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What to Do If Your Water Heater Leaks

A leaking water heater is easy to miss until it is hard to ignore. The heater usually sits in a garage, a utility cupboard, or a corner of the house that nobody looks at from one month to the next, and a slow leak can soak the floor around it for weeks before anyone notices. When the leak is finally found, the floor is often wet, the water may have spread further than it looks, and the heater itself may be past the point of a simple fix.

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This guide covers what to do when your water heater leaks: shutting the water off in general terms, staying clear of electrics in standing water, what a leak may point to, and when to call a professional. The steps are the same whether the heater is gas or electric, and they start with safety, as they always do when water and electricity share a room.

Shut the water off in general terms

If you find water around your water heater, the first step is to stop more water from coming in, but only if you can do it safely from a dry place. The water heater usually has a shut-off valve on the cold water line that feeds into it, and turning that off stops the supply to the heater. If you cannot find that valve, or cannot reach it without stepping into standing water, use the main shut-off for the house instead, provided you can reach it from a dry place. If neither is safely reachable, leave both alone and call a professional.

Do not try to drain the heater yourself, and do not open any valve you do not recognise. A water heater holds hot water under pressure, and the wrong valve can release scalding water. The aim of shutting the water off is to stop the leak from getting worse while you wait for help, not to fix the heater. Once the water is off, the leak should slow or stop, and you can turn your attention to the water that is already on the floor.

Do not touch electrics in standing water

A water heater and standing water are a combination that demands care. If the heater is electric, do not touch it, its switches, or any outlet near it while the floor is wet. If the heater is gas, do not touch any electrical item in the room either, because the danger is the water and the wiring, not the fuel. If the water has reached the electrical panel or any outlet, stay out of the room entirely and call for help from outside the house.

Shut off the power only if you can do so from a dry place without stepping into water. If the switch is in the wet room, leave it. The same rule applies to the gas supply: do not attempt to work on the heater or its connections yourself. A professional will deal with the heater and the electrics as part of the visit, and your job is to stay dry and stay out of the room until then.

What to Do If Your Water Heater Leaks — California water damage restoration guide

What a leak may point to in general terms

A water heater leak can come from several places, and the location of the water gives a clue about which one. Water at the base of the heater may point to a failing tank, while water at the top may point to a connection or a valve. Water around the pipes that feed the heater may point to a fitting that has worked loose. These are general pointers only, not a diagnosis, and they do not tell you whether the heater can be repaired or needs replacing. That judgement belongs to the person who inspects it.

Age is a factor in general terms. A heater that has been in place for many years is more likely to develop a leak at the tank itself, while a newer heater is more likely to leak at a connection. Rust-coloured water, a rumbling sound, or a heater that no longer holds its temperature can all appear alongside a leak, and each is worth mentioning when you call. The leak is the problem to deal with first, but the other signs help the professional understand what the heater has been doing in the weeks before it failed.

When to call a professional

Call a professional as soon as you find water around the heater, rather than waiting to see whether it stops on its own. A leak that stops and starts is still a leak, and the water that has already soaked into the floor will not dry itself. Describe what you can see: where the water is, how much there is, whether it is hot, whether it smells of rust, and whether any electrics are wet. Mention the age of the heater if you know it, and whether it is gas or electric.

The visit will cover the water damage first and the heater second. Water damage restoration starts with an inspection of how far the water has spread, then removal and drying, and the heater itself is dealt with as part of the wider job. Homeowners in Los Angeles and across California face the same first steps, because a leaking heater behaves the same way wherever the house stands.

What to do while you wait

While you wait for help, move belongings away from the water where you can do so safely, and keep children and pets out of the room. Do not use a household vacuum on standing water, and do not switch on fans or heaters in a room where water is near outlets or wiring. If the water is spreading, a rolled towel at the doorway can slow it, but do not wade into the room to place one.

Take a photo of the heater and the water from the doorway, and note when you first noticed the leak. That record is useful for the visit and for any insurance claim. Then step back and let the emergency water removal work start with a proper inspection, rather than with guesswork about where the water has gone. The floor around a leaking heater often hides more water than it shows, and the inspection is what finds it.

Checking the heater and the pipes around it

A water heater does not sit alone. It is connected to the cold water line that feeds it, the hot water lines that leave it, and the drain or the overflow that carries water away if something goes wrong. When a heater leaks, the pipes around it deserve a look too, because a leak at a connection can look like a leak from the tank, and a leak from the tank can look like a leak from a pipe. The professional who attends will check the heater and the connections together, and will tell you what was found and what the plan is. Your job is to describe what you can see, not to diagnose it.

It is worth looking at the area around the heater every few months, on a dry day, so that a leak is found early rather than late. Look at the floor for damp, look at the pipes for signs of rust or damp, and look at the heater itself for rust-coloured water or a rumbling sound. These are general pointers only, and they do not tell you whether the heater can be repaired or needs replacing. That judgement belongs to the person who inspects it. A heater that is checked every few months is a heater whose leak is found when it is small, and a small leak is a small job.

Key Takeaways

If you find water around your water heater, the first step is to stop more water from coming in, but only if you can do it safely from a dry place.
A water heater and standing water are a combination that demands care.
A water heater leak can come from several places, and the location of the water gives a clue about which one.
Call a professional as soon as you find water around the heater, rather than waiting to see whether it stops on its own.
While you wait for help, move belongings away from the water where you can do so safely, and keep children and pets out of the room.
A water heater does not sit alone.

Your Next Step

If this guide matches what you found at home, the next step is a visit — not a guess. Call and describe what you found, and the visit is arranged from what you describe. The Water Damage Restoration page explains what that service covers, and the Water Damage Restoration page explains what that service covers, and the services hub lists every service in one place.

Do not use a household vacuum on standing water while you wait, and if water is still coming in, turn off the shut-off valve for that fixture where you can reach it safely.

Keep the guides on this site bookmarked: the first guide, the signs guide, and the preparation guide cover the checks worth repeating — after moving in, and after bringing used fixtures home.

Water damage help is available across California. See water damage restoration in Antioch, CA for one local example, or find your town on the service areas page.