Several of the best-selling bottled water brands in the United States start as municipal tap water before being filtered and bottled. Aquafina, Dasani, and Smartwater all draw from public water systems. So do many store brands sold at Costco, Walmart, and other major retailers. The difference between these products and what comes out of your faucet is a purification step, not the original source.
Major Brands That Use Tap Water
Aquafina, made by PepsiCo, is the most well-known example. It’s the single largest bottled water brand in the U.S., and after public pressure, the company changed its labels from the vague abbreviation “P.W.S.” to the full phrase “public water source.” The water goes through a seven-step purification process before bottling, but it begins as ordinary municipal water.
Dasani, Coca-Cola’s flagship water brand, follows a similar model. The company uses reverse osmosis and nanofiltration to strip out impurities, then adds a small amount of mineral salts back in for taste. A Coca-Cola fact sheet notes that this process gives Dasani “a consistent taste wherever they are purchased, regardless of their source,” which is corporate language for: the starting water varies by location because it comes from local tap supplies.
Smartwater, also owned by Coca-Cola, draws mostly from municipal water systems with some sourcing from private wells. It uses vapor distillation (essentially boiling water into steam and condensing it back) followed by the addition of electrolytes. The “glaceau” branding and sleek bottle suggest something exotic, but the water inside starts in the same place as Aquafina and Dasani.
Store Brands Follow the Same Playbook
Costco’s Kirkland Signature purified water is produced by Niagara Bottling, one of the largest water bottling companies in the country. Niagara runs the water through a multi-stage purification process before putting it in Kirkland-labeled bottles. You’re essentially getting Niagara water at a Costco price.
Walmart’s Great Value drinking water and purified water also come from suppliers including Niagara and Premium Waters. The “purified” and “drinking water” labels on these products are a reliable signal that the water originated from a public system rather than a natural spring or aquifer. Sam’s Choice purified water, Walmart’s other house brand, works the same way.
This pattern holds for most grocery store and warehouse club house brands. If the label says “purified water,” the default assumption should be that it started as tap water and was then filtered through reverse osmosis, distillation, or a similar process.
How to Tell From the Label
Texas environmental regulators spell out a useful rule: if bottled water comes from a community water supply, the label must include language like “from a community system” or “from a municipal source.” In practice, most brands use softer phrasing like “public water source” or simply label the product “purified water,” which signals that the water was processed to remove impurities rather than collected from a natural source.
The FDA recognizes several distinct categories of bottled water. The ones that typically indicate a non-tap origin are “spring water” (collected from an underground source that flows naturally to the surface), “mineral water” (containing at least 250 parts per million of dissolved solids from a geologically protected source), and “artesian water” (drawn from a confined aquifer). Brands like Evian, Fiji, and Poland Spring fall into these categories, though their sourcing claims have occasionally drawn scrutiny of their own.
Labels that say “purified,” “distilled,” “deionized,” or “reverse osmosis” all point to water that has been mechanically processed. That processing can start with any source, but for large-scale brands, municipal water is the cheapest and most readily available option.
Does the Source Actually Matter?
Municipal water in the U.S. is regulated by the EPA, which requires frequent testing and public reporting of contaminant levels. Bottled water is regulated by the FDA, which sets similar safety limits but relies more heavily on manufacturers to test their own products. Neither system is perfect, but the starting quality of U.S. tap water is generally high in most regions.
The purification steps these brands apply do remove additional contaminants, chlorine taste, and dissolved minerals that survive municipal treatment. So a bottle of Aquafina isn’t identical to what comes out of your kitchen faucet. It’s the same source water with an extra layer of filtering. Whether that extra filtering is worth $1.50 to $3.00 per bottle depends on your local water quality and your personal preference. A home pitcher filter or faucet-mounted filter applies many of the same techniques (activated carbon, ion exchange) at a fraction of the per-gallon cost.
The key takeaway is straightforward: if you’re buying Aquafina, Dasani, Smartwater, Kirkland purified, or Great Value purified water, you’re paying for filtered tap water in a convenient package. That’s not a scandal. It’s the business model. But it’s worth knowing, especially if you assumed the water came from a mountain spring or a deep aquifer because of the packaging.