Short answer: for fluoride and lead, yes — distillation leaves the vast majority of both behind in the boiling chamber, and US public-health and university sources list both among the substances distillation removes. For PFAS (“forever chemicals”) the answer is more cautious: the physics is favourable for the PFAS most often found in tap water, but independent test data on home distillers is limited, so the carbon post-filter and good maintenance matter.
How does a distiller separate contaminants from water?
A countertop distiller heats water in a stainless-steel boiling chamber until it turns to steam. The steam rises, is cooled by a fan-driven condenser and turns back into liquid in a separate collection bottle. Anything that cannot evaporate at water's boiling point — dissolved metals, salts, minerals — has no way to follow the steam, so it stays in the chamber. That is why owners find a layer of scale to rinse out after every batch.
The same principle explains the method's one real weakness. Substances that evaporate as easily as water, or more easily, can travel with the steam. The University of Nebraska–Lincoln's extension guide on distillation names volatile organic compounds such as benzene and toluene, and notes that they are not completely removed unless another process is added — for example an activated-carbon filter on the condensed water. Megahome distillers use exactly that arrangement: the condensed water passes through an activated-carbon post-filter before it reaches the bottle.
Does a water distiller remove fluoride?
Yes. Fluoride is dissolved in water as a mineral ion and does not boil off at 100 °C. The University of Nebraska–Lincoln guide lists fluoride among the compounds distillation removes, alongside sodium, calcium, magnesium and nitrate. In practice, distilled water contains very little fluoride, whatever the level in the water you pour in.
Whether you want that is a separate question. Many health authorities support fluoride in community water for dental health, and some households prefer to manage their intake themselves. Neither choice is a reason to worry — but if distilled water becomes your main drinking water, it is sensible to mention it to your dentist, who can advise on toothpaste and other fluoride sources. For babies and young children, follow your paediatrician and your local health authority.
Does a water distiller remove lead?
Yes. The US Centers for Disease Control and Prevention (CDC) lists lead among the chemicals distillation removes, together with arsenic, barium, cadmium, chromium and nitrate. Lead is a metal; it stays in the boiling chamber.
Two points are worth knowing:
- Boiling a kettle is not the same thing. The US EPA answers the question “Does boiling water remove lead?” with a plain “No”. When you boil water in an open pot, some water evaporates and the lead stays behind in a smaller volume. A distiller does the opposite: it keeps the steam and leaves the residue.
- Lead usually comes from the building, not the source. Old service lines, solder and some older fittings are the typical causes, and levels can vary from tap to tap and hour to hour. A distiller protects the water you drink and cook with; it does not fix the plumbing. If you suspect lead, have your water tested and ask your water supplier about pipe replacement.
Does distillation remove PFAS “forever chemicals”?
This is where honesty matters most. PFAS are a family of thousands of man-made compounds. The ones most often measured in drinking water, such as PFOA and PFOS, are present in a dissolved, ionised form and do not readily evaporate with the steam — so the physics of distillation suggests they remain in the boiling chamber, just as salts do.
However:
- Independent, peer-reviewed data on countertop distillers and PFAS is limited. Most published removal figures come from sellers of distillers, so we do not quote them here.
- The US EPA's consumer page on reducing PFAS at home lists granular activated carbon, reverse osmosis and ion-exchange resins, and recommends products certified to NSF/ANSI 53 or 58 for PFAS reduction. Distillation is not mentioned.
- Some PFAS-related compounds are more volatile than PFOA and PFOS. Those are the kind of substances an activated-carbon stage is meant to catch — one more reason to replace the carbon post-filter on schedule.
The fair summary: distillation is expected to significantly reduce the common PFAS, but it is not a certified PFAS technology. If your water supplier reports PFAS above the local limit, follow its advice and your health authority's guidance first.
