The Line Between the Meter and the House
Your water service line runs from the city's meter pit to your foundation, buried below frost depth, and everything about it is the property owner's responsibility. The city's very soft supply arrives through it under municipal pressure around the clock, which means a service line failure leaks around the clock too. Boulder's mix makes these lines interesting. East Boulder's post-war streets carry galvanized services from the 1950s that are simply timing out. Older blocks still hide the occasional original line, and newer builds run copper or poly that mostly fails at fittings and rocks.
Confirming It Is the Yard, Not the House
The first test costs nothing and takes ten minutes. Close the main shutoff where the line enters the house, then watch the meter. If the register still moves with the house isolated, the leak lives in the buried run between meter and foundation. If it stops, the problem is indoors and the search changes entirely. We walk callers through this on the phone constantly, because it prevents digging in the wrong place and it tells us which crew and gear to send.
Finding a Break Under Two Feet of Soil
Buried pressurized leaks are loud to the right equipment. Acoustic ground microphones listen along the line's path and peak over the escape point. Line locators trace the exact route first, since as-built drawings and reality diverge in older yards. On quiet failures, or lines under driveways and walks, tracer gas rises through soil and concrete and marks the spot. The deliverable is a flag in the lawn within a foot or two of the break, which is the difference between a small hole and an excavation.
Depth matters here. Service lines in Boulder sit below the frost line, so a winter break keeps leaking invisibly under snow, surfacing only as a bill spike or a wet meter pit. Cold-season detection works fine; it is cold-season ignoring that costs money.
Repair, Burst-Through, or Full Replacement
A located break in an otherwise sound line gets a spot excavation and repair at the flag. A line that has failed before, or galvanized past its era, is a replacement candidate. Trenchless burst-through methods can pull new pipe along the old path with just two pits, sparing lawns, gardens, and flatwork. Where the route crosses other utilities we locate everything first and coordinate the dig properly. Related buried systems get checked while we are listening. An underground leak on the irrigation side sits in the same soil and fools the same symptoms, and a failed yard line off the main can mimic a service break exactly.
Trees, Rocks, and the Enemies of Buried Lines
Service lines fail for reasons you can sometimes see from the porch. Mature trees, especially the silver maples and cottonwoods of older Boulder streets, send roots along the moist trench line and can shift or crush pipe over decades. Rocky backfill, common near the creek corridors, leaves stones bearing against the pipe wall that wear through with pressure pulses. Clay movement loads rigid joints season after season. And past repairs done cheaply, a splice of mismatched material, a fitting without proper bedding, become the next failure point. When we replace a section, the surrounding conditions get corrected too, because pipe fails where its environment tells it to.
Act on the math, too. A service line losing one gallon a minute wastes over 1,400 gallons a day, billed at your rate, every day it waits. The repair price does not change with delay. The water bill does. That is the whole argument for calling the week you notice, not the month.
If your meter is moving with the house valved off in East Boulder or anywhere in the city, call (303) 552-3896. Every day a service line leaks, you are buying water the lawn drinks.