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Walnut Creek · Local Project

Underground Water Line Leak Detection - 350-Foot Water Line

In Demand Plumbing, Heating & Air located an underground leak along a 350-foot water line using controlled pressurization. By pressurizing the line, our technicians caused water to surface through the pavement, allowing us to pinpoint and mark the leak location.

Real work completed by In Demand Plumbing, Heating & Air for a local Walnut Creek property.

Project completed November 28, 2025.

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In Demand Plumbing, Heating & Air technician using acoustic leak detection equipment to locate an underground water line leak beneath a paved driveway.
Our technician pinpoints an underground water line leak after pressure testing helped reveal the problem area along a 350-foot water line.

The problem

What we found.

An underground water line approximately 350 feet long had a leak that needed to be located. With the piping buried beneath the property and paved surfaces, identifying the leak location was essential before planning excavation and repairs.

The solution

What our team did.

Our In Demand Plumbing, Heating & Air technicians performed an underground water line leak detection on a 350-foot water line. Using specialized pressure-testing equipment, our team pressurized the water line to help identify the location of the underground leak. As pressure was applied, water began surfacing through a damaged section of pavement, revealing the leak's location. Our technicians identified and marked the affected area for targeted excavation and repair planning. This process helped narrow down the location of the leak without having to excavate the entire 350-foot water line.

Project photos

See the work.

Photos from this Walnut Creek project completed by In Demand Plumbing, Heating & Air.

In Demand Plumbing, Heating & Air technician using acoustic leak detection equipment to locate an underground water line leak beneath a paved driveway.
Our technician pinpoints an underground water line leak after pressure testing helped reveal the problem area along a 350-foot water line.
Long paved residential driveway with an underground water line running toward the street.
Overview of the approximately 350-foot water line where our team performed underground leak detection.
Residential driveway with asphalt pavement extending toward a white fence and landscaped property.
A view of the long driveway where the underground water line was investigated for a leak.
Muddy water surfacing through cracked asphalt inside white markings identifying an underground water line leak.
Pressure testing forced water to the surface, revealing the underground leak location beneath the pavement.
Wide view of residential driveway with white markings showing the underground water leak location.
The leak was located and marked so the affected section of pavement could be identified for repair planning.
Close-up of underground water line leak marked with white spray paint near a roadside curb.
Our technicians marked the precise area where water surfaced through the asphalt.
Carbon dioxide cylinder with pressure regulator connected to residential water piping for underground leak testing.
Specialized pressure-testing equipment was connected to the water line to help reveal the underground leak.
Plumbing technician walking along a paved driveway with acoustic underground leak detection equipment.
Our technician surveys the driveway using acoustic listening equipment to investigate the buried water line.
Close-up of plumbing technician wearing headphones while using acoustic leak detection equipment on a driveway.
Acoustic listening equipment helps our technician investigate potential underground water leak locations.
In Demand Plumbing, Heating & Air technician operating pressure-testing equipment connected to a carbon dioxide cylinder.
Our technician prepares the pressure-testing equipment used to help locate the leak along the 350-foot water line.

Related local services

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Learn more about the plumbing and HVAC services connected with this project.

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