The Western Water Catchment currently houses four reservoirs, Tengeh Reservoir, Poyan Reservoir, Murai Reservoir and Sarimbun Reservoir. The Western Water Catchment is also a live-firing area in which it is used by the Singapore Armed Forces for training purposes. It is also a restricted area in which it is out of bound to all members in the public except for military personnel from Pasir Laba Camp (South) and Sungei Gedong Camp (North).
The SAFTI Live Firing Area commenced operations in 1968 and was revamped in 2008, the eastern part was started in 2002 had been extended to Lim Chu Kang Tracks 11 and 13, but it has been unnamed, could be named 'Murai North'.
In future, it will be redeveloped into HDB estate cum forest park/Green Corridor, replacing Pulau Tekong as it is still for military use (Post 2020/30 Plans). There are many common names in Western Water Catchment, this includes Bajau, Elephant Hill, Pasir Laba, Poyan, Murai, Sungei Gedong, Poyan North, Wrexham and Sarimbun.