The National Utility Contractors Association (NUCA) is a trade association representing the underground utility industry in the United States. Founded in 1964, NUCA is the largest trade association for this industry in the country. It represents contractors, suppliers, and manufacturers involved in water, sewer, gas, electric, telecommunications, construction site development and excavation sectors of the industry. NUCA is headquartered in Fairfax, Virginia, a suburb of Washington, D.C.