The short answer
Yes — for most healthy adults, drinking plain room-temperature water from a copper bottle is safe. Water left overnight in copper typically picks up well under 1 mg per litre — often around 0.1–0.5 mg/L — comfortably below the WHO drinking-water guideline of 2 mg/L and the NIH tolerable upper limit of 10 mg a day. Keep to still, room-temperature water, refresh it daily, and skip hot or citrus drinks.
So, is it safe to drink copper water every day?
For most healthy adults, yes. Drinking plain, room-temperature water from a well-made copper bottle sits comfortably inside recognised safety limits. Water left to stand in copper overnight tends to pick up only a small amount of the metal — studies of water stored in copper containers found levels well under 1 mg per litre, often in the region of 0.1 to 0.5 mg per litre for water left overnight, rising gradually the longer it stands. That is well under the World Health Organization's drinking-water guideline of 2 mg per litre.
Copper is also an essential nutrient the body needs in small amounts. Adults are advised to get about 0.9 mg a day, mainly from food, and the tolerable upper limit for long-term daily intake from all sources is 10 mg. A glass or two of copper-stored water a day contributes only a fraction of that.
The bolder health claims you'll see elsewhere — that copper water aids digestion, immunity and the like — aren't backed by strong evidence, so you won't find them here. What the science does let us set out clearly is where the safe limits sit and how to stay comfortably inside them, which is what the rest of this guide is about.
What the safe limits actually say
It helps to see the numbers side by side. Three independent bodies have each published a reference point for copper: the World Health Organization (a global drinking-water guideline), the NIH Office of Dietary Supplements (dietary intake) and the US Environmental Protection Agency (a tap-water action level for utilities). None of them is a threshold you're likely to reach from a copper bottle used sensibly.
Put simply: the amount of copper that overnight water picks up is a fraction of every one of these figures. The two that matter most for everyday use are the WHO's 2 mg/L for water and the NIH's 10 mg/day ceiling for total daily intake — and ordinary copper-bottle use sits well below both.
How to use a copper bottle safely
A few simple habits keep you firmly inside the safe zone, and they're the same habits that keep the water tasting clean.
Still, room-temperature water only. Copper bottles — and our 4-litre copper dispenser — are made for plain water at room temperature. Copper isn't for hot drinks: heat speeds up how much of the metal dissolves, so keep tea, coffee and boiling water well away from it, and don't put copper in the fridge.
Nothing acidic. Lemon water, citrus, juice, squash and fizzy drinks all draw more copper out of the surface than plain water does. If you love a copper vessel for a cold, tangy drink, reach for a tumbler or mule mug rather than a sealed bottle, and rinse it soon after — those are made with that in mind.
Refresh it daily. The longer water sits, the more copper it gradually gathers. Filling your bottle fresh each morning, and giving it a rinse, keeps levels low. A glass or two a day is a sensible amount for most adults.
Look after the inside. A gentle scrub with half a lemon and a pinch of salt now and then, followed by a thorough rinse, keeps the surface bright. Because lemon lifts copper, that's for cleaning only — tip it away, don't drink it.
Who should take extra care
Copper suits most people, but a few should check with a clinician before making it a daily habit.
People with Wilson's disease or another copper-metabolism disorder. These conditions change how the body handles copper, so anyone living with one should follow their own doctor's advice rather than general guidance like this.
Infants under one. A baby's intake is tiny relative to their size and their systems are still developing, so we'd steer clear of copper-stored water for infants and defer to your GP or health visitor.
During pregnancy. Copper needs shift in pregnancy, and it's easy to be getting copper from a prenatal supplement and diet already. If you're pregnant and want to use a copper bottle, it's worth a quick word with your GP or midwife first.
This page is general information, not medical advice. If you're unsure whether copper water is right for you, your GP, midwife or pharmacist is the right person to ask about your own circumstances.
That green tinge — what verdigris is, and what to do
Open a copper bottle that's sat unused and you may find a bluish-green film inside. This is verdigris — a natural tarnish that forms when copper meets air and moisture over time. It's an ordinary part of owning copper, not a sign the bottle is faulty, and it's related to the same hand-finished surface and living patina that give real copper its character.
The rule is simple: don't drink water that's been standing on it — rinse the green away first. A scrub with lemon and salt, or a little vinegar, lifts it easily. Rinse thoroughly, tip that water away, then refill with fresh. Emptying and rinsing your bottle at the end of each day keeps verdigris from forming in the first place.
Copper or stainless steel — which suits you?
Neither is 'safer' in the abstract. Used as intended, both are perfectly fine — the honest way to choose is by how you actually drink.
Stainless steel is the neutral all-rounder: it holds hot and cold, shrugs off citrus and juice, and asks nothing of you. Copper is a different kind of object. It's for people drawn to the ritual and heritage of tamra jal — the centuries-old Ayurvedic practice of storing water in copper — who don't mind its few rules and rather enjoy the daily habit.
