Pool And Spa Leaks Water loss from a pool normally varies between 1/8" and 1/4" per day due to evaporation, but greater loss indicates a leakage problem. Pool leaks can result from defects in the pool shell or any of the plumbing associated with recirculation, filtration, and spa systems. Water Leaks Through Intrusion, Water intrusion in homes and other structures is the penetration of water...