Sampling wells are specialized structures used to collect water samples from underground sources, such as aquifers. They are designed to provide access to groundwater for testing its quality and composition. By extracting water from these wells, scientists and environmentalists can monitor for contaminants and assess the health of the water supply. These wells typically consist of a casing that extends into the ground, with a screened section that allows water to flow in while filtering out larger particles. Sampling wells are crucial for managing water resources and ensuring safe drinking water, making them important tools in environmental science and public health.