Cats don’t always drink as much as they should—and they’re picky about what they drink, too. That’s why water quality matters more than you might think. Clean, filtered water supports your cat’s kidneys, digestion, and overall health. This guide breaks down how to keep your cat safe and hydrated.
Why Cats Need Water
Water helps your cat:
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Flush out toxins
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Stay cool
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Keep their kidneys working properly
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Maintain a healthy coat and digestion
The problem? Cats have a naturally low thirst drive, especially if they eat mostly dry food. That makes clean, appealing water a must.
Signs of Dehydration in Cats
Look for:
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Dry or sticky gums
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Sunken eyes
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Lethargy
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Less appetite
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Less peeing or darker pee
A quick skin test (pinch and release) can also help. If the skin doesn’t bounce back fast, your cat may be dehydrated.
What’s in Tap Water?
Your water might look fine, but here’s what could be hiding in it:
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Chlorine and chloramine
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Lead and copper (from old pipes)
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PFAS (aka “forever chemicals”)
Even low levels of these can cause issues for sensitive cats. If your tap water smells or tastes off, it’s not ideal for pets.
Is Tap Water Safe for Cats?
Sometimes. But cats with kidney issues or sensitive stomachs may react to chemicals or metals in tap water. If your cat has digestive trouble, dry skin, or urinary problems, poor water quality could be a factor.
Filtered vs. Bottled vs. Tap Water
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Tap water is easy but may contain additives.
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Bottled water can have microplastics or added minerals.
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Filtered water is usually the best everyday option.
A simple carbon filter can remove chlorine and odors. For deeper purification, a reverse osmosis (RO) system can take out heavy metals, fluoride, and more.
What Do Vets Recommend?
Most vets suggest filtered or purified water—especially for cats with urinary issues, diabetes, or kidney problems. If your cat’s on a special diet, clean water helps the treatment work even better.
Easy Water Filters for Cat Owners
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Countertop carbon filters
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Under-sink systems
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Reverse osmosis for well water or older pipes
These systems also improve water for humans, making them a win-win.
How Much Water Should Cats Drink?
On average:
3.5 to 4.5 ounces per 5 pounds of body weight
So, a 10-pound cat should drink about a cup a day.
Wet food helps, but dry food-only cats need to drink more. Keep clean water available at all times.
How to Get Your Cat to Drink More
Try this:
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Use a pet fountain (cats love running water)
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Offer multiple bowls in quiet spots
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Test different bowl shapes and sizes
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Add a splash of tuna water or broth (no salt/onions)
Even picky cats can be encouraged to drink more with a few simple tricks.
Kittens and Senior Cats
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Kittens dehydrate quickly, so frequent water access is key.
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Senior cats may drink less or have medical conditions that increase their risk for dehydration.
Both age groups benefit from fresh, clean water and close monitoring.
Dangers of Contaminated Water
Outdoor bowls, puddles, or unfiltered water can carry:
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Giardia
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E. coli
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Parasites
Clean your cat’s bowl daily and avoid leaving water outside unless it’s monitored.
Final Thoughts
Filtered water isn’t a luxury—it’s part of good cat care. It supports everything from kidney health to hydration habits and helps prevent illness.
If you’d drink filtered water yourself, your cat should too.
Resources
FAQs About Water for Cats
1. Why is water important for cats?
It helps with kidney health, digestion, and hydration—especially for cats that eat dry food.
2. Is tap water safe?
It depends. Filtered water is safer and reduces exposure to additives or metals.
3. Can cats drink distilled water?
Only occasionally. It lacks minerals and isn’t ideal for long-term use.
4. Are fountains good for cats?
Yes! They encourage drinking and keep water fresher.
5. What kind of bowl is best?
Stainless steel or ceramic—easy to clean and less likely to hold bacteria.
6. Can cats drink cold water?
Yes. Some prefer it, especially in warm weather.
7. How often should I change the water?
At least once a day, more often if it gets dirty.
8. Can cats go without water for a day?
They can, but it’s not safe. Dehydration sets in quickly.
9. Why is my cat drinking less?
It might be the food (wet vs. dry), the bowl, stress, or even illness.
10. Should I add anything to their water?
Usually, no. Use plain water unless your vet says otherwise.
