Start here
Quick, low-risk steps
- Check for gas odor, CO alarm, smoke, or water near electrical equipment. If present, evacuate and call 911 or utility emergency line.
- If safe, turn off the water supply valve to the heater (usually on the cold inlet pipe).
- Shut off power: for electric, switch off the breaker; for gas, turn the gas control valve to 'pilot' or 'off' (only if you can do so safely).
- Contain water with buckets or towels, but avoid hot water and wet electrical components.
- Record the model, fuel type, age, and visible leak location.
- Call a licensed plumber for inspection and repair or replacement.
Is It an Emergency?
A water heater leak can range from a slow drip to a sudden burst. The first priority is personal safety. Gas leaks, carbon monoxide, and electrical hazards can cause serious injury or death. The American Red Cross advises that after a disaster or major system failure, you should have utilities inspected by a qualified professional before turning them back on.
If the leak is large and water is spreading toward electrical outlets or appliances, treat it as an emergency. Even a small leak can worsen quickly. Never ignore water around a water heater, as it may indicate internal tank corrosion that could lead to a sudden rupture.
- Evacuate if you smell gas, hear a CO alarm, or see smoke or sparks.
- Do not touch the water heater or any electrical switches if you are wet or standing in water.
- Call 911 or your gas utility emergency line for gas odors or CO alarms.
- If the leak is manageable and no hazards are present, proceed with safe shutoff steps.
- Always have a qualified professional inspect the system before restoring power or gas.
How to Safely Shut Off Water and Power
Once you've confirmed there are no immediate dangers, the next step is to stop the water flow and de-energize the unit. This helps prevent further damage and reduces risk. Locate the cold water shutoff valve—usually a lever or wheel on the pipe above the heater. Turn it clockwise to close.
For electric water heaters, switch off the dedicated circuit breaker in your electrical panel. For gas models, find the gas control valve on the unit and turn it to the 'pilot' setting or 'off.' Only do this if you can safely reach the valve without stepping in water. If you are unsure, wait for a professional.
- Identify the cold water inlet pipe and shutoff valve.
- Turn the valve clockwise until it stops.
- For electric: locate the water heater breaker and switch it to 'off.'
- For gas: turn the gas control knob to 'pilot' or 'off' if accessible and safe.
- Open a hot water faucet in a sink to relieve pressure (optional, but can reduce leakage).
Common Leak Locations and What They Might Mean
Water can appear from several places. A leak from the top may be a loose pipe connection, a failing inlet/outlet, or a temperature and pressure (T&P) relief valve discharge. A leak from the bottom often indicates internal tank corrosion, which usually means the tank has failed and needs replacement.
A leaking T&P valve may signal excessive pressure or temperature. This is a safety device and should never be capped or plugged. If water is coming from the drain valve at the bottom, it might be loose or faulty. Only a professional can accurately diagnose the source and recommend repair or replacement.
- Top leaks: check pipe fittings, inlet/outlet connections, and the anode rod port.
- T&P valve: if leaking, do not block it; call a plumber to test system pressure.
- Bottom leaks: often a sign of tank corrosion—likely requires replacement.
- Drain valve: may be loose or have a worn washer; can sometimes be tightened.
- Record the exact location and take photos to show the plumber.
Next Steps: Repair or Replace?
After the immediate situation is controlled, you'll need to decide whether to repair or replace the unit. Minor leaks from fittings or valves can sometimes be repaired. However, a leaking tank cannot be reliably fixed and replacement is the only permanent solution.
Consider the age of your water heater. While we cannot provide a specific lifespan threshold, older units are more prone to failure. A professional can assess the condition and help you compare repair costs versus a new, possibly more efficient model. For Denver homeowners, also check local permit requirements and available rebates before proceeding.
- Ask your plumber: Is the leak repairable, or is the tank compromised?
- If replacement is needed, discuss fuel type, size, and efficiency options.
- Inquire about permits, inspections, and code requirements for your area.
- Check with your utility or local government for available rebates or incentives.
- Get a detailed written estimate covering all scope items (removal, permits, labor, warranty).
Take this with you
Evidence and scope checklist
- Is there any gas odor, CO alarm, smoke, or electrical hazard?
- Can you safely access the shutoff valve and power disconnect?
- Where exactly is water coming from (top, bottom, valve, pipe)?
- What is the water heater's model, fuel type, and age?
- Is the T&P relief valve discharging water?
- Has the leak caused water damage to surrounding areas?
- Do you have photos of the leak and unit label?
- Will repair or replacement require a permit in your jurisdiction?
- Does your insurance policy cover water damage from a water heater leak? (Check your policy.)
- Have you contacted a licensed plumber for an assessment?
Common questions
What homeowners ask next
Can I still use water in my house if the water heater is leaking?
If you have shut off the water supply to the heater, you can still use cold water from other taps. However, do not use hot water taps, as this may draw from the leaking tank. If the main water supply was turned off, no water will be available. Always prioritize safety and consult a plumber.
Is a leaking water heater covered by homeowners insurance?
Coverage depends on your specific policy and the cause of the leak. Sudden and accidental damage may be covered, but gradual leaks or lack of maintenance might not be. Contact your insurance provider to understand your coverage and any deductibles. Document the damage with photos and keep records of repairs.
Should I try to fix the leak myself?
Homeowners can safely shut off water and power and clean up water. However, actual repairs—especially those involving gas, electrical, or pressure components—should be left to licensed professionals. Improper repairs can create safety hazards and may violate local codes.
Evidence
Sources used for this guide
Research checked July 31, 2026
- Utilities and major systems after an emergencyAmerican Red Cross
Immediate utility safety and qualified-inspection boundaries.
Optional next step
Need an on-site professional?
Use the guide and worksheet first so you can describe the situation and compare the full scope. A referral is optional; you can also contact a licensed local provider directly.
We have not enabled a provider route for this site. Use the checklist to contact and verify local providers yourself; urgent hazards should go to the appropriate emergency or public service.