Copper Water Bottle Side Effects, Dangers and Copper Poisoning

If you've searched “copper water bottle poisoning", you're probably in one of two places: worried about a bottle you already own or deciding whether to buy one. Here is the honest answer. Used as intended, with plain water, overnight, in modest amounts, a copper water bottle is low risk for most healthy adults. But copper is not harmless. Misuse can raise your copper intake, and some people should avoid copper water altogether.

This guide covers the side effects, how copper poisoning actually happens, who should be careful, and how to use a copper bottle safely. We sell copper bottles, so we've leaned on government and medical sources rather than our own opinion.

The quick answer

• Typical use: low risk for healthy adults when you use plain water and follow the traditional timing.
• Most likely side effect: stomach upset, such as nausea, stomach pain or diarrhoea, when copper levels get too high.
• Real poisoning: linked to much higher exposures, such as acidic drinks left in unlined copper, copper supplements, plumbing, or an inherited condition called Wilson's disease.
• Who should check with a doctor first: anyone with Wilson's disease or a liver or kidney condition, anyone pregnant or breastfeeding, and anyone giving drinks to babies and young children.

Copper water bottle side effects: what can actually happen?

The most commonly reported effect of too much copper in a drink is stomach upset. The U.S. Agency for Toxic Substances and Disease Registry (ATSDR) says that ingesting a high amount of copper, usually in drinking water, can cause vomiting, nausea, abdominal pain and diarrhoea. ATSDR's longer technical review notes that these symptoms have been reported after drinking beverages stored in copper or unlined brass containers.

Here is what the research says about how much it takes:

• A Connecticut Department of Public Health fact sheet based on ATSDR guidance says stomach symptoms can occur above roughly 3 to 5 mg/L of copper in drinking water and that they go away when exposure stops.
• A large community study reported in Environmental Health Perspectives found stomach symptoms such as nausea and abdominal pain at concentrations of about 4 to 6 mg/L.
• The World Health Organization's drinking-water guideline is 2 mg/L, set well below those levels.

What about the liver and kidneys? ATSDR and the CDC say that taking in more copper than recommended every day over time, for example through water or supplements, can lead to serious illness such as kidney and liver damage. At the same time, the Connecticut fact sheet notes that liver or kidney damage in healthy people exposed through drinking water has not been reported in the scientific literature. The risk is much higher for people with Wilson's disease (see below).

How does copper poisoning happen?

For a copper water bottle, poisoning is not something that happens from a glass of plain water. It generally requires a particular mistake or a particular medical condition. These are the main routes.

1. Acidic drinks in unlined copper. The U.S. FDA Food Code says copper and copper alloys such as brass may not touch food with a pH below 6, such as vinegar, fruit juice or wine. In 2017, Iowa's Alcoholic Beverages Division reminded bars about this rule for Moscow Mule mugs, because acidic drinks can pull copper out of the metal. The Merck Manual also lists acidic food or drink in prolonged contact with a copper container as a cause of acquired copper toxicity. That rule governs licensed food businesses, and officials stressed that one drink won't cause a crisis, but the chemistry is the same at home. This is why lemon water, juice, soda and vinegar-based drinks don't belong in a copper bottle.

2. Leaving water sitting for days, or using a corroded bottle. The traditional method is 6 to 8 hours or overnight. Longer contact means more copper dissolves, and a pitted or corroded interior is not something to keep using.

3. Too much copper from other sources. The NIH sets an upper limit that counts all sources: food, drinks and supplements together. Copper supplements and copper plumbing can add to what you get from water. Adding a daily copper water habit on top of a high-dose supplement is a combination to avoid without medical advice.

4. An inherited condition. Wilson's disease is a rare genetic disorder in which the body can't remove extra copper, so it builds up in the liver, brain, eyes and other organs, according to the NIH's National Institute of Diabetes and Digestive and Kidney Diseases. People with this condition are particularly sensitive to copper.

5. Infants and milk or formula. Some doctors have linked a rare childhood liver disease to milk boiled or stored in corroded copper or brass vessels. The cause is debated and likely involves genetic susceptibility, but the practical lesson is simple: don't prepare or store infant formula or milk in copper vessels.

How much copper is too much? The key numbers

The last row is from a laboratory study of copper pots, not a typical home bottle, and your results will vary with the bottle, the water and the storage time. Still, it shows why plain water stored overnight sits far from the levels that cause symptoms.

Signs you may have had too much copper, and what to do

The symptoms to know are the same ones ATSDR and MedlinePlus describe: nausea, vomiting, stomach pain and diarrhea. Yellowing of the skin or eyes (jaundice) is a more serious sign.

• Stop using the bottle and empty any water left in it.
• For mild stomach upset, the symptoms usually settle when exposure stops. If they don't, or you're worried, talk to your doctor.
• For advice on a possible poisoning, call the Poison Help line at 1-800-222-1222 in the U.S.
• For severe symptoms, such as repeated vomiting, yellow skin or eyes, confusion, or trouble breathing, call 911 or go to the emergency room.

