The spirits industry uses, on average, 100 litres of water to produce a single litre of alcohol. Marble Distilling Co., a craft distillery in Carbondale, Colorado, uses 1 litre. Not approximately 1 litre. Exactly 1 litre — verified, measured, and certified by Siemens. This is what it means to be the most sustainable distillery on the planet. And this is why that claim is worth scrutinising carefully — because in an industry increasingly plagued by greenwashing, the difference between a marketing claim and a measurable fact matters enormously.
Perched at 6,400 feet in the Roaring Fork Valley, with Mount Sopris standing watch to the south and the Crystal River running cold and clear below, Marble Distilling Co. doesn’t look like a revolution. It looks like a beautifully built Colorado mountain distillery. But inside those walls — beneath the copper stills and alongside the rickhouse barrels — is an engineering system so precise, so complete, and so thoroughly verified that it has no peer anywhere in the American spirits landscape.
The tagline is “Best Taste. Zero Waste.” Four words that most companies would use as aspiration. Here, they’re a measurement.
This post is not a press release. It’s an examination. Over the sections below, we’ll unpack what genuine distillery sustainability actually requires, how much water a conventional operation consumes and why that matters desperately in the American West, how the WETS system works and why Siemens staked its name to verifying it, how to detect greenwashing when you encounter it, why Colorado grain-to-glass is inseparable from the sustainability mission, and how you can visit — or sleep inside — the operation itself. By the end, you’ll know exactly why this claim holds up. And you’ll know how to ask the right questions of any distillery that tries to make the same one.
What Genuine Distillery Sustainability Actually Requires
A truly sustainable distillery measures and minimises water consumption, captures and reuses process energy, sources ingredients locally to reduce supply chain carbon, manages all waste streams productively, and submits to third-party verification — not just voluntary pledges. That is the standard. Everything else is a conversation about degree.
It sounds simple stated that plainly. In practice, it is anything but. The distillation process is inherently resource-intensive: it requires heat to vaporise alcohol, water to cool condensers, and significant energy to maintain consistent temperatures across every production run. For most distilleries, the byproducts of that process — heated water, spent grain, excess thermal energy — are problems to be managed and discharged. The industry has largely treated them as costs of doing business rather than resources to be reclaimed.
What it means to operate as the most sustainable distillery begins with the question of what sustainability actually demands — and then with the willingness to engineer systems that answer every demand simultaneously rather than cherry-picking the convenient ones.
Marble Distilling Co.’s sustainability framework is built around four pillars, each of which addresses a distinct dimension of environmental impact:
- Water recapture and reuse — capturing 100% of process water generated during distillation and cycling it back into production, rather than discharging it to the municipal system.
- Energy efficiency and recapture — harvesting the thermal energy produced as a byproduct of distillation and redirecting it to heat the facility, manage outdoor surfaces, and cool guest spaces.
- Grain sourcing and supply chain — sourcing 100% of production grains from Colorado farms, eliminating the carbon footprint of long-haul ingredient transport and supporting the regional agricultural economy.
- Waste management and circular economy — ensuring that every byproduct of the distillation process — water, heat, spent grain — is productively reused rather than discarded.
The engineering system that addresses all four of these pillars simultaneously is called WETS — the Water Energy Thermal System — and we’ll go deep on how it works in Section 3. But the foundational point is this: Marble did not retrofit sustainability onto an existing operation. When co-founders Connie Baker and Carey Shanks opened the doors in 2015, net zero was not a goal on a roadmap. It was the design specification. The distillery achieved net zero status in the year it opened — something no amount of corporate ESG reporting can replicate after the fact.
What makes this particularly significant in the context of industry leadership is the open-source model. Rather than treating WETS as a proprietary competitive advantage, MDC makes all sustainability data freely available to the wider industry. Craft Spirits Magazine reported that Connie Baker’s explicit hope was that the sustainability report “will assist other distilleries in assessing their own sustainability initiatives,” adding: “We can all learn from each other and hope that with collaboration, the distilling industry can ‘Help to save the planet… one bottle at a time.’”
