The one technology this site cannot check for you
Every other page here ends the same way: search the claim in NSF’s listing, confirm your model holds it, buy that one.
For a distiller that instruction fails at the first step.
The count, with controls
NSF’s search form lists standards and, under each, the claims you can select.
| Standard | Selectable options |
|---|---|
| NSF/ANSI 53 | 70 |
| NSF/ANSI 58 | 51 |
| NSF/ANSI 401 | 16 |
| NSF/ANSI 42 | 7 |
| NSF/ANSI 44 | 4 |
| NSF/ANSI 55 | 2 |
| NSF/ANSI 177 | 1 |
| NSF/ANSI 62 | 0 |
Every other standard returns a non-zero count. The zero under 62 is a real absence, not a failed count.
NSF names NSF/ANSI 62 as Drinking Water Distillation Systems. It publishes no claim under it that a buyer can search.
→ Which claims exist at all, and how populated each is
So what can be said instead
Process descriptions from health authorities, which is a different kind of evidence.
Minnesota Department of Health: distillers “boil water, which makes steam. The steam rises and leaves contaminants behind. The steam hits a cooling section, where it condenses back to liquid water.”
Anything that does not evaporate with the water stays in the boiling chamber. That is the whole mechanism, and it explains the breadth of what follows.
What MDH says it removes
A long list, and the interesting part is the end of it.
Colour, taste and odour issues. Arsenic, bacteria, calcium, chloride, copper, fluoride, iron, lead, magnesium, manganese, nitrate, nitrite, other dissolved solids, some pesticides and other synthetic organic compounds, radium, selenium, sodium, sulfate, uranium and viruses.
Several of those have no NSF reduction claim under any standard. Uranium is the clearest: EPA regulates it at 30 µg/L and NSF offers nothing to certify a product against.
→ Radium and uranium: four standards, one certified claim
So distillation reaches contaminants the certified market does not cover — and is itself uncertifiable by claim.
The boil advisory point
MDH states distillers “kill 100% of bacteria, viruses, and pathogens, so you can still drink your water during boil water advisories or if your well becomes contaminated.”
That is MDH describing the process, not a certified result, because there is no claim under which it could be certified.
It is also the one household technology with that property. Reverse osmosis carries a warning against relying on it for microorganisms; carbon carries none at all.
→ Boil water notices, and the two households that need an exception
What it costs, and what it costs you
MDH puts a distiller at 300 to 1,200 dollars initially, with the running cost being “energy cost to boil water.”
Those are Minnesota figures from 2017 quotes and 2018 research. Treat them as a scale.
And the drawback MDH names: “Water may taste ‘flat’ because oxygen and minerals are reduced.” The minerals stay in the chamber with everything else.
There is no point-of-entry version. MDH gives no whole-house figure and marks the technology as not typically available that way.
The same pattern, one standard over
NSF/ANSI 55 covers ultraviolet systems. It offers two selectable options, and neither names an organism: Disinfection Performance, Class A (125 products) and Disinfection Performance, Class B (237).
So ultraviolet is certified to a performance class, and distillation to nothing searchable at all. Two technologies that act on everything rather than on a named contaminant, and NSF’s contaminant-by-contaminant structure has no good way to describe either.
What separates Class A from Class B is defined in the standard itself, which is not publicly readable. This site does not publish a distinction it cannot source.
→ The NSF standards, and what each one covers
The decision framework
1. Accept that you are buying a process
No listing will confirm your model against your contaminant. That is the honest position, and no amount of searching changes it.
2. Check whether a certified route exists first
If your contaminant has a claim — lead, nitrate, PFAS, fluoride, cyst — a certified product can be verified and a distiller cannot.
→ How to check a certification claim yourself
3. Distillation earns its place where no claim exists
Uranium is the clearest case. So is any contaminant on the 33-entry list with no NSF claim at all.
→ The regulated contaminants with no certified filter
4. Price the energy, not the appliance
The purchase is 300 to 1,200 dollars. The running cost is boiling every litre you drink, indefinitely.
