Which agency's data may be used to support claims regarding aquifer usability?

The United States Geological Survey (USGS) is a vital agency when it comes to issues related to hydrology, including aquifer usability. The USGS has extensive data on groundwater resources, aquifer characteristics, water quality, and water availability. Their research and data collections are critical for understanding the viability of aquifers as a resource, which is important for claims regarding their usability.

Additionally, the USGS conducts national assessments and provides a wealth of scientific information that can support management decisions and regulatory compliance concerning water resources. This makes their data particularly valuable in evaluating and justifying claims about aquifer usability in various contexts.

While other agencies listed may possess relevant information, the specificity and comprehensive nature of the data provided by the USGS make it particularly suited for this purpose. For example, while the Environmental Protection Agency (EPA) focuses on enforcing regulations for environmental protection including water standards, and the Oregon Department of Environmental Quality (DEQ) addresses environmental issues within the state, it may not provide the same breadth of groundwater-specific data as the USGS. The California Water Resources Department is focused on water management in California and may not be applicable for evaluating aquifer usability in other states, such as Oregon. Thus, the USGS is the best choice