Slab Leak Repair San Antonio: $630 to $4,400 + SAWS Tools

All rows are national figures; no publisher lists a San Antonio-only slab leak price. Reroute prices differ widely between publishers, so all three are shown.

Do this now: you think there is a leak under the slab

1. Turn off every faucet and appliance, then watch the water meter. SAWS's online leak detection guide walks through this check.
2. If the meter keeps moving and water is coming up through the floor, shut off the main valve.
3. Water near outlets or under appliances? Turn off power at the breaker only if you can reach it from a dry spot.
4. Photograph wet flooring, cracks and the meter reading, and call your insurer if floors or walls are damaged.
5. Do not start breaking concrete. Detection first tells the plumber exactly where to open.

Is it urgent? Signs of a slab leak

Water coming up through the floor is urgent; a high bill with no visible water is serious but can wait a day for detection. HomeAdvisor's warning signs are warm or damp floors, standing water, sudden pressure changes, high water bills and the sound of running water with every fixture off. HomeGuide adds foundation cracks and a warm spot above a hot water pipe.

Leak detection in San Antonio: what it costs and what SAWS offers

Professional leak detection costs $150 to $400 for most homeowners, with a budget of about $280, HomeAdvisor says. Fixr says plumbers use pressure tests, checks for moisture and cracks in the slab, and cameras in drain lines when needed, and that a hard leak can take over an hour to find.

Before you pay, try SAWS's free tools: its high bill page links a leak detection guide, a free WaterSmart Home Report and rebates on water flow sensor devices. SAWS says plumbing problems on private property are the owner's responsibility, so a leak under your slab is a private repair. SAWS customer service: 210-704-7297.

Why slab leaks happen, and San Antonio's hard water

HomeAdvisor lists poor installation, ground shifts and mineral corrosion as the main causes of slab leaks. SAWS water typically carries 15 to 20 grains per gallon of hardness, SAWS says. San Antonio's median home was built in 1985, the Census Bureau's 2020 to 2024 survey shows. Ask the plumber what the water lines are made of and how old they look.

Repair options: spot repair, lining or reroute

Spot repair through the slab, lining the old pipe, and rerouting a new line through walls or the attic each fit a different leak. HomeGuide prices lining at $500 to $3,500 and digging and replacing pipe at $700 to $5,000. Reroute prices vary the most: HomeAdvisor lists $600 to $4,000, HomeGuide $3,900 to $7,500 and Fixr $4,000 to $15,000 for a whole-house reroute. Ask the plumber to price both a spot repair and a reroute.

Insurance and help paying for it

HomeAdvisor says most policies cover slab leak repairs tied to a covered event, while gradual corrosion and pinhole leaks often are not covered; Fixr says that in most cases slab leaks are not covered. Call your insurer before the floor is opened, and photograph the damage. If water damaged floors or walls, see water damage restoration below.

• SAWS Plumbers to People. Emergency repair of fresh water leaks, including broken pipes, for qualifying owner-occupants with a home worth no more than $300,000 who meet Uplift income limits. Only SAWS-contracted plumbers do the work. Big leaks: 210-704-SAVE.
• City Minor Repair Loan. Up to $25,000, 0% interest and forgivable, for plumbing and other repairs in eligible owner-occupied homes in Council Districts 1 to 10. 210-207-6459.

Hiring a leak detection company in San Antonio

1. Ask how they locate the leak and whether the detection fee is credited to the repair.
2. Ask for the leak location marked on the floor before any concrete is cut.
3. Check the plumber's license on the TSBPE public search and ask for proof of insurance.
4. Get repair and reroute prices in writing.

More San Antonio pages: plumber in San Antonio, emergency plumber in San Antonio, water damage restoration in San Antonio and mold removal in San Antonio. The national slab leak repair and leak detection guides cover methods. Compare slab leak repair in Phoenix and slab leak repair in Las Vegas, or see home repair costs.