If you want one bottle for everything, including hot tea and lemon water, steel is the easier life. If you want plain water, a considered morning routine and an object that softens and patinas with age, copper is the one. Plenty of people keep both — steel for the gym bag, copper for the bedside table.
The bottom line
For a healthy adult drinking plain, room-temperature water, a copper bottle is a safe daily companion — the amount of copper involved is a small fraction of every published limit. Keep it to still water, skip the hot and citrus drinks, refresh it each morning, and rinse off any green before you drink.
If that sounds like your kind of routine, the 900ml Copper Water Bottle is a straightforward place to begin, and our free Morning Water Ritual guide walks you through it. Prefer copper just for cold, zesty drinks? The tumblers and mule mugs are made for exactly that.
| Reference point | The figure | What it means for you |
|---|---|---|
| WHO drinking-water guideline | 2 mg per litre | The level the World Health Organization considers safe for lifelong daily drinking |
| NIH recommended intake (adults) | 0.9 mg per day | The everyday amount of copper adults are advised to get, mainly from food |
| NIH tolerable upper limit | 10 mg per day | The most an adult should take in daily from all sources over the long term |
| EPA action level | 1.3 mg per litre | A US tap-water threshold that triggers utility action — a useful yardstick |
| Typical overnight leaching | under ~0.5 mg per litre | What plain water left standing in copper overnight tends to pick up |
Copper safety reference points at a glance (with sources)
Common questions
Is it safe to drink water from a copper bottle every day?
For most healthy adults, yes. Plain, room-temperature water left in copper overnight typically gains well under 1 mg of copper per litre — often around 0.1–0.5 mg/L — comfortably below the WHO's 2 mg/L drinking-water guideline. A glass or two a day, from a bottle you refresh each morning, sits well within safe limits.
How much copper water is too much?
There's no need to count glasses for ordinary use. The figures that bound it are the WHO's 2 mg per litre for water and the NIH's 10 mg per day upper limit for total intake from all sources. Copper-stored water adds only a fraction of these, so a couple of glasses a day is well within the safe range for a healthy adult.
Does copper leach into the water, and is that dangerous?
A little copper does dissolve into standing water — that's normal. Studies of water stored in copper vessels found levels that stayed well within the WHO 2 mg/L guideline, rising gradually the longer water sat. It only becomes a concern if you store hot or acidic drinks, which draw out far more, or leave water sitting for many days.
Is copper water safe during pregnancy?
Copper needs change in pregnancy, and many people are already getting copper from a prenatal supplement and their diet. Copper water isn't known to be harmful in sensible amounts, but because everyone's situation differs, it's worth a quick word with your GP or midwife before making it a daily habit. This page is general information, not medical advice.
Can children drink from a copper bottle?
We'd avoid copper-stored water for infants under one, whose intake is large relative to their size and whose systems are still developing — check with your GP or health visitor. For older children the usual safe-use rules apply, but if you're unsure about your child specifically, ask a clinician.
Who should not drink copper water?
People with Wilson's disease or another copper-metabolism disorder should follow their doctor's advice rather than general guidance, as their bodies handle copper differently. Infants under one are best kept to other vessels. Anyone pregnant or unsure about their own health should check with a GP, midwife or pharmacist first.
Can you get copper poisoning from a bottle?
From plain, room-temperature water used and refreshed sensibly, it's very unlikely — the copper involved is far below recognised limits. The situations that raise copper sharply are storing hot drinks, citrus or juice in copper, or leaving water to stand for many days. Stick to still water, refresh daily, and you stay well clear.
Why has my copper bottle gone green inside?
That green film is verdigris — a natural tarnish copper forms with air and moisture. It's ordinary, not a fault. Don't drink water that's been standing on it; rinse the green away with lemon and salt or a little vinegar, rinse thoroughly, tip that water out, and refill fresh. Emptying and rinsing daily keeps it from forming.
Sources
- The WHO's health-based guideline value for copper in drinking water is 2 mg per litre, considered safe for lifelong daily consumption. World Health Organization — Copper in Drinking-water (background document)
- The recommended dietary allowance for copper in adults is 0.9 mg a day, and the tolerable upper intake level is 10 mg a day. NIH Office of Dietary Supplements — Copper Health Professional Fact Sheet
- The US EPA sets an action level of 1.3 mg per litre for copper in drinking water. US Environmental Protection Agency — Lead and Copper Rule
- Copper measured in water stored in copper containers stayed well within the WHO 2 mg/L permissible limit across the storage times tested, rising only gradually the longer the water stood. Applied Water Science (2022) — Water quality and risk assessment of copper content in drinking water stored in copper container
Last reviewed: July 2026.