What Is a Water Main?
A water main is a buried pipe that carries treated water through a public or shared distribution system. It supplies smaller service lines that deliver water to homes, buildings, and other properties. A water main usually runs beneath a street, easement, or shared access area and connects to multiple properties.
Quick Facts About Water Main
Category
Water distribution pipe
Used for
Supplying connected properties
Common confusion
Water service line
Also called
Main Water Line
Often discussed with
Water Line Replacement
Key Takeaways About Water Main
- A water main serves multiple properties.
- A service line connects a property to the main.
- A water main isn't the same as a household supply pipe.
How Water Main Works
A water main carries treated water under pressure through a shared underground network. Branch connections lead from the main to individual water service lines. Each service line carries water to one property, where a shutoff and meter may control the supply.
Related glossary terms: Water Service Line, Water Pressure Gauge, Shutoff Valve.
Water mains can be made from materials such as PVC pipe, ductile iron, or other approved piping. Their size and route depend on the area they serve. A break can release water into soil, pavement, or nearby spaces. Repair work may involve locating the damaged section, isolating the flow, and replacing the affected pipe.
Water main replacement focuses on the shared supply pipe or the section that serves a property. A private service line may also need work if the damage continues between the main and the building.
Expert Note
When we assess a water main issue, we trace the supply path from the connection toward the building. We check visible shutoffs, exposed piping, and signs of soil movement or water loss. For water line replacement, our team separates main-related damage from problems in the private service line.
Water Main in Practice: A Real-World Example
A home may lose water after a buried water main develops a break near the street. A water line replacement project can address the damaged section and restore the connection serving the property.
Related Services
Related Terms
Water Service Line
Water Service Line is a buried pipe that carries potable water from a public water main…
Water Pressure Gauge
A water pressure gauge is a testing tool that shows the force of water inside a…
Shutoff Valve
A Shutoff Valve is a plumbing control that stops or allows water flow through a pipe…
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