What type of well is primarily used for monitoring groundwater quality?

The primary purpose of a monitoring well is to gather data about the groundwater quality in a specific area. These wells are designed to observe and measure the level and quality of groundwater over time. Monitoring wells are strategically placed to assess contamination, water level fluctuations, and other hydrological parameters.

Unlike water wells that are used for extracting water for consumption or irrigation, the focus of monitoring wells is solely on data collection and environmental assessment. Test wells and exploratory wells serve different purposes, such as assessing geological formations or determining the viability of a site for future water extraction. Therefore, monitoring wells are specifically tailored for understanding and monitoring the condition of groundwater, making them the correct choice for this question.