Some Ellington, South Windsor and Vernon customers have called to ask about a musty, earthy taste and smell to their water. The water being delivered to customers meets all drinking water standards.
Higher than average rainfall this summer has caused an increase in natural organic matter present in Shenipsit Lake Reservoir, and other reservoirs across the northeast United States, which has increased the presence of two naturally occurring compounds, Geosmin and Methyl-Isoborneol (MIB). These compounds are byproducts of organisms that live in surface water and they can significantly increase under conditions such as those we’ve recently experienced.
The water from Lake Shenipsit is filtered and treated to ensure that the water delivered to you meets all State and Federal drinking water standards. The treatment process brings Geosmin and MIB to extremely low levels, however, even at low levels, such as 5 parts per trillion, these compounds can be tasted and produce a musty smell. 5 parts per trillion is equivalent to five drops of water in an Olympic-sized swimming pool.
Test conducted over the past week show the levels of Geosmin and MIB are decreasing. The return of cold weather will also help resolve the taste and odor issue. CT Water continues to test for these and other compounds, as well as a variety of organisms to evaluate whether there is anything harmful in the water.