Does Boiling Water Remove Chlorine? (2026 Answer)

Quick Answer: Yes — boiling removes free chlorine, but not much else. Chlorine gas dissolved in tap water dissipates with heat, so boiling for about 15-20 minutes (or letting water sit uncovered for roughly 24 hours) drives most of it off. It does not meaningfully remove chloramine, which the EPA says now disinfects water for more than 1 in 5 Americans, and it does nothing for lead, PFAS, arsenic, or nitrates — those non-volatile contaminants stay in the water and can even get slightly more concentrated as some water boils away.

It’s a reasonable question — chlorine’s smell and taste are the most common complaint people have about tap water, and boiling feels like a free, low-effort fix. It partly works, but the mechanism only covers one kind of disinfectant, and the myth that “boiling purifies water” in general leads people to skip real protection against things boiling can’t touch.

What boiling actually removes

Why chlorine dissipates but chloramine doesn’t

Free chlorine is a volatile gas dissolved in water, so heat and time are enough to drive it out — the same reason a glass of tap water left on the counter overnight tastes less chlorinated by morning. Utilities that disinfect with chloramine instead of chlorine chose it for the opposite reason: chloramine is a far more stable bond of chlorine and ammonia, engineered specifically to survive longer in distribution pipes without dissipating, which reduces recontamination risk between the treatment plant and your tap. The EPA reports that share has grown to cover more than one in five Americans. That durability doesn’t switch off just because you’re boiling the water at home — chloramine needs catalytic carbon (standard carbon pitchers handle it slowly and poorly) or a reverse osmosis membrane to remove it reliably. See our water filter for chloramine guide if that’s your specific concern, or a basic total-chlorine test strip from a water test kit to find out which disinfectant your utility uses.

Keeping a filter pitcher stocked with a spare cartridge means you’re never stuck boiling and cooling a pot of water just to get the chlorine taste out — and Amazon Prime ships replacement filters free in two days whenever one’s due. Try Prime free for 30 days →

Why boiling can’t fix lead, PFAS, or nitrates

Boiling only removes what evaporates. Lead, arsenic, other heavy metals, nitrates, and PFAS are non-volatile dissolved solids — they don’t turn into gas and escape when water is heated. Worse, if you boil water down enough to lose a meaningful share of its volume to steam, whatever non-volatile contaminants were dissolved in it become more concentrated in the water that’s left, not less. This matters most for nitrates, since the CDC specifically warns against boiling nitrate-contaminated water for infant formula for exactly this reason — it raises the concentration rather than lowering it. If lead, arsenic, or nitrates are a concern (common in older plumbing or private wells), the fix is a certified filter, not more time on the stove — see our water filter for lead or water filter for nitrates picks, or a full reverse osmosis system if you want broad-spectrum reduction in one step.

Boiling for taste vs. boiling for safety — two different jobs

It’s worth being precise about which problem boiling solves, because the two get conflated constantly. A boil water advisory is a public-health instruction to kill disease-causing pathogens — bacteria, viruses, and parasites — in water the utility has flagged as potentially contaminated. The EPA’s guidance there is a rolling boil for at least 1 minute (3 minutes above 5,000 feet elevation). That’s a safety step for water that might not be safe to drink at all. Boiling to strip out chlorine taste from otherwise-safe, routinely treated tap water is a completely different, optional step about flavor and smell, not safety. If you’re dealing with an actual advisory, see our full boil water advisory guide rather than treating this page as a substitute.

Is it actually worth doing?

For most households, boiling water just to remove chlorine taste isn’t a great trade. It takes 15-20 minutes, uses stove fuel or electricity, and then the water needs to cool before it’s drinkable — compared to a carbon pitcher or faucet filter that clears the same chlorine taste in the time it takes to fill a glass, with no waiting. A filter also covers chloramine (which boiling barely touches) and, depending on the model, contaminants boiling can’t address at all. Boiling is a reasonable one-off fallback if you have no filter handy and just want today’s water to taste better — it’s not a long-term substitute for one.

The bottom line

Boiling removes free chlorine because it’s a volatile gas that dissipates with heat, but it does little for chloramine and nothing for lead, PFAS, arsenic, or nitrates — some of which can even concentrate slightly as water boils down. If chlorine taste is your only complaint, a basic carbon pitcher solves it faster with no fuel required; if chloramine or dissolved contaminants are the concern, you need catalytic carbon or reverse osmosis, not more time on the stove. See our best water filter pitcher picks to skip the kettle, or best reverse osmosis system for full-spectrum reduction.

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