Water Main Line Repair, Replacement, and Leak Detection
Full Nelson locates and repairs leaks in residential water main lines and replaces water service lines that have deteriorated beyond repair. The water main line runs underground from the city water meter to your home’s foundation, delivering every gallon of water your household uses.
How Your Water Main Line Works
The water main line is a single pipe, typically 3/4-inch or 1-inch diameter for residential service, that connects your home to the municipal water supply. It enters the ground at the water meter near the street or property line, runs underground through your yard, and enters the house through the foundation wall or slab. Inside the house, it connects to the main shut-off valve, and from there water distributes to every fixture and appliance in the home.
Because this pipe is buried and under constant pressure, leaks can go undetected for weeks or months. The water saturates the surrounding soil quietly, often without any visible sign at the surface until the problem has progressed significantly.
Signs of a Water Main Line Leak
Water main leaks are not always obvious, but they leave clues that add up over time.
- A sudden or unexplained increase in your water bill without a change in usage
- Low water pressure throughout the house that has developed gradually
- Wet or soggy spots in the yard between the house and the water meter, especially when it has not rained
- The sound of running water when no fixtures are open
- The water meter continues to spin when every fixture and appliance in the house is turned off
- Discolored water, especially after the line has been undisturbed for several hours
- Sediment or rust particles appearing at faucets and fixtures
If you suspect a water main leak, check the meter. Turn off every water-using fixture and appliance in the house. If the meter dial continues to move, water is leaving the system somewhere between the meter and the house.
Water Main Line Leak Detection
Locating the exact point of a leak in a buried water line requires professional equipment. Full Nelson uses electronic leak detection, pressure testing, and visual inspection to pinpoint where the pipe has failed without unnecessary digging.
Once the leak location is confirmed, we determine whether a spot repair will hold or whether the condition of the pipe warrants a full replacement. A single joint failure or isolated crack in an otherwise sound pipe can often be repaired at the point of failure. Widespread corrosion, multiple leaks, or deteriorated pipe material across the full run usually means replacement is the better long-term investment.
Water Main Line Repair
Spot repairs address damage at a specific point on the line. The excavation crew exposes the damaged section, cuts out the failed portion, and splices in new pipe using appropriate fittings for the pipe material. The repair is pressure tested before backfilling to confirm the connection is sound.
Common water main line repair scenarios include:
- A joint failure where two pipe sections have separated due to ground movement
- A crack caused by freeze-thaw cycling, soil pressure, or age
- A pinhole leak from corrosion on copper or galvanized pipe
- Damage from tree root contact or nearby construction activity
Water Main Line Replacement
When the water main line has deteriorated to the point where spot repairs are no longer cost-effective, Full Nelson replaces the full line from the meter to the house. Replacement pipe options include copper and PEX (cross-linked polyethylene), selected based on local code requirements, soil conditions, and the homeowner’s preference.
Copper is durable, corrosion-resistant, and has a long track record in residential water service. PEX is flexible, resistant to freeze damage, handles soil movement well, and is generally less expensive to install. Full Nelson explains the advantages and tradeoffs of each material before work begins.
Water main replacement can use trenchless methods in some situations. Where the existing line runs in a straight path with access points at both ends, pipe bursting can pull new pipe through while breaking apart the old line. Where the line path runs under driveways, walkways, or mature landscaping, trenchless replacement preserves the surface.
Water Line Materials in Older Homes
The material of your existing water line affects how it fails and when replacement becomes necessary.
- Galvanized steel
Common in homes built before the 1960s. Corrodes from the inside, building up mineral scale that restricts flow and eventually develops leaks. Galvanized water lines in this age range are at or past their expected lifespan.
- Copper
Standard from the 1960s through the present. Long-lasting but vulnerable to pinhole leaks from aggressive water chemistry. Solder joints can fail over time.
- Polybutylene (PB)
Installed in some homes from the late 1970s through the mid-1990s. Known for premature failure due to chlorine degradation. If your home has polybutylene water lines, proactive replacement is worth discussing.
- PEX
Used in newer construction and replacements. Flexible, corrosion-resistant, and freeze-tolerant. Not suitable for outdoor above-ground installation due to UV sensitivity.
Why Full Nelson
- Family, Women, and Veteran owned since 2003
- Licensed, insured plumbers
- Electronic leak detection equipment
- Trenchless and traditional water line replacement
- Up-front pricing before work begins
- 24/7 emergency service for water line failures