Main Water Line Repair | Service Line Leaks & Replacement

Quick answerThe water service line is the buried pipe between the meter (or the city connection) and the main shutoff inside your house. It is usually the homeowner's responsibility, and because it is underground, problems tend to show up indirectly: a wet patch in the yard, a high bill, or low pressure everywhere.

Some older service lines are made of lead or galvanized steel. Many water utilities now maintain inventories of service line materials, which can be a helpful starting point.

What this service solves

Underground service line leaks
Low pressure throughout the house
Aging galvanized or lead service lines
Damaged lines from digging or roots

Close-up of a water meter dial — Stock photo: Kelly Sikkema / Unsplash

Common symptoms

Soggy ground or puddles between the meter and the house
Sudden low pressure everywhere
High water bills
Dirty water after any disturbance
Water meter moving with everything off

Most likely causes

Corrosion

Galvanized steel corrodes over time, and old fittings can fail.

Ground movement

Settling, freezing and expansive soils stress buried pipes.

Excavation damage

Digging for fences, irrigation or utilities can strike shallow lines.

Material

Lead and older polybutylene service lines are commonly targeted for replacement.

How the problem is diagnosed

Meter test with the house shutoff closed to isolate the service line
Acoustic leak location along the line path
Checking utility service line material records where available

Repair and replacement options

Repair and replacement options
Option	Best for	What to know
Spot repair	One located leak	Excavate at the leak and replace the damaged section.
Trenchless replacement	Full replacement under lawns, driveways or landscaping	Pulling or boring a new line with small pits at each end.
Trench replacement	Straightforward runs or when other work is happening	Traditional excavation along the line path.

What a plumber normally does

Confirm leak location
Coordinate with the utility for meter or curb-stop shutoff
Repair or replace the line
Pressure-test and restore

Emergency warning signs

Water bubbling out of the ground
Complete loss of water
Water entering a basement wall at the line entry

If you see any of these, shut off water first. See emergency plumbing steps.

What affects the cost

We don’t publish national price figures because real quotes vary too much by region, access and the condition of your system. These are the factors that move the price:

Line length and depth
Method used
Surface restoration
Permits and utility coordination
Material requirements under local code

Ask for a written quote that names the method, materials and any permit or restoration work before work begins.

DIY vs. calling a professional

Reasonable for homeowners

Meter isolation test
Asking the utility about service line material

Call a professional for

Any excavation or line replacement
Work at the meter or curb stop

Prevention and maintenance

Call 811 before digging
Keep a record of where the line runs
Replace galvanized and lead lines proactively

Water Line Repair: common questions

Who is responsible for the water line from the street to my house?

Typically the utility owns the main and meter, and the homeowner owns the service line from the meter or property line to the house. The split varies by utility, so confirm with yours.

How do I know if my water service line is leaking?

Close the main shutoff in your house, then check the meter. If it still moves, water is escaping between the meter and the house, which points to the service line.

How can I find out if I have a lead service line?

Many water utilities publish service line inventories you can search by address. You can also look at the pipe where it enters the house: lead is dull gray, soft, and shows a shiny silver color when gently scratched; a magnet does not stick to it.

Water Line Repair in specific cities

Local conditions change how this problem shows up. These city guides cover local factors in depth: