A plumbing emergency rarely gives you time to think. Water is spreading across the floor, a pipe just let go behind the wall, or you’ve caught a whiff of gas near the water heater, and your first instinct is to call for help. That instinct is correct. But what you do in the ten or twenty minutes before a plumber arrives can be the difference between a simple repair and a much bigger, more expensive one.

This guide walks through exactly what to do — and what not to do — while you wait, organized by the type of emergency you’re facing. If you’re reading this because something is actively happening in your home right now, start with the water shutoff section below, then come back for the rest once things are under control.

How to Know If You Actually Have a Plumbing Emergency

Not every plumbing problem needs an after-hours call. A dripping faucet can wait until morning. A toilet that runs a little long after flushing isn’t urgent. But a few situations genuinely can’t wait, because every extra minute makes the damage worse:

• Water actively spraying, pooling, or running that you can’t stop
• A pipe that has visibly burst or cracked
• Sewage backing up into a sink, tub, or floor drain
• A strong gas smell near a line or appliance
• No hot water at all, especially if it happened suddenly
• A toilet that won’t stop overflowing

If your situation matches one of these, treat it as urgent and call a plumber right away. If it’s a slow drain, a minor drip, or something that’s been the same for weeks, it can almost always wait for a scheduled visit.

Step 1: Shut Off Your Water

For almost any active leak or burst pipe, shutting off the water is the single most useful thing you can do. It doesn’t fix the problem, but it stops it from getting worse while you wait.

Finding Your Main Water Shutoff Valve

Every home has a main shutoff valve that controls all the water coming into the house. In most Houston-area homes, you’ll find it in one of these spots:

• Near the street, inside a small box in the ground close to the curb (this is usually the city’s meter valve)
• Where the main water line enters the house, often in a garage, utility closet, or exterior wall
• Near the water heater, if your home routes the main line through that area first

Take five minutes today, before anything goes wrong, to find yours and confirm it turns. A shutoff valve that’s rusted shut is a problem you want to discover on a calm afternoon, not during an active leak. If your main valve won’t budge, note that now so you can tell your plumber — it might need to be replaced as part of the repair.

To shut it off, turn the valve clockwise (righty-tighty) until it stops. Round wheel-style valves usually take several full turns. Lever-style ball valves only need a quarter turn, from parallel with the pipe to perpendicular.

Shutting Off Water to a Single Fixture

If the problem is isolated to one fixture — a toilet, a sink, a washing machine — you may not need to shut off water to the whole house. Most fixtures have their own small shutoff valve nearby:

• Toilets: a small oval or round valve on the wall or floor behind the toilet, on the supply line
• Sinks: usually two valves under the cabinet, one for hot and one for cold
• Washing machines: two valves, typically on the wall behind the machine

Turning off the fixture’s own valve is often faster than finding the main shutoff, and it means the rest of your home keeps running water normally while you wait.

What to Do for a Burst or Leaking Pipe

A burst pipe is one of the most damaging plumbing emergencies, because water can spread fast and reach places you can’t easily see, like inside walls or under flooring.

1. Shut off the water at the main valve if the leak is significant or you’re not sure where it’s coming from.
2. Turn off electricity to the affected area if water is anywhere near outlets, switches, or fixtures, and it’s safe to reach the breaker without stepping through water.
3. Move anything valuable away from the area — furniture, electronics, boxes stored nearby.
4. Start containing the water with towels, a bucket, or a wet vacuum if you have one, just to limit how far it spreads.
5. Take a few photos of the damage before you start cleanup. If you end up needing this for an insurance claim later, having timestamped photos from the moment you found it makes the process much smoother.

Once the water is off and contained, the urgency drops. You don’t need to do anything more advanced than this — cutting into a wall or attempting a repair yourself usually turns one problem into two.

What to Do If You Smell Gas

This is different from every other item on this list, and it deserves its own approach. If you smell gas anywhere in or around your home, safety comes first, before anything else.

• Leave the home immediately. Don’t stop to open windows or investigate the source.
• Don’t flip any light switches, use your phone, or operate anything electrical while you’re still inside. A spark near a gas leak is a real risk.
• Once you’re safely outside and away from the house, call for help from a safe distance.
• Don’t go back inside until you’ve been told it’s safe to do so.

A qualified plumber can evaluate and repair the plumbing-side gas piping once the immediate safety concern has been addressed. This is one situation where we’d rather you leave everything else to the professionals — including us.

What to Do for a Clogged or Overflowing Toilet

An overflowing toilet feels urgent because it is happening right in front of you, but it’s rarely as damaging as a burst pipe if you act quickly.

1. Turn off the water at the toilet’s own shutoff valve first — this is faster than the main valve and stops the overflow immediately.
2. If you can’t find the shutoff or it won’t turn, take the lid off the tank and lift the float ball or cup so the tank stops refilling.
3. Don’t keep flushing. Each flush adds more water to an already full bowl.
4. Mop up standing water as soon as the overflow stops, since toilet water can carry bacteria even before an actual backup occurs.

A single clogged toilet is usually not something that needs an emergency visit once the water is off. If multiple drains in the house are backing up at the same time, that’s a different situation — see the next section.

