Tap water arrives with dissolved minerals, a disinfectant residual and whatever the plumbing between the plant and your faucet contributed. Distilled water has been boiled and condensed, so it arrives with almost nothing at all. If you are standing in a store deciding whether to keep buying jugs, that difference is worth understanding before you commit to the habit.
What tap water contains and who checks it
Municipal tap water is treated, disinfected and monitored, and every community water system publishes an annual Consumer Confidence Report telling you its source, its disinfectant and what was detected, with the EPA maintaining a finder for those reports. That means you can look up your own supply rather than guess about it. Private wells are a different case entirely, since they are not federally regulated under the Safe Drinking Water Act and nobody tests them unless the owner arranges it.
What distillation takes out
Boiling and condensing separates water from anything that does not travel as vapor, which is minerals, salts, metals and hardness. What comes out is close to pure water and tastes flat for exactly that reason, since the minerals people describe as freshness are gone. Distillation is not selective and cannot be tuned. It is also slow and energy hungry compared with filtration, which is why it is a specialty product rather than a household supply method.
Is buying distilled water actually solving anything
This is the honest question. If you dislike your tap water because of a chlorine taste, an earthy summer smell or hardness, a carbon filter or a reverse osmosis system fixes it at the tap for far less than the running cost of jugs, and you stop carrying anything. If you are worried about a specific contaminant, test first and then buy equipment aimed at that contaminant. Buying distilled water indefinitely is a way of paying repeatedly to avoid a problem you have not identified.
Where distilled water genuinely belongs
Steam irons, some humidifiers, certain medical devices and topping up lead acid batteries are the standard cases, and they are the ones where a manual names distilled water specifically. Those are small, occasional quantities, and a jug from the store is the sensible way to meet them. That is a very different proposition from replacing your drinking supply, and it is the use case the product is really sold for.
The taste question, honestly
People who switch to distilled water often find it flat and slightly odd at first, because taste in water comes largely from its dissolved mineral content. Some come to prefer it, most do not. If taste is the whole reason you are considering the switch, chilling tap water in a covered jug and running it through carbon usually gets you a better result than distilled does. Our page on what state has the best tap water shows how much supplies differ across the country.
Questions people ask about what's the difference between distilled water and tap water
Is distilled water healthier than tap water?
It is not, in any meaningful sense for a person on a normal diet. It carries no minerals, which is neither a benefit nor a problem, and the disinfectant residual in tap water is there to keep it safe on the way to you.
Can I drink distilled water every day?
Yes, it is safe to drink daily. Most people find it flat tasting and expensive compared with treating their own tap water, which is the practical objection rather than a health one.
Does distilled water remove lead from my plumbing problem?
Buying distilled water avoids drinking your tap water, but it does nothing about lead in your plumbing, and you still shower and cook with the supply. Testing and a certified filter address the actual issue.
How do I find out what is in my tap water?
Look up your utility's annual Consumer Confidence Report through the EPA finder if you are on a community system. Well owners have no such report and need to arrange a lab test themselves.