NOWRA - The National Onsite Wastewater Recycling Association, Inc. (NOWRA) was founded in 1991 as a national professional organization to advance and promote the onsite wastewater industry. Texas Water Resources Institute - Serves as a focal point for water-related research at Texas universities, encouraging discussion of statewide issues through meetings and multi-university studies. Includes calendar of events, newsletters, and reports. Greywater - Technical information on characteristics and system designs. Septic Protector - How septic systems function, what causes them to fail, information and products to help prevent them from failing. The Septic System Owner's Manual - A straightforward, easy to understand, non-scholarly book on residential wastewater disposal. How Stuff Works: Sewer and Septic Systems - Illustrated multiple-part explanation of how sewer systems and septic tank systems really work, with related links. Recycling of Greywater - How to process greywater from shower for toilet flushing in a simple and sustainable way. Managing Household Wastewater - Mississippi State University fact sheet on septic tanks and soil absorption systems for household sewage and wastewater. Grey Water Central - Provides definitions, technical information, and regulations, as well as discussing possible applications and system design.