Main Drain Leak Repair

The main drain assembly at the bottom of your pool is a critical hydraulic component — but it's also a common and often-missed leak location. The drain cover gasket, sump housing, and the plumbing pipe transitioning through the shell floor can all develop leaks that are invisible from the pool deck. Because the main drain is submerged at the deepest point of the pool, confirming a leak there requires specific underwater inspection techniques including dye testing and, in some cases, camera inspection of the pipe interior. Woodland Hills Pool Repair & Replaster is equipped to diagnose and repair main drain leaks with minimal disruption.

Many main drain leaks originate at the gasket between the drain cover and the sump, or at the threaded connection where the pipe collar meets the sump body. In these cases, a diver or technician working from the pool floor can reseat the cover with a new gasket and stainless hardware without draining the pool entirely. When the leak source is in the plumbing pipe below the floor slab, pressure testing isolates the line and targeted excavation allows pipe replacement or epoxy lining injection to restore the seal.

Modern code requirements also affect main drain work — drain covers must meet anti-entrapment standards, and any cover replacement we perform uses current compliant hardware. Woodland Hills Pool Repair & Replaster keeps current drain cover inventory on hand for the most common residential pool configurations.