Sewer Line Location Service — Los Angeles & the Valleys
Know Exactly Where Your Sewer Line Runs Before Anyone Digs.
Electronic line locating from a licensed, family-owned LA plumber since 1997. We map the exact path and depth of your sewer lateral and mark it on the ground — so repairs are targeted and projects don’t hit it by surprise.
Book an Appointment
Book a Sewer Line Locate — Confirmed Within 1 Hour
🔒No obligation. Confirmed within one hour. Never shared.
Who needs this
Planning a project — pool, addition, ADU, foundation, landscaping, tree removal
Nobody knows where the line runs — no plans, or the plans are wrong
Facing a sewer repair — locate the defect so we dig once, in the right spot
Buying a property — pair with a camera inspection
Contractors who need the line marked before excavation
Roots suspected — find where the line passes under mature trees
Guessing is expensive. Locating is cheap.
Why LA-area lines are so often a mystery
Across LA’s older neighborhoods, sewer laterals were installed decades ago — often before the current house, the current landscaping, or the current owner. Additions get built over them, driveways get poured across them, and the city’s plans (when they exist) don’t always match what’s in the ground.
On hillside lots in La Crescenta, Tujunga, Montrose, and La Cañada, depth and grade add another variable — the line may run far deeper than anyone expects. We combine a transmitting sonde run through the line with a surface receiver to trace the exact route and depth, then mark it on the ground. That single step is what turns a destructive exploratory dig into a precise, minimal one — and it’s what lets us recommend trenchless repair with confidence.
What you get
The exact route of your lateral, marked on the surface
Sewer line path marked on the ground
The depth at key points
Know how deep the line is
Notes you can hand a contractor
Clear details for your contractor
Optional camera inspection at the same visit
See inside the sewer line
A targeted repair plan if we find a defect
Know exactly what needs fixing
Ready to locate your line?
Call (626) 956-3708 or book your sewer line locate.
How it works
Call/request online
Confirmed within one hour.
We run the sonde and trace from the surface
Then mark the path and depth.
You get the map
If there’s a problem, honest options and a written price.
Cost
Line locating is a low flat rate — and it’s usually the cheapest insurance on the entire job, because it prevents an exploratory dig in the wrong place or a contractor’s excavator finding your lateral the hard way. Often bundled with a camera inspection; ask when you call.
Why LA chooses Advantage Plumbing & Rooter
24/7 real people
Written prices up front
Licensed CA #1067555
Family-owned since 1997
Hillside/deep-line experience
Workmanship guarantee
Rated 5.0 ★ across 300+ reviews
Frequently asked questions
Map Your Sewer Line Before You Dig — Confirmed in 1 Hour
Book an Appointment
Book a Sewer Line Locate — Confirmed Within 1 Hour
🔒No obligation. Confirmed within one hour. Never shared.