What is a man-made pool used for storing drinking water called?

A man-made pool used for storing drinking water is called a reservoir. Reservoirs are specifically designed to collect and hold water, often created by damming rivers or streams to ensure a reliable supply for various uses, including public water supply, agricultural irrigation, and recreational activities. They play a crucial role in water management systems, helping to regulate water flow and provide a consistent source of water that can be treated and delivered for human consumption.

The other options do not accurately describe this function. Tanks are usually smaller, contained storage units for liquids, often found in homes or smaller facilities. Wells are typically underground sources of water accessed by drilling or digging, not man-made pools. An artifact refers to an object made by humans, but it does not pertain to water storage. Therefore, reservoirs are the best fit for the definition provided in the question.