The Arrowsmith Groundwater Area covers approximately 10,300 km2 and produces ~151 million m3 of available groundwater per year. The largest aquifers occur in the Yarragadee and Parmelia formations and recharge primarily from rainfall recharge. The Superficial formation is an important resource near the coast. Water quality is variable. The Allanooka borefield, 50km  south of Geraldton, supplies the integrated water scheme for Geraldton and Dongara/Port Denison.