If you dislike the taste or smell of chlorine in your tap water, there are several ways to reduce it. But before choosing a method, there is one important question to answer: does your water utility use chlorine or chloramine?
Both are commonly used as drinking-water disinfectants, but they behave differently. Free chlorine is relatively easy to reduce through activated carbon filtration and can also dissipate over time. Chloramine is more persistent and generally requires a treatment method specifically suited to chloramine reduction.
Quick answer: For everyday household drinking water, activated carbon filtration is generally one of the most practical ways to reduce chlorine taste and odor. If your utility uses chloramine, look for a filter with performance information that specifically addresses chloramine, rather than assuming any carbon filter will perform equally well.
This guide compares the most common ways to dechlorinate tap water, explains which approaches work for chlorine versus chloramine, and helps you choose an appropriate method for drinking water and other household uses.
Chlorine vs. Chloramine: Why the Difference Matters
Public water systems use disinfectants to control microorganisms as water moves through treatment facilities and distribution pipes. Two commonly encountered disinfectants are chlorine and chloramine.
Chlorine
Free chlorine is reactive and relatively volatile. When chlorinated water is exposed to air, some chlorine can gradually dissipate. Heat can accelerate this process.
This is why simple approaches, such as allowing water to stand, can sometimes noticeably reduce the chlorine smell or taste.
Chloramine
Chloramine is formed by reacting chlorine with ammonia and is more persistent in water than free chlorine. That stability is useful to water utilities because it helps maintain disinfectant residual further along the distribution system.
For the homeowner, however, that persistence means methods that work reasonably well for free chlorine—such as simply leaving a pitcher on the counter—should not be assumed to work effectively for chloramine.
Before choosing a filter: Check your water utility's Consumer Confidence Report (CCR) or contact the utility directly to determine whether your water is disinfected with chlorine, chloramine, or a combination that changes during the year.
Why Do People Dechlorinate Tap Water?
For households receiving properly treated municipal water, the most common reason for reducing residual chlorine is taste and odor preference.
People may want to reduce chlorine or chloramine for:
- Everyday drinking water
- Coffee and tea
- Ice
- Cooking
- Brewing and fermentation
- Aquariums
- Certain plants or gardening applications
- Other specialized household uses
A noticeable chlorine smell does not by itself mean municipal water is improperly treated. Chlorine is deliberately added to public drinking-water systems as a disinfectant.
Important: Dechlorination should not be confused with making questionable water suitable for drinking. If your utility issues a boil-water advisory, do-not-drink notice, or other public health instruction, follow the utility's or local health authority's directions rather than relying on a household dechlorination method.
How to Dechlorinate Tap Water: 7 Methods
The best method depends primarily on whether you are dealing with free chlorine or chloramine, how much water you need to treat, and what you plan to use the water for.
1. Activated Carbon Filtration
Activated carbon is one of the most widely used technologies for reducing chlorine taste and odor in household drinking water.
Activated carbon has a highly porous structure that provides a large surface area for interactions with substances in water. Depending on the filter design and media, carbon filtration can reduce chlorine and other substances.
Free chlorine is generally easier to address than chloramine. Chloramine reduction may require greater contact time or carbon media, as well as filter designs specifically intended for that purpose.
For that reason, don't assume that a product capable of reducing chlorine will automatically provide equivalent chloramine performance. Review the manufacturer's current performance information for the specific filter.
2. Gravity-Fed Carbon Filtration
Gravity-fed countertop systems move water through filter elements without requiring household water pressure. Water is poured into an upper chamber, passes through the filtration media, and collects in a lower chamber.
The primary advantages are convenience and simple installation: countertop gravity systems generally do not require permanent plumbing or electricity.
As with any filtration system, actual chlorine or chloramine reduction depends on the specific filter element installed, not simply on the system being gravity-fed.
Berkey systems are one example of this type of countertop configuration. If you're comparing sizes, see our Berkey Water Filter System comparison guide.
3. Reverse Osmosis Systems
Reverse osmosis (RO) uses water pressure and a semipermeable membrane to reduce many dissolved substances. Residential RO systems commonly incorporate multiple treatment stages, including carbon filtration.
Those carbon stages are particularly relevant when chlorine or chloramine is present because the treatment configuration can protect the membrane while addressing disinfectant residuals.
RO can make sense for households seeking broader dissolved solids reduction, but it typically requires installation, water pressure, periodic filter and membrane replacements, and space beneath a sink or elsewhere.
