Rats could crawl out of toilets after heavy rains in Washington state

As heavy rain pummels parts of Washington State, residents are seeing more than flooded basements and clogged gutters — unusual sightings of rats emerging from toilets, storm drains and backyard sheds are spiking on social media and in neighborhood reports. The phenomenon is unsettling but rooted in a chain reaction of saturated soil, overwhelmed sewers and rodents looking for dry shelter.

Public works crews and pest-control experts say these encounters are most common during prolonged downpours or rapid snowmelt, when underground tunnels and sewer lines flood. Understanding why this happens and how to respond can help homeowners protect their families and properties without panicking.

Why heavy rain pushes rodents into homes and toilets

Rats are burrowing animals that live in networks beneath the ground and around foundations. When intense rain fills their tunnels and sewer channels, these animals will naturally seek higher, drier ground — sometimes guided into basements, crawlspaces and even plumbing fixtures. Sewer backups and stormwater infiltration are the two main drivers that move rodents from outdoor burrows into human-occupied spaces.

How sewer systems become pathways

Most urban sewer systems combine stormwater and sewage or run close enough that excessive water can overwhelm one or both. When pressure builds, flow can reverse or spill into lateral pipes and home service lines. The result:

• Blocked or surcharged pipes force water — and whatever is riding in it — up through floor drains and toilets.
• Manholes and catch basins may overflow, depositing debris and displaced animals near building entrances.
• Cracks in aging pipes become exit points for rats pushed by rising water.

Behavioral drivers: where rats look for shelter

Flooded burrows, food scarcity and the instinct to avoid drowning push rats into structures. They are opportunistic, excellent climbers and can squeeze through surprisingly small openings. Toilets and floor drains provide a direct route from sewer systems into homes, which is why sightings in bathrooms spike after storms.

Where sightings have clustered in Washington and why urban centers are vulnerable

Reports tend to concentrate in dense urban and older residential neighborhoods with combined sewers or aging infrastructure. Cities with older pipe networks, low-lying neighborhoods and areas near rivers or shorelines face higher risk during heavy precipitation. Localized flooding patterns also make some neighborhoods more prone to sewer backflow than others.

• Areas with older combined sewer systems are more likely to experience pressure-related backflow.
• Neighborhoods with poor surface drainage or blocked storm drains see more standing water that displaces burrows.
• Homes with cracked foundations, gaps around sewer lines, or neglected vent pipes offer easy entry.

Immediate safety steps to take if you see a rat in your toilet or drain

If you encounter a rodent in a toilet, sink or drain, keep calm and follow basic safety precautions to reduce health and safety risks.

• Close the toilet or drain cover to prevent the animal from escaping into living spaces.
• Avoid direct contact. Rats can carry pathogens; do not handle them with bare hands.
• Ventilate the area if possible and avoid flushing the animal — flushing could injure plumbing or spread contamination.
• Notify your landlord, building manager or local public works department if the issue appears to be part of a wider sewer problem.

Home protection: practical upgrades and routine maintenance

Reducing the chances of sewer-stage intrusion and rat entry relies on both one-time upgrades and ongoing maintenance. Many of these measures cut flood risk as well as pest problems.

• Install a backwater valve or sewer backflow preventer to stop sewage — and critters — from coming back into the house during heavy flows.
• Seal gaps where pipes enter the foundation and repair cracked concrete or masonry to block entry points.
• Keep storm drains and gutter downspouts clear of debris so water drains away from your home.
• Maintain landscaping by removing dense ground cover and woodpiles near foundations that attract rodents.
• Schedule regular inspections of sewer laterals, especially in older homes; video camera surveys can detect cracks and root intrusions early.

When to call professionals: public works, plumbers and pest control

Different problems require different responders. If you suspect a system-wide sewer issue, contact your municipal public works or utilities department. For single-house backups or visible rodents inside the home, licensed plumbers and professional pest-control technicians can assess and fix the problem.

• Public works: coordinates street-level drainage response, inspects city mains, and issues boil-water or safety advisories when necessary.
• Plumbers: clear blockages, install backflow devices, and perform sewer camera inspections of private laterals.
• Pest-control pros: set traps, rodent-proof entry points, and recommend sanitation measures to deter reinfestation.

What to expect from professionals

Pest control or plumbing teams typically begin with an inspection to identify entry points and the scope of the infestation. Remediation may include trapping or baiting, sealing gaps, disinfecting contaminated areas and coordinating with utilities to repair compromised public mains. Rapid response reduces contamination risk and property damage.

Health risks and cleanup guidelines after rodent exposure

Contact with rat urine, droppings or saliva can spread diseases and trigger allergic reactions. If an area has been exposed, follow CDC-style cleanup recommendations: ventilate the space, use gloves and masks, disinfect surfaces with appropriate cleaning solutions, and safely dispose of contaminated materials. For significant contamination, hire professionals who specialize in biohazard cleanup.

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William Anderson

William Anderson is a multimedia producer specializing in videos, podcasts, and interactive galleries. With five years of immersive content creation, he turns information into a rich audio‑visual experience. His storytelling skills draw you directly into the heart of every story, on any platform.