In the United States the vast majority of lap pools are 25 yards. For club, high school, and collegiate swimming 25 yard pools are also the standard and most li

In the United States the vast majority of lap pools are 25 yards. For club, high school, and collegiate swimming 25 yard pools are also the standard and most likely won’t change anytime soon - it’s one thing to adjust a track to run meters versus yards but there are thousands of already built pools that can’t be “extended”. Having said that, it’s not hard to find a long course (50m) or short course (25m) pool either as all international records and competition are held in those formats. Usually a 50m pool with either have a movable bulkhead that can dynamically be adjusted for a specific length, or also common is a 50mx25yd length to be able to have two options.