Rosa Sjerps is a researcher in Chemical Water Quality. She graduated from the VU University Amsterdam in hydrology in 2012. She completed her studies cum laude with a thesis at KWR concerning the presence and behavior of organic micropollutants in the drinking water sources. Since then, Rosa has worked at KWR on the Chemical Water Quality and Health team. In terms of content, she focuses on the origin, behavior and presence of (new) substances in drinking water (sources), such as pesticides and pharmaceuticals. In recent years, Rosa has mainly worked on BTO and advisory projects to signal and prioritise new substances, focusing on monitoring and data analysis of known and unknown substances, e.g. via ‘suspect screening’.