A dry hydrant provides access to a __________.

A dry hydrant provides access to a static water source, which refers to a body of water that is typically not under pressure and can include lakes, ponds, or reservoirs. This type of hydrant is designed to help firefighters access these water sources quickly and efficiently during firefighting operations. By connecting to these static water sources, firefighters can draw large volumes of water for suppression efforts when no pressurized water supply is available in the vicinity.

In contrast, a pressurized water source refers to systems like municipal water mains, which do not utilize dry hydrants for access. Mains are connected to pressurized systems and provide water in a manner that is not reliant on gravity as in static sources. A water treatment facility is also unrelated, as it focuses on the processing and purification of water rather than serving as a firefighting water supply source directly.