Terms, defined.

For purposes of the Wellhead Protection Area Act: (1) Controlling entity means a city, a village, a natural resources district, a rural water district, any other entity, including, but not limited to, a privately owned public water supply system, or any combination thereof operating under an agreement pursuant to the Interlocal Cooperation Act or the Joint Public Agency Act that operates a public water supply system; (2) Department means the Department of Water, Energy, and Environment; (3) Director means the Director of Water, Energy, and Environment; and (4) Wellhead protection area means the surface and subsurface area surrounding a water well or well field, supplying a public water system, through which contaminants are reasonably likely to move toward and reach such water well or well field.