That posture — sharing the engineering blueprint with competitors — is not a marketing gesture. It is a demonstration that the mission transcends market share. It is also what separates a standard-setter from a brand story.
“Best Taste. Zero Waste.” is not a slogan that was written in a brand workshop. It is a description of an engineering outcome. And that distinction is precisely why it earns the scrutiny this blog gives it.
Having defined what genuine distillery sustainability requires, the next logical question is the one that makes MDC’s achievement so striking — just how much water does a conventional distillery actually consume?
The Water Crisis Hidden Inside Every Bottle of Spirits
Conventional distilleries consume, on average, anywhere from 9 to 100+ litres of water per litre of alcohol produced, depending on scale, spirit category, and production method. For vodka — a category defined by repeated distillation and filtration — the ratio can reach 100:1. SevenFifty Daily’s reporting on distillery water innovation places the industry average at approximately 37 litres per litre of spirit produced across categories. The Scotch Whisky Association has set a target of 12.5 to 25 litres per litre of pure alcohol by 2025 — a figure its member distilleries are actively working toward. Marble Distilling operates at 1:1. That ratio is not an industry target. It is a documented, Siemens-verified operating reality.
To understand what that gap means in practice, consider the annual figures. Marble saves more than 4 million gallons of water every year through its WETS system. To put that in a frame the human mind can grasp: that is roughly equivalent to six Olympic-size swimming pools — conserved annually, by a single small-batch craft distillery in a Colorado mountain town of fewer than 7,000 people.
That statistic is extraordinary on its own. It becomes urgent when you consider where that water would otherwise go — or rather, where it doesn’t go back to.
The Crystal River, from which Marble draws its water, is a tributary of the Roaring Fork River, which feeds into the Colorado River. The Colorado River is one of the most over-allocated river systems in North America — a waterway serving roughly 40 million Americans across seven states and two countries, strained to a degree that has forced federal water managers into emergency allocations, mandatory cuts, and unprecedented negotiation. Lake Mead and Lake Powell, the two largest reservoirs on the Colorado system, have both reached historically low levels within the past decade. Every drop of water saved within the Colorado watershed is not an abstract environmental metric. It is a real gallon that stays in a system serving cities, farms, and ecosystems that are running short.
This is the human and ecological weight behind the 4 million gallon figure. For Marble Distilling, water conservation is not just an operational efficiency. It is an act of geographic responsibility.
The energy picture is equally impressive. Marble’s green code energy rating sits 83% below Carbondale’s own municipal standards — and Carbondale’s standards are already stricter than many comparable municipalities. The distillery uses 20% less energy than other distilleries of comparable size and output. And through the WETS system’s thermal energy recapture function, 1.8 billion BTUs are harvested annually from the distillation process — enough to power approximately 20 homes for a full year, from energy that a conventional distillery would simply release as waste heat into the atmosphere.
The numbers are independently verified. The Siemens case study on Marble Distilling Co. documents every metric above — not as self-reported brand claims, but as third-party, engineering-grade verified data.
This is worth pausing on. In an industry where sustainability claims proliferate like hops in a brewing tank, the presence of independent, documented, engineering-firm verification is genuinely rare. It is what separates a number on a website from a number you can trust.
The numbers are extraordinary — but numbers require a system. The next section opens the hood on the WETS technology that makes every one of these figures possible.
Inside the WETS System: The Engineering That Makes Zero Waste Achievable
The Water Energy Thermal System — WETS — is a proprietary, closed-loop engineering system designed and built by Marble Distilling co-founders Connie Baker and Carey Shanks. Its purpose is both elegant and radical: to capture and productively reuse 100% of both the water and thermal energy generated as byproducts of the distillation process, so that nothing is discharged and nothing is wasted.
This is what “closed-loop” means in practice. In a conventional distillery, the process of heating a wash to vaporise alcohol — and then cooling that vapour back into liquid spirit — generates enormous quantities of heated water and waste heat. That water is typically discharged to the municipal sewer system. That heat is released into the air. The costs are paid; the resources are gone. WETS intercepts both streams before they can leave the building and puts them to work.
