Chlorine is widely used in public drinking-water treatment to maintain a disinfectant residual as treated water moves through distribution pipes. Many households, however, notice a chlorine-like taste or odor and want to know whether Berkey® filtration can reduce it.
Quick answer: Yes. Berkey® systems can reduce chlorine when equipped with filter elements that have documented chlorine-reduction performance. The Phoenix Gravity New Millennium Edition Filter Element PGF9-2 itself is listed by NSF under NSF/ANSI 42 for chlorine reduction, with NSF's listing footnote stating that the component was tested to 4,000 liters for chlorine and taste-and-odor reduction. NSF separately lists Travel Berkey®, Big Berkey®, and Royal Berkey® configurations featuring Phoenix elements under NSF/ANSI 42 for chlorine reduction and taste-and-odor reduction. Black Berkey® Elements have separate product-specific testing and should be evaluated using their own documentation.
Why Is Chlorine Added to Drinking Water?
Chlorination has been used in U.S. public drinking-water treatment for more than a century. One of chlorine's key roles is to leave a residual disinfectant that continues to work as treated water moves through the distribution system.
Water utilities manage disinfectant levels to balance treatment needs, regulatory requirements, and taste and odor concerns.
Important context: chlorine is intentionally used because it provides a significant public health benefit. The goal is not to eliminate chlorine from the treatment process, but to keep disinfectant residuals within regulated limits while maintaining effective treatment.
Chlorine vs. Chloramine
Some public water systems use free chlorine, while others use chloramine, which is formed by combining chlorine with ammonia. Chloramine is more persistent in distribution systems and is therefore used by some utilities to maintain a longer-lasting residual.
Both can affect taste and odor. Chloramine can also be more difficult to reduce with basic carbon filtration, so filter performance should be verified specifically for chloramine rather than inferred from a chlorine claim.
How Much Chlorine or Chloramine Is Allowed in Drinking Water?
EPA regulates residual disinfectants using Maximum Residual Disinfectant Levels (MRDLs). For chlorine and chloramine, compliance is generally based on a running annual average rather than a single household reading.
| Disinfectant | EPA MRDL |
|---|---|
| Chlorine | 4.0 mg/L as Cl₂ |
| Chloramine | 4.0 mg/L as Cl₂ |
| Chlorine dioxide | 0.8 mg/L |
If you want to know which disinfectant your utility uses, start with your annual Consumer Confidence Report or contact the utility directly.
Why Does Tap Water Smell or Taste Like Chlorine?
A noticeable chlorine smell usually indicates that some residual disinfectant remains when the water reaches the faucet. The odor may be more noticeable depending on treatment practices, water temperature, seasonal conditions, and the location within the distribution system.
A noticeable chlorine odor does not automatically mean the water exceeds EPA's MRDL. Human odor perception varies considerably.
What Are Disinfection Byproducts?
Disinfection byproducts can form when chlorine or other disinfectants react with naturally occurring organic matter in source water. Two regulated groups are:
- Total trihalomethanes (TTHM)
- Haloacetic acids (HAA5)
| Disinfection Byproduct Group | EPA Maximum Contaminant Level |
|---|---|
| Total trihalomethanes (TTHM) | 0.080 mg/L (80 µg/L) |
| Haloacetic acids (HAA5) | 0.060 mg/L (60 µg/L) |
Public water systems monitor regulated disinfection byproducts and report results in annual water-quality reports. Levels can vary by source-water conditions, treatment, distribution-system location, and season. A household chlorine test does not measure TTHMs or HAA5; those require the appropriate laboratory analysis.
How to Check Chlorine and Disinfection Byproduct Levels
The best starting point is your Consumer Confidence Report. You can also:
- Ask whether your utility uses chlorine or chloramine.
- Review reported TTHM and HAA5 levels.
- Use a household chlorine test for basic residual-disinfectant screening.
- Use an appropriate laboratory when you need more detailed water analysis.
Test strips have limits: a home chlorine test can estimate residual disinfectant levels, but it cannot determine the concentrations of individual trihalomethanes, haloacetic acids, or other contaminants.
Can Home Filtration Reduce Chlorine Taste and Odor?
Yes. Activated carbon is widely used to reduce chlorine-related taste and odor. Performance depends on the carbon media, contact time, flow rate, source-water chemistry, and maintenance.
| Filtration Approach | Common Use |
|---|---|
| Activated carbon | Commonly used for chlorine taste and odor reduction |
| Catalytic or chloramine-optimized carbon media | Often used where chloramine reduction is a specific concern |
| Whole-house carbon | Used when chlorine odor is a concern throughout the home |
| Gravity-fed filtration | Point-of-use drinking-water filtration; performance depends on the installed element |
Using a Berkey® system?
