Singapore is, by almost any measure, one of the cleanest and most efficiently managed cities in the world. Its streets are swept, its public spaces maintained, its infrastructure meticulously planned. And yet, in the gaps between all of that order, beneath the hawker centres, along the construction hoardings, inside the drains running under some of the city's most manicured neighbourhoods, rats are doing very well for themselves.
The brown rat, the house mouse and the black rat, are not new arrivals to Singapore. They have been here as long as there have been cities to live in. But urban growth, changing construction patterns, and the particular rhythms of Singaporean food culture have created conditions in which controlling their populations has become an increasingly complex challenge. Dr. Foo, whose work in urban pest management spans decades, is candid about why.
This kind of adaptive behaviour is what makes rodent management so much harder than it might appear from the outside. Traditional trapping and baiting relies, to some extent, on rats behaving predictably. Experienced urban rats often don't. They learn, they avoid, and they find new routes through a building's infrastructure that inspectors haven't yet considered.
And buildings, it turns out, give them plenty of options.
The maze above our head
When Dr. Foo begins a rodent inspection, she typically starts with the ceiling, and what she finds there is often revelatory. Modern commercial buildings are threaded with a hidden world of service lines, piping, electrical wiring, and ventilation ducting that creates an intricate maze above the level that most people ever look at. For a rodent, this is a navigable highway system. For an inspector, it is an obstruction course that makes it genuinely difficult to trace where an infestation is rooted or how far it has spread.
This architectural complexity is one reason why achieving a "zero rodent count" in a large commercial building is so persistently difficult. You can treat what you can see and reach. What lives inside the maze is another matter.
The physical capabilities of these animals compound the problem considerably. Rodents can enter through very small gaps, typically as narrow as 6 mm in diameter. Owing to their flexible body structure, they are able to pass through openings as long as the head can fit through. In a building with aging infrastructure, poorly sealed pipe penetrations, gaps around air conditioning units, or any of the dozens of small imperfections that accumulate over years of use, the entry points are effectively everywhere.
The reproduction mathematics make this more alarming still. A single pair of house mice has the potential to produce hundreds to thousands of offspring within a year under favourable conditions, highlighting the importance of early intervention. What begins as a small, overlooked gap in a wall can become, with the right conditions and enough time, something considerably harder to manage.
The public disconnect
Dr. Foo has observed a striking inconsistency in how Singaporeans respond to rat sightings depending on where they occur. Spot a rat in an upscale shopping mall and the reaction is horror. Spot the same rat in a neighbourhood hawker centre and the reaction is frequently a shrug, a common occurrence, unfortunate but unsurprising.
Dr. Foo pushes back on this firmly. It is not normal to see rats anywhere. The tolerance that exists in some settings and not others is itself part of the problem, and closing that gap starts with public knowledge: understanding what attracts rats, what sustains their populations, and what small behavioural changes can make a real difference.
"Everyone needs to work hand in hand," she says. "The public provides the food, the water, and the shelter that rodents need to thrive. Without addressing that, professional pest management can only do so much."
SMART Thinking
Intelligent 24/7 monitoring sensors, which detect activity in real time and generate actionable data, represent a significant improvement over traditional trapping methods that experienced rats frequently learn to avoid. The key, as with termite monitoring, is not simply installing the technology but acting on what it tells you.
Collaboration
Professional pest management and public sanitation are not alternatives; they are partners. Rigorous housekeeping, proper food waste disposal, and community awareness of what attracts rodents are the foundation without which any professional intervention is temporary at best.
Construction: a city in constant motion
One further factor deserves attention. Singapore's construction sector is among the most active in the region, with major infrastructure projects and urban renewal programmes running continuously. Each project disrupts the ground, causing the rat populations living in and around construction sites to move, dispersing into surrounding streets, food establishments, and drainage systems.
Reducing and monitoring the population in surrounding areas before, during and after the build can manage this displacement significantly. But it requires developers and contractors to treat pest management as a genuine planning consideration rather than an afterthought. A shift in thinking that Dr. Foo acknowledges is still a work in progress.
Singapore's rats are not going anywhere. But with smarter monitoring, more rigorous food waste management, proper structural proofing, and a public that understands its own role in the problem, the balance can shift.
As Dr. Foo would put it: the earlier you start, the better your chances.
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