Del Pepper was first elected to the City Council in 1985. She served as Vice Mayor from 1996 to 1997, from 2003 to 2006, and from 2007 to 2009. Pepper co-chairs the Beauregard Street Corridor Task Force, the Alexandria-Arlington Task Force on the Waste-To-Energy Plant and the Welfare Reform Committee (Alexandria Works!). She is active with the Commission on Aging, Commission on Information Technology, Facilities Naming Committee, and the Council of Governments Air Quality Committee and Board of Directors. She was recently elected Corporate President of the COG. She is a member of the Northern Virginia Regional Commission, where she also chairs the Regional Resources Committee.
Councilwoman Pepper serves on the Boards of the YMCA, the T.C. Williams PTSA, the Alexandria Arts Forum, Bienvenidos, and the Retired Senior Volunteer Program. She is a former first vice president of the local NAACP and former board member of the City's Community Services Board. Other affiliations include the Urban League, the League of Women Voters, and the Sierra Club. She is a recipient of the Jaycees Appreciation Award, the Council of Senior Citizens Organization's Outstanding Women of Alexandria Award, and the Commission for Women's Living Legend Award. Pepper is a Grinnell College graduate. A resident of the City's west end, she and her husband, Dr. F.J. Pepper, have one son.