testing.