- The number of private wells with arsenic or uranium concentrations that are greater than the current drinking water standards.
- The degree to which bedrock units correlate with concentrations of uranium and arsenic.
Public wells are relatively uncommon in bedrock because of low water yield; however, private bedrock wells are very common and results could substantially increase knowledge about arsenic and uranium distribution.
Residents with private wells in the Massachusetts’ counties Essex, Middlesex, and Worcester are needed for this study. In early March, some 1,600 residents will receive letters asking them to help scientists determine if arsenic or uranium concentrations are elevated in their well water.
The letters will come from the U.S. Geological Survey, and instructions and sampling kits will be provided; there is no cost to participate. Following the study, well owners will receive confidential results of the tests.