Water Heater Leaking? Here's What to Do Right Now

Published June 27, 2026 - Cavinder Plumbing, Heating and Cooling - Granger, IN

Quick answer: If your water heater is leaking, do two things first: shut off the cold water supply valve above the unit, and shut off the power - turn a gas unit's control to "off," or flip the breaker on an electric unit. Then find where the water is coming from. Leaks at the temperature and pressure (T&P) valve, the drain valve, or the cold and hot fittings are usually repairable. A leak from the tank body itself means the tank has corroded through and needs replacement. Below is the step-by-step shut-off, how to find the source, and which leaks you can fix versus which mean a new water heater.

For same-day water heater service in Granger, South Bend, Mishawaka, or Elkhart, call (574) 633-4557. We carry common replacement tanks and handle active leaks 24/7.

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Step 1: Emergency Shut-Off

Stopping the water and power limits the damage and makes it safe to inspect. Do this first, in order:

1. Shut off the cold water supply. Find the cold water valve on the pipe entering the top of the tank and turn it fully clockwise (or, on a lever valve, a quarter turn so the handle is across the pipe). If you can't reach or free that valve, shut off the home's main water valve.
2. Shut off the power. On a gas water heater, turn the gas control dial on the front to "off." On an electric water heater, switch off the dedicated breaker in your electrical panel. Do not skip this - heating an emptying tank can damage the unit and is unsafe.
3. Drain the tank if needed. If water is actively pooling, attach a hose to the drain valve at the base and run it to a floor drain or outside to relieve pressure and stop the spread. Open a hot tap upstairs to let the tank drain faster.
4. Call for service. Move boxes, electronics, and anything water-sensitive away from the unit, then call (574) 633-4557 so we can diagnose and repair or replace it.

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Step 2: Find the Leak Source

Once the water and power are off, dry the area and watch where water reappears. Common sources, from most to least repairable:

• T&P (temperature and pressure relief) valve - the valve with a discharge tube running down the side of the tank. It can leak from a stuck valve or from genuine over-pressure or over-temperature, which is a safety issue worth addressing promptly.
• Drain valve - the spigot at the base. It can drip if it's loose or worn.
• Cold and hot water fittings - the connections at the top of the tank can loosen or corrode and weep.
• Condensation - on a gas unit, especially early in the heating season or when cold incoming water meets a warm tank, you may see droplets that look like a leak but are just condensation. This usually clears once the tank reaches temperature.
• The tank body - if water is seeping from the bottom seam or the shell itself, the inner tank has corroded through. This is the one source that is not repairable.

A quick way to narrow it down: dry everything, lay down paper towels, and check which spot gets wet first. Top-of-tank usually means a fitting; the T&P discharge tube means that valve; water emerging from underneath the tank usually means the tank body.

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Repairable vs. Replace

Where the leak comes from largely decides whether you're looking at a repair or a new water heater.

• Repairable: A leaking T&P valve, a dripping drain valve, or a weeping cold or hot fitting are typically fixable. These are parts and connections, not the tank itself.
• Replace: A leak from the tank body is not repairable. Once the steel tank corrodes through, sealants and patches don't last, and the tank can fail more completely without much warning. Replacement is the only reliable fix.

Age factors in too. On a tank water heater past its expected service life (commonly 8 to 12 years in Northern Indiana), even a repairable leak is often a sign the unit is near the end, and it may make more sense to replace than to keep fixing. If you're seeing multiple warning signs, our post on signs your water heater is about to fail walks through the full list and a repair-versus-replace framework.

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Is a Leaking Water Heater Dangerous?

It can be, which is why shutting it down is the right first move. The main risks:

• Water damage. A tank holds 40 to 80 gallons. If the tank body ruptures, that volume ends up on your floor, and the supply keeps feeding it until the water is shut off.
• A pressure or temperature problem. A T&P valve that's discharging may be doing its job because the tank is over-pressurized or overheating. That's a genuine safety condition, not just a drip, and should be looked at promptly.
• Electrical and gas hazards. Water near an electric unit's wiring or a gas unit's burner area is a reason to cut power and keep the area clear until it's serviced.
• Mold and structural damage from a slow, unnoticed leak over weeks.

A small drip isn't an immediate emergency the way a burst tank is, but it won't fix itself, and it's telling you the unit needs attention.

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Preventing Future Leaks

You can't make a water heater last forever, but you can get the most out of it and avoid surprise leaks:

• Flush the tank annually to clear sediment. Michiana's moderately hard water leaves mineral buildup that accelerates corrosion and overheating at the tank bottom.
• Check the anode rod every few years. This sacrificial rod corrodes so the tank doesn't; replacing a spent one can add years of life.
• Test the T&P valve periodically so it isn't seized.
• Watch the age. If your tank is past 8 to 10 years, plan a replacement on your schedule rather than after a flood - planned replacement is cheaper than emergency replacement plus water cleanup.
• Consider an upgrade. A tankless unit (Rinnai or Navien) has no standing tank to corrode and leak, and a heat-pump water heater may qualify for the federal 25C credit of up to $2,000.

When it is time to replace, see our tank water heater installation and tankless water heater installation pages. We install Sure Comfort, Rheem, A.O. Smith, Bradford White, State, Rinnai, and Navien.

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Frequently Asked Questions

Should I turn off the water heater if it's leaking?

Yes. Shut off the cold water supply valve at the top of the tank (or the home's main if you can't reach it), then shut off the power - turn a gas unit's control to off, or flip the breaker on an electric unit. This limits water damage and makes it safe to inspect. Then find the leak source and call for service.

Can a leaking water heater be repaired, or do I need a new one?

It depends on where it's leaking. A leak at the T&P valve, the drain valve, or a cold or hot fitting is usually repairable. A leak from the tank body itself means the inner tank has corroded through and is not repairable - that requires replacement. We diagnose the source and give you the options before any work.

Is it an emergency if my water heater is leaking?

A tank-body rupture is an emergency - 40 to 80 gallons can flood a space and the supply keeps feeding it. A small drip from a valve or fitting is not immediately catastrophic but still needs attention and won't fix itself. Either way, shut off the water and power first. We offer 24/7 emergency service for active leaks in Granger, South Bend, Mishawaka, and Elkhart.

Why is there water under my water heater but I can't find a leak?

It may be condensation rather than a leak, especially on a gas unit when cold incoming water meets a warm tank or early in the heating season - that usually clears as the tank reaches temperature. It could also be a slow drip from the T&P discharge tube or a fitting that only weeps under pressure. Dry everything, lay down paper towels, and watch which spot gets wet first.

How long does a water heater last before it leaks?

A standard tank water heater commonly lasts 8 to 12 years in Northern Indiana, and tank-body leaks tend to show up toward the end of that range as the steel corrodes through. Tankless units last longer (15 to 20 years with annual descaling) and have no standing tank to leak. Annual flushing and anode-rod checks help a tank reach the upper end of its lifespan.

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Leaking Now? We're Available 24/7

Call (574) 633-4557 or book online. Licensed in Indiana (CO19900013 HVAC / PC19700254 plumbing). Same-day water heater repair and replacement in Granger, South Bend, Mishawaka, Elkhart, and across St. Joseph and Elkhart County. 24/7 emergency response for active leaks and flooding.