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How to Get Rid of Cat Urine Smell in a Basement – 4 Simple Steps

Cat urine is an odor like no other. Though we love our cats, dealing with cat urine smells is a frustrating experience. If you don’t clean it immediately, the smell can linger and permeate all your surfaces.

With many cat owners keeping the litter box in the basement, it’s a common spot for cat urine spots and smells. Whether you have a concrete floor or a finished basement with carpeting, tile, or other flooring, the smell can become overwhelming quickly. Here are the steps for how to get rid of cat urine smell in a basement and keep it from becoming a problem in the future.

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Supplies You’ll Need

  • Ultraviolet light
  • Mop and bucket with cleaning solution (hard floors)
  • Shampooer (carpeting)
  • Ionic or enzymatic cleaner
  • White vinegar
  • Baking soda
  • Dish detergent
  • Hydrogen peroxide


The 4 Steps to Get Rid of Cat Pee Smell in a Basement

1. Find the Urine Spots

If you don’t catch a cat urine stain immediately, it can be more difficult to find the spots and effectively remove the smell. Invest in an ultraviolet (UV) light that can highlight urine stains and show you where to clean. You can find UV lights cheap in hardware stores, department stores, and online.

Turn out the lights and run the UV light close to the floor. Any cat urine stains will light up in a bright white or purple, giving you a good idea of the stain’s location and shape. Use chalk or tape to mark the area around the stain so you can see it when the lights are on.

cat urine as seen on UV light
Image Credit: In The Light Photography, Shutterstock
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2. Clean the Floor

Before you can tackle the stains themselves, you’ll need to clean the whole floor. For concrete or hard flooring, use a mop and soap and water to clean any residue off the floor. For carpeting, you may want to rent a carpet shampooer to get the carpet thoroughly cleaned first, but keep in mind that you may need to wait a day or two for it to dry.

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3. Address Fresh Urine Stains

If you witnessed your cat peeing on the floor or know that the urine is fresh, you can clean it with a paper towel or cloth. Don’t rub, which can push urine deeper into the floor. Once the excess is mopped up, you can use an ion-based or enzymatic cleaner designed for pet stains. These cleaners are specially formulated to treat pet stains, not just for the odor humans can smell, but for the odors cats and dogs can smell that attract them to the same spot.

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mopping floor
Image Credit: jarmoluk, Pixabay
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4. Treat Old Urine Stains

Older urine stains are more difficult to treat and contribute to a lot of the odor in your basement. With a hard, porous surface like concrete, the stain can settle into the material and lasts for years but becomes strong when it gets wet. On carpeting, the urine can settle into the fibers and beneath, making it more difficult to clean and remove effectively.

For old stains, you may need to use a combination of products to remove the smell completely. White vinegar, hydrogen peroxide, and an enzymatic cleaner can be effective.

Here are the mixtures:

  • White vinegar and water: Combine two parts white vinegar with one part hot water and pour it onto the stain to soak.
  • Hydrogen peroxide: Mix two cups of hydrogen peroxide with two teaspoons of baking soda and a drop or two of dish detergent. Pour the mixture onto the stain to soak.

You can use either of these mixtures to treat the urine stain and let them dry. Once that’s complete, spray the stain with the enzymatic cleaner to break down the uric acid. Allow the treatment to sit for 24 hours. If any smell remains after the spot is dry, treat again with the enzymatic cleaner.

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Why is My Cat Peeing Outside of the Litter Box?

Cats usually take to litter box training quickly. Accidents happen, but if your cat is peeing outside of the litter box constantly, it could indicate a problem. Most litter box issues can be treated to prevent urine stains in the future.

Image Credit: victorhugosilvafotografo, Shutterstock

Here are some possible reasons for accidents:

  • Medical problems: Some medical conditions can cause inappropriate urination, such as a urinary tract infection, kidney disease, or diabetes. Discuss your concerns with your vet and rule out these common medical causes.
  • Dirty litter box: Like people, cats prefer a clean area for their bathroom habits. If you’re not being as diligent as you should be with litter box cleaning, your cat may choose to go elsewhere. Keep up with your litter box cleaning at least once a day (multiple times a day for multi-cat households) and change out the litter completely every week or two.
  • Litter box location: If the litter box isn’t easy for your cat to access or located in an unfavorable area, your cat may be inclined to find other areas to pee. Litter boxes should be out of high-traffic areas, but not so secluded that your cat feels vulnerable or threatened while trying to use them. Keep in mind that areas with a lot of strange sounds, such as near the washer and dryer, or in tight spots like a hallway or confined room, may be scary to your cat. Consider moving the litter box to a different spot to see if it fixes the problem.
  • Litter type: Cats can be particular about the type of litter they’ll use. They feel the litter on their feet and are sensitive to the sensation, so your litter box issue may be caused by the type of litter you’re using. Try a few different types of litter to find the one your cat prefers. If possible, set up multiple identical litter boxes with different litter.
  • Multi-cat households: Peeing outside the litter box could be the result of conflict in multi-cat households. Some cats can be bullies and may force another cat out of the litter box, causing inappropriate urination. If you have a timid cat or a cat that’s bullied by the others, look for a different spot to keep their litter box. You should also avoid covered litter boxes in multi-cat households, since they can “trap” a cat in a fearful situation with a bully cat.
  • Stress and anxiety: Cats are sensitive to environmental changes. Something as simple as moving the litter box to another spot in the house can trigger stress. When this happens, your cat may pee outside the litter box to relieve their anxiety with a familiar smell. If you suspect this is the cause, try to determine the change that triggered the stress and do what you can to minimize it.

Get Rid of Urine Smells for Good

These steps to remove cat urine stains from your basement are effective for both new and old stains. Preventing inappropriate urination by treating its underlying causes is much easier than addressing old, set-in stains, so keep an eye on changes in behavior and take your cat for a checkup to rule out medical causes.

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Featured Image Credit: Stokkete, Shutterstock