Winery Lees Are a Mixture: Why Waste Volume and Recoverable Wine Differ
By Matthew Martinez, Founder, CEO & Managing Broker, Diamond Real Estate Group. California DRE #01869679.
A tank of lees is neither entirely waste solids nor entirely recoverable wine. It is a mixture. That makes lees handling a useful place to examine the relationship among production yield, equipment capacity and disposal cost when assessing a Napa or Sonoma winery business.
The production method influences the mixture
An Australian Wine Research Institute article on minimizing and recovering winery lees reports different juice-lees fractions under different clarification systems at several large wineries. At one winery, the fraction was 16% with cold settling and 7% with flotation. Other sites used different combinations of centrifugation, settling and flotation.
Those 2016 observations are not a universal equipment performance guarantee. The article itself discusses differences in incoming solids and upstream pressing. Its important lesson for an owner is that the amount of liquid retained with solids depends on the whole process, not only on the final recovery machine.
Separate quantity, recoverability and destination
Suppose a hypothetical production lot creates 1,000 gallons of lees mixture. A recovery process produces 600 gallons of clarified liquid. The recovery is 60% of the mixture volume, not 60% of the original grape input and not necessarily 600 gallons of finished, bottle-ready wine.
If only 500 gallons are suitable for the intended product after additional handling and evaluation, that is the relevant volume for that product’s economics. The remaining material may have a different use, lower value or disposal cost. Applying the winery’s highest retail price to all 600 gallons would confuse a process output with a finished commercial result.
Even the 500-gallon figure needs a counterfactual. If an existing low-cost process would already recover 400 suitable gallons, the new equipment adds 100 gallons in this example. It should not receive credit for recovering all 500. That distinction can completely change the apparent payback period.
A volume balance should also describe the residual material, so an attractive recovered-volume figure does not hide an unexplained loss elsewhere.
The investment affects more than yield
Additional recovery can require operator time, cleaning, utilities, consumables, storage and movement between vessels. It may reduce disposal volume while creating a more concentrated residual stream. Those effects can move in different directions: less liquid to haul does not automatically mean proportionately less treatment work.
For a small winery, annual utilization can be decisive. Equipment with a strong recovery result during a short harvest period may sit idle for much of the year. A shared or contracted service may offer a different cost structure, but its scheduling needs to fit the point in production when the mixture is available. The choice concerns both the process and the business that will use it.
This kind of analysis is especially helpful where a seller presents improved cellar yield as a major source of future profit. A persuasive explanation follows the material from incoming lot through recovery, quality destination and actual sale, then subtracts the additional costs. It also identifies whether the claimed improvement has already occurred or remains a proposed operating change.
Our guides to winery production facilities and winery wastewater connect these questions with the wider physical property. For readers exploring real estate and home for sale in Napa, cellar yield is one example of how operating details can influence business value.
Contact Diamond Group Estates to discuss the relationship between winery assets and production economics.
Source reviewed October 28, 2026. Research figures describe published Australian observations from 2016. Recovery and valuation examples are hypothetical and do not establish product suitability or equipment performance at a California winery.
