By Miriam Raftery
August 19,2016 (San Diego’s East County) – State and local water agency representatives have offered more information for the public following a recent report revealing that 150 reservoirs statewide are “mercury impaired,” including10 in San Diego County, as ECM reported.
A key clarification is that the term “mercury impaired reservoirs” referred to testing of fish in those waters, not testing of water for drinking. Drinking water can test with no detectable mercury levels, yet still have high, unsafe concentrations of mercury in fish, particularly larger fish that have consumed smaller fish. This problem raises a new issue: the need for new testing methods to detect low levels of mercury that while not unsafe in drinking water, can result in unsafe levels in fish living in those waters.