Prof. Mauter directs the Water and Energy Efficiency for the Environment Lab (WE3Lab) with the mission of providing sustainable water supply in a carbon-constrained world through innovation in water treatment technology, optimization of water management practices, and redesign of water policies. Ongoing research efforts include: 1) developing automated, precise, robust, intensified, modular, and electrified (A-PRIME) water desalination technologies to support a circular water economy, 2) addressing the water constraints to deep decarbonization by quantifying the water requirements of energy systems and developing new technologies for high salinity brine treatment, 3) supporting design and enforcement of California agricultural water policy.Recent research efforts have identified technologies and treatment network design for complying with Effluent Limitation Guidelines at steam electric power generation facilities, assessing the technical and economic viability of water desalination for agricultural applications, and managing saline brines from unconventional resource extraction and geological carbon sequestration.