Today’s fascinating P/S industry image comes from P.K. Data, constructed using information from two recent studies on the U.S. pool market.

Imagine a picture of the United States from low earth orbit using a special camera which could filter for backyard swimming pools. It would look quite a bit like this:

photo of U.S. map showing areas where backyard swimming pools are prominent

According to P.K. Data research, there are five million inground residential swimming pools in the U.S. Over 40 percent of them are in two states, California and Florida. What’s more, an equal proportion of all new pools built in 2012 were in those same two states.

If the Boston-Washington DC corridor was a state, it would be the third most pool-populous, with just under 8 percent of inground pools, followed closely by Texas and Arizona. Nothing else comes close, but there are perhaps surprising concentrations in the upper Midwest near Chicago, Cincinnati, Cleveland and Detroit.