Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

Why Do Cats Sometimes Drink Dirty Water? Vet-Verified Reasons, Risks & Prevention Tips

Share

siamese cat drinking water

Some of the habits of our feline friends can perplex us as cat parents, which raises questions about their eating, sleeping, or grooming habits. For instance, even though your cat has a full and accessible water bowl, you’ll sometimes catch your cat drinking from the outside pond, the toilet bowl, or the water left in the sink.

When you quickly go to refill their water bowl and discover that it is already full, you are left wondering why cats sometimes drink dirty water. It is not uncommon, and there are a few practical reasons why your cat may do it, which we’ll discuss in further detail below.

divider 1 paws

Why Do Cats Drink Dirty Water? The 4 Possible Reasons

Your cat’s dirty water habit may be passed down from their wild ancestors that drink water from multiple available sources. There are a few reasons why your cat sometimes prefers to drink from other sources other than the water bowl you provided. It can mean that they prefer running water or that they are unsatisfied with the water you provided, the bowl itself, or the location of the drinking bowl.

1. The Size and Shape of Their Water Bowl

Some cats are picky with the size and shape of their bowl since they typically don’t enjoy it when their whiskers rub up against it or get wet. If you have just bought a new bowl that your cat isn’t enjoying, it could be because it is too narrow or too deep, and your cat would rather find another water source than be tickled or irritated every time they drink.


2. The Bowl May Be Too Close to Their Food

Cats don’t always enjoy drinking their water too close to where they eat, and you should try to separate their food and water bowls. In the wild, cats won’t drink from a water source close to their kill since it could contaminate the water. Therefore, your cat may refuse their water if it’s too close to their food bowl.

cat drinking water_Pixabay
Photo Credit: Pixabay

3. Water Has Been Sitting in the Bowl for Too Long

As you know, cats can be picky and fussy, and they have a nose for things that have gone bad, so if their water has been sitting in the bowl for too long, it may have accumulated dust particles or absorbed a smell from something around it.


4. Cats Like Multiple Drinking Sources

Cats won’t always drink from the same water source and naturally avoid their water source if there are predators nearby. If your cat’s bowl is not easily accessible and is the only water source, they may choose the muddy puddle instead. Another cat or dog in your house may prevent your pet from using the bowl if there are few options. You should provide your cat with multiple water bowls in different areas of the house, so they always have easy access to the water.

siamese cat drinking water
Photo Credit: Ermolaeva Olga 84, Shutterstock

divider 1 paws

Can Cats Get Sick from Drinking Dirty Water?

Yes, cats can get sick from dirty water, but it depends on how contaminated it is. Outdoor cats are also typically more likely to get sick than indoor cats.

1. Worms and Protozoa

Cats can get worms and protozoa from dirty water, such as roundworms, giardia, and tritrichomonas. They often come from stagnant water in warmer climates, which is an excellent breeding ground for certain parasites.


2. Leptospirosis

Cats can get infected by bacteria in the genus Leptospira, and this possibility should not be taken lightly because Leptospira can be transmitted to humans (zoonosis). There is no vaccine available for cats, as opposed to dogs. Stagnant surface water and marshy/muddy terrain are where the Leptospira spirochete infection is most common. These bacteria can survive in water for several months. Cats can also get infected by eating rodents. Cats that live near farms or wooded areas are more likely to become infected with the bacteria than other cats.


3. Toilets

If the toilet is a popular choice for your cat to drink from, don’t be fooled by how clean it may be. Toilets are a breeding ground for germs and bacteria that can harm your cat and potentially cause gastrointestinal upset. Furthermore, toilets contain cleaning agents such as bleach, which can also be harmful.


4. Ponds

If you have an outdoor pond with blue-green algae, your cat can get poisoned from the cyanobacteria present in it. Signs of algae toxicity include vomiting, diarrhea, disorientation, trouble breathing, liver failure, seizures, and death. 

Cat drink water fountain
Image Credit: Kimsan0131, Shutterstock

divider 1 paws

Cats Enjoy Running Water

Some cats instinctively have a preference for running water. This is because they know that stagnant water isn’t the safest option. Another reason is that drinking water from a bowl can put them in a vulnerable position, especially in a corner that forces them to face their back to potential predators. Running water is also more oxygenated and has a more appealing taste and smell for cats, which is why cat water fountains have become more popular.

How to Get a Cat to Stop Drinking Dirty Water

Now that we know your cat can potentially become ill from drinking dirty or contaminated water, here are some ways to get your cat to drink from their bowl and to discourage them from consuming dirty water.

