It can be. The leak itself is usually not dangerous, but water near gas or electrical connections, scalding hot water and a tank that's starting to fail can all turn into real hazards. The water can also quietly soak the flooring and walls around the heater, so any leak is worth dealing with now rather than later.
Here's what makes a water heater leak risky, what a leak from the bottom usually means, and what kind of water damage to check for.
When Is a Leaking Water Heater a Safety Concern?
You smell gas. Leave the house and call your gas utility from outside. Don't flip switches on the way out.
Water is near electrical parts. On an electric heater, or near the outlets, cords or panel around a gas heater, don't touch anything electrical. Call an electrician or your electric utility first.
Water is coming from the relief valve pipe. The pipe running down the side of the tank comes from the temperature and pressure relief valve. Water there can mean the valve is releasing pressure or failing. Either way, have a plumber check it.
The water is hot. Water from the tank or relief valve can be hot enough to burn. Keep kids and pets away.
If none of those apply, the bigger risk is usually the water damage itself.
What Does a Leak From the Bottom Mean?
Water pooling under the tank, especially with rust at the base, often means the tank itself is corroding. A tank that leaks from the bottom usually needs to be replaced, not repaired, and the leak tends to get worse. Water at the bottom can also come from a drain valve that isn't fully closed, from a leak higher up running down the side, or from condensation on a gas heater. A plumber can tell which it is.
For a step-by-step on shutting off the water and checking the heater, see water heater leaking: what to do first.
What Kind of Water Damage Can It Cause?
In many homes the water heater sits in a basement or utility room next to finished space. Water runs along the slab, under the wall and into the carpet pad in the next room, then wicks up into the drywall. Stored boxes on the floor soak it up too. Because the leak is often slow, it can travel a long way before anyone notices.
Check the carpet on the other side of the utility room wall, the baseboards on both sides, and anything stored near the tank. A moisture reading tells the real answer about how far it went. We check under carpet, behind baseboards and inside the bottom of walls with meters, even where things look dry.
Water heater leaking right now? Call Blue Valley at (913) 395-8488. Open 7 AM–9 PM, every day.
What Should I Do Now?
Stay safe first. Follow the gas and electrical cautions above.
Close the cold-water supply to the heater, usually a valve on the pipe at the top, if you can reach it from a dry spot. If not, use the main shutoff.
Call a plumber to drain the tank and shut the heater down properly. Closing the supply doesn't empty the tank, so water already inside can keep leaking.
Move belongings off the wet floor and take photos.
Call for drying if water reached carpet, drywall or another room.
The plumber replaces or repairs the heater. We handle the water damage around it. Our water heater leak cleanup page explains that work, and wet carpet pad after a leak covers what usually happens to carpet and pad.
Leawood and Nearby Homes
When a water heater sits next to finished space, a leak can reach carpet and drywall before it's found. We dry basements and utility rooms after water heater leaks in Leawood, Overland Park and nearby cities. When several appliances were installed around the same time, they can also wear out within a few years of each other, so it's worth checking the washer hoses and other supply lines while the plumber is there.
Frequently Asked Questions
Can I keep using a water heater that's leaking a little?
It's better not to. A small leak from the tank usually gets worse, and a slow leak can soak walls and flooring before anyone notices. Have a plumber look at it.
Can a leaking water heater explode?
The relief valve is there to release excess pressure and temperature. If water is coming from that valve or its pipe, don't ignore it. Have a plumber check the valve and the heater.
Does homeowners insurance cover a leaking water heater?
It depends on your policy and the cause. Many policies treat the heater itself differently from the water damage it caused, and a sudden failure differently from a slow leak. Ask your agent. We document the damage and drying with photos and readings.
How do I know if the water got into my walls?
Look for swelling or peeling paint at the bottom of the drywall, but the only way to know for sure is a moisture meter.
Call our restoration team
If your water heater leaked into your basement or living space, call Blue Valley at (913) 395-8488. Open 7 AM–9 PM, every day. We're IICRC Certified & Fully Insured. We'll measure what's wet and give you a free evaluation. Read about our water damage restoration in Leawood.