We hold our suppliers to the same high ethical standards as we do our own business. For that reason, all suppliers are expected to adhere to our Global Sustainability Standards. In accordance with our our procurement processes, all new suppliers are required to be in alignment with our business standards, product quality, process capabilities and commitment to sustainability.
The major categories for which we depend on suppliers are motors, castings, machining, fabrications, electronics and polymerics. These products are composed of metals, plastics and electronic components. They contain raw materials such as stainless steel, aluminum, iron ore and copper. We manage these commodities to ensure that these raw materials come from reputable and qualified sources.
As part of our responsible procurement strategy, Xylem works with local vendors whenever possible. Local suppliers help optimize material flow and reduce costs, without losing the benefits of scale. Our local spend is 68 percent of our total supplier spend.
In 2019, more than 200 suppliers were audited through the Supplier Quality Assessment program, which includes additional sustainability requirements. While sustainability continues to be a part of the Supplier Quality Assessment program, in 2020, we launched a separate Supplier Sustainability Assessment program through which participating suppliers can become preferred suppliers by 2025. The assessment program aims to monitor the social and environmental performance in our supply chain and will focus specifically on the following elements:
The major categories for which we depend on suppliers are motors, castings, fabrications, electronics, poylmerics and machining. These products are composed of plastics and metals such as nickel, copper and aluminum, and we take care to ensure that these materials come from reputable sources.