Match the chlorine or chloramine evidence to the exact filter elements installed. If you need replacement elements now, Phoenix Gravity New Millennium Edition™ Filter Elements are the current compatible replacement option for Berkey® gravity-fed systems.
Does Berkey® Remove Chlorine?
Yes—when the installed filter elements have documented chlorine-reduction performance.
The key is to match the performance evidence to the exact elements in your system. Black Berkey® Elements and Phoenix Gravity New Millennium Edition™ Filter Elements are separate products with separate test documentation.
Black Berkey® Elements
Customers who already have Black Berkey® Elements installed should refer to the Black Berkey® chlorine-specific testing for those elements. Their performance should not be inferred from Phoenix data. Standalone Black Berkey® replacement elements remain unavailable through normal authorized U.S. distribution channels, so customers who need compatible primary replacement elements should now review the Phoenix Gravity option.
Phoenix Gravity New Millennium Edition™ Filter Elements
Phoenix Gravity elements have independent laboratory testing for chlorine and chloramine, while NSF separately lists specific Phoenix-equipped Berkey® configurations for chlorine reduction and taste-and-odor reduction.
| Phoenix Test | Influent | Effluent | Conservative Reduction |
|---|---|---|---|
| Free chlorine | 2.0 mg/L | <0.1 mg/L | >95.00% |
| Chloramine | 3.02 mg/L | <0.1 mg/L | >96.69% |
These values come from the April 2026 Atom laboratory report summarized on TheBerkey.com. When an effluent result is reported below a laboratory threshold, the reduction is conservatively presented using the stated limit.
Phoenix NSF Certification for Chlorine Reduction
There are two distinct NSF/ANSI 42 listings to understand. First, the Phoenix Gravity New Millennium Edition Filter Element PGF9-2 is listed as a filter-cartridge component. NSF's listing footnote states that the component was tested to a capacity of 4,000 liters for chlorine and taste-and-odor reduction.
Second, NSF separately lists Travel Berkey®, Big Berkey®, and Royal Berkey® configurations featuring Phoenix Gravity New Millennium Edition™ Filter Elements under NSF/ANSI 42 with a listed 1,050-gallon service cycle for:
- Chlorine reduction
- Taste and odor reduction
Verify the current listings in NSF's official database: PGF9-2 component listing, NSF/ANSI 42 listing and NSF/ANSI/CAN 372 listing. Standard 372 addresses lead-content requirements in product materials; it is not a lead-reduction claim.
Certification and independent testing are different. Phoenix chloramine performance is documented through independent laboratory testing. The current NSF-listed Berkey® configurations identify chlorine reduction and taste-and-odor reduction as certified claims; they should not be described as NSF-certified for chloramine reduction unless the certification listing specifically says so.
For current Phoenix and Black Berkey® laboratory evidence and certification details, review the Berkey® Filter Test Results.
Black Berkey® vs. Phoenix: Which Chlorine Data Applies?
| Question | Black Berkey® Elements | Phoenix Gravity Elements |
|---|---|---|
| Which product data should you use? | Use Black Berkey®-specific chlorine test information when Black Berkey® Elements are installed | Use Phoenix-specific testing and certification information when Phoenix elements are installed |
| Element-level NSF/ANSI 42 listing | Do not infer Phoenix certification from Black Berkey® data | PGF9-2 is listed as an NSF/ANSI 42 filter-cartridge component; NSF's footnote states 4,000-liter testing for chlorine and taste-and-odor reduction |
| Current NSF/ANSI 42 chlorine certification on Berkey® system configurations | Do not infer Phoenix certification from Black Berkey® data | Travel, Big, and Royal Berkey® configurations featuring Phoenix are currently listed under NSF/ANSI 42 for chlorine reduction and taste-and-odor reduction |
| Chloramine | Use Black Berkey®-specific documentation | Independent April 2026 laboratory testing reported >96.69% conservative reduction under the documented conditions |
Do not mix performance claims between elements. A laboratory result or certification for Phoenix does not automatically apply to Black Berkey® Elements, and Black Berkey® test results do not automatically apply to Phoenix.
How to Choose a Filter for Chlorine or Chloramine
- Does your utility use chlorine or chloramine?
- Are you primarily trying to improve taste and odor?
- Are TTHMs or HAA5 listed in your water-quality report?
- Do you want drinking-water filtration or whole-house treatment?
- Does the exact filter have documented performance with chlorine or chloramine?
- What maintenance and replacement schedule applies?
Maintenance Matters
- Prepare or prime elements as directed.