Siemens independently documented and verified the WETS system, lending third-party engineering credibility that transforms MDC’s claims from marketing to measurement. Here is exactly how the system operates across its four primary functions:
Hot water storage. Process water heated during distillation is captured in a 5,000-gallon recapture tank rather than being discharged to the municipal system. That stored water is then available for reuse in subsequent production cycles — meaning the same water participates in multiple rounds of distillation before ever leaving the facility.
Facility heating. Excess thermal energy from the distillation process is redirected to heat the entire Marble facility — the working distillery, the tasting room, and the on-site Inn — without reliance on conventional gas or electric heating systems. The stills heat the building. The building’s carbon footprint for space heating approaches zero.
Snow and ice management. When thermal energy production exceeds facility heating needs — as it often does during peak distillation runs — the excess heat is transferred to outdoor surfaces to prevent snow and ice accumulation. In a Colorado mountain town where snow management is a genuine operational concern, this is not a theoretical benefit. It eliminates a problem that most operations solve with energy-consuming electric melt systems or fuel-burning equipment.
Cooling. The inverse of the heating function: excess cold water from condenser cooling operations is repurposed to air-condition both the distillery floor and guest rooms at the Inn during the warmer months. The stills, in effect, run the air conditioning.
What makes WETS remarkable from an engineering standpoint is not any single one of these functions — it is the simultaneity of all four. The system doesn’t solve one problem and create another. It creates a genuine closed loop in which every energy and water input yields a useful output, and every byproduct of one process becomes the feedstock of the next. This is what circular economy thinking looks like when it is built into the architecture of a building, not bolted on as an afterthought.
WETS operates in concert with other sustainability systems. The facility is 65% solar-powered through a combination of passive solar architecture and active solar panel arrays. Spent grain — the protein-rich mash remaining after each production run — is not discarded. It is returned to local ranchers in the Roaring Fork Valley as livestock feed, closing the agricultural loop entirely within the valley.
The result of this integrated approach is the Siemens-verified zero-waste designation — a formal recognition from an independent engineering authority that Marble Distilling Co. operates without waste outputs. Not reduced waste. Not offset waste. Zero waste.
The industry recognition extends further. In December 2021, co-founder Connie Baker was appointed as the first craft distiller to serve on the DISCUS Environmental Sustainability Committee — the national trade body’s highest sustainability advisory body. That appointment is not ceremonial. It reflects the extent to which MDC’s engineering leadership has been recognised as a model for the entire American spirits industry, not just a standout within it.
As Water Education Colorado has documented, MDC’s approach to water management has become a reference point for the broader Colorado water conservation conversation — connecting a craft distillery’s operational choices directly to the health of a regional watershed system.
The WETS system is one of the clearest examples of verified sustainability in action — which raises a harder question: how do consumers tell the difference between a distillery that truly has this infrastructure and one that’s simply borrowing the language of sustainability for marketing purposes?
How to Spot Greenwashing in the Spirits Industry
Greenwashing is not a fringe problem in the spirits industry. It is a structural one — and it is getting worse as sustainability becomes commercially valuable. Research from Drinks Intel found that spirits brands making ESG-related claims averaged 28% cumulative growth compared to 20% for brands that did not make such claims. That is a meaningful commercial premium attached to the appearance of sustainability — creating a powerful incentive to claim it, whether or not the infrastructure to support those claims actually exists.
The regulatory environment is catching up. As The Spirits Business reported in April 2025, UK drinks brands now face formal fines for greenwashing — a signal that what has largely been a consumer trust issue is becoming a legal compliance one. But regulation moves slowly. In the meantime, consumers are largely on their own.
Here is what to look for — and what to push back on — when evaluating a spirits brand’s sustainability claims:
Red Flag 1: Vague language with no underlying data. Phrases like “eco-conscious,” “green practices,” “environmentally responsible,” or “sustainably crafted” without any supporting metrics should trigger immediate skepticism. Real sustainability is quantifiable. What is the water use ratio per litre of spirit produced? What is the energy consumption per case? If a brand cannot — or will not — answer these questions with numbers, the claim is decorative.
