We’re accustomed to vodka producers touting the base ingredients used to make the spirit (single-vintage potatoes! upcycled whey!). They even boast the elaborate distillation and/or filtration methods used in pursuit of pristine quality. And increasingly, vodka-makers are emphasizing the water source used to make, dilute and “finish” their product. But, do these water sources make a difference, or is it marketing, pure and simple?
Among the recent vodkas reviewed for Wine Enthusiast, label highlights included “deep ocean mineral water"; “glacier-fed spring water from Mt. Hood": “Appalachian mountain water"; and “artesian spring water from West Louisiana”. But, what do these really mean? We took a deep dive into the waters to find out.
How Is Water Used in Making Vodka?
For starters, it’s important to know that water is used at least twice in vodka production.
The first step in making vodka is fermentation, explains Tony Abou-Ghanim, author of Vodka Distilled. In this step, water is combined with raw ingredients—whether grain, grape, potato etc., creating a mash. The addition of heat and yeast, which feed on the sugars in the raw materials, induces fermentation.
The fermented mash is then distilled, which concentrates the alcohol. In brief, the mash is poured into a still and heated to a boiling point, so vapors rise. Those vapors are then cooled and condensed into liquid form. After the distiller removes the “heads” and “tails” (removing unwanted impurities), the remaining portion (the “heart”) may be re-distilled (sometimes multiple times, in pursuit of so-called purity and/or neutrality).
At this point, the alcohol level may be as high as 96% alcohol by volume (abv) (192 proof), so a considerable amount of water is added to dilute the concentrated distillate to a palatable level, usually around 40% abv (80 proof).
An important distinction is that the water used in fermentation isn’t always the same as that used to dilute the spirit after distillation. Many producers deliberately select water from a particular source for dilution; some refer to that usage as “finishing” the vodka.
“Most producers insist on using the best quality of water in their vodka,” says Abou-Ghanim. Some use distilled water, or local tap water that has been filtered and purified, he explains. Still, others obtain water from proprietary sources claimed to be free of any pollution to begin with–such as wells, protected reservoirs, springs, lakes, glaciers or pristine mountain run-off.
“Regardless of [the] source, water added to the spirit must be free of minerals, impurities and other contaminants,” Abou-Ghanim notes. “Otherwise all [the] time, money and effort spent producing a quality distillate are wasted.”
How Important Is Water Quality in Vodka?
In general, an estimated 60% of the volume inside a bottle of vodka is water. Based on that percentage alone, water quality is obviously important.
"If that’s terrible water, it will be a terrible product,” warns the head distiller at an Oregon distillery. For example, she warns against using “stale” water that’s been sitting in a tank for days. “Even water in a glass on your night table can taste stale by morning,” she says.
While water quality matters to all spirits, it’s particularly important in making vodka.
“You have no place to hide,” the Oregon distiller explains. “Vodka has such subtle flavor and aroma. If you’re using inferior water, it’s like trying to paint a masterpiece on the back of a burlap sack… All the effort you put into your raw ingredients, all the work and labor you’ve done to create a superior and beautiful product, you throw it all away with a dollar store frame. Your water is extra important not to obscure your work.”
The Flavor Difference
The bottled water industry, which started to take off in the U.S. in the 1970s and 1980s, may have helped jump-start the trend of transparent water sourcing: from Evian to Fiji, many consumers have at least some awareness about where their H2O originates.
“These last couple of generations of consumers have been trained through water marketing to pay more attention to water,” it is noted. “It’s not a new thing to be calling out the integrity of your water source.” More recently, concerns about the impact of climate change have drawn more people to care about the origin and stewardship of their water.
When it comes to vodka, while it may look clear in the bottle, trace amounts of salts and minerals can affect the flavor, aroma and texture of the spirit.
For the longest time, vodka was defined by the [Alcohol and Tobacco Tax and Trade Bureau] as being made from neutral spirits, meaning alcohol devoid of odor, color and taste – which was never really true. There is some character that can be built in, with water acting as a big carrier of flavor for the product.
The pH and mineral salt content can add flavors to vodka. It can also change mouthfeel, and therefore how you perceive the flavors and aromas. For example, acidity can add a puckery feeling, while basic water can create a slippery sensation.
Soft water can open up flavor compounds… The softer the water, the more flavors you get.
"Soft" means it’s relatively free of minerals like magnesium and calcium, but does contain sodium—an important distinction. A pinch of salt enhances flavor, opening up and enhancing the overall flavor experience. Further, the water indirectly adds softness and smoothness.
To create vodka with distinctions, you need water with some character.
