How Decaf Coffee Is Made

Every commercial decaf method works on green, unroasted coffee, before the beans ever reach a roaster, because caffeine is far easier to pull out of a raw seed than a roasted one. Three methods account for nearly all of what specialty roasters sell today: the Swiss Water Process, the sugarcane (ethyl acetate) process, and the CO2 process, and Counter Culture Coffee’s own decaf explainer is a rare case of a working roaster naming exactly which one it uses on which lot, rather than just printing “decaf” on the bag.

The Swiss Water Process is the only one of the three that adds no solvent at all: green beans soak in water until caffeine and flavor compounds migrate out together, and that water then passes through a solution called Green Coffee Extract, already saturated with everything except caffeine, so a fresh batch of beans loses only caffeine when it soaks in it next. Mystic Monk’s Water Process Decaf shows what that leaves behind: milk chocolate, roasted almond, and molasses in a 90-point cup with noticeably more body (9) than acidity (7). Roasters marketing the method, including Counter Culture, cite 99.9% caffeine removal, the highest figure any commercial process claims, run out of a single facility in Delta, British Columbia.

Sugarcane decaf uses ethyl acetate, a solvent naturally produced by fermenting sugarcane, which Cafe Imports explains bonds to the salts of chlorogenic acid inside a steamed, pore-opened bean over roughly eight hours of repeated soaking and draining, before a final steaming strips the solvent back out. It targets a lower bar than Swiss Water, commonly cited around 97% removal, but that no longer means a lower ceiling on quality: Frequent Coffee’s Red Bourbon Wilton Benitez Sugarcane Decaf Colombia scored 94 in April 2026, Coffee Review’s highest score ever awarded to a decaf, reading orange blossom, bergamot, and roasted cocoa nib rather than the flat, muted cup decaf still carries a reputation for.

The CO2 process pressurizes pre-soaked green beans in supercritical carbon dioxide that dissolves caffeine selectively while mostly leaving other flavor compounds alone, removing an estimated 95 to 99% of caffeine before the pressure drops and the CO2 evaporates off to be filtered and recycled. It is the method most associated with a smoother, lower-acid cup, since the same solubility that lets it target caffeine also pulls out a share of the acids that give coffee its brightness. None of these percentages are a legal floor everywhere decaf is sold: the EU’s Directive 1999/4/EC sets a hard 0.3% anhydrous-caffeine ceiling for products labeled decaffeinated coffee extract, but no single equivalent number covers roasted beans everywhere. What actually varies more than any method’s removal rate is the green coffee lot underneath it, which is why Coffee Review’s 2026 survey of 86 decaf samples still averaged a respectable 86.3 points, with twelve lots scoring 90 or above.