(a) The department shall be the lead agency for pesticide regulation in Texas. In cooperation with the U.S. Environmental Protection Agency or any federal agency responsible for implementation of federal pesticide law, the department shall:
(1) register pesticides for use in Texas;
(2) adopt lists of state-limited-use pesticides;
(3) provide for training, certification, and licensure of all classes of pesticide applicators;
(4) enforce pesticide laws and regulations governing the safe handling, use, storage, distribution, and disposal of pesticide products; and
(5) adopt rules to carry out the provisions of this chapter.
(b) The Texas Natural Resource Conservation Commission shall have principal authority to regulate and control water pollution. If the United States Environmental Protection Agency adopts a final rule requiring states to implement a state management plan for pesticides in groundwater, the department shall cooperate with the Texas Groundwater Protection Committee in the committee’s development and implementation of federally mandated state management plans for pesticides in groundwater in accordance with § 26.407, Water Code.

(c) The department shall seek advice from the Texas Natural Resource Conservation Commission, the Parks and Wildlife Department, the Texas Department of Health, and the Texas Agricultural Extension Service in reviewing applications for special local need or emergency pesticide registrations. The department shall act expeditiously to review any application for special local need or emergency pesticide registrations.
(d) The department shall give written notice to the Texas Natural Resource Conservation Commission whenever it has probable cause to believe that serious contamination of water has occurred as a result of use, misuse, manufacture, storage, or disposal of pesticides so that the Texas Natural Resource Conservation Commission may proceed with an investigation of a possible violation of the Water Code.
(1) If the Texas Natural Resource Conservation Commission determines that a violation of the Water Code has occurred, the commission shall seek the remedies provided by the Water Code.
(2) If the department determines that a violation of the Agriculture Code has occurred regarding the use, manufacture, storage, or disposal of pesticides, the department shall seek the remedies provided by this code.
(3) The foregoing remedies shall not be mutually exclusive.
(e) The Texas Natural Resource Conservation Commission shall give written notice to the department whenever it has probable cause to believe that serious contamination of water has occurred as a result of the use, misuse, storage, disposal, or manufacture of pesticides so that the department may proceed with an investigation to determine if a violation of the Agriculture Code has occurred.
(1) If the department determines that a violation of the Agriculture Code has occurred, the department shall seek the remedies provided by this code.
(2) If the Texas Natural Resource Conservation Commission determines that a violation of the Water Code has occurred, the Texas Natural Resource Conservation Commission shall seek the remedies provided by the Water Code.
(3) The foregoing remedies shall not be mutually exclusive.
(f) The department shall consult with the Texas Department of Health before denying or canceling a pesticide registration because of a suspected public health threat. The department shall also coordinate enforcement efforts with the department of health when a serious public health threat is suspected.
(g) A regulatory agency may receive grants-in-aid from any federal agency and may enter into cooperative agreements with a federal agency, an agency of this state, a subdivision of this state, or an agency of another state for the purpose of obtaining assistance in the implementation of this chapter.