What are the pipes called that deliver water from the treatment facility to the fire hydrants?

The term for pipes that deliver water from a treatment facility to fire hydrants is "water mains." Water mains are the primary infrastructure responsible for transporting potable water to various distribution points within a community, including fire hydrants, which are crucial for firefighting operations. These large-diameter pipes enable efficient distribution and ensure that there is sufficient water flow and pressure available during emergencies.

In contrast, filler pipes typically refer to conduits used for filling containers, not water distribution systems. Re-circulators are generally related to systems that circulate fluids, often seen in heating systems, rather than for hydrant supply. Drain fields are components of septic systems used for wastewater management and have no relation to water distribution for fire protection. Understanding these definitions highlights the importance of water mains in fire service and overall municipal water supply.