Nope on Monmouth County. Flushing is not what the fire departments do in our immediate area, except in rare instances. Maybe you are seeing your local FD out on training night running the hydrants. IDK. We don't "check" or flush hydrants. Sure, if one is not working or has an issue, it gets reported to the after the department. Nope, not aware of Chiefs meeting with the water department to ensure it is working. It's a given. As the LA Chief said, when we hook up to a hydrant, we expect it to work. And rewatching the video - she said that she did not know where the water comes from---but I think that refers to which water supply a particular hydrant may be fed from.