WASHINGTON, Sept. 27—With cities responsible for the lion’s share of maintaining quality water and wastewater services, The U.S. Conference of Mayors released today a national survey that examines the status of asset management programs in water and sewer services in major cities. The report was released at the Mayor’s Annual Water Summit in San Francisco and shows how cities use asset management programs, which offer cost-efficient ways to acquire, operate, maintain and rehabilitate water and sewer systems.