The State Planning Policy for Healthy Waters aims to better manage stormwater and wastewater from urban development to protect environmental values of waterways by providing guidance for planning instruments, development applications, and design objectives for stormwater quality and flow as well as waste water management. It applies to planning and development involving 2500m2 or more of impervious surface or 6 or more dwellings and seeks to clean up and slow down urban stormwater runoff.