Ontario, CA · plumbing service
Slab Leak Repair in Ontario, CA
Slab-on-grade homes hide supply leaks under the floor. Call to be connected with an independent, licensed plumber who handles slab leak repair in Ontario; they diagnose the problem and quote the work before starting.
By calling, you agree to be connected with an independent plumbing contractor serving your area. Calls may be recorded for quality and training. The call and referral are free, and you are never obligated to hire.- Licensed local plumbers
- Free call and referral
- You approve the quote first
Common signs
- Warm floor spots
- sound of running water
- a spinning meter
Slab Leak Repair services in Ontario
- Slab Leak RepairLocating and fixing leaks in pipes under the foundation.
- Leak DetectionHidden leaks behind walls, ceilings or floors, or a bill that suddenly jumps.
- RepipingReplacing old galvanized, polybutylene or failing copper lines.
- Water Line RepairLeaks and breaks in the main line from the meter.
Problems slab leak repair fixes
- A warm spot on the floor
- The water meter moving with every fixture off
- The sound of running water with nothing on
- A water bill that jumped without explanation
Why slab leak repair comes up in Ontario
Slab-on-grade homes hide supply leaks under the floor.
The typical Ontario home was built around 1981 (1978–1995 era housing), when supply lines were usually copper or CPVC supply. That material and its age shape both where leaks appear and whether a spot repair or a reroute makes more sense.
- Typical home built
- 1981
- Homes before 1980
- 48%
- Winter freezes
- Rare
How the work is done
- 1Confirm a leakA meter test and pressure test confirm water is escaping.
- 2Locate itAcoustic and thermal tools pinpoint the leak under the slab.
- 3Choose the repairDirect access through the floor, rerouting the line overhead, or repiping.
- 4Test and restorePressure-test the repair before the floor is closed.
What affects the price
The plumbing company sets the price after seeing the job; ask for it in writing before work starts.
- Leak location and depth
- Spot repair versus reroute or repipe
- Flooring removal and restoration
- Pipe material
- Permit requirements
Slab Leak Repair in Ontario: questions
A high water bill in Ontario, CA makes me suspect a slab leak; who do I contact?
Ontario Municipal Utilities takes billing questions at (909) 395-2050 and leak reports at (909) 395-2678. If the leak is under your slab, a plumber with leak detection equipment locates and repairs it.
Why is slab leak repair a common call in Ontario?
Slab-on-grade homes hide supply leaks under the floor.
How old are most homes in Ontario?
The median home in Ontario was built in 1981, and 48% of homes were built before 1980 (U.S. Census Bureau, American Community Survey).
How do I know if my Ontario home has a slab leak?
Warm spots on the floor, the sound of running water with everything off and a meter that keeps moving are the usual signs; a plumber can pinpoint it before opening the floor. In Ontario: slab-on-grade homes hide supply leaks under the floor.
Who supplies water in Ontario?
City of Ontario. Past the meter, plumbing is the owner's.
Slab Leak Repair near Ontario
- Slab Leak Repair in Rancho Cucamonga, CASlab Leak Repair in Rancho Cucamonga, CA: pinhole leaks in copper under slabs show up as warm floors or high bills.
- Slab Leak Repair in Riverside, CASlab Leak Repair in Riverside, CA: slab-on-grade homes hide supply line leaks.
- Slab Leak Repair in Corona, CASlab Leak Repair in Corona, CA: slab subdivisions develop under-floor leaks as copper ages.
More plumbing services in Ontario
- Water Heater Replacement in Ontario, CAWater Heater Replacement in Ontario, CA: scale and Inland Empire heat shorten the life of garage water heaters.
- Water Softener Installation in Ontario, CAWater Softener Installation in Ontario, CA: chino Basin groundwater is hard and leaves scale on fixtures and in heaters.
- Emergency Plumbing in Ontario, CAPlumbing emergency in Ontario, CA? Who to call (City of Ontario or a plumber), what to shut off first, and the emergencies most likely in Ontario homes.
- All plumbing services in OntarioEvery plumbing service available to Ontario homes.
Local rules and details for Ontario
Ontario facts behind this page
- The median home in Ontario was built in 1981. [1]
- About 48% of Ontario's housing units were built before 1980, the era of galvanized steel supply pipe, cast iron drains and clay sewer laterals. [1]
- Ontario's primary water source is groundwater from the Chino Basin, pumped from 17 active city wells, supplemented by desalted groundwater from the Chino Basin Desalter Authority, imported water from the Water Facilities Authority and recycled water. [2]
- Ontario Municipal Utilities Company directs residents to call (909) 395-2678 to report water leaks, open or leaking fire hydrants and missing sewer or drain covers, Monday through Thursday 7:30 a.m. to 5:30 p.m. and Friday 7:30 a.m. to 4:30 p.m. Customer service, billing and account inquiries go to (909) 395-2050, and after-hours water needs go to Ontario PD Dispatch at (909) 986-6711. [3]
Ontario rules and programs for slab leak repair
- Ontario Municipal Utilities Company directs residents to call (909) 395-2678 to report water leaks, open or leaking fire hydrants and missing sewer or drain covers, Monday through Thursday 7:30 a.m. to 5:30 p.m. and Friday 7:30 a.m. to 4:30 p.m. Customer service, billing and account inquiries go to (909) 395-2050, and after-hours water needs go to Ontario PD Dispatch at (909) 986-6711. [3]
Other common plumbing calls in Ontario
- Water Softener Installation: chino Basin groundwater is hard and leaves scale on fixtures and in heaters.
- Water Heater Replacement: scale and Inland Empire heat shorten the life of garage water heaters.
Sources (3)
- U.S. Census Bureau, ACS 2024 1-year (B25035) · checked 2026-10-01
- City of Ontario, Water Supply Assessment (Subarea 29) · checked 2026-10-05
- City of Ontario, Contact Municipal Utilities Company · checked 2026-10-20