A Dry Well by definition is a drainage structure that leaches rain water from parking lots, roads, buildings, roof water, bridges, or a house roof or driveway into the ground according to source All Storm Drains Inc.. These structures can come in various forms. Dry Wells can consist of precast concrete ring or multiple rings depending on the capacity needed or the depth necessary to reach good sand for sufficient drainage.

Drywells are drains used for stormwater and also laundry water on Long Island. Both are utilized in Nassau County and Suffolk County New York. Laundry systems do not accept stormwater and storm water systems do not accept laundry water. Typically commercial laundromats and homeowners are the only ones who use laundry dry wells. Laundry systems are usually maintained using cesspool trucks. Cleaning these systems with industrial vacuum trucks can be expensive. Typically we treat these like cesspools. However storm water drywells on commercial properties and even larger household systems in driveways or on private roads are cleaned with the industrial vacuum trucks. Typical dry wells can hold 1,500 gallons of water, However commercial application may have as much as 50,000 gallons of water or more!