That is a great question for a pool installer or pool cleaner. The higher the house price the more likely you are to see a swimming pool. Also, swimming pools are permitted and listed on the tax record in the luxury home market. You could look at the tax record. Just based on showing homes in South Mecklenburg, I would guess about 10% or less of the market have swimming pools. If you know any airline pilots they may have a feel for that. When you fly over Dallas, the number of people with swimming pools is overwhelming. Your realtor can search an area for you to find a house with a pool.