Milling There is clear evidence for at least one water mill on the Fleet Brook. Isaac Taylor's map of Hampshire, produced in 1759, names Fleet Mill, Fleet Pond and Fleet Farm, and it was marked as a corn mill in 1872. It continued in use until around 1940, and in 1990, English Heritage inspected it to see whether it should become a listed building, but decided that it did not have sufficient merit. The site is now occupied by office buildings, although a small part of the mill has been incorporated into the design. Water quality The Environment Agency measure water quality of the river systems in England. Each is given an overall ecological status, which may be one of five levels: high, good, moderate, poor and bad. Components used to determine this include biological status, which looks at the quantity and varieties of invertebrates, angiosperms and fish, and chemical status, which compares the concentrations of various chemicals against known safe concentrations. Chemical status is rated good or fail. The water quality of the Fleet Brook was, in 2019: Reasons for the quality being such include: discharge from sewage treatment works; runoff from agricultural land; physical barriers such as weirs and impounding of the water which prevent the free migration of fish and other species; runoff from roads; and leaching from landfill sites. Bibliography References External sources Rivers of Hampshire Loddon catchment