Red Flag 2: Single-initiative claims presented as systemic sustainability. A recycled label. One solar panel. A partnership with a tree-planting charity. These are individual gestures, not sustainability systems. Genuine environmental performance is holistic — it touches water, energy, grain sourcing, waste streams, and packaging simultaneously. A brand that leads with one initiative and goes quiet on the rest is telling you something.
Red Flag 3: No third-party verification. Any brand can commission its own sustainability page and populate it with favourable numbers. Verified sustainability involves independent auditing, documented case studies from credible engineering or certification bodies, or formal industry-body recognition. The benchmark in this space is MDC’s verification by Siemens — an engineering firm that staked its own credibility on documenting the WETS system’s performance data. Ask who verified the claim. If the answer is the brand itself, treat the numbers accordingly.
Red Flag 4: Carbon offsets as the primary strategy. Purchasing carbon offsets is categorically different from avoiding or eliminating emissions at source. Offsets can play a legitimate supporting role in a comprehensive strategy — but when they are the strategy, they represent an accounting exercise, not an operational one. Look for distilleries that have reduced or eliminated their environmental impact through engineering and sourcing decisions, not compensated for it downstream through offset purchases.
Red Flag 5: Silence on ingredient sourcing. Where do the grains come from? How far have they travelled? What agricultural practices govern their production? The supply chain carbon footprint of a spirit begins long before the first drop hits a still. A brand that speaks fluently about its production process but goes quiet on ingredient provenance has a story it isn’t telling.
“Real sustainability is not a label. It’s a number you can check.”
Every red flag above has a direct Marble Distilling answer. Measurable, published data: 1:1 water ratio, 83% below energy code, 20% less energy than comparable distilleries. A systemic approach: WETS addresses water, energy, heating, cooling, and waste simultaneously. Siemens third-party verification: an engineering firm, not a brand deck. Impact reduction at source: no offset purchasing, no compensating downstream — zero waste from day one. And 100% Colorado grain-to-glass sourcing: a supply chain that begins and ends within the state.
One of the most powerful and least-discussed dimensions of MDC’s sustainability story is not just what happens inside the distillery — but where the ingredients come from, and why Colorado grain-to-glass is inseparable from the sustainability mission itself.
Why Colorado Grain-to-Glass Makes Sustainable Spirits Possible
There is a phrase in the wine world — terroir — that attempts to capture the way a place expresses itself through a product. The soil, the elevation, the microclimate, the water. For Marble Distilling Co., terroir is not a poetic abstraction. It is a precise, verifiable, and environmentally consequential reality.
Every spirit Marble produces begins with 100% Colorado-grown grains. Not “primarily Colorado.” Not “sourced locally where possible.” One hundred percent. This is a supply chain decision with direct environmental implications: fewer transport miles per ingredient means a dramatically lower carbon footprint per bottle, before a single BTU of thermal energy is applied to a still. In a national spirits landscape where grain sourcing often spans multiple states and thousands of trucking miles, this is a meaningful differentiator — and it is one that compounds with every case sold.
The water that those grains eventually meet inside the distillery is equally specific. The Crystal River originates above 10,000 feet in the Colorado high country, fed by snowpack and filtered through geology that includes — literally — Yule Creek marble. This is not municipal water. It is one of the cleanest water sources in the Colorado mountain system: cold, mineral-rich, and shaped over centuries by the same stone that gave this distillery its name. The Crystal River connects to the Roaring Fork, which feeds the Colorado River — meaning every gallon of water MDC conserves stays within one of the most endangered river systems in North America.
The marble itself plays a role in the spirit. Every Marble product is filtered through crushed Yule Creek marble — the same stone used to build the Lincoln Memorial in Washington, D.C. This geological detail is simultaneously a quality claim and a place claim. The terroir of Carbondale is not background. It is an ingredient. It is in every bottle.
Distillation at 6,400 feet above sea level is not simply a geographic curiosity — it has measurable effects on the distillation process itself. At this elevation, the boiling point of alcohol drops to approximately 202°F compared to 212°F at sea level. That lower boiling point affects how aromatic compounds are captured during distillation — producing spirits with distinct flavor profiles that cannot be replicated at lower altitudes, regardless of grain quality or distiller skill. The elevation is not a marketing claim. It is physics. And it is part of why Marble’s spirits lineup — from its vodka to its whiskeys, gingercello, and moonlight espresso expressions — has earned the recognition it has.
