Communities in This Region
New Shoreham / Block Island
A Freshwater Lens Surrounded by Saltwater
USGS describes Block Island groundwater as a freshwater lens overlying saltwater. Heavy groundwater withdrawals can increase the risk of salty water entering a well.
Private-Well Questions
Private-well owners can pay particular attention to chloride, sodium, conductivity, iron, pH, bacteria/nitrate and meaningful changes in taste after drought or heavy seasonal demand.
Block Island Public Water
The Block Island Water Company publishes an annual Consumer Confidence Report and current system information. Public-water customers should use those current documents as their starting point.
Island-Specific Approach
Island geology makes source protection and changes in groundwater chemistry especially important. Regional facts guide questions; testing the actual property guides treatment.