A water heater leaking from the bottom often means the tank itself has failed, which usually requires replacement ($900 to $3,000). Shut off the water supply and power/gas to the unit to prevent damage, then request urgent plumbing help. Some leaks come from valves or fittings and are repairable.
Likely causes
| Cause | What's happening |
|---|---|
| Tank corrosion/failure | Internal rust leads to leaks; usually means replacement. |
| Drain valve leak | Sometimes repairable without full replacement. |
| T&P valve discharge | May indicate pressure issues needing service. |
- Active flooding
- Water near electrical
- Gas smell (gas units)
If anyone is in danger, or you smell gas, leave the home and call 911 or your utility immediately.
Frequently asked questions
What causes water heater leaking from the bottom?+
Several issues can produce this symptom, from simple maintenance items to component failure. The likely causes table on this page lists what each cause looks like so you can describe the problem accurately when you request quotes.
Should I call someone right away?+
Call promptly if you see active water, no cooling during Arizona summer heat, burning smells, or repeated breaker trips. Otherwise, gather details and compare two written quotes before approving repairs.
Can PlumbAirAZ diagnose the problem?+
PlumbAirAZ is an Arizona plumbing and HVAC pricing and referral marketplace, not a contractor. We publish local price ranges and route your quote request to independent licensed service providers who contact you directly.
Related pages
Page Summary
- Topic
- Water Heater Leaking from the Bottom
- Location
- Arizona
- Best for
- Homeowners diagnosing the issue
- Primary action
- Request a professional diagnosis
- Related services
- See related pages
- Last reviewed
- June 2026
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Last reviewed: June 2026
PlumbAirAZ.com is a pricing, education, and referral marketplace. We do not perform the work unless expressly stated. Your request may be shared with or sold to independent HVAC, plumbing, or home service providers that may contact you about your project.