Leaks, pipes & freezing · San Antonio
Leak detection in San Antonio, TX
Turn off every fixture and watch the water meter's leak indicator. If it moves, water is leaking somewhere. A plumber uses pressure tests, acoustic listening and thermal imaging to find the leak so only a small section of wall or floor has to be opened.
- Licensed local plumbers
- The problem explained before work starts
- Price agreed before the job begins
Leak detection for San Antonio homes
Hidden leaks waste water and rot framing before anyone sees them. In dry climates a slow leak can evaporate as fast as it drips, so a stain may never appear. The first sign is often a water bill that jumps between seasons that should match.
For the full guide, including what you can safely do before a plumber arrives, see leak detection explained.
Leak detection in San Antonio at a glance
- Urgency
- Usually plannable
- Area
- San Antonio, TX
- Who does the work
- An independent, licensed local plumber
- Permit
- Plumbing permits are issued by the City of San Antonio Development Services Department.
- Typical steps
- Meter and isolation test → Pinpoint → Open and repair → Document
- Availability
- Call now to check plumber availability
Signs you need leak detection in San Antonio
- A water bill higher than the same month last year
- The meter's small triangle or dial turning with everything off
- Warm spots on a floor (a hot water line leaking under a slab)
- Musty smells, bubbling paint or warped baseboards
- Constant sound of running water
Local conditions
Leak detection in San Antonio: what's different
Clay movement under San Antonio slabs breaks hot and cold supply lines. Warm spots on the floor are a common sign of a slab leak.
A plumber confirms the leak at the meter, then uses acoustic listening and thermal imaging to locate it.
Historic homes with century-old pipe in King William and Monte Vista tend to leak at old joints, while newer north-side slab homes see leaks in lines under the floor. A plumber confirms the leak at the meter and locates it before opening walls or slab. SAWS tiered rates and watering rules make leaks expensive.
- Water and sewer in San Antonio
- San Antonio Water System (SAWS) provides water and sewer service to most of the city.
- Permits in San Antonio
- Plumbing permits are issued by the City of San Antonio Development Services Department.
San Antonio housing and plumbing
Historic districts like King William and Monte Vista have century-old homes with cast-iron and galvanized pipe, while the north side is mostly newer slab construction.
Neighborhoods and ZIP codes
Plumbers on Thawline cover San Antonio and Bexar County, including Alamo Heights, Monte Vista, Stone Oak, King William, Medical Center, Southtown. ZIP codes: 78201 · 78202 · 78203 · 78204 · 78205 · 78206.
Other San Antonio conditions that affect plumbing
- Very hard water: Scale buildup shortens tank water heater life and calls for regular flushing or descaling of tankless units.
- Slab leaks: Clay movement under slabs breaks hot and cold lines; warm spots on the floor are a common sign.
- Drought watering rules: SAWS seasonal watering rules make leaking irrigation valves and backflow devices worth fixing quickly.
- Winter Storm Uri: The February 2021 freeze burst pipes across San Antonio, where homes are built for heat and plumbing often runs through attics and exterior walls. Insulating vulnerable lines is a common follow-up.
How leak detection works in San Antonio
- 1
Meter and isolation test
Fixtures are shut off one branch at a time to see which part of the system is losing water.
- 2
Pinpoint
Acoustic listening, thermal imaging and moisture meters narrow the leak to a small area.
- 3
Open and repair
Only the area over the leak is opened. Repairs are made and pressure tested.
- 4
Document
You get a written description of the cause for insurance or a future buyer.
What affects leak detection cost in San Antonio
Every job is priced by the plumber after they see it. These are the things that move the price most. Ask for the price before work starts.
- Supply leak versus drain leak
- Leak location: wall, ceiling, under a slab or in the yard
- Equipment needed to pinpoint it
- Access and patching (drywall repair is often a separate trade)
Leak detection questions in San Antonio
What causes slab leaks in San Antonio?
How do I check my meter for a leak?
Is the leak my responsibility or the water utility's?
Which homes get slab leaks?
Also in San Antonio
Related
Related plumbing services
Burst pipe repair
Turn off the main water shutoff first, then open a faucet on the lowest floor to drain the lines.
Learn more
Water line repair
The water service line runs from the curb stop near the street to your house, buried below the frost line.
Learn more
Repiping
Repiping replaces a home's water supply lines, usually because old galvanized steel has corroded or polybutylene is at risk of failing.
Learn more
Toilet repair
A toilet that runs needs a new flapper or fill valve.
Learn moreGuides
Read before you call
Emergencies
What to do when a pipe bursts
Shut off the main water valve, open the lowest faucet in the house to drain the lines, turn off the water heater, and cut power to any room where water is reaching outlets. Then call a plumber, photograph the damage, and call your insurer.
Emergencies
How to find and test your main water shutoff
Look where the water line enters the house, usually through the basement or crawl space wall facing the street, next to the water meter. Test it once a year by closing it and confirming water stops at a faucet, so you know it works before a pipe bursts.
Costs & planning
High water bill? How to find a hidden leak
Turn off every fixture and watch the meter's leak indicator for 15 minutes. If it moves, put dye in each toilet tank, check the water heater and irrigation, then call for leak detection if you still can't find it.
Need leak detection in San Antonio?
Tell us what's going on and your ZIP code. You'll be connected with a licensed plumber who serves your area.
Call now to check plumber availability