A number of businesses have joined the National Service Alliance (NSA), a group purchasing organization located in Charlotte, North Carolina, according to statements made to the press.

Top-Flight Maintenance and WCSD Executive Services both joined in the first half of September. WCSD Executive Services of Coconut, Florida, provides corporate cleaning, post-construction cleaning and window cleaning services. Top-Flight Maintenance provides janitorial services, window washing, snow removal, parking lot maintenance, and landscape work in Fort Collins and Loveland, Colorado, as well as in Cheyenne, Wyoming.

HES Facilities Management joined NSA in late September. It provides cleaning and facility services for schools and colleges.

Master Clean joined NSA in October. The company provides commercial cleaning services in central Ohio.