S
crewcap, DIAM, and Nomacorc (pictured here) are the three most popular alternative closures in Washington

Below is a tabulation of closure choice and cork taint data from my tastings for Wine Enthusiast in 2018. I have also included data from 2017 and 2016,
previously published. Here are eight takeaways.
1. Natural cork continues to be the most frequently used wine closure
Natural cork closures continue to make up about three quarters of the market in Washington (74.15%). While this number was down slightly from previous years, additional data would be needed to say whether this represents a trend or is just normal variance. Note that in the natural cork category, I include all 1+1 corks and related variants, as well as any agglomerative corks that are not guaranteed to be free of potential taint.
2. Cork taint remains a significant problem with natural cork closures