The short answer
Check the Connections First
Start by turning off the power to the water heater. For an electric unit, switch off the breaker. For gas, turn the gas valve to the pilot setting. Then shut off the cold water supply valve on top of the tank. This stops new water from entering while you inspect.
Look at the cold water inlet and hot water outlet pipes where they enter the tank. These connections can loosen over time or have worn-out washers. Tighten them with a wrench, but do not overtighten. If you see rust or mineral buildup around the threads, the fitting may need replacement.
- Tighten loose pipe connections with a wrench
- Replace worn washers or thread seal tape
- Look for rust that indicates a slow leak
- Check the dielectric nipples for corrosion
Inspect the Pressure Relief Valve
The temperature and pressure relief valve is a safety device that releases water if pressure builds too high. It sits near the top of the tank, often with a small lever and a discharge pipe. If it leaks, it may be stuck open or have a faulty seal.
Test the valve by lifting the lever briefly to let a little water out, then let it snap back. If it continues to drip, the valve likely needs replacement. This is a simple part available at hardware stores, but if you are unsure, a plumber can handle it.
- Test the valve by lifting the lever
- Replace if it keeps dripping after release
- Ensure the discharge pipe is not blocked
- Check the temperature setting on the thermostat
Look for Tank Corrosion
If the leak is coming from the top seam of the tank itself, corrosion is the likely culprit. Over time, sediment settles at the bottom and can cause the tank to rust from the inside. A leaking tank is not repairable; it needs replacement.
You may notice a steady drip from the top edge or a wet spot on the insulation. If the tank is more than 10 years old, replacement becomes more likely. An inspection by a professional can confirm whether the tank is the source.
- Check the top seam for wetness
- Feel for moisture on the insulation
- Look for rust streaks or discoloration
- Consider the age of the unit
Stop the Leak Quickly
Water leaking from the top can run down the sides and damage the floor, subfloor, and nearby walls. Act quickly to shut off the water supply and drain the tank if needed. Use a bucket and towels to contain the water while you work.
If the leak is from a fitting, tightening may solve it. For a valve or tank issue, you may need to replace parts or the entire heater. For any water that has already soaked into materials, water damage restoration may be necessary.
- Shut off the cold water supply valve
- Drain the tank using a hose to a floor drain
- Place a bucket under the leak to catch drips
- Dry the area with fans to prevent mold
When to Call the Pros
If you cannot find the source or the leak persists after tightening, call the pros. A water damage inspection can identify hidden moisture in walls or floors. They have moisture meters and thermal cameras to detect water that is not visible.
For water that has spread into subflooring or drywall, professional extraction and drying may be needed. If you live in Redmond, keep your shutoff valve location written down for emergencies. The pros can also help with cleanup after an appliance leak.
- Use a moisture meter to detect hidden wetness
- Check for discoloration on ceilings or floors
- Remove wet drywall to prevent mold growth
- Call for help if the leak is beyond a simple fix
Need help right now?
Phones are answered 24/7 for Redmond and nearby communities.
Call Now (425) 407-5186Frequently asked questions
Can I fix a leak at the top of my water heater myself?
Sometimes, if it is a loose fitting, you can tighten it. For a faulty pressure relief valve, you can replace it. But if the tank itself is leaking, you cannot patch it. You need a new water heater, which a plumber can install.
How do I know if the tank is leaking or just condensation?
Condensation often appears as small water droplets on the outside of the tank, especially in humid conditions. A leak from the top will drip steadily and may have a trail of water. Wipe the area dry and see if moisture returns.
What should I do while I wait for a repair?
Shut off the water supply and power to the heater to prevent further leaks and damage. Place a bucket under the leak to catch drips. Move any belongings away from the area. For significant water spread, start drying with fans and towels.