- Install only compatible elements.
- Clean system components according to instructions.
- Monitor flow, taste, and odor.
- Replace elements according to their applicable service-life guidance.
Should You Be Concerned About Chlorine in Tap Water?
For public water systems, chlorine and chloramine are deliberately used and regulated. The presence of a disinfectant residual does not by itself mean the water is unsafe.
At the same time, some households may prefer to reduce chlorine-related taste and odor or may want to better understand disinfection byproducts reported by their utility.
The practical starting point is your Consumer Confidence Report. From there, identify whether your utility uses free chlorine or chloramine, review any reported TTHM and HAA5 results, and choose testing or filtration based on the actual water-quality concern rather than on odor alone.
Frequently Asked Questions
Does Berkey® remove chlorine?
Yes, when the installed filter element has documented chlorine-reduction performance. Current Travel, Big, and Royal Berkey® systems featuring Phoenix Gravity New Millennium Edition™ Filter Elements are listed under NSF/ANSI 42 for chlorine reduction and taste and odor reduction.
Does Phoenix Gravity reduce chlorine?
Yes. In the April 2026 Atom laboratory report, free chlorine was tested at 2.0 mg/L and measured below 0.1 mg/L after filtration, supporting a conservative reduction greater than 95% under the documented conditions.
Is Phoenix NSF certified for chlorine reduction?
Yes, with an important distinction. PGF9-2 itself is listed as an NSF/ANSI 42 filter-cartridge component; NSF's listing footnote states that it was tested to 4,000 liters for chlorine and taste-and-odor reduction. Travel Berkey®, Big Berkey®, and Royal Berkey® configurations featuring Phoenix are separately listed under NSF/ANSI 42 for chlorine reduction and taste-and-odor reduction with a 1,050-gallon listed service cycle.
Does Berkey® reduce chloramine?
Chloramine performance depends on the exact filter element. Phoenix Gravity laboratory testing reported a conservative reduction greater than 96.69% under the April 2026 test conditions. Use element-specific documentation rather than assuming a chlorine claim automatically covers chloramine.
What is EPA's chlorine limit in drinking water?
EPA's Maximum Residual Disinfectant Level for chlorine is 4.0 mg/L as Cl₂. The MRDL for chloramine is also 4.0 mg/L as Cl₂.
Why does my tap water smell like chlorine?
A chlorine-like odor usually reflects residual disinfectant remaining in the water at the tap. Odor intensity varies and does not by itself establish that the water exceeds EPA's MRDL.
Can a home chlorine test measure THMs or HAAs?
No. A home chlorine test can estimate residual disinfectant but cannot identify or accurately measure individual disinfection byproducts such as trihalomethanes or haloacetic acids.
Does a TDS meter measure chlorine?
No. A handheld TDS meter estimates dissolved ionic content from conductivity and cannot reliably measure chlorine or determine disinfectant concentration.
Does boiling remove chlorine?
Boiling can reduce some free chlorine through volatilization, but it should not be treated as a general solution for disinfectants or disinfection byproducts. If chlorine taste or odor is the concern, use a filtration method with appropriate documented performance.
Is chlorine-free water automatically better?
No. Chlorine is deliberately used to help maintain public-water quality. Whether additional point-of-use filtration is useful depends on taste preference, the disinfectant used, the water-quality report, and the performance of the filter being considered.
How do I know whether my utility uses chlorine or chloramine?
Check your annual Consumer Confidence Report or contact the water utility directly. Utilities often identify the disinfectant used and report residual disinfectant information.
Final Thoughts
Chlorine and chloramine play important roles in public drinking-water treatment, but residual disinfectants can still affect taste and odor, and regulated disinfection byproducts are important to understand.
For Berkey® owners, the key is to match the evidence to the exact filter elements installed. Black Berkey® Elements and Phoenix Gravity New Millennium Edition™ Filter Elements have separate product-specific performance information.
PGF9-2 has an NSF/ANSI 42 component listing for chlorine reduction, with NSF's footnote documenting 4,000-liter testing for chlorine and taste-and-odor reduction. Phoenix-equipped Travel Berkey®, Big Berkey®, and Royal Berkey® configurations are separately listed under NSF/ANSI 42 for chlorine reduction and taste-and-odor reduction, while Phoenix also has independent laboratory data for free chlorine and chloramine.
Start with your utility's water-quality report, identify whether chlorine or chloramine is used, and choose filtration based on documented performance for that specific concern.
Ready to compare Berkey® filter options?
Review Berkey® element-specific laboratory data, compare current replacement filters, or shop Phoenix Gravity elements for a compatible Berkey® system.