Water usage is divided into two main categories: industrial process water and non-contact cooling water. All cooling water cycles are closed-loop systems, whereby the exchanged heat is dissipated by air and evaporation (cooling tower) or by river water as in Visp (CH). As of 2018, sites have been required to report on the water source, water use and water output indicators, to better understand and manage this critical resource.
Industrial water consumption, closely related to production volume, capacity use and product mix, amounted to 6.87 million cubic meters in 2020. The decrease in the water consumption per mio CHF reflects the water-saving initiatives and changes in the product portfolio .
All cooling water networks are separated from any industrial water networks to prevent accidental pollution of water. Total cooling water used by Lonza in 2020 amounts to 149.98 million cubic meters, with Visp accounting for 99%, and the majority returns to water bodies.