The Archdiocese of Washington’s decision to drop its foster care program is the first casualty of the District of Columbia’s pending same-sex marriage law that will obligate all outside contractors dealing with the city to recognize gay couples.

Its decision, posted late Tuesday on the archdiocese’s Web site, announced that the archdiocese had ended its 80-year-old program Feb. 1, the day the city’s contract expired with Catholic Charities, the church’s social services arm.

“We regret that our efforts to avoid this outcome were not successful,” Catholic Charities Chief Executive Officer Ed Orzechowski said in a statement. “Foster care has been an important ministry for us for many decades. We worked very hard to be able to continue to provide these services in the District.”

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