Burst Pipe in Your Home: What To Do in the First Ten Minutes

Published by Water Damage Restoration Specialists of San Antonio · Last updated 2026-07-25

A failed supply line does not trickle. It delivers water continuously at mains pressure — several gallons a minute, indefinitely, until somebody shuts it off. What you do in the first ten minutes determines almost everything about what follows.

The order that matters

Shut off the waterNot the fixture — the main. In most San Antonio slab homes it is in a rectangular meter box near the curb and needs a meter key or long-handled pliers. Many houses also have an isolation valve where the supply enters, often near an exterior hose bib. Turn clockwise.
Cut the power if water is near electricsAt the breaker, for the affected circuits. Never stand in water to reach a panel. If you cannot do it safely and dry, leave it and tell us when we arrive.
Open the lowest faucets in the houseThis drains the remaining water in the system downward rather than through the break.
Photograph everything before you move anythingWide shots, close-ups, the source if visible, water lines on walls. This is the record your claim rests on.
Lift and protectGet belongings off the floor. Put foil or timber blocks under furniture legs so stain does not transfer into carpet.
Call for professional extractionAnd when a crew arrives, ask who they are and what they are qualified to do before they start.

Find your shut-off valve before you need it. The single most common reason a small burst becomes a large one is that nobody could find the valve, or it was seized solid. Locate it this week, make sure it actually turns, and keep a meter key with it. Make sure everyone in the household knows where it is.

What not to do

Do not use a household vacuum on standing water — it is an electrocution risk and it will destroy the vacuum
Do not run the HVAC system if there is any chance of contamination; it distributes it through the whole property
Do not start cutting drywall or pulling carpet before it is documented
Do not assume the visible wet area is the extent — water travels along framing and surfaces a long way from where it entered
Do not delay because it is late or a holiday — the damage does not observe business hours and neither do we
Do not let anyone start work before you have asked who they are and what they are qualified to do

Why San Antonio pipes burst

Three distinct causes, depending where you are. In the pre-war housing of the near north, west and east sides, original galvanized supply lines corrode from the inside until the wall thins and splits — these are 70 to 100 years old now. In mid-century slab housing across the south and west, expansive clay movement stresses and cracks lines cast beneath the foundation. And in new far-west subdivisions, it is fittings and connections rather than pipe itself: PEX joints, appliance hoses and water heater connections.

Freezes matter too. San Antonio does not freeze often, but when it does, it catches a housing stock built with very little pipe insulation — and the damage is concentrated in exposed lines, attics, garages and outbuildings.

After the water stops

Extraction is only the first step. Water that reached wall cavities, subfloor or insulation needs documented structural drying, because surfaces dry long before cavities do — and a cavity that stays wet grows mold within days. Ask for daily moisture readings, and do not let anyone rebuild over a structure that has not been verified dry.

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Need help with this?

We provide water damage restoration, mold remediation and fire damage restoration across all 58 San Antonio ZIP codes, 24 hours a day. Call (844) 476-1017.

Ask to see credentials — from us or anyone else

Before any technician starts work on your property, you are entitled to ask them who they are and what qualifications they hold, and to ask to see documentation. That applies to us and to every other contractor who knocks on your door. Ask at your own discretion, take your time, and do not feel awkward about it — a crew that is happy to be asked is the kind you want in your house. If anyone refuses or rushes you past the question, treat that as your answer.