Ilsa Spa
The Italian headquarters of the company are located in Arzignano, in the province of Vicenza. Built in 1986, they cover a total area of 39,000 sq. m. The headquarters are home to management, administration, three production departments, and the company's Research Centre. Production capacity is 55,000 tons of solid product and 2,500,000 kilograms of liquid product. .

Ilsa Brasil
The Brazilian plant is located in Portao, about 50 km from Porto Alegre. Built in 2008, it covers a total area of 400,000 sq. m. It is home to one production department with a 24,00 ton production capacity for Agrogel. It is the only fertilizer industry that manufactures nitrogen in the state of Rio Grande do Sul .