The Georges River catchment covers an area of approximately 960 square kilometres.
Some 1.2 million people reside in the catchment, making it one of the most highly urbanised catchments in Australia.
Upper Georges River
The Georges River begins near Appin, 60km south-west of Sydney. Approximately 45% of the catchment contains large tracts of natural bushland, most of which is found in the upper subcatchment. As a result, the detrimental affects of urbanisation are not significantly felt in this region and the un-modified state contributes excellent water quality and a diverse range of habitat that supports a rich aquatic ecosystem. However mining and urban run-off around Appin threaten the ecological integrity of the upper catchment. Significant tributaries include O’Hares Creek, Maddens Creek, Illuka Creek and Stokes Creek, all of which drain the Dharawhal Conservation Area and provide the majority of flow to the Georges River.
Mid Georges River
Lower Georges River
The Lower Georges River subcatchment extends from Salt Pan Creek to Taren Point. Many of the tributaries in this reach of the river are highly degraded due to a long history of industrial activity and a high degree of urbanisation, which has resulted in large areas of impervious surfaces causing increased stormwater runoff to enter the river. Urbanisation has also led to a significant loss of vegetation within the subcatchment. However Heathcote Creek and Woronora River, remain in excellent condition due to minimal urbanisation within these subcatchments. The results of ecosystem sampling in these waterways found high levels of diversity, good water quality and intact vegetation communities.