Because why wouldn't you put a giant tub of hydrogen fluoride or a refinery for that matter in the center of a population by the lake? Since it (HF) boils at room temp, you also wonder what happens to the steel in the tank when it's sitting next to a giant explosion? I'm sure they have everything under control though. Technology will save us.

Upon contact with moisture, including tissue, hydrogen fluoride immediately converts to hydrofluoric acid, which is highly corrosive and toxic, and requires immediate medical attention upon exposure. Breathing in hydrogen fluoride can cause death from fluid buildup in the lungs.

Thanks for the warning.