Who should be careful or avoid copper water?

• Anyone with Wilson's disease or another condition that affects copper, including liver disease. Ask your doctor before using copper water at all.
• Babies and young children. Their upper limit is far lower than an adult's, and they shouldn't have drinks or formula prepared in copper vessels.
• People taking copper or multivitamin-mineral supplements, or high-dose zinc, which can affect copper balance. Check with your doctor or pharmacist.
• Anyone with a medical condition or taking regular medication, if you're unsure. A quick question to your doctor is worth it.

Is copper bottle water good for pregnancy?

You may see the claim that “copper bottle water is good for pregnancy” online. We could not find evidence that copper water benefits pregnancy, so we won't make that claim.

Here is what is known. Copper is an essential nutrient in pregnancy, and the recommended amount is slightly higher than usual: 1 mg per day, compared with 0.9 mg for other adults. The NIH notes that typical U.S. diets already meet or exceed the adult recommendation, and the 10 mg upper limit applies from all sources. That's a reason not to treat copper water as a way to top up your intake.

We can't tell you whether copper water is right for your pregnancy. If you are pregnant, breastfeeding or planning to be, ask your doctor or midwife before making copper water a regular habit. They know your health history and what's in your prenatal vitamin.

Copper water bottle benefits and side effects: the balance

Copper does kill bacteria in laboratory tests, and it's an essential mineral. Most of the other benefits you see online have limited research behind them, which we cover in our guide to copper water bottle benefits. The side effects, on the other hand, are mostly about how a bottle is used. Plain water, sensible timing and a clean bottle keep the risk low. That's the same approach in our Tamra Jal guide.

How to use a copper water bottle safely

1. Plain water only. No lemon water, juice, soda, vinegar-based drinks or alcohol.
2. Stick to 6 to 8 hours or overnight, then empty and refill. Don't leave the same water in for days.
3. Keep amounts modest. One to two glasses is a common practice, not a medical recommendation.
4. Skip heat and freezers. No hot liquids, microwave or freezer.
5. Clean it gently. Wipe with lemon juice and salt every week or two, then rinse thoroughly with water so no acidic residue stays in the bottle.
6. Inspect it. If the inside is pitted, flaking or covered in green crust, stop using it.
7. Choose pure, uncoated copper from a seller who states the material clearly, and avoid bottles of unknown metal.
8. Notice a strong metallic taste or stomach upset? Empty the bottle and take a break.
9. Keep it away from infant feeds. Don't use copper vessels to prepare or store formula or milk for babies.

Frequently asked questions

Can a copper water bottle cause copper poisoning?

It's unlikely when you use plain water for the traditional 6 to 8 hours. Poisoning is linked to much higher exposures, such as acidic drinks in unlined copper, supplements, plumbing or Wilson's disease.

What are the side effects of copper bottle water?

The most common is stomach upset: nausea, stomach pain, vomiting or diarrhea. These are linked to high copper levels and usually settle when exposure stops.

Is it safe to drink from a copper bottle every day?

Many healthy adults do, in modest amounts and with plain water. If you have a medical condition or take medication or supplements, ask your doctor first.

Is copper bottle water good for pregnancy?

We found no evidence that it is. Copper is needed in pregnancy, but most diets provide it. Ask your doctor or midwife before making copper water a regular habit.

What are the dangers of copper water bottles?

The main dangers come from misuse: acidic drinks, long storage, damaged or corroded bottles, and combining copper water with other sources of copper. People with Wilson's disease and young children are most at risk.

Is a green bottle dangerous?

Copper naturally darkens or develops a green tint. A light tint can be cleaned off, but a thick green crust or pitted interior is a reason to stop using the bottle.

What should I do if I think I've had too much copper?

Stop using the bottle and call the Poison Help line at 1-800-222-1222 for advice. Call 911 for severe symptoms.

These statements have not been evaluated by the FDA. This content is for general information and is not medical advice. If you have a health condition, are pregnant or breastfeeding, or are giving drinks to a child, talk to your doctor.

Sources

• CDC and ATSDR: Copper fact sheet
• ATSDR ToxGuide for copper
• Connecticut Department of Public Health: copper in drinking water fact sheet
• Environmental Health Perspectives: Copper in Drinking Water, Using Symptoms of Exposure to Define Safety (2004)
• NIH Office of Dietary Supplements: Copper fact sheet for consumers
• NIH Office of Dietary Supplements: Copper fact sheet for health professionals
• NIDDK: Wilson disease
• Merck Manual: Copper toxicity
• CBS News: Copper cocktail mugs may cause food poisoning, health officials say (Iowa Alcoholic Beverages Division advisory, 2017)
• Indian Journal of Medical Research: Indian childhood cirrhosis and ICC-like diseases (2013)
• Sudha VB, et al. Storing drinking-water in copper pots kills contaminating diarrhoeagenic bacteria. Journal of Health, Population and Nutrition, 2012.
• Healthline: Copper water benefits and downsides
• World Health Organization: Copper in drinking-water