To provide a civil engineering and building material composed of water-granulated blast furnace slag in which fluorine concentration to be eluted satisfies ≤0.8 mg/L based upon a soil environmental quality standard, and to provide its producing method.

The civil engineering and building material is composed of the water-granulated blast furnace slag in which particles having <0.5 mm particle diameter defined by the screening with a 0.5 mm opening mesh are ≤5 mass%. The civil engineering and building material composed of the water-granulated blast furnace slag is directly produced from a molten blast furnace slag by water-granulating the molten slag produced in a blast furnace, and produced by water-granulating the molten blast furnace slag to obtain the water-granulated blast furnace slag and removing at least a part of the particles having <0.5 mm particle diameter.