What to Do for a Sewage Backup

If water or waste is backing up into more than one fixture — a toilet, a tub, and a floor drain, for example — this often points to a blockage deeper in the sewer line, not just one clogged fixture.

• Avoid using any water in the house — sinks, toilets, showers, the washing machine — until the plumber arrives. Adding more water can make the backup worse.
• Keep people and pets away from the affected area. Sewage backups carry real health risks.
• Don’t attempt to clear it yourself with a plunger or drain cleaner. If the blockage is in the main line, this won’t help, and it delays a proper diagnosis.
• Ventilate the area if you can by opening a window, without walking through standing water to do it.

This is a good candidate for a sewer camera inspection once a technician arrives, since it lets us see exactly what’s causing the backup — root intrusion, a collapsed section, a blockage — before recommending a fix.

What to Do If You Have No Hot Water

Losing hot water suddenly is inconvenient, but it’s rarely dangerous the way a leak or gas smell is. Still, a few checks before you call can save time:

• Check the pilot light if you have a gas water heater with a visible pilot — sometimes it’s simply gone out.
• Check your breaker panel if you have an electric water heater, in case a breaker tripped.
• Look for water pooling around the base of the tank. If you see any, that changes things — a leaking tank is a real problem, not just an inconvenience, and it’s worth treating with more urgency.

If there’s no visible leak, a total loss of hot water can usually be scheduled the same day rather than treated as a middle-of-the-night emergency. If you do see water at the base of the unit, shut off the water supply to the heater if you can access the valve, and treat it the same way you would a leak.

What to Do for Frozen Pipes

Freezing temperatures are less common in the Houston area than in colder climates, but they do happen, and homes here are often less prepared for it than homes further north.

• Shut off the main water valve if you suspect a pipe has already frozen and cracked — you want the water off before it thaws and starts leaking.
• Open a nearby faucet slightly to relieve pressure in the line, if the pipe hasn’t burst yet.
• Never use an open flame — a torch, candle, or anything similar — to try to thaw a pipe yourself. This is a common cause of house fires during freeze events.
• A hair dryer on a low setting, held a safe distance away, is a reasonably safe way to gently warm an exposed section of pipe if you can see where it’s frozen.

If a pipe has already split, treat it exactly like the burst pipe section above: water off, area contained, photos taken.

While You Wait: Protecting Your Home

Once you’ve handled the immediate step — water off, gas situation resolved, area contained — there are a few more things worth doing before help arrives:

• Clear a path to the affected area so a technician can get to it quickly without navigating around furniture or stored items.
• Keep pets and kids away from the area, especially if there’s standing water or exposed pipework.
• Have your address and a description ready when you call, along with anything you’ve already done (shut off the main valve, turned off a breaker) so the person dispatching a technician has the full picture.
• If you’re not going to be home, let us know how someone can get inside, or plan to meet the technician there.

What NOT to Do During a Plumbing Emergency

A few instincts that feel productive can actually make things harder to fix:

• Don’t pour chemical drain cleaner into a backed-up drain. It rarely works on a serious blockage, and it makes the line harder and less safe for a technician to work on afterward.
• Don’t cut into drywall or flooring trying to find a leak yourself. This is exactly what a professional leak detection visit is for, and doing it yourself usually creates repair work that didn’t need to happen.
• Don’t ignore a small leak because it seems minor. A slow leak behind a wall can cause real damage well before it becomes visible.
• Don’t wait to see if it gets better on its own. Plumbing problems very rarely improve without intervention.

Build a Simple Plumbing Emergency Kit

Most of this guide assumes you can act quickly, which is a lot easier if you’ve got a few basics on hand before anything goes wrong. Keep these together somewhere easy to grab:

• A flashlight (many emergencies happen at night, or the breaker gets shut off)
• A few old towels or a small wet vacuum
• A bucket
• An adjustable wrench, in case a shutoff valve needs a little extra help
• This page bookmarked, or our number saved: (832) 466-6262

Frequently Asked Questions

How do I know if I need an emergency plumber or if it can wait?

If water is actively running and you can’t stop it, if multiple drains are backing up at once, or if you smell gas, treat it as an emergency. A single slow drain, a minor drip, or a toilet that’s been running a little long can usually wait for scheduled service.

Is it safe to turn off my own water main?

Yes. Every homeowner should know where their main shutoff valve is and be comfortable turning it, whether or not there’s an emergency happening. If yours is difficult to turn or you’re not sure it’s working, mention that to your plumber so it can be addressed.

Should I try to fix a leak myself before the plumber arrives?

For a genuine leak or burst pipe, the most useful thing you can do is shut off the water and contain what’s already out. Attempting a repair yourself, especially by cutting into a wall, usually adds a second problem for us to fix along with the original one.

What if I can’t find my main shutoff valve?

Check near where the water line enters the house, in a garage or utility area, or near the water heater. If you truly can’t locate it, call us — we can walk you through it over the phone, or get someone there quickly if the situation is serious.

We’re Ready When You Need Us

Top Notch Plumbing provides 24/7 emergency plumbing service across Spring, The Woodlands, Cypress, Humble, Katy, and the surrounding Greater Houston area. Every technician is licensed, background-checked, and backed by our 1-year workmanship guarantee.

If something is happening in your home right now, don’t wait — call or text us at (832) 466-6262 / (832) 403-4007.