The waterways and estauries of Western Australia are monitored extensively by the Western Australian State Government. For the Swan-Canning estuary the data is available to the general public and may be accessed from:
The data includes physical, chemical and biological properties of water, including salinity, oxygen, nutrients and algae. Most data has been collected regularly (e.g. weekly) since 1995. Other data has also been collected on ecological character of the system by researchers within State Government and local Universities. Many other datasets have also been collected prior to this, or in parallel.