Tap Water for Guinea Pigs: Safe or Risky?

Your pet guinea pigs need access to clean and fresh water at all times to stay hydrated, and tap water is convenient. However, most tap water is treated with chemicals to make it potable, and the level of treatment depends on its source and local guidelines. So, does that mean it is safe for our little pets to consume?

Guinea pigs can drink tap water provided it is free of excessive chemicals and microorganisms. If a human can drink the tap water, so can a guinea pig. However, you can make tap water safer for your guinea pigs by boiling or filtering it to remove contaminants.

You can also ensure the water stays clean by using a drinking bottle designed for rodents. The bottles keep out larger contaminants like food or feces but still need to be cleaned regularly. Next, we’ll learn more about tap water for guinea pigs and alternatives should it not be safe to drink.

Should Your Guinea Pig Drink Tap Water?

If your tap water is safe enough for you to drink, it should be safe for your guinea pigs. However, understand their bodies are much smaller than ours, and they might be affected by additives in tap water, like chlorine, fluoride, or other chemicals.

According to this study, excessive fluoride consumption in guinea pigs showed no toxic side effects, only weight gain. However, the excess fluoride is kept in the bones and may take up to four years to expel from the body.

Check with your municipality or local water authority to determine the safety of the tap water for drinking. Also, remember that the water quality may fluctuate depending on the water treatment methods used, water mains piping and repairs, and reservoir levels.

So, if your tap water has a strong chlorine smell or high fluoride levels, let the water sit uncovered for 24 hours in a jug before replenishing your guinea pig’s water. Doing so will allow some of the chemicals in the water to dissipate, reducing potential harm to your pets.

To make tap water even safer for your guinea pigs, you can boil it. Boiling tap water for at least a minute will destroy disease-causing microorganisms such as bacteria, viruses, and protozoans. Of course, you should allow the water to cool to an ambient temperature before offering it to your guinea pigs.

If you still need convincing about giving your guinea pig tap water, read on to find some safe alternatives.

As you consider your guinea pig's water source, also consider the kind of cage they need for optimal health.

Alternatives To Tap Water

Instead of tap water, you can offer your guinea pigs alternatives such as the following:

Bottled Water

Plain bottled water should be safe to give to guinea pigs as long as it does not contain additives such as sweeteners or flavors. Artificial additives can harm guinea pigs, affecting their kidney function, energy levels, and weight. Some concerns around consuming bottled water are the plastic chemicals that leech into the water or that the water is untreated tap water.

It is essential to read the label on the bottled water before dispensing it to avoid harming your guinea pig unintentionally. Check for additives, mineral content, purification process, water source, and the type of plastic used. Additionally, you should avoid giving carbonated water to guinea pigs as it can affect their digestion.

Filtered Water

Guinea pigs can also drink filtered or purified water as long as the filtration system produces water suitable for pets. Examples of home water purification systems that you can consider using include the following:

  • Carbon filters. These are inexpensive and can be installed in various ways. They remove chlorine, lead, and sometimes parasites (depending on the type) but do not remove heavy metals, arsenic, or nitrites in the water.
  • Distillation. Distillation filters purify water by boiling it and collecting the steam. While effective in removing many impurities, distillers are expensive to run as they require energy to heat and cool the water.
  • Ceramic filters. Ceramic filters are made from high-fired diatomaceous earth and are highly effective at removing even minuscule impurities. However, these filters are fragile and must be regularly cleaned.
  • Reverse osmosis. Reverse osmosis filters effectively remove most impurities in water, except for some pesticides and radon. Additionally, these filters use a lot of water to flush away the waste or impurities filtered.
  • Ultraviolet light filters. These expensive filters are effective at killing microorganisms. However, they do not remove chemicals or metals. Therefore, they are best used in conjunction with other filters.

Fresh Water

You can give your guinea pigs fresh water from sources such as captured rainwater, flowing water from a stream, or even water harvested in other ways. For example, guinea pigs housed outside will enjoy dew on blades of grass.

Suppose you aren’t convinced of the harvested water’s purity. In that case, you can purify it using one of the filtration methods described earlier.

Should you have any doubts or concerns about the water quality in your area, it’s best to consult with a local veterinarian. They can provide specific recommendations for hydrating your guinea pigs based on your location.

How To Give Water To A Guinea Pig

The preferred method for giving guinea pigs water is using a mounted bottle with a metal spout, as they sometimes poop in water bowls. Clean the water bottle and spout regularly using a bottle brush and mild detergent. Rinse it well before refilling it with drinking water, and don’t screw the spout on too tight. Otherwise, it might impede water flow.

You can check if water drops come out of the spout by gently pressing the metal bearing in the spout. It should form a droplet on your finger and release an air bubble into the bottle. If this doesn’t happen, try loosening the cap and ensure the spout is free of build-up.

If your guinea pig isn’t drinking enough or is ill, you can also use a clean syringe to administer a few drops of water into its mouth.

How Do You Tell If Your Guinea Pig Is Drinking Enough?

Sometimes it might seem your guinea pig isn’t drinking its water. You can monitor the bottle’s water level to see if it goes down if you don’t actually see your guinea pig drinking. For example, it might be that it gets its water from the fresh veggies you feed it that it doesn’t need to drink water.

You can also check your guinea pig’s fresh poop and pee to see if it is properly hydrated. Its poop should be slightly sticky to the touch, and its urine should be clear. If the poop looks dry and the urine is dark or cloudy, there’s a good chance your guinea pig is dehydrated, especially if it appears sluggish. Should this be the case, take it to the vet as soon as possible.

However, you can avoid your pet becoming dehydrated by ensuring they have access to clean and fresh water at all times and have access to cool shade below 75°F. Also, offer water-rich fruit and vegetables such as cucumber, celery, and grapes often.


Guinea pigs can drink tap water provided it is free from excessive chemicals like chlorine and fluoride. You can improve tap water by filtering it through a home filter system or boiling it. If you are uncertain of the tap water’s quality, you can get advice from a local vet or municipality or use bottled water without additives.

While making sure your guinea pig has the right water, also check what veggies can a guinea pig eat to ensure they're getting a balanced diet.