Distilled Water vs Filtered Water: What’s the Difference?

The most important thing to understand is that "filtered water" is not one thing. Distilled water is a single, specific result: water boiled to steam and condensed back, stripped of nearly all minerals and contaminants. "Filtered water" is a spectrum, from a basic carbon pitcher that mainly improves taste and keeps the water's minerals, all the way to a reverse osmosis system that removes almost as much as distillation.

So the honest answer to "distilled vs filtered" depends entirely on the filter. In general: a typical carbon-filtered water keeps its minerals and taste and is the cheap, easy choice for everyday drinking, while distilled water is maximum purity with no minerals, best for appliances and specialized uses. Both are safe to drink.

"Filtered Water" Isn't One Thing

This is where most comparisons go wrong: they treat "filtered" as a single purity level. It isn't. Filtration ranges across a wide spectrum:

• A carbon pitcher or fridge filter improves taste and smell and removes some contaminants, but leaves most dissolved solids, and the minerals, in place.
• A carbon block certified for health contaminants (NSF/ANSI 53) additionally reduces things like lead and certain chemicals.
• A reverse osmosis system pushes water through a membrane that removes most dissolved solids, including minerals, approaching the purity of distilled water.
• Distilled water sits at the far end, with nearly everything removed.

Unlike distilled water, which is an FDA-regulated bottled-water category, "filtered" has no single definition. It only tells you the water passed through some filter, which is why the comparison hinges on knowing which one.

What a Carbon Filter Actually Does

Since carbon is the most common home filter, start there. The CDC explains that pitcher and refrigerator filters "often use activated carbon filters. Their main purpose is to improve the taste and smell, rather than the safety, of water."

Carbon is good at what it targets and blind to the rest. The Minnesota Department of Health notes that carbon filters "can be used to remove chemicals that give objectionable odors or tastes to water such as hydrogen sulfide... or chlorine," but that "other chemicals, like iron and nitrate, are not attracted to the carbon and are not removed." Because carbon works by adsorbing organic chemicals and chlorine rather than dissolved minerals, a basic carbon filter leaves calcium and magnesium in the water. That is why carbon-filtered water still tastes "mineral" and is not demineralized.

What Distilled Water Is

Distilled water is made by distillation: boiling water to steam and condensing it back, which the University of Nebraska–Lincoln Extension notes can remove "nearly all impurities," up to 99.5%, and inactivates microorganisms. The result has a total dissolved solids level near zero, no minerals, and a flat taste. For the full picture, see what distilled water is. (Note that distilled is one type of purified water; if that's your question, see distilled water vs purified water.)

Know What Your Filter Is Certified For

Because "filtered" is so broad, the practical move is to check what a specific filter is certified to do. Filters are tested against NSF/ANSI standards, and the CDC lists the main ones: Standard 42 (taste and odor), Standard 53 (health-related contaminants), Standard 58 (reverse osmosis), and Standard 62 (distillation).

• A basic carbon pitcher is usually certified to NSF/ANSI 42 for aesthetics (chlorine, taste, odor).
• A carbon block for lead or VOCs carries NSF/ANSI 53 for those health claims.
• A reverse osmosis system is certified to NSF/ANSI 58, with total dissolved solids reduction as its core claim.

The CDC's advice is the rule to live by: "check the product's label for the specific substances the filter can remove. Filters that remove germs often do not remove chemicals, and vice versa." Two filters can both be "filtered water" and do completely different jobs.

Purity, Minerals, and Taste

Put simply: distilled water is far purer than typical filtered water, but that purity cuts both ways.

• Purity: distilled removes nearly everything (~99.5%). A carbon filter removes chlorine, taste, and some chemicals but leaves dissolved solids behind. Reverse osmosis lands in between, removing most dissolved solids including minerals.
• Minerals: carbon-filtered water keeps its calcium and magnesium; distilled (and RO) water has essentially none.
• Taste: carbon filtering improves the taste of tap water by removing chlorine, while distilled water tastes flat because the minerals are gone. Which you prefer is personal.

Which Should You Choose?

Match the water to the job:

• Everyday drinking and better-tasting tap water: a carbon filter is the easy, inexpensive winner. It removes chlorine, improves taste, and keeps the minerals.
• Specific health contaminants (lead, VOCs): use a filter certified to NSF/ANSI 53, or reverse osmosis.
• Nitrate, fluoride, or high dissolved solids: carbon won't remove these; reverse osmosis will. See our reverse osmosis system guide.
• Appliances, batteries, medical, and lab uses: distilled water is the choice, because its lack of minerals prevents scale. If you need it regularly, a home distiller beats buying it by the gallon; see the best water distillers for home.

Disclosure: This article is informational and not personalized medical advice. World Water Reserve may earn a commission from qualifying purchases made through links on this page, at no extra cost to you.

Key Takeaways

• "Filtered water" is a spectrum, not a single thing: a carbon pitcher, an NSF-53 carbon block, and reverse osmosis remove very different amounts.
• Distilled water is fully purified to near-zero minerals; a basic carbon filter mainly improves taste and keeps the minerals.
• Carbon filters remove chlorine, taste, odor, and some chemicals but not iron, nitrate, or dissolved minerals; reverse osmosis removes far more, approaching distilled.
• Check what a filter is certified for: NSF/ANSI 42 (taste/odor), 53 (health contaminants), 58 (reverse osmosis), 62 (distillation).
• Carbon-filtered water keeps minerals and tastes better than tap; distilled tastes flat because the minerals are gone. Both are safe.
• Choose carbon filtering for everyday drinking, reverse osmosis for nitrate/fluoride/TDS, and distilled for appliances and maximum purity.