What is the purpose of a sampling faucet in public wells?

A sampling faucet in public wells is specifically designed to collect water samples for testing and analysis. This is crucial for monitoring the water quality and ensuring that it meets safety standards and regulations. The design of the sampling faucet allows for easy access to fresh water that has not been stagnant, which is important for obtaining accurate and representative samples.

The other purposes mentioned, such as draining excess water, controlling water flow, or adjusting water temperature, do not align with the function of a sampling faucet. These aspects are generally managed through different equipment or mechanisms within the water distribution system, which are designed for those specific tasks rather than for sampling purposes.