Disclosed are various embodiments of a lockable toilet fill valve and methods according to the present invention. In one embodiment, a toilet fill valve includes a float/arm assembly. The toilet fill valve is closed when the float/arm assembly is disposed in a first position. The toilet fill valve being open when the float/arm assembly is disposed in a second position. A valve lock is associated with the float/arm assembly. The valve lock includes an unlock position and a lock position, wherein the valve lock fixes the float/arm assembly in the first position when the valve lock is in the lock position.