Rats in apartment buildings: when poorly managed garbage bins let rodents thrive (Creil, summer 2026)

In the Guynemer neighbourhood of Creil (Oise), a scene that has become routine in the middle of summer 2026: residents carrying their bin bags down to a roundabout to protest. The reason? A waste collection point closed for two years and bins that are only emptied on Mondays. In the middle of a heatwave, rats have made themselves at home in cellars, stairwells and even... the building stairs. Le Parisien, on 16 July 2026, reported that one resident saw a rat "climb the staircase of his building like a human." The scene is nothing unusual: in Reims, in Paris, and across the whole of Île-de-France, the same causes produce the same effects. Here is what you need to understand — and what to do.

What is happening in Creil (and elsewhere)

The Guynemer case sums up the mechanics of a rat infestation in collective housing:

• a collection point closed since 2024 for "fire risk", according to landlord Oise Habitat;
• household waste bins overflowing at the foot of buildings between weekly collections;
• a heatwave accelerating the decomposition of waste and the thirst of rodents;
• an urban renewal project (NPNRU) at a standstill for almost a year because of an Enedis transformer issue.

The result: rats — mostly brown rats (Rattus norvegicus), coming from sewers and utility tunnels — climb up through the pipework, find an endless food supply in the waste, and eventually enter the flats through cable ducts, technical shafts and ventilation grates.

"Rats have become our pets" — a Guynemer resident, quoted by Le Parisien, 16 July 2026.

This is not an isolated case. A few weeks earlier, Reims (Croix du Sud district) faced the same alert, with cockroaches, rats and pigeons in the common areas. And in Paris, the infestation of senior residences has confirmed that collective housing has become a major breeding ground.

Why garbage bins attract rats

Rats do not move in at random. They follow three unchanging rules: food, water, shelter. A poorly managed bin room ticks all three boxes.

1. Food accessible 24/7

A torn bin bag, a lidless container, litter on the floor: it is an all-you-can-eat buffet for rats. A single night is enough for the smell to be detected dozens of metres away. Rats communicate through scent trails — once a source is found, the colony settles in.

2. Condensation water and heat

In summer, the fermentation heat inside bins produces moisture. Rats need about 15 ml of water a day and find here a welcome supplement to the pipework, damp cellars and air-conditioning condensates.

3. Dark, quiet shelter

Bin rooms — especially when poorly ventilated and rarely cleaned — offer an ideal shelter: dark, quiet and right next to the technical shafts that serve every floor. The perfect entry point into the flats.

Close-up of a rat, illustrating an infestation fuelled by poorly managed bins

The landlord's responsibility: what the law says

In this type of situation, the same question always comes up: "who is responsible?". The answer is clear.

The landlord is liable for common areas

• Decree n°87-712 and Article 6 of Law n°89-462: the landlord must provide a decent home, free of pests.
• Article L. 1331-26 of the French Public Health Code: in case of unsanitary conditions, the mayor or prefect can order works.
• Decree of 23 July 1986 (collective housing): regular maintenance and disinfection of common areas.

In practice, as soon as a rat is reported in the common parts, it is up to the landlord to act: diagnosis, treatment, securing the bin rooms, installation of professional bait stations and follow-up.

The co-ownership property manager

In a co-ownership, the syndic is the one who instructs a deratisation company on a decision of the council. The cost is split across the common charges (Article 10 of the law of 10 July 1965). A syndic that refuses to act is liable and can be summoned in summary proceedings.

The Regional Health Agency (ARS) as a last resort

If the landlord stays inactive despite repeated reports, tenants or the syndic can refer the matter to the Agence régionale de santé (ARS) or the town hall (local hygiene and health service). In Creil, the "brigade verte" (green squad) handles exactly this type of report — four annual campaigns are scheduled in public spaces.

Pro Deratisation practical tip: every report must be sent by registered letter with acknowledgement of receipt. Without a written trail, the landlord can claim they were never told. A simple phone call is not enough.

To go further on the legal framework, read our full article on mandatory deratisation in co-ownerships and restaurants and our guide on the price of professional deratisation in 2026.

Brown rat on the lookout in a dark environment, typical of a neglected bin room

Warning signs residents should not ignore

In a building, an infestation often starts weeks before a rat is seen. The early signs:

• persistent ammonia smell in the cellar, the car park, the bin room;
• droppings — black rice-grain (mice) or olive-shaped (rats) — along walls and pipes;
• greasy marks along rat runs (walls, pipes);
• scratching noises at night in the partition walls or the false ceiling;
• gnawed bins, torn bags on the floor;
• a rat seen in broad daylight in the hall, the courtyard or the stairs — a sign that the colony is already well established.

Critical alert: a rat observed in broad daylight in a common area means a large colony. You have 48 hours to act, not weeks.

The 6-step action plan (landlords and syndic)

Once the infestation is confirmed, here is the method our technicians follow:

1. Initial diagnosis — locate entry points, identify the species, assess the scale (droppings, marks, damage).
2. Securing the bin room — replace damaged containers, fit tight lids, install raised supports (15–20 cm off the ground), high-pressure clean.
3. Seal every entry point — galvanised mesh on vents, mortar on cracks, steel wool + sealant around pipe entries (a rat squeezes through a 1.5 cm hole).
4. Install secured bait stations by a Certibiocide-certified technician — inaccessible to children and pets, and recorded in a follow-up log.
5. Review the collection frequency — switch from weekly to twice-weekly during the critical period, in coordination with the local authority.
6. Monthly follow-up for at least 6 months — check baits, monitor new entry points, written report.

In the most severe cases, this protocol is supplemented by gas deratisation or multi-catch trapping when baits alone are not enough. To understand why the initial audit phase is essential, re-read our article on why you should call a professional deratisation expert.

What residents can do in the meantime

While waiting for the landlord or the syndic to act, each resident can reduce the risk:

• Never leave bin bags outside outside collection days;
• Put food waste in closed bags, themselves in lidded bins;
• Store food (including pet food) in airtight containers;
• Report every observation to the landlord or the syndic in writing (email kept + registered letter);
• Do not use over-the-counter rodenticides in common areas: this is forbidden without certification, and toxic for children, cats and dogs.

For an overview of rat biology and how they spread in cities, also read our article on why rats proliferate in cities and our mouse prevention guide for autumn, which applies year-round to older buildings.

Emergencies and costs: what to expect

A professional deratisation in collective housing (block of flats, co-ownership) generally costs between €350 and €900 for the initial intervention, with monthly follow-up at €80–€150 per visit. The price depends on the size of the building, the scale of the infestation and the chosen protocol (baiting, trapping, gas).

In an emergency (rat seen in broad daylight, food contamination, presence in a professional kitchen), Pro Deratisation operates across the whole of Île-de-France — including Oise — within 24 hours, including weekends.

Request a free quote | 24/7 emergency deratisation | See our pricing

In short

Rats in apartment buildings are not inevitable — they are the mechanical result of poor waste management. As long as bin bags are left outside for days in the middle of summer, as long as bin rooms are not secured and entry points are not sealed, the infestation can only get worse.

In Creil as elsewhere, the responsibility lies first with the landlord and the syndic: it is their legal duty, it is their sanitary emergency. When they delay, residents are not powerless: registered letter, referral to the ARS, and a certified professional for a fact-based diagnosis.

Pro Deratisation supports social landlords, co-ownership managers and individuals across Île-de-France — diagnosis, treatment, follow-up and advice. If you spot rats in your building, do not let the summer turn your block into a colony: contact us today.

Request a quote | Emergency deratisation | See our pricing