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What Is Distilled Water and How Is It Made?

Distilled water is water that has been purified through a process called distillation. This process removes most minerals, chemicals, and other substances that are naturally present in tap water or groundwater. To understand distilled water, it helps to know how it's created.

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The distillation process works by boiling water and collecting the steam that rises from it. When water boils, it turns into vapor and leaves behind minerals, salts, and other dissolved solids. This steam rises into a cooling chamber where it condenses back into liquid water. The result is water that is much purer than what came from the original source. According to the U.S. Geological Survey, typical tap water contains dissolved minerals like calcium, magnesium, and various salts. Distillation removes approximately 95-99% of these dissolved substances.

There are different methods used to create distilled water at a commercial scale. Some facilities use countertop distillers that are small enough for home use, while others use large industrial equipment. The basic principle remains the same: heat, evaporate, and condense. Some manufacturers combine distillation with other filtration methods to achieve even higher purity levels.

It's important to understand what distillation does and does not remove. The process is very effective at removing minerals and most chemicals. However, some volatile organic compounds with low boiling points may not be completely removed. This is why some people use distilled water for specific purposes rather than as their primary drinking water source.

Practical Takeaway: Distilled water is created by boiling water and collecting the condensed steam, which removes most minerals and dissolved solids. Understanding this process helps you determine whether distilled water suits your specific needs.

Common Uses for Distilled Water in Households and Industry

Distilled water has many practical uses beyond drinking. Different industries and households rely on distilled water because its purity makes it suitable for applications where minerals could cause problems.

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In households, distilled water is commonly used in steam irons and humidifiers. Tap water contains minerals that build up inside these appliances over time, reducing their effectiveness and shortening their lifespan. Using distilled water prevents mineral deposits, also called limescale, from accumulating. This extends the life of the appliance and maintains its performance. Many owners of expensive clothing steamers and whole-house humidifiers choose distilled water specifically for this reason.

Car owners often use distilled water in vehicle batteries and cooling systems. Car batteries contain lead plates that can be damaged by minerals in regular water. Distilled water is the recommended choice for topping off battery fluid. Similarly, some cooling systems in vehicles perform better with distilled water because minerals don't corrode the internal components as quickly.

In medical and laboratory settings, distilled water is essential. Hospitals use it to prepare medications and saline solutions. Laboratories use it in experiments where any contamination could skew results. The pharmaceutical industry relies on distilled water meeting strict purity standards for drug manufacturing. According to the U.S. Pharmacopeia, pharmaceutical-grade water must meet specific standards for conductivity and particle content.

Aquarium enthusiasts often use distilled water or deionized water to maintain proper water chemistry for fish and plants. Some people also use distilled water for watering certain houseplants that are sensitive to minerals, particularly orchids and carnivorous plants.

Practical Takeaway: Common household uses include steam irons, humidifiers, and car batteries, while industrial uses span pharmaceuticals, laboratories, and medical facilities. Knowing the specific uses helps you determine if distilled water would benefit your situation.

Health Considerations When Choosing Water for Daily Consumption

The question of whether distilled water is suitable for drinking has generated considerable discussion among health professionals and researchers. Understanding the different perspectives on this topic helps you make informed decisions about your water choices.

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One concern some people raise about distilled water is that it lacks minerals. Tap water and spring water naturally contain minerals like calcium and magnesium that your body needs. A 2020 review in the Journal of Water and Health examined whether demineralized water consumption has negative health effects. The research found that while minerals from water do contribute to daily mineral intake, this is not typically a person's primary source of these minerals. Most minerals in a balanced diet come from foods like dairy products, vegetables, nuts, and whole grains.

The World Health Organization has published findings on this topic. Their research indicates that while mineral content in drinking water varies significantly by region, populations consuming demineralized water for extended periods did not show widespread mineral deficiency problems. However, the WHO notes that water with some mineral content may have certain advantages, particularly for cardiovascular health in some populations.

Health authorities have different perspectives on distilled water consumption. The Mayo Clinic states that distilled water is safe to drink, though they note it tastes bland to some people because of the lack of minerals. The American Dental Association has raised questions about whether very pure water might increase tooth decay risk in some situations, though this remains an area of ongoing research.

Some people with specific health conditions may have particular reasons to consider distilled water. Those with certain kidney conditions or following specific medical diets might benefit from lower mineral content, though this should always be discussed with a healthcare provider. Conversely, people at risk for mineral deficiencies might benefit from water containing minerals.

Practical Takeaway: Distilled water is generally considered safe for drinking, though most of your mineral intake comes from food rather than water. Your choice about distilled water should consider your overall diet, health status, and personal preferences.

Cost Comparison: Distilled Water vs. Other Water Options

Understanding the financial aspects of choosing distilled water helps you make practical decisions about your water consumption. The costs vary significantly depending on your method of obtaining distilled water and your location.

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Purchasing distilled water at retail stores is typically the most expensive option per gallon. As of 2024, grocery stores and supermarkets generally sell distilled water in gallon containers for between $0.99 and $1.99 per gallon, depending on your location and the retailer. If a family were to drink one gallon of distilled water per day, this would cost approximately $365 to $730 per year. For comparison, municipal tap water typically costs households between $1 and $3 per day for all uses, which includes drinking, cooking, bathing, and cleaning.

Investing in a home distiller can reduce costs significantly if you use large quantities of distilled water. Countertop distillers range from $100 to $400 for basic models. These units can produce approximately one to six gallons per day, depending on the model. The cost per gallon for home-distilled water is typically $0.05 to $0.15 when you factor in electricity costs. A home distiller pays for itself within several months if you regularly purchase distilled water for appliances or other uses.

Some people use water filters as a less expensive alternative to full distillation. Pitcher filters cost $20 to $50 upfront and $5 to $10 per replacement filter, reducing mineral content but not to the level of distilled water. Whole-house water treatment systems range from $1,000 to $4,000 installed but serve all water in the home. Water delivery services that bring distilled water to your home typically cost $1.00 to $1.50 per gallon, plus delivery fees.

Geographic location affects prices significantly. Distilled water costs more in rural areas where water quality may require more treatment. Urban areas with abundant water sources may have lower prices due to higher competition among retailers.

Practical Takeaway: Retail distilled water costs about $1 per gallon, making it expensive for daily drinking use. Investing in a home distiller reduces per-gallon costs to about $0.10, making it economical if you use distilled water regularly for appliances or other purposes.

Environmental Impact and Sustainability of Distilled Water Production

Producing distilled water requires energy and resources, creating environmental considerations worth understanding. The sustainability of distilled water varies depending on how it's produced and what energy sources power the process.

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The distillation process is energy-intensive because it requires heating large quantities of water to boiling point. A countertop home distiller typically uses between 800 and 1