What to do in the first few minutes
Find the cold water supply valve on top of the heater. Turn it clockwise until it stops. If the valve is stuck or the heater is flooding fast, close the main shutoff to the house instead, which is usually near the street side of the home or at the meter box.
Then deal with the energy source, but only if it is safe to reach. For an electric heater, the breaker should be switched off at the panel, and only if the floor around the panel is dry. For a gas heater, turn the gas control knob to off. If you smell gas, leave the house and call the gas utility or 911 before you do anything else.
Safety first
Do not step into standing water near an electrical panel, outlets, or the heater itself. If the panel is wet or the water is deep, stay out and call your electric utility or 911 before calling the restoration line.
Never relight a gas heater that has been flooded or that sits in water. A gas smell means everyone leaves the building and calls the gas utility or 911.
Talk to dispatch
Describe what you see and we will tell you what happens next, in plain words, before any work starts.
Drain the tank or leave it alone?
If the tank is leaking slowly from a fitting or the relief valve, you can attach a garden hose to the drain valve at the bottom and run it outside or to a floor drain. Open a hot tap somewhere in the house so air can enter and the tank can empty. Water from the tank can be very hot, so let it cool first if the heater was running.
If the tank itself has split, draining it stops the flow, but leave the plumbing repair to a licensed plumber. This guide does not cover how a replacement must be installed or what local plumbing rules require, since that is a question for the plumber and the city.
What damage to expect
| Area | What water does | What usually happens next |
|---|---|---|
| Closet or utility room floor | Soaks vinyl, laminate, or tile underlayment | Wet flooring pulled, subfloor dried and checked |
| Drywall at the base | Wicks water upward behind paint | Baseboard removed, wall cavity opened and dried, wet sections cut out |
| Adjacent rooms | Water travels under walls into carpet and hardwood | Moisture mapping with a meter and thermal imaging camera |
| Attic or garage installs | Drips through ceilings or soaks stored items | Ceiling and insulation inspected, items sorted |
| Slab or crawl space | Moisture lingers under flooring | Air movers and dehumidifiers until readings are dry |
A tank failure usually releases clean water at first, which is why quick drying matters. Water left in place turns into a worse problem.
Why drying beats mopping
Mopping gets the visible puddle. It does nothing for the water inside drywall, under laminate and in the subfloor. Emergency water removal crews use submersible pumps or portable extraction units to pull the bulk, then air movers and LGR dehumidifiers to take out the rest.
Wet flooring and drywall that stay damp for more than a couple of days can start to grow mold, and moisture hides inside walls. If the loss looks bigger than a closet, a water damage cleanup visit with a moisture meter tells you how far it traveled.
What to document before anything gets thrown away
- Photograph and video the heater, the label with the model and age, the leak point, and every wet surface.
- Note the time you discovered the water and the steps you took to stop it.
- Keep the damaged parts, such as a failed fitting, for the adjuster if you can safely store them.
- Save receipts for temporary repairs, drying and any hotel or storage costs.
- Write a list of damaged contents with brand and approximate age.
- Do not make permanent repairs until your insurer has had a chance to inspect.
Sudden failure versus a slow leak
Texas Department of Insurance guidance says home policies generally cover sudden and accidental water damage, with a burst pipe or a broken washing machine hose as examples. Gradual leaks and seepage are usually excluded, along with any mold that results. A tank that splits open on a Tuesday afternoon often falls on one side of that line, and a drip that rotted a closet floor over many months often falls on the other.
Insurers may also deny a claim if you did not protect the property from more damage, so shutting off the water matters for the claim as well as the floor. Check your policy, report the loss promptly, and ask your insurer what it needs. We cannot say what any policy will approve.
Getting help nearby
Our network of licensed and insured restoration professionals serves The Colony and the neighboring cities. If your heater is in a home near the Plano line, the Plano service area page has more detail, and Little Elm covers the north side of Lewisville Lake. Same-day response when available.
Local note
Water heater trouble and The Colony's utilities
Not every leak starts at the tank. If water is coming from the service line, or the meter side of your connection, the problem belongs to the utility rather than to your plumbing. The Colony Water Utility is city-owned, and the city lists a water and sewer emergency line that runs during business hours, with a separate number after hours. Both are published on the city's website, so look them up before you start digging around the meter.
Winter is the other local factor. National Weather Service normals for the Dallas-Fort Worth area show an average of 29 freezes per season, and the severe winter storms of February 2021 led FEMA to designate Denton County for assistance under DR-4586. Freezing weather stresses supply lines and fittings around garage and closet heaters, and a leak that appears after a cold snap may have started with a cracked fitting rather than the tank.
Frequently asked questions
What should I do first if my water heater is leaking?
Shut off the cold water supply valve on the heater, or the main house valve if it will not close. Then turn off the breaker or gas control if the area is dry and safe to reach.
Is a leaking water heater covered by insurance?
A sudden and accidental failure is often covered, while a gradual leak or wear is often excluded. Policies differ, so check yours and ask your insurer.
How much water can a failed tank release?
A typical residential tank holds dozens of gallons, and the supply line keeps feeding it until the valve is closed. That is why the shutoff comes first.
Can I run the heater again after a small leak?
Not until the cause is found and fixed by a licensed plumber. Gas units that were in water should be checked professionally before relighting.
Who do I call in The Colony if the leak is at the meter?
A leak on the utility side of the meter is a matter for the city's water and sewer emergency line, which the city publishes for business hours and after hours.
Could the February 2021 freeze have damaged my heater lines?
Cold weather can crack fittings and supply lines that fail later, so photograph any damage and ask your insurer how it treats a loss tied to that storm.