A tank leak can be simple, like a float valve that won't shut, or deeper, like a crack in an underground tank wall. Knowing likely causes helps you describe the problem and anticipate the repair.
Common causes
Frequent causes:
- Cracks in tank walls or floor
- Internal lining deteriorating over time
- Leaks around pipe inlets and outlets
- A float valve that won't shut, causing overflow
- Damaged nearby valves and connections
- Soil movement around an underground tank
How to spot a leak
Close the supply and outlets and watch the level for several hours without use. A drop points to a leak in the tank or its connections. For overhead tanks, watch for damp around the base and in the ceiling below; for underground tanks, damp or settlement around it.
Local repair or rehabilitation?
A connection or float leak may be fixed directly; cracks and worn linings need the tank emptied and inspected inside. Large cracks or ones with settlement call for a proper structural assessment.
This is general information, not a diagnosis of your home. To identify the cause, contact us to arrange an assessment.