Which of the following state agencies is not involved in pesticide regulation?

The Texas Agriculture Extension Service is primarily focused on education and outreach related to agriculture and natural resources rather than pesticide regulation. This agency provides research-based information, resources, and support to farmers and the public about agricultural practices, including pest management strategies, but it does not have a direct role in the regulatory processes governing pesticides.

In contrast, the Texas Department of Agriculture and the Texas Structural Pest Control Service are directly involved in regulating pesticide use, ensuring compliance with safety standards, and overseeing licensing for applicators. The Texas Water Commission, now part of the Texas Commission on Environmental Quality, also plays a role in pesticide regulation by addressing the impact of pesticides on water quality.

Overall, while all the agencies have important roles in agriculture and environmental health, the Texas Agriculture Extension Service is not a regulatory body specifically involved in the oversight of pesticides.