  • Use a shallow water bowl with a wide rim
  • Ensure that your cat’s water bowl is cleaned thoroughly every day
  • Use stainless steel, ceramic, or glass water bowls
  • Provide multiple drinking bowls around the house
  • Keep your cat’s drinking bowl away from their food bowl
  • Change the location of your cat’s water bowl if your cat gets bored of it
  • Consider trying a water fountain if your cat prefers running water
  • Filter your water if you use tap water
  • Add chicken or fish broth that is low in sodium to make your cat’s water more enticing
  • Add ice cubes made from bone broth or diluted tuna water

divider 1 paws

Conclusion

While it may seem nonsensical and concerning for an owner who provides their cat with a full bowl of water, there are a few reasons why cats sometimes choose to drink dirty water. It could be the size and shape of their bowl, the position of their bowl, or the quality of their water. Some outside water sources are perfectly safe for your cat, but it’s best to avoid them since the water could be toxic or contaminated. You should encourage your cat to drink from their designated water source by providing clean, fresh water every day and following the guidelines we provided above.


Featured Image Credit: Piqsels

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything cat

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.




How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.


Catster's Digital Magazine is Back!

Vet-approved health & behavior advice

Real cat stories & community features

Weird Cat Behaviors That Actually Make Perfect Sense

We have been sharing our lives with cats for thousands of years, yet we still find ourselves genuinely stumped by what they get...

The Dream of Talking to Cats Just Got Closer to Becoming a Reality

If you’ve ever wished your cat could simply tell you what they wanted, you’re not alone. From the meow that wakes you before...

Kizzy: The Feline Princess With a Purpose

We were first introduced to Miss Kizzy after she won a licky-treat challenge hosted by Professor Fluffovich, our resident feline research specialist. While...

Chatting With Sally About Mission Meow & Helping Cat Rescue Organizations Collaborate | Chatty Cattys, Episode 24

In this episode of Catster’s podcast, Chatty Cattys, Nicole and Dr. Karyn sit down with Sally Williams, the founder of Mission Meow, for...

More related

Why Do Mother Cats Attack Their Older Kittens? 4 Vet-Reviewed Reasons

Queens occasionally reject kittens who appear to be ill or spend less time caring for weaker ones when they have particularly large litters...

Can Cats Eat Mac & Cheese? Vet-Reviewed Info to Know!

Most cats love cheese, and when this feline favorite is mixed in with a bit of butter, milk, and pasta, it becomes the...

10 Best Non-Clumping Cat Litters in 2026 – Reviews & Top Picks

Before bringing home your new kitten or cat, you know that there is a ton of research to do, from what toys, bedding,...

Traveling With Kittens: 9 Vet-Approved Tips

Getting ready to hit the road with kittens in tow requires planning, but traveling safely, happily, and comfortably with baby cats is possible....

Keep reading

Mouth Cancer in Cats: Vet-Reviewed Signs & When to Euthanize

One of the most difficult parts of pet ownership is making end-of-life decisions. Knowing when to euthanize a beloved animal companion is never easy, and there’s no right answer for every situation. Personally, I’ve had to make that choice three...

cat mouth check by vet

Why Do Cats Scratch? 4 Vet-Reviewed Reasons for This Behavior

Have you lost count of how many times you’ve had to stop your cat from scratching your couch, carpet, or curtains? While cat scratching is nothing new to their owners, you may be left wondering why your feline participates in...

cat scratched leather

Are ZZ Plants Toxic to Cats? Vet-Reviewed Houseplants Examined

Famously known as the ZZ plant, the Zamioculcas zamiifolia is a popular houseplant due to its ability to thrive even in unfavorable conditions. These hardy plants grow to about 3 feet tall indoors and have bright-green glossy leaves that some...

Catster_Are ZZ Plants Toxic to Cats

What to Do When Your Cat Has an Asthma Attack: Vet Approved Tips

It may be a surprise to learn that just like people, cats can have asthma, and it can be a frightening experience when your cat suddenly suffers from an asthma attack. While it’s a condition that your cat will have...

a cat that feels sick and seems to vomit

Horner’s Syndrome in Cats: Our Vet Explains Signs, Diagnosis & Management

The neurologic system is a complex network of nerves, signals, and responses. When something goes wrong or there is an injury within the neurologic system, physical abnormalities can be seen. Such is the case with Horner’s syndrome, a collection of...

Cat with eye infection looking at camera

Can Cats Eat Quail Eggs? Vet-Approved Nutritional Benefits & Facts

As obligate carnivores, it’s no wonder that cats absolutely love any product that comes from an animal, including dairy! Of course, that doesn’t necessarily mean they can have these products, but they certainly will be attracted to them. You might...

Can Cats Eat Quail Eggs

6 Vet-Approved Natural Home Remedies to Treat Scabs on Cats

Frequent and persistent scabbing on your cat’s body is not normal. Keep track of where the scabs appear on your cat’s body and schedule a visit to your veterinarian immediately once you notice them. Treatment of the cause varies widely...

Close up of a rash or Diagnosis of scabies or Dermatological diseases on the skin of the cat's ears

How Do Cats Show Sadness? 8 Vet-Verified Ways

Many of us who love cats are drawn to their independent and aloof natures. Compared to their canine counterparts, it can sometimes be a challenge to know what your feline buddy is thinking and feeling. Don’t mistake their chill vibe...

sad looking cat lying on a table

Love Cats? So Do We! Join the Catster Community

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.




Sign up for the Catster Email Newsletter

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.