For a broader comparison of RO, activated carbon, gravity filters, and other technologies, see our guide to drinking water filtration systems.
4. Letting Chlorinated Water Sit
Allowing water to stand can reduce free chlorine because chlorine can dissipate into the surrounding air.
The effectiveness and speed depend on factors such as water temperature, exposed surface area, initial chlorine concentration, airflow, and other water characteristics.
For example, a wide container exposes more water surface to the air than a narrow bottle.
This method is inexpensive and simple, but it is slow and difficult to control precisely. More importantly, it should not be relied upon for chloramine, which is substantially more persistent.
5. Boiling Water
Heating can accelerate the loss of free chlorine from water, so boiling may reduce the chlorine level.
However, boiling water solely to improve the taste of everyday chlorine is usually inconvenient and energy-intensive compared with filtration.
Boiling also should not be treated as a general contaminant-removal method. It does not simply remove all dissolved chemicals or metals, and evaporation can actually leave nonvolatile dissolved substances behind.
A boil-water advisory is a separate issue. When health authorities tell residents to boil water, the purpose and required procedure are determined by the specific advisory. Follow the official instructions rather than assuming ordinary dechlorination guidance applies.
6. Vitamin C
Ascorbic acid and sodium ascorbate—forms of vitamin C—can chemically neutralize chlorine and chloramine.
Vitamin C dechlorination is used in some specialized applications and can also be found in products intended for showers, baths, and other water uses.
For drinking water, only use a product specifically intended for that application and follow its instructions. Adding arbitrary quantities of vitamin C can change the water's chemistry and taste.
7. Purpose-Specific Water Conditioners
Aquarium water conditioners commonly quickly neutralize chlorine and chloramine, which is important because disinfectant residuals can harm fish and other aquatic organisms.
However, an aquarium product should not be assumed to be suitable for human drinking water. Use it only for the application specified by the manufacturer.
Similarly, industrial facilities may use chemicals such as sulfites, bisulfites, or other treatment processes for dechlorination. These systems require controlled dosing and monitoring and are not the normal choice for household drinking water.
What About UV Dechlorination?
Ultraviolet light can play a role in specialized advanced water-treatment processes, including applications designed to break down chlorine-containing compounds.
However, this should not be confused with an ordinary residential UV disinfection unit. Standard home UV systems are primarily designed for microbial treatment objectives and should not be assumed to automatically provide meaningful reductions in chlorine or chloramine.
For routine household drinking water, activated carbon and appropriately configured multi-stage filtration are generally more conventional approaches.
Which Dechlorination Method Is Best?
| Method | Free Chlorine | Chloramine | Best Use | Main Limitation |
|---|---|---|---|---|
| Activated carbon | Effective with appropriate design | Depends strongly on media, contact time, and filter design | Everyday drinking water | Performance varies by filter |
| Gravity-fed filtration | Depends on installed element | Depends on installed element | Countertop filtration without plumbing | Requires refilling and filter maintenance |
| Reverse osmosis system | Often addressed by accompanying carbon stages | Requires an appropriately designed treatment configuration | Broader under-sink water treatment | Installation and maintenance |
| Letting water stand | Can help | Not dependable | Small quantities where free chlorine is the issue | Slow and difficult to control |
| Boiling | Can accelerate reduction | Not a practical routine solution | Situational use | Energy-intensive and inconvenient |
| Vitamin C | Can neutralize | Can neutralize | Specific applications | Correct product and dosing matter |
How Do You Know If Your Tap Water Has Chlorine or Chloramine?
The best place to start is your local water utility.
Community water systems publish annual water-quality reports known as Consumer Confidence Reports (CCRs). These reports provide information about the water source, detected substances, and treatment system.
You can also contact the utility directly and ask:
- Do you currently use free chlorine or chloramine?
- Does the disinfectant change during different times of the year?
- What residual disinfectant concentrations are typically maintained?
Home test kits can provide additional information, but understanding what the utility intentionally adds is usually the simplest starting point.
If you're investigating your water more broadly, our Drinking Water Contaminants Reference Guide explains many of the substances consumers may encounter in drinking-water discussions.
Can You Remove Chlorine From Water Naturally?
If by “naturally” you mean without a filter or added treatment chemical, free chlorine can dissipate to some degree through exposure to air.
Heat can accelerate the process, and environmental conditions affect how quickly chlorine dissipates.
But there are two limitations:
- You don't have precise control over how much chlorine remains without testing.
- The same approach should not be expected to work effectively for chloramine.
