Understanding Bottled Water: How Many Bottles Make a Gallon and Other Key Facts

Despite being a natural resource available at low cost, water has become a significant revenue driver. The bottled water industry in the U.S. is valued at $94 billion, with Americans consuming approximately 15.9 billion gallons in 2022. While tap water usage remains in the hundreds of billions of gallons, bottled water's market share is remarkable, especially considering its price is 10,000 times higher than tap water.

How many bottles do we consume annually? To begin, let’s explore how many bottles of water equal one gallon.

How Many Water Bottles Make Up a Gallon?

A gallon of water contains slightly fewer than eight standard water bottles.

Water bottle sizes differ by brand, but most hold 16.9 fluid ounces. Since one U.S. gallon equals 128 fluid ounces, dividing 128 by 16.9 gives approximately 7.6 bottles per gallon. For a half gallon, the number is around 3.8 bottles.

In 2022, Americans drank 15.9 billion gallons of bottled water, equating to roughly 120 billion individual water bottles.

Proper Storage of Bottled Water

When storing bottled water at home, ensure it is kept at room temperature or cooler, away from direct sunlight and any hazardous substances like gasoline or paint thinners. Avoid storing it in places like garages, which may expose it to harmful chemicals.

According to the International Bottled Water Association, properly stored bottled water remains safe to drink indefinitely. However, the Red Cross advises replacing commercially bottled water every year to ensure freshness.

For tap water stored at home, use only food-grade plastic or glass containers with tight seals. It’s recommended to refresh the supply every six months.

Decoding Bottled Water Labels

The type of water in a bottle can often be determined by its label, as the FDA regulates terms like "spring water" and "purified water." There are six main categories of bottled water, along with several hybrid variations that blend these primary types.

Among the primary bottled water types, purified water is the only one mandated to undergo additional treatment after sourcing or procurement from municipal supplies. Common purification methods include:

Aquafina is a prime example of purified drinking water. It starts as municipal tap water and undergoes the "HydRO-7(tm) purification system" to achieve purity.

Aquafina claims its purified water contains only 4 ppm of total dissolved solids, well below the FDA's limit of 10 ppm for purified water.

By Definition

According to the U.S. Food and Drug Administration (FDA), bottled water is defined as water specifically meant for human consumption, free from added carbonation or flavoring, and packaged in a sanitary, food-grade container.

Regulations Governing Bottled Water

The FDA

The FDA, or U.S. Food and Drug Administration, oversees bottled water as a packaged food product. Its regulations for bottled water are less stringent compared to the EPA's (U.S. Environmental Protection Agency) standards for municipal drinking water.

FDA regulations for bottled water safety begin with the fundamental requirement that all food products, including bottled water, must be packaged in a clean container within a hygienic environment. Beyond these general food safety rules, the FDA enforces specific standards for bottled water.

The water must originate from an approved source, which doesn’t involve FDA inspections to verify safety. Instead, it means the water must come from either a protected natural source, like a spring or artesian well safeguarded against surface water contamination, or a municipal drinking water supply (tap water).

The FDA also regulates bottled water labeling. Companies cannot misrepresent the water’s source, and if the water was sourced from untreated municipal supplies (non-potable at the time of purchase), this must be clearly stated on the label. Any additions, such as fluoride or minerals, must also be disclosed.

Additional FDA regulations set maximum allowable levels for contaminants, including organic (bacteria, viruses, parasites) and inorganic (radon, lead, arsenic) substances. These standards are aligned with EPA tap water requirements but include some variations.

The FDA views bottled water as a low-risk food product for two main reasons: First, the water’s source is inherently protected, reducing exposure to harmful contaminants often found in surface or groundwater; second, there have been no significant cases of bottled water contamination to date.

Bottled water, like tap water, contains contaminants, but testing has not revealed levels that pose health risks. As a result, the FDA does not regulate bottled water as strictly as it does prescription drugs.

In certain areas, FDA regulations for bottled water are more stringent than EPA standards for tap water. For instance, while tap water can contain up to 15 ppb of lead due to its journey through lead pipes, bottled water is limited to 5 ppb. However, EPA standards for tap water are generally more rigorous.

For example, tap water must be completely free of E. coli and fecal coliform bacteria, which can cause illness or indicate disease-causing agents. In contrast, bottled water is permitted to have trace amounts of these contaminants.

Despite this, no confirmed cases of these bacteria have been found in bottled water, supporting the FDA's claim that the risk is minimal. Additionally, while cities must disinfect tap water and test for asbestos and parasites, bottled water companies are not subject to the same FDA requirements.

Beyond federal regulations, which apply only to interstate water distribution, states also regulate the bottled water industry. Many states enforce stricter rules than the FDA, requiring annual licensing and regular inspections of water sources and treatment facilities. However, some states have no regulations for bottled water.

The International Bottled Water Association

The most stringent oversight of the bottled water industry comes from the industry itself, primarily through the International Bottled Water Association (IBWA). The IBWA mandates voluntary self-regulation among its members, who account for roughly 80% of bottled water sales in the U.S.

