What Are The Difference In Swiss and Mountain Water Decaf Coffees?
Decaffeination has come a long way from the days of solvent-heavy processes that stripped beans of flavour along with their caffeine. Decaf coffee beans are very popular and we sell more than you might expect.
Today, the most respected chemical-free methods — Swiss Water and Mountain Water — dominate the specialty coffee world. But while they share the same fundamental science, the differences between them might not be what you thought. Particularly if you care about traceability, transparency, and what actually ends up in your cup.
How Both Processes Work
Both Swiss Water and Mountain Water rely on a similar, elegant chemistry to remove caffeine from coffee. Basically they use a caffeine-saturated solution called Green Coffee Extract (GCE), water, and activated charcoal filters in the process. Green coffee beans are immersed in GCE, which is already loaded with all the soluble compounds found in coffee — except caffeine.
As the GCE is saturated with everything except caffeine, only the caffeine elements migrate out of the beans via osmosis. Caffeine is drawn through the activated charcoal filters and removed. The green beans are then left behind with their flavour compounds largely intact.
It is a genuinely clever system, and when done properly, both methods can produce decaffeinated coffee that retains meaningful origin character. The key question for us is not *how* the process works — it is *whose beans are in the tank*.
The Fundamental Difference: Open System vs Closed System
This is where the conversation gets important for anyone serious about sourcing and knowing what they put in their bodies.
Swiss Water operates what is best described as a ‘closed system’.
The company — Swiss Water Decaffeinated Coffee Inc., based in Burnaby, Canada — undertakes all of the raw coffee sourcing themselves, using their own green coffee criteria.
Coffee roasting brands purchasing Swiss Water decaf are buying from Swiss Water's own inventory of beans. You know the process, but you do not necessarily know the provenance or full traceability of the specific lot before it entered that facility. The origin story for you begins with Swiss Water, not with the farmer or the exporter. They often don't disclose further except for the rarer, higher grade exotic lots.
As specialty coffee roasters, we dislike buying, roasting and selling a product we can't relate to, or provide details about for our valued customers.
Mountain Water, operated by Descamex in Veracruz, Mexico, runs an **open system**. Roasters and importers can send their own lots of green coffee to be processed. That means a roaster can arrange to send raw coffee beans, such as an outstanding single origin from Honduras for example to be decaffeinated.
Mountain Water Decaf coffee beans are then traceable to a specific cooperative, a specific harvest and even a specific set of farmers. Roasters can have *that exact coffee* decaffeinated and returned to them. The identity of the lot is preserved throughout. You as the one who drinks it, can know precisely what you are buying before you order it.
For specialty coffee professionals, this distinction is significant. Traceability is not merely a marketing talking point; it underpins relationships with producers, quality assurance, and the honest representation of a coffee's story. It is part of our relationship to the product. Mountain Water's open system makes that continuity possible in a way that Swiss Water's model simply does not.
We prefer to use Organic certified coffees for Decaf and in this respect Mountain Water generally offers a far more comprehensive range of Organic Decaf coffees.
Comparing Flavour and Quality
Both processes, when applied to high-quality green coffee, can yield excellent results. In our 19 years experience roasting Decaf coffees, it is our opinion that Mountain Water tends to preserve brightness and delicate aromatics slightly better. Results though are always partly a function of the quality of the incoming green coffee, roasting style or profile and tasting skills. So, if you start with an exceptional lot and process it through Mountain Water, then you have the best chance at a genuinely compelling decaf. Not just an acceptable one.
As Mountain Water Decaf has become more easily available from many different Importers, it seems to be a growing commercial preference among informed specialty coffee buyers.
As a roaster of significant decaf coffee volumes, it allows us to experiment, learn and cater to our customer’s feedback. Being focused on quality, Mountain Water is our preferred way we can be involved in ensuring our customers get the best decaf coffee we can feel confident roasting and packaging.
A New Contender: Sugar Cane (Ethyl Acetate) Process
Worth mentioning for completeness is a third chemical-free method gaining real traction: the ‘sugar cane process’. This is also known as the EA (ethyl acetate) decaf process. Here, ethyl acetate — derived naturally from fermented sugar cane molasses — acts as the solvent. The EA bonds selectively with caffeine molecules, drawing them out of the green beans without stripping the broader flavour profile.
The sugar cane process is particularly associated with Colombian coffees, where the necessary raw materials are abundant and the infrastructure to produce EA at scale is well established. Many roasters who have worked with it report that it imparts a subtly sweet, almost fruity quality to the cup. This is seen as complementary to coffees that already lean in that direction. It is not right for every origin, but as a third option alongside Swiss Water and Mountain Water, it is one worth knowing.
Our Final Thoughts
If you are buying decaf from a roaster who specifies Mountain Water process, you are buying from someone who has thought carefully about where their coffee comes from. They have gone to the effort to maintain a chain of custody all the way through the decaffeination process. The open system model is not just a logistical preference; it is an expression of a philosophy that puts the coffee, and the people who grew it and the people who drink it, at the centre.
Swiss Water remains a credible, well-established process, and its certification carries weight in markets where those matters. But for roasters who already invest in relationship-driven sourcing, Mountain Water's open system is the obvious fit. As the market understands this more, it is reflecting that with growing popularity.
The best decaf is simply good coffee with the caffeine removed. Everything else follows from knowing exactly what went in.
