A new study from the University of Minnesota evaluated 25 highway rest areas as their septic tanks were being maintained during a normal maintenance visit. The water use at rest areas and travel information centers is known to vary from typical residential usage, since it is produced almost entirely by toilet-flushing and hand-washing.
Flow estimates for most of these systems was based on a study conducted by the Minnesota Department of Transportation, which collected data at rest areas for design of water supply and sewage treatment. They found on average that with water-conserving devices people used 2.8 gallons, while devices that
