North Bay, East Bay, Peninsula
3030 Ashby Ave #103B, Berkeley, CA 94705
San Francisco to Daly City
1390 Market St., #200, San Francisco, CA 94102

Pro Tips & Advice

Know what you’re up against when it comes to rodents.

Alley Cat Pro Rodent Control Quick Guide

Attracting Rodents?

How Rodents Thrive

Hidden Costs & Health Risks

Keeping Them Away

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Table of Contents

This page provides valuable insights into the behaviors, risks, and signs of rodents, helping you make informed decisions to protect your home. From recognizing the first signs of trouble to understanding the broader implications, this information equips you with the knowledge needed to take proactive steps.

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In the last year alone, rodent activity throughout the Bay Area has increased 37% YoY. In fact, over the last decade, it’s gone up:

Rodents are prolific breeders, and if control measures aren’t acted upon, they’ll simply repopulate.

Rodents are also extremely versatile – mice can enter houses through gaps, cracks, and holes that are as small as ¼ inch, which is about the diameter of a #2 pencil. [Rats need roughly ½ in – about the diameter of a AA battery.]

In fact, structural defects are the #1 overall cause of rodent infestations in the US, to which homeowners are:

The other issue is that 52% of homeowners opt for DIY solutions when dealing with rodent problems, despite the following:

Moreover, homeowners who chose DIY methods took 60 days longer on average than professional crews to eliminate the infestation and implement rodent exclusion measures.

On your initial inspection, if you see any cracks, holes, or crevice, fill it in with either dirt/soil or crumpled paper, then return 24 hours later to see if there’s been any change. If it’s been removed, that will tell you it’s an entry point

Rodents are social creatures that live together in large groups. Where you find one rodent, there are likely many more. In rodent infestations specifically, pheromones left behind by previous rodents can attract more rodents to the same area.
Rodents like to build their nests close to their food, such as oak and fruit trees (where acorns, nuts, and fruit drop), so they don’t have to travel far. Usually, rats stay within 150 feet of their nest, and mice stay within 30 feet.

Primary food sources include:

The top 3 controllable factors that can worsen a rodent problem are:

How well you manage these food sources can directly affect how bad a rodent problem might get. For example, seeds from a single gray pine pinecone, an orange, and daily acorn production from a single oak tree can feed:

With plenty of food and shelter, often made worse by trash and messy yards:

Remember—keeping your yard clean and taking care of your trash properly can greatly reduce the chances of having rodent problems.

Rodents pose more than just a nuisance—they can have serious financial and health repercussions. For example:

Around 25% of fires with “unknown causes” annually are likely started by rodents chewing on gas lines, wires, and more, leading to an average repair cost of $20,351.

This happens because rats’ teeth grow 4-5 inches per year and never stop growing. They can chew 6 times per second with a force 12 times stronger than a human bite.

And to manage their teeth length and reduce stress, they chew on pipes, wires, and more, resulting in over $282.85 million in annual property damage in North America.

Rodents do this in two main ways:

This damage often leads to insulation being compacted, destroyed, or removed, which decreases energy efficiency and raises heating and cooling costs. Coincidentally, the price of fiberglass insulation has surged 76% since 2019, making insulation repairs even more expensive.

Rodents can also spread up to 35 diseases to humans through various means, including:

Rodent infestations can be particularly alarming for families with children and pets. Annually, about 27,000 people in the U.S. are bitten by rodents, with half of these cases involving children. Furthermore, half of all mice and one-third of rats carry fleas, which host over 80% of known flea species — posing a serious risk to pets, especially without regular flea medication.
Salmonella is the most widespread disease among rodents, with nearly 50% of all rats carrying it. In fact, a single mouse can introduce 23 million Salmonella bacteria through their droppings in a single day—460 times the human threshold for infection.

This is especially dangerous in poorly ventilated areas with active rodent infestations, which remains the #1 risk factor for infection.

The big takeaway here is the urgency of addressing rodent infestations quickly. Without proper control, rodents not only damage property but also pose serious health risks. Acting quickly to prevent or control these infestations is essential to avoid escalating problems.

While there might be some perceived cost savings, key factors like contamination risks, potential repairs (e.g., wiring, HVAC, insulation), and the time required are often overlooked.

For example, DIY methods often take up to two months, compared to just 4-8 hours for a team of professionals.

Unfortunately, many homeowners also underestimate the complexity of rodent infestations, leading to common mistakes that can worsen the problem and prolong the process.

Whether you choose to DIY or hire a professional, remember: when the temperature drops, rodent activity increases.

Rodents seek warm areas with a steady food supply in winter, which is why rodent control experts see their busiest seasons during fall and winter. In fact, 60% of professionals report an increase in rodent problems each year.

Effective preventive maintenance protects against rodent re-entry and reduces future infestations. It involves three key steps:
Rodent-proofing prevents infestations, saving you from damage and health risks. Professional services block entry and ensure proper cleanup and sanitation, providing comprehensive protection and peace of mind

If you find the process overwhelming, consider reaching out to a few rodent control companies for free estimates. This will give you the benefit of a professional inspection and the opportunity to ask detailed questions about your situation without any obligation.

We hope this helps, and if you’re interested, we’re happy to answer any questions you might have.

For more information, see T&C Section 10B
Bay Area rodent exclusion infographic outlining steps for safe and effective rodent removal by Alley Cat.
Alt text: Eviction notice infographic highlighting rodent damage costs and health risks, emphasizing Bay Area rodent exclusion services.
Infographic on rodent behavior and exclusion methods in the Bay Area, highlighting Alley Cat Rodent Exclusion strategies.
Rodent identification guide highlighting signs of infestation for effective Bay Area rodent exclusion services.

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