Western Water Catchment, Singapore

The Western Water Catchment Planning Area (Simplified Chinese: 西部集水区, Traditional Chinese: 西部集水區, Pinyin: Xībù Jíshuǐqū, Malay: Kawasan Tadahan Air Barat, Tamil: மேற்குப் நீர்ப்பிடிப்பு) is a large planning area in the West Region of Singapore. Covering around 37.0 square kilometres, it is one of the biggest planning areas in the country. As its name suggests, the zone is primarily reserved for reservoirs and water catchment purposes, as well as serving as an important military training area for the Singapore Armed Forces (SAF). Due to these functions, public access is highly restricted.

History of the Western Water Catchment

Before development, the Western Water Catchment area was covered with dense secondary forests and wetlands. In the late 20th century, parts of the land were set aside for reservoir creation and military training grounds. Unlike residential towns, this planning area has never been intended for large-scale civilian habitation, reflecting Singapore’s long-term strategy of balancing water security, defence, and controlled land use.

Geography and Boundaries

The Western Water Catchment lies west of the Central Water Catchment and north of the Western Islands. It is bordered by Sungei Kadut to the northeast, Lim Chu Kang to the north, and Tengah to the east. The area is mostly undeveloped, with large tracts of greenery and forest cover, as well as reservoirs such as the Murai Reservoir and Sarimbun Reservoir.

Subzones of the Western Water Catchment

Reservoirs and Water Role

The Western Water Catchment plays a critical role in Singapore’s “Four National Taps” water strategy. Its reservoirs help to store rainwater and channel it into the national supply system. The area’s low human activity and controlled land use ensure minimal pollution and high-quality water collection.

Military Training Grounds

Much of the planning area is used as a training ground by the Singapore Armed Forces. The SAF’s Live Firing Areas (LFAs) are located here, where military exercises and weapons testing take place. Because of this, the public is not allowed to enter during live firing periods, and warning signs are prominently displayed around access points. The restricted use of the land has, paradoxically, helped conserve its natural environment.

Biodiversity and Nature

Despite its role as a water catchment and military zone, the Western Water Catchment has patches of rich biodiversity. Limited studies and observations have revealed the presence of freshwater habitats, forest species, and birdlife. Access restrictions have indirectly preserved much of the natural greenery from urban encroachment.

Transport and Connectivity

The Western Water Catchment is not served by MRT stations or bus routes. Roads in the area are primarily used for military and service access. Nearby towns such as Choa Chu Kang, Jurong West, and Lim Chu Kang are the nearest civilian settlements from which the area can be reached, though entry is controlled.

Residential Aspect

There is no residential housing within the Western Water Catchment. Workers, military personnel, and contractors commute from other parts of Singapore. Real estate markets are therefore unrelated to this planning area.

Fun Facts about the Western Water Catchment

It is one of the largest planning areas in Singapore but has no residents.
The SAF Live Firing Areas here are off-limits to the public during exercises.
Its reservoirs form an integral part of Singapore’s water supply system.
Restricted access has helped conserve its forests and wetlands.
Some of the least disturbed natural habitats in Singapore are found here.

Map of Western Water Catchment, Singapore

Quick Facts

Total Area: ~37.0 sq km
Region: West Region
Population: None (restricted military and water catchment use)
Known for: Reservoirs, SAF live firing grounds, water catchment role
MRT: None (nearest towns: Choa Chu Kang, Jurong West, Lim Chu Kang)
Postal District: District 22

References

Page Details

This page was created on 9 September 2025. Hi, my name is Timothy and created it from my research, for my own entertainment, knowledge and to satisfy my curiosity. I am providing the information to you in good faith and hope it is useful. I try to get the details as accurate as possible. I also try to update the page whenever I stumble on new details. So this and all my other pages are perpetual work in progress. If you discover any error, please politely inform me, pointing out where the error lies, and I will correct it as soon as possible. Your helpfulness will keep this page accurate, relevant and helpful to those who need the information.

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