Impacts to Wellfields
A review of the hydrogeology of Delray Beach’s wellfields was conducted, with emphasis on recent trends of water levels and chloride concentrations. Of particular interest, the Eastern Wellfield lies within a relatively short distance to the Intracoastal Waterway and connection to the Atlantic Ocean, a potential source of saltwater into the groundwater environment. The supply wells comprising the Eastern Wellfield draw water from depths of between 40 to 100 feet below land surface, from a shelly sand formation. A series of monitoring wells have been constructed adjacent to and below the supply wells, to observe water levels and the concentration of chloride (salt) within the water. In general, data from the most recent decade of monitoring indicate that water levels and chloride concentrations in the vicinity of the Eastern Wellfield have remained stable, with the exception some isolated, deeper zones within the aquifer. The City has taken a proactive approach to the observed trends of water produced from the supply wells, and have instituted an operational protocol to limit the withdrawal wells that have increasing concentrations of chlorides.