French? Italian? Raspberry Vinaigrette? Or perhaps you'd like the house dressing, a bold-yet-subtle perchlorate? Perchlorate, a chemical used in rocket fuel, has been found in substantial quantities on produce in Northern California supermarkets. The water used to irrigate most of the crops comes from the Colorado River, which according to the article is from five to eight parts per billion perchlorate. The source of the perchlorate is the numerous defense contractors and military bases along the Colorado, as well as other industries.

I'm buying Michigan lettuce from now on (Yes, there is Michigan lettuce, and it's very good! Not much available in the winter, however.).