
273 hotels in United States hold Green Key certification. Each one is audited by an outside body, on a schedule it does not set itself.
Wikimedia CommonsHyatt Regency PhoenixUpscale high-rise hotel in downtown Phoenix, featuring a revolving rooftop restaurant and expansive city views. Offers modern accommodations, a pool aIndependently certified
Wikimedia CommonsCarlsbad Inn Beach ResortCharming beach resort in Carlsbad, featuring European-inspired architecture and a family-friendly atmosphere. Offers comfortable accommodations, lush Independently certified
Wikimedia CommonsWestin Long Beach, CAModern upscale hotel in downtown Long Beach, offering contemporary guest rooms and professional services. Features an outdoor pool, fitness center, anIndependently certified
Wikimedia CommonsHyatt Regency Long BeachUpscale hotel overlooking the Pacific Ocean and the Queen Mary. Offers modern accommodations, a pool, and extensive meeting facilities in a prime wateIndependently certified
Wikimedia CommonsSofitel Los Angeles at Beverly HillsLuxury hotel combining French elegance with Hollywood glamour, located across from the Beverly Center. Features upscale accommodations, an outdoor pooIndependently certified
Wikimedia CommonsHyatt Regency SacramentoUpscale hotel located across from the California State Capitol and Capitol Park. Features modern accommodations, an outdoor pool, and extensive meetinIndependently certified
Wikimedia CommonsHyatt Regency La JollaUpscale hotel located in the La Jolla Village area, featuring a sleek design and professional service. Offers refined accommodations, an outdoor pool,Independently certified
Wikimedia CommonsManchester Grand Hyatt San DiegoIconic waterfront hotel in downtown San Diego, comprised of two landmark towers. Offers upscale guest rooms with bay views, multiple swimming pools, aIndependently certified
Wikimedia CommonsFairmont San FranciscoHistoric luxury hotel atop Nob Hill, offering spectacular views of the city and the bay. Features ornate architecture, elegant guest rooms, and world-Independently certified
Wikimedia CommonsArgonaut HotelEco-friendly boutique hotel located in Fisherman's Wharf, featuring a nautical-inspired design and historic brick architecture. Offers contemporary roIndependently certified
Wikimedia CommonsHyatt Regency Santa ClaraUpscale hotel located adjacent to the Santa Clara Convention Center and California's Great America. Features contemporary accommodations, extensive meIndependently certifiedGreen Key audits a hotel against roughly 100 criteria, some mandatory and some scored, covering water and energy use, waste separation, cleaning chemicals, food sourcing and staff training. A hotel applies, documents each criterion, and is then visited on site. Certification runs for one year, so a hotel keeps it only by re-submitting evidence and passing another visit. It is the largest scheme in this catalogue and the one you will meet most often across Europe.
Green Key measures management practice, not carbon. A large hotel with a pool and air conditioning can hold the certificate while using far more energy per guest than an uncertified guesthouse down the road — it is being judged on whether it manages its resources deliberately, not on the size of its footprint. The scoring is also weighted towards documentation, so a hotel with good records can outscore one that quietly does better.