Main water line repair

How a failing service line announces itself

A wet or unusually green patch in the yard. The classic sign, and it can be some distance from the actual break. Water follows the path of least resistance underground and surfaces wherever it can. A strip of lawn thriving in August drought is worth investigating.

Pressure that has dropped across the whole house. Not one fixture, all of them. Water escaping before it reaches the building means less arriving. A gradual decline over months suggests corrosion narrowing the bore; a sudden drop suggests a break.

The bill has jumped without explanation. A service line break loses water continuously and at pressure. Unlike a slow indoor leak, this one shows up quickly and substantially.

The meter is turning with everything off. The definitive test. Shut every fixture and appliance, then watch the low-flow indicator. Movement means water is escaping on your side of the meter, and if nothing inside is wet, the service line is the prime suspect.

Discoloured water. Rusty or brown water on first draw points at corroding galvanised pipe. Sediment appearing suddenly can mean a break drawing soil into the line.

Water at or around the meter box. Sometimes the leak is at the connection or on the utility's side. Worth reporting to them before assuming it is yours.

Who owns which part

This is the first thing to establish and it saves people a great deal of money.

In most Texas municipalities the utility owns the main under the street, the tap, and the meter itself. The property owner owns everything from the meter to the house. The service line, its fittings, and any shut-off on the house side. That means a leak in your front yard is yours, even though the pipe is under grass you did not lay near a meter you do not own.

There are variations worth checking locally. Some utilities own up to and including the curb stop. A few maintain the line to the property boundary rather than to the meter. Some offer optional service line protection plans, and some cities have assistance programmes for replacement.

The practical test: if water is pooling at or before the meter box, call the utility first. It may be theirs, and they will locate and fix it at no cost to you. If the meter is turning with the house isolated and the wet ground is between the meter and the building, it is yours.

It is also worth knowing whether your homeowner's policy carries a service line endorsement. These are inexpensive, frequently unnoticed on a declarations page, and they cover exactly this, which is worth finding out before the excavation rather than after.

Why service lines fail here

Age and material. Galvanised steel, used widely through the 1950s, corrodes from the inside until the bore is a fraction of its original diameter, then perforates. Polybutylene, common from the late 1970s into the 1990s, becomes brittle and fails at fittings. Older copper pits from the outside in aggressive soil. Each material has its own timeline and its own failure signature.

Soil movement. The recurring Texas theme. Expansive clay swelling and shrinking through the seasons applies repeated stress to a buried line, working joints loose and fatiguing pipe over years.

Soil chemistry. Some Texas soils are actively corrosive to metal pipe, attacking it from the outside. This is why two identical houses on different streets can have very different service line lifespans.

Pressure. Municipal pressure above 80 psi stresses every joint continuously. A functioning pressure regulator at the house protects the interior plumbing, but the service line upstream of it takes whatever the main delivers.

Physical damage. Landscaping, fence posts, driveway work, and tree roots. A line nicked during a project years ago can weep quietly and then let go.

Repair or replace, and how it is done

Locating first. The line is traced electronically and the leak pinpointed with ground microphones. Water travels underground before it surfaces, so digging at the wet patch is frequently digging in the wrong place. Correct location is what keeps the excavation to one hole.

Spot repair. Excavate at the located point, cut out the damaged section, replace and test. Right when the line is otherwise sound and reasonably young. A physical strike on modern pipe, for instance.

Full replacement. Right when the material is at end of life. A galvanised or polybutylene line that has failed once will fail again, and paying to excavate the same lawn repeatedly is poor value. The new line runs meter to house, usually in PEX or copper, in a single continuous length with no buried joints.

Trenchless replacement. Where the route allows, the new line can be pulled or moled through with pits at each end instead of a trench across the yard. This matters most when the run crosses a driveway, sidewalk or mature planting. The same arithmetic as trenchless sewer work.

Testing and reinstatement. The new line is pressure-tested before backfill, and disinfection is required in many jurisdictions before it returns to service. Confirm what restoration is included; backfill and compaction should be, re-sodding and concrete often are not.

When it is pressure rather than a leak

Low pressure throughout the house does not always mean a broken service line, and it is worth ruling out the cheaper explanations before anyone excavates a lawn.

A failed pressure regulator. The most common cause by a distance. These have a service life of ten to fifteen years and they fail in both directions, sometimes strangling flow, sometimes letting full main pressure through. Replacing one is a modest job at the house rather than an excavation.

A partially closed valve. The meter valve, the curb stop, or a house shut-off left partly closed after previous work. Genuinely common, and free to fix.

Corroded galvanised interior pipe. If the service line is fine but the pipe inside the house is old galvanised, the restriction is indoors. The tell is that the furthest fixtures suffer most.

A municipal supply change. Occasionally the pressure delivered to the street has genuinely changed. Neighbours experiencing the same thing is the clue.

A proper diagnosis measures static pressure at a hose bib, checks flow, tests the regulator and reads the meter with the house isolated. That sequence separates a service line problem from the three cheaper possibilities in under an hour, which is exactly why it happens before anyone starts digging.