If the goal is consistent everyday drinking water rather than occasional treatment of a small container, filtration is generally easier to manage.
Should Dechlorinated Water Be Stored Differently?
Chlorine and chloramine serve an important purpose in municipal distribution systems: they provide a disinfectant residual as treated water moves through pipes.
Once water has passed through a filter that reduces that residual, good container hygiene becomes especially important.
For household filtered water:
- Use clean food-grade containers.
- Wash reusable bottles and pitchers regularly.
- Keep dispensing areas and filter system components clean according to the manufacturer's instructions.
- Avoid unnecessary contact with the inside of clean storage containers or their spouts.
- Don't leave drinking water in dirty or open containers indefinitely.
The goal is not to fear dechlorinated water, but simply to recognize that filtration and good equipment hygiene go hand in hand.
Can Berkey Filters Reduce Chlorine Taste and Odor?
Berkey systems use a gravity-fed countertop design. Water is poured into an upper chamber and passes through the installed filter elements into the lower chamber.
Because filtration performance depends on the element installed, it is important to evaluate the testing and specifications for that particular filter rather than treating every Berkey configuration as identical.
For example, Phoenix Gravity filters are designed for municipal drinking water applications and use coconut-shell activated carbon media. They have tests relevant to chlorine and chloramine reduction, as well as other substances.
You can review the available data on our water filter test results page.
Choosing a system size? Instead of starting with an individual product, see our Berkey Water Filter comparison page to compare the Travel, Big, Royal, Imperial, Crown, and other configurations by capacity and household use.
How to Choose the Right Method for Your Home
If chlorine taste or odor is your main concern, choosing a treatment method doesn't need to be complicated.
Start with these questions:
- Does your utility use chlorine or chloramine?
- Are you treating only drinking water or water throughout the house?
- Are there other substances you also want the filter to address?
- Do you want a countertop, under-sink, faucet-mounted, refrigerator, or whole-house solution?
- How much maintenance are you comfortable with?
- What testing supports the filter's performance claims?
If chlorine is the only concern, a relatively simple carbon filter may be sufficient. If chloramine or additional water-quality concerns are involved, the filter media, design, contact time, and performance information become more important.
Our complete guide to drinking water filtration systems can help you compare the major treatment technologies before choosing one.
FAQ About Dechlorinating Tap Water
What is the easiest way to remove chlorine from tap water?
For routine household drinking water, activated carbon filtration is one of the most practical methods for reducing free chlorine taste and odor. Actual performance depends on the filter and operating conditions.
Will leaving tap water out overnight remove chlorine?
Allowing water to stand can reduce free chlorine because some of it can dissipate into the air. How much remains depends on the water and environmental conditions. This approach should not be relied upon for chloramine.
Does boiling tap water remove chlorine?
Heating and boiling can accelerate the loss of free chlorine. However, boiling is generally inconvenient as an everyday dechlorination method and should not be viewed as a universal method for removing other dissolved substances.
Is chloramine harder to remove than chlorine?
Yes. Chloramine is more persistent than free chlorine. If your utility uses chloramine, choose a treatment system with performance information specifically relevant to chloramine reduction.
Does activated carbon remove chloramine?
Some carbon-based filtration systems can reduce chloramine, but performance depends heavily on the carbon media, filter design, contact time, flow rate, and other factors. Check the specific filter's performance information rather than assuming all carbon filters work equally well.
Can I use aquarium dechlorinator for drinking water?
Do not assume an aquarium conditioner is appropriate for human consumption. Use products only for the applications identified by their manufacturers.
Should I remove chlorine from all the water in my house?
Not necessarily. If your primary concern is drinking water taste and odor, point-of-use treatment at the kitchen sink or countertop may be sufficient. Whole-house treatment is a distinct decision that involves plumbing, maintenance, treatment objectives, and water chemistry.
Final Thoughts: What's the Best Way to Dechlorinate Tap Water?
For everyday drinking water, activated carbon filtration is generally one of the most practical approaches to reducing chlorine taste and odor.
But chlorine and chloramine should not be treated as interchangeable. Free chlorine can dissipate, and many carbon filters can address it relatively straightforwardly. Chloramine is more persistent and calls for greater attention to filter media, design, contact time, and documented performance.
Methods such as standing or boiling can help with free chlorine in certain circumstances, while vitamin C and purpose-specific chemical treatments have their own applications. None should be assumed to be the best solution for every household.
The most useful first step is simple: find out which disinfectant your water utility uses. Then choose a treatment method whose performance and design match your actual water and the reason you want to treat it.