The Department of Water operates numerous surface water and groundwater monitoring sites throughout Western Australia and collects data on the quality and quantity of the State's water resources. The information, which includes surface water levels, flows and quality, and groundwater levels and quality, contributes to our understanding of the nature of the State's water resources, their fluctuations, and their response to changing climate and human pressures. This understanding allows us to make informed decisions, provide useful advice, and manage and plan effectively for safe and sustainable water supplies. A summary of Water Resources Data for many monitoring sites throughout the state is available via this link. The reports are updated frequently and the data is generally current to within the last 12 months. Sites on the Rainfall Sites, Streamflow Sites and Groundwater Sites pages are listed by Site Number. To find a site by name simply click on the links below. If you require data other than that available from the Rainfall Sites or Streamflow Sites pages please use the Water Resources Information Catalogue to select the sites and data in which you are interested and send us a Data Request using the Data Request email address: Water Information Officer. A link to this can be accessed via the WA Water Resources Data (WRDATA) Homepage link below.