Members of the IBWA must adhere to the IBWA Model Code, which requires disinfection processes like reverse osmosis, filtration, or distillation for water sourced from municipal supplies. (Water from protected natural sources is exempt from this requirement.)

Additionally, IBWA members undergo unannounced annual facility inspections by third-party organizations. The National Sanitation Foundation (NSF), for example, conducts a voluntary Bottled Water Certification Program, inspecting water sources, plants, and testing for contaminants and container-sealing integrity.

Under-regulation and Common Misconceptions

Although the FDA bans bottled water companies from claiming their product is "safer" or "purer" than other water types, such implications are hard to measure. Regardless, many consumers believe bottled water is healthier than tap water.

Health

In truth, all water is considered healthy as long as it lacks high levels of harmful contaminants, which tap water typically does not contain.

Some bottled waters have lower total dissolved solids compared to tap water, but most experts agree that the levels found in tap water are not detrimental to health. In fact, some argue that higher levels of dissolved solids can be beneficial in certain cases.

Mineral water drinkers often choose it for its higher mineral content, believing it offers health benefits. In this case, mineral water might indeed be healthier than tap water.

Interestingly, many cities add fluoride to their water supplies if natural levels fall below the American Dental Association's recommended range (0.7 to 1.2 ppm) to promote dental health. Consequently, those who avoid tap water might consume less fluoride than those who drink it regularly.

Dentists caution that individuals who exclusively drink bottled water lacking sufficient fluoride (some brands retain or add it post-processing) could face increased dental issues over time.

The health benefits of fluoride-enriched water remain a topic of debate, making "healthiness" a somewhat subjective measure. In contrast, purity is a quantifiable attribute.

Purity

For those prioritizing purity, purified water is an excellent choice. With an industry standard of fewer than 10 ppm of total dissolved solids, it closely resembles pure H2O.

If someone defines "pure" as "safe," the discussion circles back to the healthiness debate. Bottled water sources are usually tested for harmful contaminants once a week, while municipal water supplies undergo hundreds of tests monthly.

Tap water might appear slightly cloudy or have a faint chlorine taste, but according to the Minnesota Department of Health, these are aesthetic traits and do not imply the water is unsafe.

Even purified bottled water isn’t required to be entirely free of contaminants. It only needs to stay below FDA or state-mandated levels for specific contaminants.

Taste

Ultimately, taste becomes the deciding factor. Many bottled water enthusiasts cite taste as their main preference, believing bottled water simply tastes better than tap water. In some instances, this is likely true.

Many cities use chlorine to disinfect tap water, often leaving a noticeable aftertaste. Additionally, tap water in some areas may taste unpleasant due to higher mineral content, even though it remains safe to drink.

Regulatory Concerns

A significant critique of bottled water revolves around federal regulations, or the absence thereof. Critics argue that water bottled for human consumption should be held to the same standards as municipal water, regardless of the FDA's risk assessment.

Another regulatory issue is that FDA rules only apply to bottled water sold across state lines. If a company operates within a single state that lacks bottled water regulations, its products face no oversight unless the company voluntarily follows trade organization guidelines.

Beyond safety regulations and potential consumer misconceptions, the bottled water industry faces another major criticism: its environmental impact, often described as a disaster.

Bottled vs. Filtered

Many people opt for home filtration systems like PUR or Brita to purify tap water. These systems can achieve purity levels comparable to bottled water but are far more cost-effective and environmentally friendly.

Brita states that its priciest filtration setup delivers purified water at approximately 18 cents per gallon, whereas the cheapest bottled water costs around $1 per gallon. However, filter maintenance is crucial—failing to replace filters as recommended can lead to contaminant buildup, potentially making the water less pure than before filtration.

Environmental Impact

Globally, manufacturers produce approximately 600 billion plastic bottles annually. The majority of these bottles are made from polyethylene terephthalate (PET), a plastic derived from crude oil.

Nearly 90% of bottled water containers are discarded as trash or litter rather than being recycled. These bottles can take up to 1,000 years to decompose, potentially releasing toxic chemicals into the soil and contaminating groundwater. This ironic cycle of pollution could one day make bottled water a necessity in the U.S.

Recycling challenges extend beyond low participation rates. Even the roughly 10% of bottles that are recycled do little to counterbalance the energy use and pollution generated during their initial production and transportation.

The diversity of plastic types makes sorting and recycling containers highly complex and costly. Consequently, many U.S. recycling companies avoid processing them. Most plastic bottle recycling occurs overseas, particularly in China, requiring additional energy for transportation.

Even when recycled, plastic bottles are rarely made entirely from recycled materials. A so-called "recycled" bottle typically contains more new plastic than recycled content.

In regions where safe drinking water is scarce, bottled water remains a vital option, despite its environmental impact. Access to clean water is essential for survival.

However, when bottled water is sourced from reliable supplies, branded, and shipped to areas with safe tap water, it raises concerns about exploiting natural resources for profit.

Some communities have observed their wells drying up shortly after bottled-water companies began extracting groundwater nearby.

Proving that bottled water companies are depleting the same water sources as local wells is challenging due to the complexities of aquifer geology. As a result, these issues often remain unresolved outside environmental advocacy circles.