A Larkspur slab leak is a water line leaking beneath a concrete floor. Inside town limits, the Town of Larkspur runs the water and wastewater systems, and the plumbing in and under your house is yours to repair. Call the number on this page to be connected with a local plumber in Larkspur.

What happens when you call
We connect you with an independent plumber who serves Larkspur and the East Plum Creek valley. They will ask what the meter did during a no-use test, where you have noticed warmth or dampness, and whether you are inside town limits. At the house, the plumber isolates hot from cold, pressure tests each side, and traces the leak with acoustic equipment, adding a thermal camera for hot lines. Concrete is opened only after the leak is narrowed down.
What sets the cost
- Locating. Cold-side leaks give fewer clues and take longer.
- Method. A spot repair at the leak, or a reroute through walls and ceilings.
- Finishes. Tile, wood and finished lower levels add restoration.
- Damage. Wet drywall or carpet pad may need drying.
- Permit. Inside town limits, the Town of Larkspur Building Department, not Douglas County, processes building permits, and SAFEbuilt performs inspections.
Larkspur conditions
Larkspur is a small town in the East Plum Creek valley of southern Douglas County along I-25, about 11 miles south of Castle Rock, best known as home of the summer Colorado Renaissance Festival. Homes vary in age, so the pipe under a slab could be copper, which wears where it rubs against gravel, or plastic, which tends to fail at fittings.
The Town's Public Works Department runs the water and wastewater systems within town limits under a Water and Sewer Board, with the water system operated under contract by Semocor. Water comes from three Denver Basin aquifer wells. Our fact sheet has no water chemistry for the Town, so we make no claims about it; the Town's own water quality report is the place to check. Properties in the 80118 ZIP outside town limits may have different water arrangements, and their permits go through Douglas County.
Before the plumber arrives
- Take two meter readings an hour apart with nothing running
- Find and test the main shutoff
- Clear access to the water heater and the suspect floor
- Confirm whether your address is inside town limits
- Photograph any staining or damage for your records
If the house is newer, a single failed fitting is a common finding and may be repaired in place. In an older home, ask how the rest of the buried pipe looks; worn copper usually argues for a reroute so you are not back under the same floor later.
Slab Leak Repair questions in Larkspur
Does slab leak work need a permit here?
Should I call the water utility or a plumber first?
How can I tell whether my house sits on a concrete slab?
Will homeowners insurance pay for a slab leak?
More plumbing services in Larkspur
Slab Leak Repair nearby
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