A leaking water heater can range from a loose connection to a failed tank, and the safest response depends on where the water is coming from. Shut off the energy source only if you can do so safely, limit water use, and arrange an evaluation when the leak is active or unexplained.
Find the General Source
Look from a safe distance for water around the tank base, fittings, temperature-and-pressure relief piping, drain valve, supply connections, or nearby floor. Water can travel from another fixture and collect near the heater, so the visible puddle does not always identify the source. Do not touch wet electrical components or attempt a repair while water is actively spraying.
Make the Area Safer
If the leak is substantial, shut off the cold-water supply to the heater if the valve is accessible and operates normally. Turn off gas or electrical power according to the equipment instructions and only when there is no immediate safety concern. If you smell gas, leave the area and contact the appropriate emergency service rather than operating switches.
What May Be Checked
A leaking fitting, flexible connector, drain valve, or relief valve may be repairable. Corrosion at the tank, water emerging from the bottom seam, repeated relief discharge, or damage to the surrounding cabinet may indicate a more involved decision. The heater type, age, installation, sediment, pressure, and available replacement options can affect the recommendation.
Useful Information to Gather
Take note of whether the water is hot, when the leak began, whether the heater is making unusual sounds, and whether hot water has changed. Photographing the area from a dry, safe position can help explain the issue. Clear access around the heater, but do not remove panels or disconnect parts unless directed by a qualified professional.
When It Is Urgent
A small leak can become a larger one, damage flooring, or create a burn, electrical, or gas hazard. Do not rely on a bucket as a long-term solution. If the water is near wiring, the heater is unstable, or the leak is rapidly increasing, keep people away and seek prompt help.
Repair or Replacement
Ask whether the source can be repaired, whether the tank itself is compromised, and what testing will follow. If replacement is considered, discuss capacity, fuel type, venting, space, connections, code-related requirements, and removal of the old unit. The least disruptive option is not always the best long-term option.