The Texas Water Development Board (TWDB), of which Region L is a member, asks each region to perform residential water usage planning for the counties and water user groups (WUG) in their district as part of an overall statewide planning and reporting system. Planning documents utilize population projections calculated under the auspices of the State Demographer of Texas and the Texas State Data Center. Documents and information pertaining to water planning and related factors and processes are available at the level of each region and from the Texas Water Development Board. One of the factors involved in planning is the identification of population numbers and another is the projection of population for the planning period. Water usage demands for the future are assessed from the projected population numbers. Activities such as water supply development and treatment, usage, and other management processes require an understanding of who, where, why, and from what, water resources are acquired and used. Identified residential populations play a large part toward this understanding.