Marin Sun Farm’s slaughterhouse in Petaluma, the only slaughterhouse in the Bay Area, is now a certified organic facility, an effort to provide an option for local ranchers as well as boost business, the company announced this week. Animals that are raised on organic pastures without antibiotics cannot be labeled organic if they are not processed in a certified facility; now, organic ranchers can send their herds to Petaluma instead of far-flung slaughterhouses in the Central Valley. “The U.S.D.A. Organic Certification of our last remaining Bay Area slaughterhouse completes the necessary, and previously missing, link required in the flow of Certified Organic Livestock from pasture to plate,” David Evans, a fourth-generation rancher in the Point Reyes National Seashore and the founder and C.E.O. The facility can process up to 100 hogs, goats and lambs a day, as well as 50 cattle, but it hasn’t reached those numbers yet. “Our hope is to build volume and get closer to reaching capacity at the slaughterhouse,” said AnnaRae Grabstein, a spokeswoman for Marin Sun Farms. The requirements for organic slaughter, stipulated under the federal National Organic Program, includes specific rules for sanitation and cleaning agents that can be used on tools and carcasses. Rancho Feeding Corporation owned the slaughterhouse until subterfuge around diseased cows and animal inspections led to indictments, a recall of 8.7 million pounds of meat and the facility’s sale early last year.