Site Alteration protects the Town's roads, ditches, culverts, boulevards and storm water drainage patterns from damages caused by fill that is hauled into and within the Town of Halton Hills boundaries. The Town endeavours to minimize the negative impact that can occur due to the hours of operation and the volume of material that is transported into an area. Owners are encouraged to seek the Town of Halton Hills assistance and expertise before beginning a site alteration to fully understand the scope of work to their properties. Development Engineering 905-873-2600, ext. 2200.