A leaking water heater is most often caused by a failed temperature & pressure (T&P) relief valve, a loose or corroded connection, a faulty drain valve, or a rusted-through tank. Loose fittings and valves can usually be repaired, but a tank leaking from the bottom must be replaced. Shut off the water and the power or gas first, then call a licensed plumber.
Finding water around your water heater is unsettling — but try not to panic. Whether it's a slow drip or a spreading puddle, acting quickly can limit the damage and, in many cases, save the unit. Below is exactly what to do right now, what's likely causing the leak, and how to know whether you're looking at a simple repair or a full replacement.
First: What to Do Right Now
Before you worry about the cause, take these steps to protect your home:
- Turn off the power or gas. For an electric water heater, switch off the breaker that powers it. For a gas unit, turn the gas control valve to "Off." This keeps the heater from running dry and creating a bigger hazard.
- Shut off the water supply. Find the cold-water valve on top of the tank and turn it clockwise to close it. If you can't reach or turn it, shut off your home's main water valve.
- Contain and dry the area. Mop up standing water and move anything valuable away from the unit. Standing water near electrical or gas components is dangerous, and even small amounts can lead to mold.
- Call a licensed plumber. Once the area is safe, get a professional out to find the source and recommend the right fix. The faster a leak is diagnosed, the more options you usually have.
Where Is the Leak Actually Coming From?
"My water heater is leaking" can mean several very different things. Pinpointing the source is what determines whether it's a quick fix or a replacement:
- The connections up top. The cold-water inlet and hot-water outlet fittings can loosen over time. This is one of the most common — and most fixable — sources, often just needing to be tightened or resealed.
- The T&P relief valve. This safety valve opens to release pressure, and it can drip if it's doing its job (too much pressure or heat) or if it has failed. Either way it needs a professional look — excess pressure is not something to ignore.
- The drain valve. The spigot near the bottom used for flushing can fail to seal, causing a steady drip. It can usually be tightened or replaced.
- The bottom of the tank. This is the serious one. When water seeps from the base of the tank itself, it almost always means internal corrosion has rusted through the steel — and a tank in that condition cannot be repaired. It needs to be replaced before it fails completely.
Can a Leaking Water Heater Be Repaired?
It depends entirely on the source. Leaks from valves, fittings, and connections can very often be repaired — our water heater repair service handles exactly these issues, frequently the same day. But if the tank itself is leaking, repair isn't an option; the smart move is a planned water heater installation or replacement before it lets go entirely and floods the space. If you've been weighing your options anyway, our guide to the 6 signs your water heater is about to fail is a helpful gut-check, and if you're considering an upgrade, Tank or Tankless? walks through the choice.
Is a Leaking Water Heater an Emergency?
A small drip from a valve isn't necessarily a crisis — but a tank leak, a gas smell, or water near electrical connections is. Left alone, even a slow leak can warp flooring, damage drywall, and grow mold, and a failing tank can dump 40 to 50 gallons of water at once. When in doubt, shut off the water and call. If the leak turns out to be coming from nearby pipes rather than the heater itself, that's a job for our leaking pipe repair team.
How to Prevent the Next Leak
A few simple habits go a long way toward avoiding surprise leaks:
- Flush the tank once a year to clear the sediment that accelerates corrosion.
- Have the T&P valve and anode rod checked during routine plumbing maintenance.
- Keep an eye on your unit's age — most tanks last 8–12 years, and replacing one on your schedule beats an emergency.
- Head into the cold season prepared; see our post on getting your water heater ready for winter.
Leaking Water Heater? Call Double L Today
Double L Plumbing has been the name North Texas trusts for water heater emergencies since 2006. We'll find the source fast, tell you honestly whether it's a repair or a replacement, and get your hot water back safely. Every job is backed by owner and Master Plumber Mark Patterson (License #M-37950), serving Azle, Weatherford, Springtown, and Parker County.
