In keeping with federal and state requirements, Concord tests its drinking water for all regulated substances. One of these substances, bromate, is regulated with a maximum contaminant level (MCL) of 10 parts per billion (10 ppb), averaged over any 12-month period. The average of the samples of drinking water supplied from Nagog Pond during the months of June to August 2020 was just less than 11 ppb, and because of this, we sent out a Public Notice. Public notice regarding bromate was previously distributed in the fall of 2019, as well as in the spring of 2020 (linked below). However, because Nagog Pond is just one of seven water sources used by Concord and only supplies drinking water during the summer months, the 12-month average concentration of bromate in Concord’s drinking water is about 4 parts per billion (4 ppb), which is well within the allowable limit.