The document provides an overview of the Texas Commission on Environmental Quality (TCEQ). It discusses that TCEQ is led by three commissioners appointed by the governor and is responsible for rulemaking, permitting, monitoring, investigations, and enforcement related to air quality, water quality, and waste management. TCEQ's mission is to protect human and natural resources while supporting economic development through ensuring clean air, clean water, and safe waste management. The document outlines TCEQ's roles, areas of regulation, types of regional investigations, outcomes of investigations, and assistance available to help entities meet regulatory requirements.