A puddle around your water heater ranges from a simple fix to a sign the tank has failed. Where it’s leaking from tells the story — and it’s worth acting before it floods.
Written bySteven Lockhart·Reviewed byMiguel Lopez, Owner & Licensed Plumber, New Pro Plumbing (CSLB #974600)·Last reviewedAugust 2026 · 7 min readQuick Answer
A leaking water heater may be a fixable fitting or a failed tank. If it’s leaking from a valve or connection at the top, it’s often repairable; if it’s leaking from the bottom of the tank itself, the tank has usually failed and needs replacement. Shut off the water and power or gas to the unit, then call New Pro — 24/7 across West LA.
The location of a water heater leak is the biggest clue to whether it’s a repair or a replacement. Leaks from the cold-water inlet or hot-water outlet connections, the temperature-and-pressure (T&P) relief valve, or the drain valve at the base are often fixable — a fitting, a valve, or a loose connection. A leak coming from the bottom of the tank itself is a different story.
Water heater leaking — Water heater leaking repair is the diagnosis of a leaking tank water heater — identifying whether the source is a repairable valve or connection or a failed tank — and the corresponding repair or replacement.
When the tank is corroding through, no repair will save it, which is why a leaking water heater is a common call for an emergency plumber — the sooner it’s assessed, the smaller the mess.
A leak from the inlet, outlet, or T&P valve up top is often a repairable fitting or valve — see water heater repair.
Water pooling under the tank usually means it’s corroded through and needs replacing.
Stop the water and the energy source, then let us assess.
Close the cold-water valve on top of the heater.
Gas: turn the gas control to off. Electric: flip its breaker.
Towels or a pan; move stored items away from it.
See whether it’s leaking from the top fittings or the base.
We assess repair versus replacement, 24/7.
If the tank’s failed, we drain and swap it safely.
No hot water and a leak? A failed tank often means both — see no hot water. If water’s spreading fast, treat it like a burst and shut the main.
Water pooling under the heater? Shut it off and call — don’t let it flood.
Get a Free QuoteA water heater rarely fails without warning — the warning is just easy to miss. Small leaks from the base, rust-tinted water, popping or rumbling sounds from sediment, and a unit that’s simply old are all signs the tank is on its way out. The homeowners who avoid a flooded garage are usually the ones who noticed a little water at the base and had it looked at, rather than mopping it up and moving on. A tank leaking from the bottom is the clearest signal of all.
Age is the other half of the story. Most tanks last 8 to 12 years, and once a unit is in that window, a leak is far more likely to mean the tank than a fitting. If yours is old, replacement is often the smarter money even before a catastrophic failure — and a modern, efficient unit can lower operating costs. The U.S. EPA and DOE’s ENERGY STAR program outlines how much more efficient current water heaters are, which is worth weighing when a failing tank forces the decision anyway.
A replacement is also a code and permit matter, not just a swap. In earthquake-prone LA, water heaters must be seismically strapped, vented correctly, and fitted with a proper T&P discharge — and the work is permitted. We handle that through the Los Angeles Department of Building & Safety and work under a license you can verify with the CSLB (#974600), so your new heater is safe, compliant, and documented.
The leak’s source and the unit’s age decide it.
| Leak source | Likely fix | Note |
|---|---|---|
| Inlet/outlet fitting | Reseal / replace fitting | Repairable |
| T&P or drain valve | Replace the valve | Repairable |
| Bottom of tank | Replace the heater | Tank has failed |
If it’s a replacement, we size and install it to code — flat-rate, the way 24/7 emergency plumbing should be.
A valve or fitting repair is far cheaper than a new water heater, so the diagnosis matters. If the tank’s failed, replacement cost depends on the unit’s size and type and on bringing the install up to current code — seismic strapping, a proper T&P discharge, and a permit. We quote the whole job flat-rate before starting.
Even on an emergency swap, we quote first — see how our emergency plumbing service prices flat-rate.
A homeowner finds water spreading across the garage floor from the base of an 11-year-old water heater.
New Pro confirms the tank has corroded through, shuts it down, and replaces it with a correctly sized, code-compliant unit.
The leak's gone, the new heater is strapped and permitted, and the garage is saved from a full tank failure.
The Bottom Line
A leaking water heater is a fork in the road: a small valve fix, or a tank that’s telling you it’s done. The bottom-of-the-tank leak is the one not to ignore — a corroded tank can eventually let go all at once. Shut off the water and energy, and get it assessed before it floods.
It can be. A slow drip from a valve isn’t a crisis, but a tank leaking from the bottom is a warning that it’s corroding through and could eventually fail all at once, releasing its full contents. Either way, shut off the cold-water supply valve on top and the power or gas to the unit to stop the leak and prevent damage, then have it assessed promptly. A failed tank won’t recover, and waiting risks a much bigger mess.
It depends entirely on where it’s leaking. If the source is a fitting, the cold or hot connection, the temperature-and-pressure relief valve, or the drain valve, those are usually repairable or replaceable. But if the tank itself is leaking — typically visible as water from the bottom — the steel has corroded through, and no repair will fix that. At that point the water heater needs to be replaced, not repaired.
A leak from the bottom of the tank almost always means internal corrosion has eaten through the steel. Over years, sediment builds up in the base and the tank rusts from the inside, especially once the sacrificial anode rod is used up. Once the tank wall is breached, it will only get worse. This is the classic sign that the water heater has reached the end of its life and needs replacing rather than repairing.
A conventional tank water heater typically lasts around 8 to 12 years, though it varies with water quality, maintenance, and use. Hard water and neglected maintenance shorten that; periodic flushing and anode-rod replacement can extend it. If your unit is in that age range and starts leaking from the tank, its age plus the leak usually points clearly toward replacement rather than sinking money into a repair on a heater that’s near the end anyway.
Generally, yes. Replacing a water heater in Los Angeles typically requires a permit, and the installation has to meet current code — including seismic strapping (important in earthquake country), a proper temperature-and-pressure relief discharge line, and correct venting for gas units. We handle the permitting and install to code as part of the job. Permitted work protects you and keeps your home’s records clean for resale.
Written by the New Pro Plumbing content team and reviewed for technical accuracy by Miguel Lopez, owner and California-licensed plumber (CSLB #974600). Guidance follows U.S. EPA, CSLB, and LADBS sources where cited. Any figures reflect New Pro Plumbing's flat-rate practice and West LA conditions, not a quote — we confirm pricing in writing before any work begins.
Last reviewed: August 2026.
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