Water Heater Leak: How to Spot It and Stop It Fast

If you see water pooling around your heater, hear dripping sounds, or notice a drop in hot water, you probably have a leak. Ignoring it can waste money, damage floors, and even cause rust inside the tank. The good news is many leaks are easy to find and fix before they turn into a big problem.

Common Reasons Your Water Heater Leaks

Leaking tanks usually have a few usual suspects. The most common is corrosion – over time the metal inside the tank rusts and creates tiny holes. Another frequent culprit is the temperature and pressure (T&P) relief valve. If the valve gets stuck or the pressure gets too high, it will drip water to protect the tank.

Loose or worn‑out fittings can also cause drips. Check the inlet and outlet connections, the vent pipe, and the drain valve. A cracked pipe or a loose nut will let water escape. Finally, a faulty dip tube – the pipe that sends cold water to the bottom of the tank – can break and let water spill over the top.

DIY Steps to Fix a Small Leak

Before you call a plumber, try these quick checks. First, turn off the power or gas to the heater and shut the cold‑water supply. Then, dry the area with a towel and look for the exact spot where water is coming out.

If the leak is at a fitting, tighten the nut with a wrench. Don’t over‑tighten—you might crack the pipe. For a leaking T&P valve, lift the test lever briefly to let any built‑up pressure out, then reseat the valve. If the valve continues to drip, replace it; they’re cheap and easy to install.

When the tank itself is rusting, you’ll need a professional. A corroded tank can’t be patched safely, and a new unit is usually the best option.

Don’t forget to check related issues while you’re at it. A water heater that won’t turn on, or one that’s suddenly delivering cold water, often points to the same underlying problems—like a faulty heating element or a blocked dip tube. Resetting the heater’s breaker, as explained in our "Do I Need to Turn Off the Breaker to Reset Your Water Heater?" guide, can sometimes solve minor glitches.

If you’ve tried the simple fixes and water is still escaping, it’s time to call a local pro. Northampton Appliance Repairs Services can diagnose the exact cause, replace parts safely, and give you a warranty on the work. They’ll also inspect the whole system to make sure there’s no hidden damage that could cause more leaks later.

Bottom line: a leaking water heater isn’t something to live with. Spot it early, try the easy fixes, and call an expert if the tank itself is damaged. Quick action saves money, protects your home, and gets your hot showers back on track.