What Corked Wine Is and How to Spot It

Corked wine is wine contaminated by a compound called TCA that makes it taste musty, flat, or like wet cardboard

A corked bottle doesn't mean the cork fell apart or crumbled into your glass. It means the wine inside has been spoiled by TCA (2,4,6-trichloroanisole), a chemical that forms when natural cork comes into contact with certain molds and chlorine-based cleaning products. The contamination happens during cork production or storage, not after you open it at home. Once TCA is present, there's no way to fix it—the wine is undrinkable.

Corked wine affects somewhere between 1 and 5 percent of bottles sealed with natural cork, depending on cork quality and storage conditions. It's one of the most common reasons a bottle tastes wrong, and it's also one of the easiest problems to identify once you know what to look for.

Key Takeaways

• Corked wine tastes musty, damp, or like wet cardboard, and the flavor gets worse as the wine sits in your glass.
• The problem comes from TCA in the cork itself, not from anything you did wrong with storage or handling.
• Screw caps and synthetic corks eliminate cork taint entirely, which is why many winemakers have switched away from natural cork.
• If you buy a corked bottle at a restaurant or wine shop, you can return it or ask for a replacement without cost.
• Smelling the cork after you pull it won't reliably tell you if a bottle is corked—you have to taste the wine.

How to recognize corked wine by taste and smell

The first sign is usually the smell. Open the bottle and smell the cork itself—a corked bottle often has a musty, damp basement smell. Then pour a small amount into a glass and smell the wine. A corked wine smells like wet cardboard, a damp attic, or moldy newspaper. Some people describe it as a wet dog smell or like a basement after rain.

The taste is the real test. Take a sip. Corked wine tastes flat and lifeless, with that same musty or moldy flavor you smelled. The wine may also taste bitter or astringent. The problem usually gets worse as the wine sits in your glass—the musty flavor becomes more pronounced. If you're unsure after the first sip, let the wine sit for a minute and taste it again. Corked wine gets noticeably worse, not better.

The tricky part is that a slightly corked bottle can be hard to spot. You might think the wine just tastes off or that it's a style you don't like. If a wine tastes flat, muted, or like it's missing its fruit flavor, and you smell anything musty or damp, it's probably corked. Trust your nose—if it smells like a basement, it's corked.

Why natural cork is more prone to cork taint than alternatives

Natural cork comes from the bark of cork oak trees, mostly grown in Portugal, Spain, and North Africa. The cork is harvested, dried, and processed before it's cut into bottle stoppers. During this process, mold can grow on the cork, and if chlorine-based cleaning products are used to sterilize the cork, TCA can form. Once TCA is in the cork, it will contaminate any wine it touches.

Screw caps and synthetic corks (made from plastic or composite materials) don't have this problem. They can't develop TCA, so a bottle sealed with a screw cap or synthetic cork will never be corked. Many winemakers, especially in Australia, New Zealand, and increasingly in California, have switched to screw caps specifically to avoid cork taint. Some high-end producers still use natural cork because they believe it allows the wine to age better, but they accept the small risk of cork taint as a trade-off.

Cork producers have improved their methods over the past two decades, and the rate of cork taint has dropped. Better cleaning processes and stricter quality control mean fewer corked bottles reach consumers than in the past. But natural cork will never be completely free of the risk.

What to do if you buy a corked bottle

If you open a bottle at home and realize it's corked, you can return it to the wine shop where you bought it. Bring the bottle and cork with you. Most retailers will replace it with a fresh bottle at no cost, no questions asked. Wine shops expect this—it's a normal part of selling wine. Keep your receipt, but even without one, most places will make it right.

If you're at a restaurant and the wine tastes corked, tell your server or sommelier. Describe what you're tasting: musty, flat, like wet cardboard. A good server will taste it themselves or bring it to the sommelier. If they agree it's corked, they'll replace the bottle or offer you a different wine. You should never pay for a corked bottle at a restaurant. If the staff pushes back or seems unsure, ask to speak to a manager.

