Septic Tank Leaking
Leaks work both ways: effluent escaping into the ground, or groundwater flooding into the tank.
A tank that leaks outward contaminates soil and potentially groundwater, and the liquid level inside sits lower than it should. A tank that leaks inward — common in high water table areas — floods with clean groundwater, pushes effluent through before it can settle, and overloads the disposal field.
Both are structural problems and both need eyes inside the tank, which normally means emptying it first.
Signs of a leaking tank
- Liquid level noticeably below the outlet invert
- Tank refilling unusually fast after emptying
- Persistently wet or eroded ground beside the tank
- Visible cracking in lids, walls or joints
- Field overloading with no change in household use
Safe checks
- Look for surface subsidence or damp ground near the tank
- Note whether problems worsen in wet seasons
- Gather any records of tank age and construction
What not to do
- Do not enter or lean into the tank
- Do not attempt to patch a tank yourself
Frequently asked questions
- Can a leaking tank be repaired?
- Minor cracking can often be repaired or lined. Significant structural failure or a tank taking substantial groundwater usually needs replacement, and a provider will assess it empty.
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