The Water Utility Climate Alliance is dedicated to collaborating on climate change issues affecting drinking water utilities. By enhancing climate change research and developing adaptation strategies, water utilities will be positioned to respond to climate change and protect our water supplies. In January 2007, the San Francisco Public Utilities Commission hosted the first national Water Utility Climate Change Summit, which was attended by more than 200 water and wastewater utility executives, government officials, climate change experts and environmental leaders. The purpose of the gathering was to help participants to better understand the impacts of climate change on water-related infrastructure and water resource supplies. Shortly after the summit, the Water Utility Climate Alliance (WUCA) was formed to provide leadership and collaboration on climate change issues affecting the country's water agencies. Comprised of eight of the nation's largest water providers, WUCA members supply drinking water for more than 36 million people throughout the United States. Members include Denver Water, the Metropolitan Water District of Southern California, New York City Department of Environmental Protection, Portland Water Bureau and San Diego County Water Authority, San Francisco Public Utilities Commission, Seattle Public Utilities and Southern Nevada Water Authority.