For residents in Manhattan’s historic prewar buildings, water quality is a topic that requires proactive attention. While the water delivered by the City is virtually lead-free, the reality of aging infrastructure means that internal plumbing or the “service line”—the pipe connecting your building to the main—can still pose a risk.
Understanding the Risks in Prewar Buildings
In NYC, lead service lines were legally installed until 1961, and lead solder was used in household plumbing until 1987. Because many Manhattan buildings predate these bans, they are statistically more likely to have plumbing materials that can contribute to lead levels in tap water.
Lead doesn’t affect the water’s taste, smell, or appearance, which is why it is often called a “silent” concern. Conducting certified lead testing for drinking water in Manhattan apartments provides prewar residents with precise verification of tap water purity. It typically enters the water through corrosion when water sits stagnant in pipes for long periods, such as overnight or during the workday.
How to Identify Potential Issues
If you live in a prewar building, you can take a few concrete steps to determine if your unit or building is at risk:
- Check the NYC Service Line Map: You can search your property address on the NYC Water Service Line Map to see if your building is identified as having a potential lead service line.
- The Scratch Test: If you have access to the main water shut-off valve (often in a basement or utility area), you can use a coin to gently scratch the pipe.
- Shiny/Silver: Indicates lead.
- Copper-colored: Indicates copper.
- Dull Gray/Hard: Likely galvanized steel (a magnet will stick to this).
- Request a Free Test Kit: The NYC Department of Environmental Protection provides free lead testing kits for residential drinking water. You can request one by calling 311 or filling out the online form.
Immediate Steps to Reduce Exposure
If you are concerned about your water quality, you can significantly reduce your potential exposure with these simple habits:
- Flush Your Tap: If water has been sitting in your pipes for several hours, run the cold water for 1–2 minutes (or until it feels noticeably colder) before using it for drinking, cooking, or making baby formula. This flushes out water that has been in contact with the pipes the longest.
- Use Cold Water Only: Lead dissolves more easily in hot water. Always use cold water for cooking, drinking, or preparing formula. Do not use hot tap water to speed up cooking, and never boil water to “remove” lead, as boiling does not eliminate the metal.
- Clean Your Aerator: Periodically unscrew the aerator (the mesh screen on the tip of your faucet) and clear out any sediment or particles that may have become trapped.
- Consider Filtration: If you choose to use a water filter, ensure it is NSF/ANSI Standard 53 certified for the reduction of lead. Always follow the manufacturer’s instructions for maintenance and replacement.
Property Owners and Advocacy
While tenants cannot sign up for city-funded replacement programs, property owners can. If you are a tenant, inform your landlord if you suspect lead pipes. The City occasionally offers programs to replace private service lines for eligible properties at no cost. You can learn more about these infrastructure and replacement initiatives to stay informed about what your building management should be doing.
Are you interested in learning more about the health effects of lead or how to navigate the process of testing your water?
How to Identify Your Water Service Line
This video provides a helpful visual guide on how to perform the “scratch test” and identify the material of your water service line.