The Links listed here will provide you access to many organizations that are involved in the regulation and treatment of water and wastewater. National Biosolids Partnership Water Environment Federation Association of Metropolitan Sewerage Agencies California Association of Sanitation Agencies California Water Environment Association EPA - Office of Wastewater Management Regional Water Quality Control Board State Water Resources Control Board Department of Health Services Air Pollution Control District of San Diego County Arizona Department of Environmental Quality National Academy of Sciences South Coast Air Quality Management District