Why Urban Environments Have Become the Perfect Storm for Rat Activity

Rat activity across the UK is no longer just a background pest control issue. As we explored in our previous blog, the data shows a clear rise in rodent activity, with urban areas facing some of the highest levels of pressure.

But the important question is: why? Why are towns and cities becoming such a problem when it comes to rats? And why do so many infestations keep coming back, even after treatment?

The answer is that urban environments now create almost perfect conditions for rats to survive, move, feed and breed. Dense populations, food waste, commercial activity, ageing infrastructure and interconnected drainage systems all work together to create an environment where rats can thrive.

For businesses, landlords, housing providers and property owners, this means rat prevention can no longer be seen as something that only happens after there is a visible problem. It needs to start much earlier — with understanding how rats are moving through the built environment and how they are getting into buildings in the first place.

Why cities are so attractive to rats

Urban areas give them exactly what they need. There is regular food waste from homes, restaurants, supermarkets, takeaways, warehouses and commercial kitchens. There is constant human activity, meaning waste is produced every day. There are also countless hidden routes for rats to move through, including drainage systems, service routes, voids, basements, pipework and shared infrastructure.

This is why rat activity is often concentrated in dense urban locations rather than being spread evenly across the country.

In these areas, several risk factors come together at once:

• High volumes of food waste

• Mixed residential and commercial buildings

• Continuous human activity

• Shared waste and service areas

• Ageing buildings and infrastructure

• Interconnected drainage systems

Individually, each of these factors can increase the risk of rat activity. Together, they create the perfect storm.

Geographic concentration and high-risk areas

Although rat activity is present across the UK, it is not evenly distributed. As mentioned, the highest levels of activity are often found in urban locations where population density, food activity and infrastructure all intersect. These are the places where rats have the greatest opportunity to feed, move and access buildings.

London represents the highest concentration, accounting for approximately 23% of UK rodent infestations, with 76,507 infestations recorded across 20 boroughs between 2023 and mid-2025. Boroughs including Camden, Islington, Brent, Newham and Tower Hamlets consistently report the highest levels of activity.

In the West Midlands, rat activity increased by 16% in 2025 (Rentokil), with Birmingham and surrounding areas showing sustained pressure. Walsall alone has over 2,300 registered food businesses, increasing exposure within a concentrated area.

The North West recorded the highest growth, with rat activity increasing by 19% in 2025 (Rentokil) and approximately 95,000 infestations between 2023 and 2025, particularly across Liverpool and Manchester.

In Scotland, Glasgow recorded 10,323 infestations in 2022, a 31% year-on-year increase, with activity concentrated in areas such as Pollokshields and Shawlands.

In Wales, while national datasets are more limited, regional reporting consistently identifies Cardiff, Swansea and Newport as key urban hotspots, with recurring infestations and increasing environmental health concerns. While less formally quantified, these patterns mirror those seen in larger UK cities.

Across all regions, high-risk areas share common characteristics:

• Dense populations

• High concentrations of food businesses

• Mixed-use environments

• Ageing, interconnected drainage infrastructure 

Why commercial and food-led environments are especially exposed

Food-led environments are particularly vulnerable because they often provide rats with both attraction and opportunity.

Restaurants, supermarkets, food production sites, retail parks, hospitality venues and shared commercial premises all have regular food deliveries, storage areas, waste disposal points and drainage infrastructure. If access is not properly controlled, these areas can quickly become high-risk.

For businesses, this is not just unpleasant. It can become a serious operational and compliance issue.

A rat problem can lead to failed inspections, temporary closures, hygiene rating issues, reputational damage, customer complaints and financial loss. For housing providers and landlords, repeated infestations can also lead to tenant complaints and wider property management issues.

This is why prevention is so important. Once rats are inside a building, the problem has already reached a more serious stage.

How rats enter buildings through drainage systems

When people think about rats entering a building, they often think about gaps under doors, holes in walls or waste being left outside. Those things can all play a part, but in many urban environments, one of the most important routes is far less visible.

The drainage system.

Rats are extremely well adapted to sewer environments. They can travel through underground pipe networks, navigate complex drainage systems and move between buildings through interconnected infrastructure.

In dense towns and cities, drainage systems can act as hidden highways. They allow rats to move beneath streets, between properties and towards buildings without being seen.

The problem occurs when there is a point of weakness in the drainage system. This could include damaged pipes, unsealed pipework, faulty drainage connections, redundant pipe openings or defective chambers. Once a route is available, rats can move from the sewer system into the building.

This is why drainage is such a critical part of the problem.

A business may only see the rat once it has entered the premises, but the access route may begin much further away within the wider drainage network. In shared urban environments, this can make the problem more complex, especially where multiple buildings are connected to the same or neighbouring systems.

Why some rat problems keep coming back

Traditional pest control is often very effective at reducing visible activity. It can remove rats from a building, reduce numbers and help bring an immediate situation under control.

But if rats are entering through the drainage system, treatment alone may not solve the underlying issue. This is where many businesses and property owners get stuck in a frustrating cycle.

Rats appear inside the building.

Treatment is carried out.

Activity reduces.

But the drainage access point remains open.

Over time, rats are able to re-enter through the same route and the problem returns.

In many cases, the issue is not that pest control has failed. It is that the building has not been properly protected against re-entry. This is why it is so important to look beyond the visible infestation and consider how rats are gaining access in the first place.

Why drainage-based prevention matters

As rat activity continues to rise in urban environments, there is growing recognition that reactive pest control alone is not enough. Treatment still has an important role to play, especially when there is an active infestation. But long-term protection depends on controlling the points of entry.

Where drainage systems are involved, this means stopping rats from being able to travel up through pipework and enter the property.

Physical prevention within the drainage system can help address the root of the problem. Rather than repeatedly treating the infestation after rats have entered, it helps reduce the opportunity for them to get in at all.

This is where RatGate is designed to help.

A RatGate device is fitted within the drainage system to create a physical barrier that helps prevent rats from travelling upstream into a property, while still allowing wastewater to flow as normal.

For commercial premises, food-led environments, housing providers, landlords and multi-site estates, this kind of infrastructure-led prevention is becoming increasingly important.

Prevention is becoming more important than reaction

Urban environments have become the perfect storm for rat activity because they bring together everything rats need: food, shelter, movement routes and access. But while the problem is growing, it is not impossible to manage.

The key is to stop looking at rat activity as only an internal pest control issue. In many cases, rats are not simply appearing inside a building by chance. They are entering through the hidden infrastructure that connects our towns, cities and commercial environments. That is why drainage should be a key part of the conversation.

By identifying and controlling entry points within the drainage system, businesses and property owners can take a more preventative approach — one that focuses on stopping access at source, rather than repeatedly dealing with the consequences after rats have already entered.

The future of rat control is not just about removing rats once they are inside. It is about stopping them from getting in.