http://www.cwea.org/
[Accessed: 27.06.2012]
Founded in 1927, CWEA is a not-for-profit association of 9,000-plus professionals in the wastewater industry. They are committed to keeping California's water clean. They train and certify wastewater professionals, disseminate technical information, and promote sound policies to benefit society through protection and enhancement of the water environment. They offer services at the state level as well as locally, through the 17 geographical Local Sections.