Cracked, leaking, or collapsing tank — repair vs. full tank replacement.

Whether a damaged tank gets repaired or replaced depends on more variables than can be resolved in writing — the material, the nature of the damage, the age of the system, the site, and critically what your county will permit as a repair versus what triggers a new design.

Broadly: a cracked fibreglass tank usually gets replaced. A concrete tank with localised damage may be repairable, but the cost of excavating and opening it has to be weighed against replacement. A tank that is failing structurally, or that no longer meets current standards, generally is not worth patching.

The step that decides it is a proper evaluation on site plus a conversation with the permitting authority about what they will accept. We would rather look at it than guess.

Reviewed August 2026. Links go to the sources this answer was checked against.