Which organization has the authority to implement rules governing irrigation licensing?

The Texas Commission on Environmental Quality (TCEQ) is the correct organization with the authority to implement rules governing irrigation licensing in Texas. TCEQ oversees the regulation of water resources, water quality, and specific programs related to irrigation practices to ensure they align with environmental protection standards and public health requirements. This includes licensing of irrigation professionals, setting forth guidelines that must be adhered to, and ensuring compliance within the state.

The American Water Works Association (AWWA), Environmental Protection Agency (EPA), and the United States Department of Agriculture (USDA) play significant roles in water management, environmental protection, and agricultural practices, respectively. However, they do not have the direct authority over irrigation licensing in Texas. While the EPA sets forth federal guidelines that may influence state regulations, the enforcement and specific licensing regulations are under the purview of TCEQ, making it the correct choice in this context.