Poor drainage, large trees and landscaping planted close to these walls causes soil erosion, which can cause real problems with a block masonry wall. These issues are not exclusive to Boulder City, I have seen this in other cities like Las Vegas and Henderson. A Boulder City home inspection will include information that will help you to avoid problems, not just report on the current problems. As a Boulder City home inspector I feel it is incumbent upon me to report maintenance and issues which may appear at a later date. Remember to keep pop-up sprinklers away from the walls and routinely check your drip irrigation for leaks. Also remember to keep trees plantings far enough away in order to prevent the root systems from displacing the wall.