What level of company does the security company of the Third Water Power Bureau belong to?

Special grade for general contracting of water conservancy and hydropower engineering construction. Official website, the Third Engineering Bureau of Water Resources and Hydropower of China, inquired that the company's enterprise qualification level is general contracting of water resources and hydropower engineering construction, engineering design and water conservancy industry, surveying and mapping, housing construction and municipal public works, highway, petrochemical and electromechanical installation engineering, railway, electric power and mine engineering construction.