Asked by user in Colorado. Answered by Enjuris Editors.
It is illegal to distill "spirituous liquors" for personal consumption in Colorado without a license (see Colorado Revised Statute § 44-3-101 et al.). Spirituous liquors are defined as:
"Any alcohol beverage obtained by distillation, mixed with water and other substances in solution, and includes among other things brandy, rum, whiskey, gin, powdered alcohol, and every liquid or solid, patented or not, containing at least one-half of one percent alcohol by volume and which is fit for use for beverage purposes."
Home-distilling spirituous liquors for personal consumption without a license is considered a Class 2 Petty Offense, carrying a $250 fine for each offense.
You can learn more about obtaining a license here.