Berger on wine: The effects of the fires on North Coast wine

Dan Berger looks at the ramifications of the October fires on the wines of the North Bay region.|

The devastating fires throughout Northern California’s wine country over the last week hit so many areas of the multi-county region in so many ways that it’s hard to calculate or quantify the magnitude of the losses.

But one thing that was on the mind of winemakers and almost everyone connected to the wine industry was the potential damage from smoke in the wines.

Occurring in the midst of the harvest, the fires that ravaged wineries and vineyards in Napa, Sonoma, Mendocino, and Lake counties created numerous situations that could be expensive problems.

One is that much of the cabernet sauvignon in the North Coast was still on the vines as fires raged, spewing smoke in every direction. Potential smoke taint in wines made from those grapes could make wines that consumers won’t like.

This has occurred several times in the last few years, most notably in 2008 in Mendocino and northern Sonoma counties, where fires left some red wine grapes (which typically are picked later than whites) with a burned aroma that had a detrimental effect on how the wines tasted. And that hurt sales.

One descriptor for some of the 2008 reds came from a winemaker who said tasting smoke-affected reds was like licking an ashtray.

Following that harvest, many winemaking tactics were utilized to try to remove smoke taint from wines made from fire-affected grapes. Various forms of filtration seemed to have promise, but many of the wines still ended up smelling a bit odd.

“Right after filtration, the smoke seemed to be gone, but six months after bottling, the smoke came back,” said one winemaker.

A large amount of 2008 red wines couldn’t be sold under primary brand names. Much of it was sold off in bulk. Other batches were carefully blended with non-smoky wines and ended up in bottles with private labels, which sold at lower prices.

A few wineries even admitted they had a smoked aroma problem. They created “second label” wines and reduced prices for these wines significantly.

One of the problems in dealing with smoke taint is that it can come in various chemical forms, according to Santa Rosa winemaker and wine chemistry instructor Clark Smith. Some forms of smoke taint are radically different from others, he said, so one single treatment may not work for all the smoked wines.

The Australian Wine Research Institute has done most of the world’s important research in this area of smoke taint, and some of its scientific findings have been published in technical papers – but most such research has never been seen in the United States.

“The Australians have had several horrific vineyard fires in the last few years,” said Glenn McGourty, UC Cooperative Extension Viticuluralist for Lake and Mendocino counties. “That sparked most of their research.

“Most of what’s left out there (yet to be picked) is cabernet, and that’s a grape that most winemakers I’ve talked to don’t think will have smoke problems,” he added, speaking of California’s fire-hit regions.

A few smoke-tainted wines may be treated with reverse osmosis systems, winemakers say. But other issues also face many wineries as a result of the fires.

One of the most labor-intensive and costly could well be ash and soot clean-up and other sanitation issues. Winery sanitation is crucial to making wine that is not only sound and free of technical problems but is stable and conforms to prior vintages. And sanitation following firestorms calls for literally hundreds of hours of diligent cleanup.

Two of the best such solutions entail use of ozone cleaning systems and steam generators, but both are very expensive. One iodine-based sanitizing agent, for instance, calls for a minimum of 20 minutes of sparging with boiling water before the process can be considered complete. A shorter sparge time (sprinkling or splashing) runs other risks.

Then there are vineyard problems. Wineries that suffered vine losses will replant, a costly process. It costs roughly $2,000 per acre or more to replant a vineyard, plus at least $1,500 a year for farming costs, and it is about three years before growers can expect a full crop.

Some areas lost trees, roads, or other structures, not to mention the loss of case goods. Some wineries’ white wines were under threat if their power was interrupted. Such wines must remain cool to retain freshness. Electricity also is utilized to keep case goods cool enough to protect wines from heat before it can be shipped to market.

Insurance will cover some winery losses, but inevitably, some losses will not be covered. But even if insurance does cover a loss, reconstruction could take longer than usual and could cost a lot more than expected.

Sonoma County resident Dan Berger publishes “Vintage Experiences,” a weekly wine newsletter. Write to him at He is also co-host of California Wine Country with Steve Jaxon on KSRO Radio, 1350 am.

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