A manganese notice was sent to customers whose water may exceed the new Ct Department of Public Health Action Level of 0.03 mg/l to ensure protection against manganese toxicity. This AL is consistent with the United States Environmental Protection Agency (US EPA) lifetime health advisory level for manganese in drinking water. The AL is of particular concern to our system because two of our wells, Well #7A and 8 have concentrations above 0.3 mg/L. Fortunately, this affects only a very limited area in our system because our remaining wells have very low or no manganese.
Manganese is a mineral that naturally occurs in rocks and soil and is a normal constituent of the human diet. It exists in well water in Connecticut as a groundwater mineral, but may also be present due to underground pollution sources. Manganese may become noticeable in tap water at concentrations greater than 0.05 milligrams per liter of water (mg/l) by imparting a color, odor, or taste to the water. However, health effects from manganese are not a concern until concentrations are approximately 10 times higher.
The Southington Water Department is in the early stages of planning to provide filtration to remove manganese and improve the aesthetic quality of the water. The filtration project for Well 7A and 8 is estimated to cost $11 million. The Water Department is currently applying to the State Department of Public Health for funding from the Drinking Water State Revolving Fund (DWSRF). When completed, we will meet the new action level requirements for manganese.
If you have an infant less than 1 year old or are currently pregnant, please contact the Southington Water Department for further information.