Most property managers ask the same question sooner or later. How often should stormwater facilities such as ponds, basins, and drains be checked? The honest answer is that it depends. Stormwater inspection frequency changes with the type of facility. It also changes with local rules, the age of the system, and how the site is used. One simple rule will not fit every property with stormwater facilities. This guide explains why timing varies for stormwater facilities. It also