With many stormwater controls being implemented on private land, property owners should be aware of long-term operation and maintenance and associated costs. The Stormwater Equipment Manufacturers Association recently released a draft maintenance agreement that can be used by state and local governments to require property developers or owners to perform routine maintenance of stormwater controls. Also included in this document is guidance on additional items to include in the operation and maintenance agreement, such as a long-term maintenance plan written by a design engineer and a map of the stormwater controls. Finally, the document contains guidance on the frequency of monitoring and maintenance for various stormwater controls.