SACRAMENTO, Calif. — Most people who don’t care for a beer they’ve purchased simply switch brands. Brendan Peacock goes a bit further. He sues. The 37-year-old Sacramento man filed a federal lawsuit last week against Pabst Brewing Co., alleging false advertising in the sales of its Olympia beer products. At issue, which Peacock’s lawsuit says is important enough to be considered a class-action matter covering all drinkers of the beer, is the slogan “It’s the Water.” Peacock’s suit says the beer company falsely implies that the beer comes from artesian spring water in Tumwater, when, in fact, the company brews Olympia in the San Gabriel Valley city of Irwindale, Calif. “It is unclear where the water is actually from,” the lawsuit claims, adding that parts of Irwindale are served by a utility that chlorinates its water and that the area’s water supply “has been contaminated by industrial solvents in the past.” The Olympia website says its beer “blends nature’s finest raw materials from the fields of the Great Northwest into an icon as stunning as the land itself.