Emergencies
Water heater leaking — what to do now
First: turn off the water to the heater or the main water supply if you can do it safely. A leaking water heater can quickly damage floors and walls, but you can slow the damage and get help fast.
First 5 minutes — shut off your water
If water is flooding, stopping it comes first. Here's the fastest safe order.
- 1 Shut off the water main. Find your main shut-off valve — usually where the water line enters, near the street, the basement, or the meter — and turn it fully clockwise to stop the flow.
- 2 Stay safe. Keep clear of standing water near outlets or appliances. If you smell gas or see water near electrical panels, leave and call emergency services first.
- 3 Limit the damage. Open a low faucet to drain the lines, move valuables, and soak up water you can reach safely. Take a few photos for your records.
- 4 Get a licensed plumber. Get matched, free, with a licensed 24/7 plumber near you. Ask for the price in writing before work starts — you compare and choose who to hire.
What to do right now
- Turn off the water supply to the water heater if you can do it safely. If you cannot find that valve, shut off the home's main water supply. If you need help finding it, see how to shut off your water.
- If water is near outlets, cords, or electrical panels, stay back and call your local emergency number first. Do not touch standing water near electricity.
- Turn off power to the heater only if you can do it safely. For a gas water heater, if you smell gas, leave right away and call your local emergency number.
- Move towels, buckets, and small items away from the leak if it is safe. Try to protect floors and nearby belongings, but do not put yourself at risk.
- Take a few photos of the leak and where the water is pooling. This can help when you speak with a plumber.
- If the leak is active, request help now through MainLine Match. We are a free matching service, not a plumbing company, and we can help connect you with a licensed, insured 24/7 emergency plumber near you.
Is this a real emergency or can it wait?
A water heater leak is often an emergency if water is actively pooling, dripping fast, spreading into walls or ceilings, or causing damage to flooring. It is also urgent if the tank itself appears to be leaking, the heater is making unusual popping or hissing sounds, or you suddenly have no hot water along with visible leaking.
Call for urgent help now if the leak is steady, the area is flooding, the heater is old and rusted, or the leak is coming from the bottom of the tank. Tank leaks usually do not get better on their own.
It may be less urgent if there is only a small drip from a fitting, valve, or pipe connection and you have already stopped the water. Even then, it is smart to have a licensed plumber check it soon, because a small leak can turn into a bigger one without much warning.
If you are not sure, treat active leaking as urgent. You can also visit our emergency plumbing hub for other fast triage steps.
What usually causes a water heater to leak
Some leaks come from parts attached to the heater, not the tank itself. A loose water line, a worn valve, too much pressure, or condensation can all look like a tank leak at first. In some cases, a plumber can repair the part without replacing the whole unit.
Other leaks mean the tank may be failing. Rust, age, internal corrosion, or sediment buildup can damage the inside of the tank over time. When the tank body itself starts leaking, replacement is often more likely than repair.
Common possibilities include:
- Loose or damaged inlet or outlet connections
- A leaking drain valve
- A pressure or temperature relief valve problem
- Corrosion inside an older tank
- Cracks or failure at the bottom of the tank
- Condensation that is mistaken for a leak
A licensed plumber can tell the difference on site. MainLine Match does not diagnose plumbing problems or perform repairs. We only help connect households with local licensed, insured plumbers.
Can it be repaired, or does it need replacement?
Sometimes the answer is simple: if the leak is from a connection, valve, or other external part, repair may be possible. If the leak is from the tank body or bottom seam, replacement is often the more likely outcome.
Age matters too. Many tank-style water heaters become more failure-prone as they get older. A plumber may suggest replacement if the unit is near the end of its service life, has visible rust, or has had repeated problems.
Ask the plumber to show you exactly where the leak is coming from and explain your options in plain language. You are allowed to pause, ask questions, and get the price in writing before work starts.
Watch for red flags:
- Vague prices with no written breakdown
- Pressure to approve a very large repair immediately
- Scare tactics
- Cash-only demands
- No proof of license or insurance
You stay in control. Confirm the price before work starts, choose who to hire, and confirm the work is done before paying the final amount.
Honest cost range: repair vs replacement
The cost depends on what is leaking, whether parts are needed, the size and type of heater, and when the plumber comes out. Nights, weekends, and holidays usually cost more. Prices also vary by city and region, so these are general ranges only, not quotes.
Common emergency-related ranges many households may see:
- Emergency diagnostic or service call: about $100 to $350+
- Minor leak repair at a valve or connection: about $150 to $600+
- Pressure relief valve or similar part replacement: about $200 to $700+
- Water heater replacement for a standard tank unit: often about $1,200 to $3,500+
- Higher-end systems, difficult access, code updates, or larger units: can run higher
The total can go up if there is water damage, if the heater is in a tight space, if shutoff valves are stuck, or if extra work is needed to meet local code. Sewer, drainage, and building responsibility rules also vary by area. For more on plumbing price ranges, see our cost guides.
Before you approve work, ask for:
- The total price in writing
- What is included and what is not
- Whether this is repair or replacement
- Whether after-hours pricing applies
- The expected parts needed
MainLine Match is free for the household. We are not a plumbing company, and we do not set the plumber's prices.
How to get a licensed 24/7 plumber fast
If your water heater is actively leaking, the fastest next step is to get matched now. Through MainLine Match, you share basic contact and problem details only: your name, phone number, optional email, problem type, ZIP code, and preferred language. We do not ask for bank information, Social Security numbers, income details, or sensitive personal records.
We are a free matching service, not a plumber or contractor. Our job is to help connect you with a local licensed, insured plumber who handles emergency calls. Availability depends on your area, the time of day, and who is open.
When the plumber contacts you, ask:
- Are you licensed and insured for this work?
- What is the service call or diagnostic charge?
- Do you charge more after hours?
- Can you give the price in writing before work starts?
- If the tank is leaking, do you think this is likely repair or replacement?
If you want help now, start here: get matched.
If your water heater is leaking, shut off the water first if it is safe, stay away from electrical or gas danger, and get a licensed plumber to check whether it needs a repair or full replacement.
Common questions
My water heater is leaking from the bottom. Is that bad?
It can be serious, especially if water is actively pooling. A leak from the bottom may mean the tank itself is failing, which often needs urgent attention from a licensed plumber.
Should I turn off the water if my water heater is leaking?
Yes, if you can do it safely. Turn off the water supply to the heater, or the home's main water supply if needed, to help stop more water from escaping.
Can I still use hot water if the heater is leaking?
It is usually safer to stop using it and have it checked. Continued use can make leaking and water damage worse.
How much does it cost to fix a leaking water heater?
Small repairs may be a few hundred dollars, while replacement can cost much more. The real cost depends on the problem, parts, time of day, and your area, so any range online is not a quote.
How fast can I get a plumber?
That depends on your location, time of day, weather, and who is available. MainLine Match is a free matching service and cannot guarantee arrival times, but we help connect households with local 24/7 plumbers.
What if I smell gas near the water heater?
Leave immediately and call your local emergency number first. Do not stay inside to investigate, and do not try to handle a possible gas problem yourself.