Western Water Catchment

The Western Water Catchment is a planning area located in the West Region of Singapore. The planning area borders Tuas and Pioneer to its south, Sungei Kadut, Choa Chu Kang and Tengah to its east, Jurong West to its southeast, Lim Chu Kang to its north and the Straits of Johor to its west. It is the largest planning area by land area, covering nearly a tenth of Singapore Island. It is also one of the two main water catchments in Singapore, the other being Central Water Catchment.

The area currently houses four reservoirs, Tengeh Reservoir, Poyan Reservoir, Murai Reservoir and Sarimbun Reservoir. Part of the Western Water Catchment is also a live-firing area in which it is used by the Singapore Armed Forces for training purposes.

The SAFTI Live Firing Area commenced operations in 1968 and was revamped in 2008, the eastern part began operations in 2002 and has been extended to Lim Chu Kang Tracks 11 and 13.

There are 21 districts in Western Water Catchment. Except for Cleantech, Murai North, Nanyang Bridge, Nanyang Crescent, Nanyang Gateway and part of Peng Kang Hill (NTU), visiting to these districts and unauthorised photography or filming in these districts is not allowed by law. Deadly force may be used against trespassers, security guard or military gate warden will ask trespassers to leave, if not police will be called.

There are seven main military bases in the Western Water Catchment. These include Pasir Laba Camp, Choa Chu Kang Camp at Lorong Danau (where the RSAF's 201 Squadron is based; it has Fighter control, SAM control, Surveillance and ASP), Sungei Gedong Camp (HQ Armour), Kranji Camp II & III, Mowbray Camp (SAF MP Command) and Tengah Air Base. A military aerostat, widely referred to as a blimp locally, is tethered to the ground at Choa Chu Kang Camp as part of testing for use as long-range air defence radar in Singapore. Additionally, there are various live-firing ranges in the Western Water Catchment; these include the Multi-Mission Range Complex, MATADOR Range, M203 Range, several SAFTI ranges and the Poyan 300m Range.

The SAFTI City Urban Training Facility was opened on 19 March 2025. Features do include 3 decommissioned MRT trains, 2 decommissioned buses, 2 decommissioned taxis, offices, hospitals and residential buildings, to simulate homeland operations. The names do include: Kremlin Hotel, Bahtera Hospital, Thousand Oaks Offices, North Oaks Park, Murai Path, Poyan Station, Sarimbun Market, Neo Tiew Ferry Pier and Wrexham Bus Interchange.

Half of the Western Water Catchment lies within the SAFTI Live Firing Area boundary. The boundary is within Bahtera Track, Lim Chu Kang Road, New Lim Chu Kang Road, Jalan Bahar, Nanyang Avenue, Nanyang Crescent, Nanyang Drive, PIE, the production of Singapore Rail Test Centre (SRTC), Singapore Rail Test Centre (SRTC), Tengeh Reservoir and Straits of Johor. A few parts are opened to public for various reasons (e.g. short intersection of Old Choa Chu Kang Road, Pasir Laba Road and the whole of Sungei Gedong Road). The remaining half are still military training areas. Those are the places that have been fenced off:

In the Murai area, there are more military training areas which are the Murai Urban Live Firing Facility (MULFAC), Murai Urban Training Facility (MUTF) and MEXCON. These will be affected under the proposed Lim Chu Kang Road realignment project for the expanded Tengah Air Base, along with the construction of the new SAFTI City. The facility was located within an existing training area in Lim Chu Kang, in the vicinity of Jalan Murai. The MUTF is built to resemble a typical town, and has features such as single-level houses; a commercial district comprising multi-function, multi-storey buildings; a residential district; as well as an industrial district. The MUTF was permanently closed in 26 August 2022 to be given for the construction of the new Lim Chu Kang Road and Tengah Airbase, with training being shifted to SAFTI City. The stretch of Lim Chu Kang Road between Neo Tiew Road and Old Choa Chu Kang Road will be permanently closed and given to make way for an expanded Tengah Air Base.