Portland Water Bureau (Portland) is engaged in supply of pure drinking water. It supplies water to Multnomah, Washington and Clackamas counties in Oregon. It supplies water to residential and wholesale customers in an service area of 253 square miles. Portland retail service area includes 143.3 square miles. Portland gets water supply from The Bull run watershed and Columbia south shore well field. The Bull run watershed is a surface water source of water and the Columbia South Shore Well Field is a groundwater source. It owns and operates Water Events Station (WES) a portable water station. Portland has two water reservoirs Mt. Tabor & Washington park storage reservoir and Powell Butte Reservoir. Powell Butte reservoir has 50 million gallon underground water storage capacity. Mt. Tabor & Washington park storage reservoir has 220 million gallons storage capacity.