“The place is literally in the bottle.”
After each production run, the spent grain mash — protein-rich, still warm from the stills — does not go to landfill. It is collected and returned to local ranchers in the Roaring Fork Valley for livestock feed. This is the agricultural loop closing within the valley itself: Colorado grain enters the distillery, becomes spirit, and the residual mash feeds the cattle that graze the same landscape where that grain was grown. It is circular economy thinking applied not as a corporate initiative but as a daily operational habit.
The Aspen Times has covered MDC’s community sustainability story in depth — documenting how the distillery functions not just as a business within the Roaring Fork Valley but as part of its agricultural and environmental ecosystem. Local grain sourcing supports local farmers. Spent grain feeds local livestock. Water conservation supports the local watershed. The community sustainability argument is as strong as the environmental one, because in this valley, they are the same argument.
This is what grain-to-glass looks like when it is pursued as a commitment rather than a positioning statement. Not a snapshot of provenance on a label, but an operating model in which the place, the people, the water, and the land are all participants in what ends up in the glass.
All of this — the WETS system, the Colorado grains, the Crystal River water, the Yule Creek marble — is something you can experience in person, because Marble Distilling Co. is a destination as much as it is a brand.
Visiting America’s Most Sustainable Distillery in Colorado
There are distilleries you read about, and distilleries you visit. Marble Distilling Co. is emphatically the latter — because the sustainability story here is not abstract. It is visible, tangible, and present in every corner of the facility. The stills that heat the building. The tanks that store the recovered water. The bar where you can taste the product of a 1:1 water ratio while looking through glass at the copper pot still that produced it. The guest room cooled not by a conventional air conditioning unit but by the same condensate water that passed through the distillation process hours earlier.
Distillery tours give visitors a genuine behind-the-scenes look at the operation — the copper stills, the WETS infrastructure, the marble filtration system, the rickhouse where whiskey ages at high altitude. These are not sanitised showroom tours. They are working distillery tours led by people who understand and believe in what they’re showing you. You leave knowing how the system works, not just what the label says.
Club Marble is the on-site bar where MDC’s award-winning spirits are served as handcrafted cocktails — steps from the stills where they were made. There is something genuinely different about drinking a spirit when the full supply chain is visible from your bar stool: the Colorado grain provenance, the Crystal River water, the Yule Creek marble filtration, the WETS system on the other side of the glass. The cocktail tastes different when you know its story. Or at least, you drink it differently.
The Distillery Inn is, to put it plainly, unlike anything else available to a traveller in Colorado or anywhere else. It is the world’s only boutique inn housed inside a working distillery. Guest rooms are cooled by the WETS system’s excess cold water — meaning the sustainability infrastructure doesn’t stop at the tasting room door. It runs through the walls of the room you sleep in. The copper stills are working on the other side of the building. The spent grain will leave for a local ranch in the morning. And you are, quite literally, inside the most sustainable distillery in America. Sleep With the Stills — the full story of what it means to spend a night in this place — is worth reading before you book.
For those who cannot make the trip to Carbondale, MDC’s virtual tour brings the distillery experience online — stills, barrels, WETS infrastructure, all navigable remotely. It is a meaningful substitute for the distance, if not quite a replacement for standing in the space itself.
Marble Distilling Co. is located at 150 Main Street, Carbondale, Colorado — positioned as a natural destination for visitors to the Roaring Fork Valley, and a gateway to Aspen, Glenwood Springs, and the broader high-country Colorado experience. It is the kind of place that rewards the detour. It is also the kind of place that makes the detour feel necessary.
Visiting Marble Distilling is not simply a tourism experience. It is participation in and active support of a model of distilling that the entire industry needs more of. Every tour booked, every cocktail ordered, every night spent at the Inn, and every bottle purchased is a vote cast for the proposition that quality and responsibility are not in conflict — that the best spirits and the most sustainable spirits can be the same spirits.
