The LAX/Metro Transit Center (MTC) case study presentation examines how water influences both indoor air quality and resilience in the form of heat exposure (the Metro system and MTC site’s #1 climate-based risk factor).  The use of recycled water supports an extensive urban oasis in an industrial zone prone to the urban heat island effect. The project highlights water’s essential role in linking resilience and climate adaptation, indoor air quality and health, and resource conservation in drought-prone California.  The project not only addresses what we traditionally think of when we consider water in a sustainability framework – conservation, reuse, and drought mitigation – but also tackles existing ground water contamination and mitigates the ill effects of contaminated water vapor. An additional passive vapor venting system located beneath each building slab further improves indoor air quality.  Built on a remediated brownfield and existing plumes of contaminated groundwater, MTC integrates over 50,000 SF of California native and climate-adapted plantings. These plantings mitigate heat island effects, restore habitat, support pollinators, and reduce irrigation demand by 80% compared to the baseline. Stormwater capture and reuse, chiller water reuse, and connection to the local water utility’s recycled waterline, save over 80,000 gallons per month, eliminating potable water use for irrigation.  Stormwater filters through planted gravel swales, hydrodynamic separators, and five cisterns before being reused for irrigation. An active soil vapor extraction system scrubber purifies existing contaminated ground water and improves local, indoor, outdoor, air and ground water quality.