Contaminant by contaminant: what should you expect?
| Contaminant | What distillation does | Keep in mind |
|---|---|---|
| Fluoride | Stays in the boiling chamber | Talk to your dentist if distilled water is your main source |
| Lead, arsenic, cadmium, chromium | Stay in the boiling chamber | Boiling alone does not remove lead; test water from old pipes |
| Nitrate | Stays in the boiling chamber | Boiling in an open pot concentrates it instead |
| PFAS such as PFOA and PFOS | Expected to be significantly reduced | Limited independent data; not an EPA-listed home PFAS method |
| Bacteria, viruses, parasites | Removed | Keep the collection bottle clean |
| Chlorine, chloramines | Removed | The carbon post-filter polishes taste |
| VOCs (e.g. benzene, toluene), some pesticides | Can carry over with the steam | This is the job of the activated-carbon post-filter |
How do you get the best results?
- Test before you decide. Your water supplier's quality report or a certified laboratory test tells you which contaminants you are actually dealing with.
- Replace the carbon post-filter on schedule. For normal tap water, follow the manual (owners commonly change it about weekly in daily use). For water of uncertain quality, such as well or stored water, Megahome recommends a new sachet every 5 batches (20 litres).
- Descale regularly. The University of Nebraska–Lincoln guide notes that scale makes a distiller less efficient and raises electricity use. Citric acid works well; hard water needs it more often.
- Use a timer. The unit keeps heating until the chamber is dry, which bakes scale on. Many owners use a plug-in timer set to about 5 hours 40 minutes.
- Set realistic expectations. A 4-litre batch takes about 5.5–6 hours, and the fan is audible — many owners run it in a kitchen or utility room.
If water is known to be chemically contaminated — for example after an official notice — do not rely on home treatment; use an alternative supply as directed. Our guide to what boiling, filtering and distilling each do covers that situation in detail, and is distilled water safe to drink every day? answers the most common follow-up question.
Why does the build of the distiller matter?
Because contaminants concentrate in the boiling chamber, the materials that touch the water matter. Megahome has made distillers in Tainan, Taiwan, since 1992. Its units use a stainless-steel boiling chamber and steam dome, an activated-carbon post-filter and a glass or PP collection bottle; the MH-943SBS uses 316 stainless steel. The MH943T-SW and MH943S-SW models hold TÜV Rheinland GS certificate 50514575, and as of September 2026 Megahome distillers have around 5,000 Amazon ratings averaging 4.5–4.7 stars. You can explore the MH-943TWS or find a local dealer on our where to buy page.
Key takeaways
- Fluoride, lead and other heavy metals stay in the boiling chamber; CDC and university guidance list them among the substances distillation removes.
- Boiling water in a kettle does not remove lead, fluoride or nitrate — it concentrates them.
- Distillation is expected to significantly reduce common PFAS, but independent data is limited and it is not an EPA-listed home PFAS method.
- Volatile compounds can travel with the steam, which is why the activated-carbon post-filter matters and should be replaced on schedule.
- Test your water first, descale regularly, and use an alternative supply if water is known to be chemically contaminated.
Frequently asked questions
Does distilled water contain any fluoride?
Very little. Fluoride does not evaporate with the steam, so the vast majority stays in the boiling chamber. If distilled water is your main drinking water, ask your dentist about other fluoride sources such as toothpaste.
Can I just boil water to get rid of lead or PFAS?
No. The US EPA states that boiling does not remove lead, and the same applies to other substances that do not evaporate: as water boils off, they become more concentrated. Distillation works because it collects the steam in a separate container.
Is a distiller certified for PFAS removal?
Current PFAS certifications referenced by the US EPA (NSF/ANSI 53 and 58) cover filters and reverse-osmosis systems. Distillation is expected to significantly reduce common PFAS, but we are not aware of an equivalent certification for home distillers, so we do not claim one.
Should I discard the first part of each batch?
The University of Nebraska–Lincoln guide mentions discarding the first half-litre as one way to reduce volatile compounds. With an activated-carbon post-filter that is replaced on schedule, most households do not need to — but it is a reasonable extra step with water of uncertain quality.
Sources
- US CDC – About Home Water Treatment Systems
- University of Nebraska–Lincoln Extension – Drinking Water Treatment: Distillation (G1493)
- US EPA – Does boiling water remove lead?
- US EPA – Reducing PFAS in Your Drinking Water with a Home Filter
- TÜV Rheinland Certipedia – GS certificate 50514575
- Amazon.com – Megahome countertop water distiller (customer ratings)