5. Expect batch output and flat taste
It is an appliance that processes a container at a time, and MDH names the taste change as a drawback rather than a side note.
The decision path
| Your situation | What decides it | Where that lands you |
|---|---|---|
| Contaminant has an NSF claim | A certified model can be verified | Use the certified route |
| Uranium on your report | No NSF claim exists for it | Distillation is a real option |
| Nitrate over the limit | 84 certified RO models exist | Certified route available |
| Want microbial safety at the tap | MDH’s 100 percent statement | Distillation, uncertified |
| Under a boil advisory | Follow the notice you were given | The notice governs |
| Want whole-house treatment | No point-of-entry distiller | Point-of-use only |
| Cost-sensitive | Energy cost is permanent | Compare against a carbon block |
| Want a verifiable purchase | No searchable claim under 62 | Distillation cannot give you that |
Choose a distiller if
- Your contaminant has no NSF claim under any standard, and the alternative is buying nothing verifiable either way.
- You want a single appliance covering dissolved solids, metals and organisms, and accept that the evidence is a process description rather than a listing.
Choose a certified product if
- Your contaminant has a claim. Verification is worth more than breadth when both are available.
Choose neither if
- Your report shows nothing above a limit. Breadth of removal is not a reason to treat water that has no measured problem.
→ Testing city water: what your utility already measured
Mistakes that cost the most money
Searching NSF for a certified distiller by contaminant. There is no selectable claim under NSF/ANSI 62, so the search returns nothing however you phrase it.
Reading that absence as a verdict on the technology. It means NSF publishes no searchable claim, not that distillation fails.
Buying one for a contaminant that has a certified claim. You are trading verification for breadth you may not need.
Ignoring the energy cost. The appliance price is once; boiling every litre is forever.
Expecting whole-house coverage. No point-of-entry distiller figure is given by MDH, and the technology is marked as not typically available that way.
Treating a process description as a certification. MDH’s 100 percent statement describes the mechanism, not a tested and listed result.
Three situations, and what changes
Uranium above 30 µg/L on a report. The market has no certified answer — uranium has no NSF claim under any standard. MDH names distillation among the technologies that remove it. This is the case where a distiller is the sensible purchase precisely because verification was never available.
Lead in an older home. The opposite case. 615 models hold an NSF/ANSI 53 lead claim across six product forms. Buying an uncertifiable appliance here gives up something you could have had.
A household that wants one device for everything. Distillation is the broadest single technology on MDH’s table, and the trade is real: higher running cost, batch output, flat taste, and no listing to check. Knowing all four before buying is the point.
The objections worth answering
“If it were any good NSF would certify it.” NSF names NSF/ANSI 62 as a standard. What it does not publish is a searchable claim under it, which is a statement about the listing rather than about the technology.
“Distilled water is stripped and unhealthy.” MDH names reduced oxygen and minerals as a taste drawback. This site takes no position beyond that, and the same reduction is what removes sodium, sulfate and dissolved solids.
“Boiling at home does the same thing.” It does not. Boiling concentrates dissolved contaminants by removing water as steam; a distiller collects the steam and discards what stays behind.
“It is the safest option during an advisory.” MDH’s statement supports the microbial part. Follow the notice you were issued, which may carry instructions a general statement cannot anticipate.
“Reverse osmosis does the same job more cheaply.” It has certified claims and a listing to check, and it sends several gallons to the drain per gallon produced. Different trade, not a strictly better one.
→ Reverse osmosis: what NSF/ANSI 58 actually certifies
Who this is for
Anyone who has tried to find a certified distiller and come away empty, and anyone weighing a distiller against a filter for a contaminant that may or may not have a claim behind it.
It is also for readers who have followed this site’s method and deserve to be told plainly where that method stops working.
What to settle first
Does my contaminant have an NSF claim at all?
If it does, the certified route is better because it can be checked. If it does not, distillation stops being the unverifiable option and becomes one of the few options.
→ The regulated contaminants with no certified filter → Which claims exist at all, and how populated each is → The NSF standards, and what each one covers → Reverse osmosis: what NSF/ANSI 58 actually certifies → How to read your water quality report