Lake Quannapowitt (KWAN-ah-POW-it), which was originally known as Reading Pond, has numerous nicknames today. Some area natives refer to the lake as "Lake Quannapolluted" due to their view of the state of health of the lake, but the Massachusetts Department of Environmental Protection handled only one isolated open case of contamination from the electric company that was remediated in 2008. The two former beaches remain closed to swimming, due to arsenic which was introduced into the lake in the early 1960s to deal with aquatic weeds.