The Eketahuna pool is out of action after damage caused by the magnitude 6.2 earthquake on Monday.
While the main pool stood its ground, the smaller pool cracked open and the water flooded out quickly, said Ryan Seator, president of the pool committee.
"There's a huge crack in it, a third of the way around the pool, let's say it didn't take long for it to empty."
The main pool was undamaged but foundations in the filter room collapsed.
Some pipes were fine but internal pipes were still to be checked, said Mr Seator.