Pipe & Drain

Common Pipe Leaks in Older NYC Homes

July 3, 2026·6 min read

A huge share of New York City's housing stock predates modern plumbing materials and code. That history is part of the charm, but it also means the plumbing tends to fail in a handful of predictable, well-understood ways.

Galvanized steel supply pipes

Common in buildings from the early-to-mid 20th century, galvanized steel pipes corrode from the inside out over decades. The corrosion narrows the interior diameter and eventually creates pinhole leaks, often first noticed as reduced water pressure before an actual leak appears.

Original cast-iron drain lines

Cast iron is durable but not permanent — most residential cast-iron drain lines have a practical lifespan of 75-100 years. Past that point, they become more prone to cracking, especially at joints, and to the interior scaling that causes recurring drain clogs.

Joint and fitting failures

Even well-maintained older systems tend to develop leaks at joints and fittings before the pipe body itself fails, since threaded and soldered connections are the weakest points in any system as materials expand, contract, and settle over the decades.

Signs worth taking seriously

A noticeable drop in water pressure, especially if it developed gradually
Discolored water, particularly a brownish tint right after the tap has been off for a while
A higher-than-usual water bill without a change in household usage
Damp spots, warping, or a musty smell near walls or floors close to pipe runs
Visible corrosion or scaling on any exposed pipe sections in a basement or utility area

Repair versus repiping

A single isolated leak is usually a straightforward repair. But if a home is seeing repeated leaks in different locations, that's often a sign the supply piping as a whole is nearing the end of its service life, and a broader repiping conversation is more cost-effective than a series of one-off repairs over the following years.

Leak detection is the right first step whenever the cause isn't obvious — it pinpoints the actual source before any wall or floor gets opened up unnecessarily.

Frequently Asked Questions

A magnet will stick to galvanized steel pipe but not to copper or plastic. A technician can also confirm pipe material during an inspection.

A slow pinhole leak isn't usually an immediate emergency, but it should be addressed quickly — the surrounding corrosion that caused it often means nearby sections are close to failing too.

Coverage varies significantly by policy and cause. We recommend checking with your insurer directly, especially for damage related to gradual corrosion versus a sudden pipe failure.