Water Heater Leaking: Find the Source
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A water heater leak can come from loose supply fittings, a leaking drain valve, a discharging temperature and pressure relief valve, condensation, or the tank itself. Fittings and valves can usually be repaired. A leak from the tank body usually means the tank has rusted through and needs replacement, which Angi estimates at $880 to $1,800.
Last reviewed October 19, 2026.
Where is the water coming from?
| Source | What it usually means | Repairable? |
|---|---|---|
| Pipe fittings on top | Loose connection or worn flex line | Usually |
| Drain valve near the bottom | Worn or loose valve | Usually |
| Relief valve or its discharge pipe | High pressure or temperature, or a failing valve | Usually, but find the cause |
| Under the tank, no visible source | Corroded tank | Usually replace |
| Small amount when the tank is cold, gas unit | Condensation | Often normal |
Why does a relief valve leak?
The temperature and pressure (T&P) relief valve opens to protect the tank. Repeated discharge can mean high water pressure, thermal expansion in a closed system, a thermostat set too hot, or a worn valve. A plumber may recommend a pressure regulator check or an expansion tank.
What do leak repairs cost?
Angi national estimates: relief valve replacement up to about $200, expansion tank $100 to $400, standard tank replacement $880 to $1,800.
When should you call an emergency water heater pro in Ventura?
Call for urgent help, and leave the house first where noted, if any of these apply:
- You smell gas (a rotten-egg odor) near the water heater: leave right away without flipping switches, then call 911 or SoCalGas from outside.
- A carbon monoxide alarm sounds, or you see soot, scorch marks, or flames outside the burner area: get everyone outside and call 911.
- The tank is actively leaking or water is spreading toward walls, flooring, or electrical outlets. Shut off the cold-water valve above the tank.
- The temperature and pressure relief valve is discharging hot water repeatedly, or the tank is making loud banging sounds.
- Water from the hot tap is scalding hot, or steam comes out of faucets.
- There is no hot water and someone at home needs it for medical or caregiving reasons.
If you smell gas or a carbon monoxide alarm goes off, leave the building first and call 911 or SoCalGas from outside. Don't wait for a plumber.
Where is water heater leaking help available near Ventura?
Requests are taken from Ventura and these nearby communities:
What do people ask about water heater repair in Ventura?
Can a leaking tank be patched?
Generally no. Once the steel tank corrodes through, replacement is the safe option.
Is a little water under a gas water heater normal?
Some condensation can occur when a gas heater fires with cold water inside. Ongoing puddles are worth checking.
Should I cap a dripping relief valve pipe?
Never. The relief valve is a safety device. Capping or plugging it can be dangerous.
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