We all know we need to drink plenty of water, but that is harder to do when your kitchen faucet tastes like a swimming pool. Maybe you are fighting off flavors, or maybe you are worried about old lead pipes.
The grocery aisle does not make it easier. You see jugs labeled distilled, purified, and spring, and it is not obvious which one belongs in your glass.
So we broke down how distilled, purified, and tap water actually differ, from purity and taste to what each one costs. By the end you will know which to pour for drinking, which to save for your CPAP or iron, and where a simple filter does the job.
Key Takeaways
- Distilled water is boiled into steam and condensed back to liquid, removing nearly all minerals and contaminants and driving total dissolved solids close to zero, which makes it the purest choice for CPAP machines, steam irons, and sensitive health needs.
- Purified water is any water processed below 10 parts per million of dissolved solids, usually by reverse osmosis, deionization, or distillation, giving safe water with a crisp taste.
- Tap water is the cheapest and most convenient option, but its safety and flavor depend on your local utility and home plumbing, and older homes may still have lead service lines.
- Match the water to the job: distilled for CPAPs and irons, purified for everyday drinking, and filtered tap water for a budget-friendly compromise.
Distilled vs. Purified vs. Tap Water
While all three options will keep you hydrated, the source and filtration methods change both the safety profile and the flavor.
Distilled Water
Distilled water is the gold standard for purity, but it gets there through a very specific process. During distillation, water is boiled until it turns into steam.
That steam rises and leaves everything else behind, including minerals, bacteria, and chemicals. The steam is then cooled and condensed back into liquid form in a clean container. It is essentially H2O and nothing else.
Time Management
Benefits of Distilled Water
Here is why many people keep a few jugs of distilled water on hand:
- It offers the highest purity: Distillation kills bacteria and viruses that might survive other filters. Because the water turns to gas, heavy metals and solids cannot tag along. This makes it ideal for medical devices like CPAP machines or Neti pots.
- Removes chlorine and stubborn chemicals: Volatile chemicals and additives like fluoride are effectively separated from the water during the steam phase.
- It protects household appliances: Because it lacks minerals, distilled water prevents scale buildup. Using it in steam irons, humidifiers, and car batteries extends their lifespan.
- Safe for compromised immune systems: If you or a family member has a weakened immune system, you cannot risk the microorganisms found in tap or well water. Distilled water offers peace of mind (1).
Drawbacks of Distilled Water
Before you switch exclusively to distilled water, consider these downsides:
- The taste is flat: Many people find distilled water bland. The minerals that give water its crisp edge, mainly calcium and magnesium, have been removed, and a 2004 World Health Organization review noted that this flat taste can lead people to drink less water overall.
- It strips beneficial minerals: The same review found that relying on demineralized water as your main source lowers your dietary intake of calcium and magnesium. If distilled is all you drink, a mineral-rich diet matters even more.
- Home distillation is slow and energy-intensive: Running an electric distiller for hours adds to your electric bill. It is not an on-demand source like a faucet.
How to Distill Water
You generally have two choices for making this at home: electric countertop units or non-electric manual methods.
Electric Water Distiller
These units look a bit like a large coffee maker. You fill a chamber with tap water and plug it in. A heating element boils the water, and a fan cools the steam, dripping pure water into a carafe.
While convenient, they do generate heat and hum like a fan. You also need to clean the boiling chamber regularly to remove the sludge left behind by your tap water.
Non-Electric Water Distillers
These manual distillers rely on a stove or campfire. They typically use a pot with a specialized lid and condensing tube.
These are excellent for off-grid living or emergency preparedness kits. While they save on electricity, they require more active monitoring to ensure you do not boil the pot dry.
Purified Water
“Purified water” is a broad category. Under the USP standard that the FDA references, water only counts as purified once its total dissolved solids drop below 10 parts per million (2), whether that happens through distillation, reverse osmosis, or deionization.
So distilled water is one kind of purified water, but not all purified water is distilled. Reverse osmosis (RO), ozonation, and deionization all clear the same bar by different routes.
Benefits of Purified Water
Purified water strikes a balance between safety and taste for most households.
- Better taste and smell: Purification targets sulfur, chlorine, and organic matter that cause funky odors. Most people prefer the crisp taste of purified water over distilled water.
- Removes dangerous contaminants: Proper purification removes up to 99% of biological contaminants like Giardia and E. coli, along with chemical runoff. A reverse osmosis system on its own cuts total dissolved solids by roughly 90 to 99 percent.
- Encourages hydration: When water tastes good, you drink more of it. Removing the metallic or swimming-pool taste of tap water makes it easier to hit your daily hydration goals.
Drawbacks of Purified Water
High-quality water comes with a few trade-offs regarding cost and waste.
- Upfront and ongoing costs: Installing a Reverse Osmosis system is expensive, and buying bottled purified water adds up quickly over a year.
- Filter maintenance: You cannot just install it and forget it. You must change filters on schedule, or bacteria can grow inside the system, making the water worse than tap.
- Plastic waste: If you rely on single-use bottled purified water, you are contributing significantly to plastic pollution (3).
How to Purify Water
The method you choose depends on what is currently in your water and how much you want to spend.
Here are the most common ways to get purified water at home:
- Whole house filtration systems: These treat water at the point of entry. This means every tap, shower, and washing machine uses filtered water. It protects your plumbing but is the most expensive option to install.
- Under-sink systems (Reverse Osmosis): These are popular for drinking water. An RO system forces water through a semi-permeable membrane to catch contaminants. Note that RO creates wastewater during the process.
- Water filter pitchers: These are the entry-level option. They use activated carbon to improve taste and remove basic contaminants like chlorine. They are cheap but less effective against heavy metals or bacteria compared to RO.
Tap Water
Tap water is the water that flows directly from your municipal supply or private well. In the US, the EPA regulates public tap water under the Safe Drinking Water Act, while the FDA regulates bottled water as a food. Municipal systems are actually tested more often and must publish their results, though real-world quality still varies drastically by zip code.
Benefits of Using Tap Water
For many people, tap water is perfectly safe and the most logical choice.
- It costs almost nothing: Tap water runs about a fraction of a penny per gallon. Compared to bottled water, the savings are astronomical.
- Instant access: There is no waiting for a distiller to boil or a pitcher to drip. Turn the handle, and you have unlimited water flow.
- Contains beneficial minerals: Hard tap water is often rich in calcium and magnesium. Additionally, most municipal water contains added fluoride for dental health.
Drawbacks of Tap Water
Recent infrastructure failures have made many people wary of the faucet.
- Unknown contamination risks: Even if water leaves the treatment plant clean, it travels through miles of aging pipes. Leaks can introduce bacteria, and old infrastructure can leach sediment.
- Lead pipes: Millions of homes, especially those built before 1986, still have lead service lines or fixtures (4). Lead is a neurotoxin with no known safe level of exposure.
- Inconsistent taste: Seasonal algae blooms or high levels of chlorine treatment can make tap water taste earthy, metallic, or chemical.
Which Water Is Right for You?
If you are struggling to pick a lane, use this quick decision guide:
- Do you use a CPAP or humidifier? You need distilled water. It prevents mineral buildup that can ruin expensive machines.
- Is your tap water unsafe? If you have lead pipes or frequent boil-water advisories, you need a proper purification system (like Reverse Osmosis) or a reliable distiller.
- Do you just hate the taste? A simple carbon filter pitcher or fridge filter is likely enough to remove the chlorine taste without breaking the bank.
