24 Hour Plumber in San Antonio? Call or Wait

By the San Antonio 24 Hour Plumber team · Updated October 2026

What to do first

1. If you smell gas, leave the house and call your gas utility from outside.
2. If water is spreading, turn off the main shutoff valve or the main service at the meter.
3. Turn off the water heater (breaker for electric, gas knob to off for gas) if the main water is off for long.
4. Stop using sinks, tubs and toilets if drains are backing up.
5. Take photos of the problem and any damage, then call to be connected with a local plumber.

When do you really need a 24 hour plumber in San Antonio?

You need a 24 hour plumber in San Antonio when the problem will keep causing damage or create a safety risk if you wait. That usually means a burst pipe, water you cannot shut off, sewage coming up through drains, no working toilet in the house, or a leaking water heater. If you can stop the water and the house is safe, many problems can wait for daytime.

People search for a 24 hour plumber because problems rarely happen at a convenient time. The useful question is not the clock. It is whether waiting will make the damage or the risk worse. Availability at any hour depends on the provider and your address, so it helps to know which problems truly cannot wait.

Which plumbing problems should not wait until morning?

Problems that should not wait are the ones that keep getting worse or put people at risk. If shutting a valve does not stop the problem, or the problem is sewage or gas, treat it as urgent.

• Burst or split pipe: water spreads fast and soaks drywall, flooring and cabinets. See the burst pipe repair page for more.
• Water you cannot shut off: a stuck or broken shutoff valve means the leak keeps running.
• Sewage backup: wastewater coming up in a tub, shower or floor drain is a health and cleanup problem. The sewer line repair page explains common causes.
• Gas smell near a water heater or gas line: leave the house and call your gas utility first.
• Leaking water heater: water from the bottom of the tank often means the tank has failed.
• Water coming through a ceiling: this can mean a leak in an attic unit or an upstairs pipe.

Which plumbing problems can safely wait?

Problems that can usually wait are slow, small and contained. If you can shut off the water to one fixture, or the problem only affects one sink or toilet, a regular appointment is often fine.

• A dripping faucet or showerhead.
• A toilet that runs or rocks, when another toilet in the house works.
• A slow drain in one sink or tub.
• Low water pressure at one fixture.
• A garbage disposal that hums but the sink still drains.

Waiting does not mean ignoring it. Small leaks can damage cabinets and floors over time, and a slow drain can turn into a full clog. Write down what you notice so you can describe it clearly when you call.

How do I stop the water while I wait?

Start with the closest valve. Most toilets and sinks have a small shutoff valve on the supply line under or behind them. Turn it clockwise until it stops. If the leak is in a wall, ceiling or main pipe, shut off the main water to the house.

Many San Antonio homes have a main shutoff valve near where the water line enters the house, often in the garage or near an outside wall. SAWS advises shutting off the main water service at the meter if you suspect a leak at home. After the water is off, open a faucet at the lowest point of the house to drain the lines, and turn off the water heater if the water will stay off for a while.

Could a hidden leak be the problem?

Yes. Some leaks are not visible. Warm spots on the floor, the sound of running water when nothing is on, a water meter that keeps moving, or damp drywall can point to a leak inside a wall or under a slab.

A hidden leak is often less urgent than a burst pipe, but it should be checked soon. The leak detection page explains how plumbers look for water behind surfaces, and the slab leak repair page covers leaks under the foundation.

What happens during the visit?

During the visit, the plumber inspects the problem, finds the cause, explains your options and gives you a written quote before any work begins. You decide what to do next. Timing depends on the provider's schedule, the parts needed and how easy the problem is to reach.

• Inspection: the leak, drain or fixture, the shutoff valves and any visible damage.
• Options: a temporary fix to stop damage now, a full repair, or both, and what each involves.
• Written quote: the scope of work in writing before anything starts.
• Permits: whether the job needs a permit and inspection where you live.

What should I ask before a plumber starts work?

Ask who the Responsible Master Plumber is, what the plumber found, and what the written quote covers. TSBPE tells consumers to get the name of a company's Responsible Master Plumber and check that the license is valid. Master Plumber license numbers begin with the letter "M."

It also helps to ask whether the repair is a temporary fix or a full repair, whether a permit is needed, and what you should watch for afterward. TSBPE does not regulate the prices plumbers charge, so get the scope in writing before work begins.

What makes plumbing emergencies different in San Antonio?

San Antonio sees long stretches of heat, a few hard freezes and hard water, and each one affects plumbing. NWS normals show San Antonio averages 14 days a year with lows at or below 32°F and about 122 days a year with highs of 90°F or above. Freezes are rare but serious. During the February 2021 winter storm, San Antonio International Airport stayed below freezing for 4 days 12 hours, and burst water pipes were among the impacts. Insurers reported 44,232 claims in Bexar County from that storm.

Hard water matters too. San Antonio Water System (SAWS) says its typical hardness ranges from 15 to 20 grains per gallon, from minerals in the Edwards and Trinity aquifers. Those minerals build up in water heaters and fixtures over time. SAWS says hard water is not a health hazard.

• SAWS advises shutting off the main water service at the meter if you suspect a leak, and notes that it cannot repair plumbing on private property.
• Homes in Boerne, New Braunfels, Schertz and other suburbs may have a different water utility, so check your own utility's guidance.

This site connects callers across the area, including Stone Oak, Alamo Heights, Leon Valley, Helotes and San Antonio. Call to be connected with a local plumber who can check availability for your address.

Related pages

• Burst Pipe Repair in San Antonio
• Leak Detection and Repair
• Sewer Line Repair
• Emergency Plumber in Stone Oak