Water main A major underground pipe that distributes municipal drinking water from the city's water system directly into local properties.
These high-pressure pipes run beneath NYC streets and sidewalks, feeding water lines into individual residential and commercial buildings. When performing sidewalk repairs, contractors must locate the water service connection, which is typically marked in blue paint during a utility survey. If a water main or service pipe is damaged during construction, it can cause immediate localized flooding, wash away the soil subbase under the sidewalk, and lead to rapid pavement collapse. Property owners are responsible for the water service line extending from the street main all the way into their building.
Frequently Asked Questions About Water main
What is a water main?
A major underground pipe distributing municipal drinking water beneath streets, feeding service lines into individual buildings.
How is it identified during sidewalk work?
Water infrastructure is marked in blue during utility markout.
What happens if a water line is damaged?
Localized flooding, washout of the soil supporting the sidewalk, and potentially rapid pavement collapse.
Who owns the service line to my building?
The property owner is generally responsible for the water service line from the street main into the building. Confirm the boundary with DEP for your property.