What To Do If Your Water Heater Starts Leaking

A leaking water heater is one of those problems that can go from small to serious fast.

Sometimes it’s just a loose fitting.
Other times, it’s the tank failing, and that can turn into water damage quickly.

If you see water around your heater, don’t ignore it.

Here’s what to do.

1. Don’t Panic, But Don’t Wait Either

First thing, figure out how bad it is.

Small drip from a connection?
Slow pooling at the base?
Or active leaking from the tank?

Even a small leak can turn into a bigger problem, so the goal is to contain it and stop the source as quickly as possible.

2. Turn Off the Water Supply

Your water heater should have a shut-off valve on the cold water line above the unit.

Turn that valve off.

This stops more water from entering the tank and limits how much can leak out.

If the valve won’t turn or is stuck, you may need to shut off water at the house.

3. Shut Off the Power or Gas

This step is important.

If you have an electric water heater:
– Turn it off at the breaker

If you have a gas water heater:
– Turn the gas control valve to the “off” position

Running a heater while it’s leaking can damage the unit and create safety risks.

4. Identify Where the Leak Is Coming From

Not all leaks mean you need a full replacement.

Check common areas:

Top connections (hot/cold lines)
Shut-off valve
Drain valve at the bottom
Temperature & pressure (T&P) relief line

If the leak is coming from one of these, it may be repairable.

If the leak is coming from the bottom of the tank itself, that usually means internal failure.

At that point, replacement is typically the only option.

5. Contain the Water

If water is pooling:

Use towels or a wet vac
Place a bucket under active drips
Make sure water isn’t spreading into walls or flooring

If your heater is in a garage, this is easier.
If it’s inside the home or attic, act quickly to prevent damage.

6. Call a Licensed Plumbing Company

Once things are stabilized, it’s time to get a professional involved.

A proper evaluation will determine:

Whether the issue is repairable
If the tank has failed
If any code updates are required
What your replacement options look like (if needed)

You should always get a clear explanation of what failed and why, not just a recommendation.

What Causes Water Heaters to Leak?

In Arizona, the most common causes are:

Hard water sediment buildup
Internal tank corrosion
Worn-out anode rods
Pressure issues
Old age (typically 6–12 years here)

Once the tank itself starts leaking, it won’t “seal back up.”
It will continue to get worse.

Signs a Leak Was Coming

Most water heaters give warning signs before they leak:

Rust-colored hot water
Popping or rumbling noises
Reduced hot water capacity
Inconsistent temperatures
Visible corrosion around fittings

Catching these early can prevent a full failure.

Repair vs. Replacement

Here’s the simple breakdown:

Repairable leaks:

Fittings
Valves
Supply lines
T&P valve discharge

Usually requires replacement:

Tank leaking from the bottom
Internal corrosion
Multiple failing components
Older units nearing end of life

How to Prevent Future Leaks

You can extend the life of your water heater with a few simple steps:

Flush the tank every 6–12 months
Inspect the anode rod every few years
Monitor water pressure
Install a water softener (especially in Arizona)
Address small issues early

Preventative maintenance makes a big difference.

Stay Ahead with the Rapid Rooter Membership

Most water heater failures aren’t sudden, they build up over time.

Our Rapid Rooter Plumbing & Air Membership is designed to catch those issues early.

It includes:

Priority Scheduling – Skip the wait during busy summer months.
Annual Multi-Point Plumbing Inspection – Spot leaks before they drive up your bill.
Bi-Annual Drain Cleaning & Inspection – Maintain smooth flow during high-use seasons.
Semi-Annual Water Heater Flush – Keep your system running efficiently.
Exclusive Discounts – 10% off all repairs, and up to $300 off major installs.
24/7 Emergency Service – No extra charge for nights, weekends, or holidays.
Satisfaction-Backed Service Guarantee – Confidence in every job.
Transferable Coverage – Moving within our service area? Your membership moves with you.
No Hidden Fees – Clear pricing, every time.

Conclusion

If your water heater starts leaking, the goal is simple:

Stop the water.
Shut down the system.
Figure out the source.
Get a professional involved.

Some leaks are small.
Some mean it’s time to replace the unit.

Either way, acting quickly protects your home and keeps the situation under control.

If you need help diagnosing a leak or replacing your water heater, Rapid Rooter Plumbing & Air is here to help.

Call/Text

(623) 581-0346

Visit

RapidRooterAZ.com

location

Serving Phoenix, Peoria, Glendale, Surprise, Scottsdale & the West Valley