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Your Questions About Sustainable Distilling, Answered
Q: What is the most sustainable distillery in the United States?
Marble Distilling Co. in Carbondale, Colorado, achieved net zero status in 2015 — the year it opened — and operates with a 1:1 water use ratio verified by Siemens, compared to an industry average that can reach 100:1. Its proprietary WETS system saves more than 4 million gallons of water annually, and its green code energy rating is 83% below Carbondale’s own standards. No other American distillery has published verified, independently audited sustainability data at this level. The claim is not self-declared — it is third-party documented.
Q: How does Marble Distilling Co. save 4 million gallons of water every year?
Through the WETS — Water Energy Thermal System — a closed-loop water and energy recapture system that captures 100% of the process water generated during distillation and stores it in a 5,000-gallon tank for reuse in subsequent production cycles, rather than discharging it to the municipal system. Combined with the system’s thermal energy recapture and solar energy functions, this achieves a 1:1 water use ratio: one litre of water in for every litre of spirit produced. The system was designed by MDC co-founders Connie Baker and Carey Shanks and independently verified by Siemens.
Q: What does “zero waste” mean for a distillery?
At Marble Distilling, zero waste means every byproduct of the distillation process is productively reused. Water is recaptured in the WETS tank. Thermal energy heats the facility and manages outdoor surfaces. Excess cold water air-conditions the distillery and guest rooms at the Inn. Spent grain is returned to local Roaring Fork Valley ranchers as livestock feed. Solar panels cover 65% of the facility’s energy needs. Nothing goes to landfill. The system has operated at net zero since 2015 — not as a recent achievement, but as a founding design principle. Siemens’ independent documentation confirms the zero-waste designation.
Q: Can I visit Marble Distilling Co. in Carbondale, Colorado?
Yes. Marble Distilling Co. is located at 150 Main Street, Carbondale, Colorado, and offers distillery tours, cocktails at Club Marble, and overnight stays at the on-site Distillery Inn — the world’s only boutique inn housed inside a working distillery. A virtual tour is also available for those exploring from a distance. The distillery sits in the Roaring Fork Valley, conveniently placed for visitors to Aspen, Glenwood Springs, and the broader Colorado high-country region.
Q: What spirits does the most sustainable distillery make?
Marble Distilling produces a full range of award-winning, sustainably crafted spirits — all made with 100% Colorado grains and Crystal River water, filtered through crushed Yule Creek marble. The lineup includes Vodka, Whiskey, Fighting Whiskey, Rye Whiskey, Gingercello, Gingercello Reserve, Moonlight Expresso, and Moonlight Expresso Reserve. Marble Vodka 80 was named the Coolest Thing Made in Colorado in 2022.
The Standard Was Built, Not Declared
The claim “most sustainable distillery in America” is easy to make. What makes Marble Distilling Co. different is that every component of it is traceable to a system, a number, a third-party document, or a verifiable design decision made before the distillery opened its doors in 2015. The 1:1 water ratio exists because the WETS system was engineered to produce it. The net zero status exists because Baker and Shanks built it in from the blueprint, not because it was added to an existing operation when sustainability became commercially fashionable. The 4 million gallons saved each year exists because a 5,000-gallon recapture tank is doing its work every day in Carbondale, Colorado.
“Best Taste. Zero Waste.” was not written by a copywriter. It was built by engineers who believed that the two things consumers should care most about — the quality of what they drink and the cost to the world of making it — should never be in conflict. That belief is now a working distillery. It has been running for over a decade. It has been verified by Siemens. It has been shared openly with the industry. And it sits at 6,400 feet in one of the most beautiful valleys in the American West, waiting for you to taste the difference.
Every bottle purchased is a vote for a model of distilling the entire industry needs more of. Sustainability is not the sacrifice. It is the point.
The most sustainable distillery in America isn’t a future goal. It’s a working distillery in Carbondale, Colorado. And you can taste the difference.
What’s the one thing you look for when deciding if a brand’s sustainability claims are real? Drop it in the comments below — we want to know what matters to you.
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