Don't feel awkward about sending back a corked bottle. It's not a complaint about your taste or the restaurant's selection—it's a defect in the product. Wine professionals expect this to happen occasionally and know how to handle it.

The difference between corked wine and wine that's just oxidized or old

Corked wine is sometimes confused with oxidized wine or wine that's simply past its prime. They're different problems. Oxidized wine has been exposed to too much air, either because the cork failed over time or because the bottle was stored upright or in a warm place. Oxidized wine tastes flat and brownish, like apple juice or sherry, but it doesn't smell musty. It smells like the wine itself, just duller.

An old wine that's fading tastes thin and weak, but again, it doesn't have that musty basement smell. If you're tasting something that smells and tastes like mold or damp, it's corked. If it smells like the wine itself but tastes flat and tired, it's oxidized or just old.

The key difference: corked wine smells wrong. Oxidized or old wine tastes wrong but smells like wine. If you're in doubt, go with your nose.

Why some wine drinkers prefer screw caps despite the tradition of cork

For decades, natural cork was seen as a mark of quality and tradition. A wine with a cork felt more prestigious than one with a screw cap. That perception is changing, especially among younger wine drinkers and in regions like Australia and New Zealand, where screw caps are now standard even on expensive bottles.

The practical reason is simple: screw caps eliminate cork taint. You never have to worry about opening a bottle and finding it's been ruined by TCA. Screw caps also seal more consistently than cork—they don't dry out or shrink over time. For wines meant to be drunk young, a screw cap is actually the better choice.

Some wine drinkers still prefer cork for wines they plan to age for decades, because cork allows tiny amounts of oxygen to pass through, which some believe helps the wine develop complexity. But for everyday wines and wines meant to be drunk within five years, screw caps are increasingly seen as the smarter option. Many respected winemakers now use screw caps on their best bottles, and the stigma is fading.

How to store wine to prevent cork problems

You can't prevent cork taint—it's a defect in the cork itself, not something that happens during storage. But you can store wine properly to avoid other problems that might make you think a bottle is corked. Store bottles on their side (or upside down) so the wine stays in contact with the cork. This keeps the cork from drying out and shrinking, which can let air in and oxidize the wine.

Keep wine in a cool, dark place. Heat speeds up oxidation and can cause the cork to expand and contract, eventually letting air in. A temperature between 45 and 65 degrees Fahrenheit is ideal. Avoid storing wine in direct sunlight or in a warm kitchen. If you're storing wine for more than a few months, a wine fridge or a cool closet is better than a regular kitchen cabinet.

These steps won't protect you from a corked bottle—that damage is already done at the winery. But they will keep your wine from becoming oxidized or prematurely aged, which are problems you can actually control.

Frequently Asked Questions

Can you get sick from drinking corked wine?

No. Corked wine is not dangerous to your health. TCA is not toxic. The wine simply tastes bad and is unpleasant to drink. You won't get food poisoning or any illness from it—it's just ruined wine.

Does smelling the cork tell you if a bottle is corked?

Not reliably. A musty-smelling cork is a bad sign, but some corked bottles don't smell obviously wrong until you pour and taste the wine. The only way to know for sure is to taste it. Don't judge a bottle by the cork alone.

Can a wine be slightly corked?

Yes. Cork taint exists on a spectrum. Some bottles are so badly corked they're obviously undrinkable. Others are mildly affected—the wine tastes a bit flat or muted, and there's a faint musty note. If you're unsure whether a wine is slightly corked or just not to your taste, let it sit in your glass for a minute. Corked wine gets noticeably worse as it opens up to air.

Are expensive wines more or less likely to be corked?

Price doesn't determine cork quality. An expensive wine with a natural cork can be corked just as easily as a cheap one. In fact, expensive wines are more likely to use natural cork, so they may have a slightly higher statistical risk of cork taint. But the difference is small—between 1 and 5 percent across all cork-sealed bottles.

If I buy wine with a screw cap, can it ever be corked?

No. Screw caps don't have cork, so cork taint is impossible. The wine inside can still be oxidized or spoiled for other reasons, but it cannot be corked. This is one reason many winemakers have switched to screw caps.