Mezcal and Tequila: Understanding Distillery Origins and Designations

Mezcal and tequila share a plant, a country, and centuries of tradition — and yet they are governed by entirely separate regulatory frameworks that determine where they can be made, how they must be produced, and what can legally appear on a label sold in the United States. The distinctions matter not just for compliance purposes but for anyone trying to understand what is actually in the bottle. This page covers the geographic designations, production rules, and classification logic that separate these two spirits at the regulatory and craft level.

Definition and scope

Both mezcal and tequila are agave-based spirits produced in Mexico under Denominación de Origen (DO) protections — a geographic indication system that restricts production to specific Mexican states and mandates particular production methods. The difference begins with the plant. Tequila must be made exclusively from Agave tequilana Weber in its blue variety, commonly called blue agave. Mezcal can be made from more than 40 agave species, though Agave angustifolia (espadín) accounts for the majority of commercial production (Consejo Regulador del Mezcal).

Tequila's geographic designation is anchored to the state of Jalisco, with limited authorization extending into parts of Guanajuato, Michoacán, Nayarit, and Tamaulipas — 5 states total (Consejo Regulador del Tequila). Mezcal's DO is broader, covering 9 states: Oaxaca, Guerrero, Durango, San Luis Potosí, Zacatecas, Tamaulipas, Michoacán, Guanajuato, and Puebla (CRM).

For spirits entering the US market, both designations carry legal weight. The Alcohol and Tobacco Tax and Trade Bureau (TTB) recognizes these Mexican DOs under the TTB's international agreement framework, which means a product cannot be labeled tequila or mezcal unless it meets the originating country's standards for those designations.

How it works

The production logic for each spirit diverges at the very first step — cooking the agave heart (piña). Tequila producers steam or oven-cook the piña in industrial autoclaves or traditional brick ovens, then shred and extract the juice mechanically. Mezcal production, particularly at the artisanal and ancestral levels, roasts the piña in underground earthen pits lined with hot rocks and wood or charcoal. That pit-roasting is the source of mezcal's characteristic smoke.

Mexico's Norma Oficial Mexicana NOM-070-SCFI-2016 governs mezcal and establishes three production categories:

  1. Mezcal — allows diffuser extraction and column distillation; the most industrialized category
  2. Artesanal Mezcal — requires pit roasting, milling by tahona or mechanical mill, fermentation in wood or clay vessels, and distillation in copper pot stills or clay pots
  3. Ancestral Mezcal — the strictest category; requires pit roasting, milling by hand tools or tahona, fermentation in animal hides or clay pots, and distillation exclusively in clay pots

Tequila's equivalent standard, NOM-006-SCFI-2012, divides the spirit into two primary categories based on sugar source: 100% agave tequila (all fermentable sugars from blue agave) and mixto tequila (minimum 51% agave sugars, remainder from other sources). Only 100% agave tequila can be aged and labeled Reposado, Añejo, or Extra Añejo. Mixto can be — and often is — bottled outside Mexico, which 100% agave tequila cannot.

Common scenarios

The most practical point of confusion arises at the label. A bottle marked simply "Tequila" with no further qualification is almost certainly mixto. A bottle marked "100% Agave" is the full-agave product. This is not a trivial difference: mixto fermentation uses cane sugar or other adjuncts alongside agave juice, producing a profile that diverges substantially from the pure agave expression.

For mezcal, the label should identify the agave species used — a requirement under NOM-070. A bottle listing only "agave" without species identification fails to meet the standard. Espadín-based mezcals are the most common and generally the most affordable; expressions made from wild-harvested Agave karwinskii (cuishe, madrecuixe) or Agave potatorum (tobalá) command higher prices and represent a smaller portion of total production.

The geographic indications framework creates enforcement asymmetry worth understanding: Mexico's regulatory bodies issue the NOM numbers that appear on bottles, but US import compliance falls under TTB jurisdiction. A product can pass Mexican inspection and still face TTB label rejection if the English-language label does not accurately reflect the Spanish-language certificate of age and origin.

On the international distillery reference index, the broader context of how DO protections interact with US import law is covered across the spirits landscape — tequila and mezcal are among the most litigated and scrutinized categories under that framework.

Decision boundaries

The clearest way to navigate tequila vs. mezcal classification is through a structured set of checkpoints:

  1. Agave species: If the spirit is not made exclusively from blue Agave tequilana Weber, it cannot be tequila — full stop.
  2. Geographic origin: Production outside the 5 authorized tequila states disqualifies a spirit from the tequila designation regardless of agave variety.
  3. NOM number: Every legitimate bottle of tequila or mezcal carries a NOM number linking it to a registered producer. Absence of a NOM number is a significant red flag — a concern covered more fully in the counterfeit and adulterated international spirits reference.
  4. Sugar source: 100% agave vs. mixto is determinative for aging designations in tequila; mezcal has no mixto equivalent — all certified mezcal must derive 100% of fermentable sugars from agave.
  5. Production method: For mezcal, the artisanal vs. ancestral vs. industrial distinction appears on the label and is verifiable against NOM-070 category definitions.

A spirit can simultaneously meet both tequila and mezcal geographic rules (Tamaulipas, Michoacán, and Guanajuato overlap both DOs) — but it cannot be labeled as both. The producer must register under one designation and commit to that production pathway.

References

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