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What Are the Signs of a Corroded Water Heater?

Last updated October 26, 2026

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The short answer

Rusty Water and Metallic Taste

When you turn on the hot water faucet, check the color and smell. Brown, orange, or reddish water means rust is coming from inside the tank or the pipes. A metallic taste or a rotten egg smell can also point to corrosion inside the water heater. These signs often appear before any visible damage on the outside.

Rusty hot water usually means the inner glass lining has broken down, exposing the steel tank to moisture. Once that happens, the tank begins to corrode from the inside out. You might notice the discoloration only in hot water, not cold. That distinction helps you narrow the problem to the water heater rather than the supply lines.

  • Brown or orange water from hot taps only
  • Metallic or sulfur-like smell in hot water
  • Rust flakes or particles in the water
  • Discoloration that clears after running the tap for a minute

Visible Rust and Leaks

Look at the outside of the water heater, especially around the tank, the pipes, and the drain valve. Rust streaks, orange stains, or bubbling paint on the tank surface are clear warnings. Small drips or puddles near the base can mean the tank has corroded through, and a leak is often the first sign that failure is near.

A leaking tank is not something to ignore. Water that pools around the heater can soak into flooring, drywall, and nearby belongings. In a humid climate, that moisture can lead to mold growth within a couple of days. If you see water, shut off the water supply to the heater and drain it if you can do so safely.

  • Rust streaks or orange stains on the tank exterior
  • Bubbling or flaking paint on the metal surface
  • Moisture or puddles around the base of the heater
  • Corrosion on the water pipes connected to the unit

Popping or Rumbling Sounds

Sediment builds up at the bottom of the tank over time, especially in areas with hard water. When the burner heats that sediment, it can cause popping, rumbling, or cracking sounds. These noises mean the tank is working harder than it should, and the buildup can accelerate corrosion on the tank floor.

If you hear these sounds, it is a sign that maintenance has been missed for a while. Flushing the tank can remove some sediment, but if corrosion has already started, flushing alone will not fix the damage. A professional inspection can tell you whether the tank is still safe to use or needs replacement.

Age of the Water Heater

Most water heaters last about 8 to 12 years, but that lifespan depends on water quality, maintenance, and usage. If your heater is older than 10 years and shows any signs of corrosion, the risk of a sudden failure increases. An aging tank with rust or leaks is more likely to burst and flood your home.

Check the manufacturer's label or serial number on the side of the tank to find the installation date. If the heater is old and you notice any of the earlier signs, consider replacing it before a failure occurs. A proactive replacement is often less disruptive than dealing with a major water leak and the cleanup that follows.

What to Do Next

If you spot any of these signs, start by shutting off the water supply to the heater and, if possible, the power or gas. This stops further water flow and reduces the risk of a burst. Then, call a local water damage pro to assess the situation, especially if water has already leaked onto your floors or walls.

A water damage inspection can identify hidden moisture and help you document the damage for your insurance claim. Policies vary, and your insurer decides what is covered. Keep records of any repairs or replacements, and take photos of the rust, leaks, and water stains. Acting quickly can limit the damage and make cleanup easier.

  • Shut off the water supply and power or gas to the heater
  • Take photos of visible rust, leaks, and water stains
  • Call a local water damage pro for inspection and cleanup
  • Check your insurance policy to understand what is covered

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Frequently asked questions

Can a corroded water heater be repaired?

Sometimes, if the corrosion is only on the outside or in the pipes, a repair may work. But corrosion inside the tank usually means the unit needs replacement. A professional can inspect the tank and tell you whether it is safe to keep using. Do not ignore leaks, as they can worsen quickly.

How long does a water heater last before corroding?

Most water heaters last 8 to 12 years, but that depends on water quality and maintenance. Regular flushing can reduce sediment buildup and slow corrosion. In areas with hard water, the tank may corrode faster. If your heater is over 10 years old, watch for rust and leaks more closely.

What should I do if my water heater is leaking?

Shut off the water supply to the heater and turn off the power or gas. Then, call a local water damage pro to handle any water that has already leaked. A leaking tank can cause significant damage to your floors and walls. Do not wait, since even a small leak can lead to mold and structural issues.

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