Drinking water treatment plants were historically designed to address a narrow range of water quality parameters and are often unable to easily adapt to changes in source water quality. Utilities need tools to help them better understand and respond to long-term changes in water quality due to lake recovery, climate, and other drivers. This project developed and tested a decision support framework (DSF) for drinking water treatment plants undergoing changes in source water quality. This resulting DSF will help utilities continue to supply high-quality water in an environmentally and economically sustainable manner. Tailored Collaboration Partners: Halifax Water and Tampa Bay Water. Published in 2022.