As an industry governed by regulatory standards to deliver safe water and protect environmental health, the challenge is to do so cost-effectively with minimum greenhouse gas (GHG) emissions. While new treatment facilities can be built, a greater focus should be placed on making the legacy of inefficient and non-climate-friendly treatment plants more sustainable and aligned with the goals of Water 2050. Online water quality analyzers will be instrumental in helping existing water treatment facilities meet these goals because of the benefits they offer. Real-time water monitoring helps optimize the treatment process, resulting in less energy and chemical use, and therefore, less GHG emissions.