We are excited to announce that the water isotope and water tracking capabilities are coming back to CESM, supported by a collaborative grant from the NSF Cyberinfrastructure for Sustained Scientific Innovation (CSSI) program. The SCI-SWIM project (Sustainable Community Infrastructure for Stable Water Isotope Modeling Enabling Earth System Research) will deliver a modernized, next-generation isotope-enabled CESM version 3 (iCESM3) to the scientific community.