When the tank itself has failed
Septic tanks can last decades, but older concrete tanks crack, deteriorate from sewer gases, or lose their baffles. Undersized tanks in older homes can also be a problem as household water use grows.
Signs a tank needs replacement
- Cracks letting groundwater in or effluent out
- Deteriorated walls or lid
- Collapsed or missing baffles that can't be replaced
- A tank too small for current code or household size
Tank options
- Precast concrete: the most common, very durable
- Plastic or fiberglass: lighter, used where access is tight
Process
Permitting, pumping and removing or abandoning the old tank, setting the new tank, reconnecting lines, and inspection. Many tank replacements are completed in a day once permitted.
Related Septic Repair Topics
Septic RepairDrainfield ReplacementPump & Alarm RepairPumping & InspectionSeptic-to-SewerAlarm Going OffBackups & Slow DrainsSoggy Yard / Wet DrainfieldSeptic SmellCost Guide
Frequently Asked Questions
How much does septic tank replacement cost?
Often about $3,000 to $8,000 for the tank alone, more if the drainfield is also replaced.
Can I upgrade my tank size?
Yes, and current rules may require it based on bedrooms.
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