The co nclusions of EFSA following the peer review of the initial risk assessment carried out by the competent authority of the rapporteur Member State, the United Kingdom, for the pesticide active substance terbuthylazine are reported. The co ntext of the peer review was that requested by the European Commission following the submission and e valuation of co nfirmatory data on groundwater me tabolites. The co nclusions were reached on the basis of the e valuation of the representative uses of terbuthylazine as a herbicide on maize and sorghum and taking into account the scientific opinion of the EFSA Panel on Plant Protection Products and their Residues （PPR� on the setting of health‐ba sed reference values for me tabolites of the active substance terbuthylazine. The reliable endpoints co ncluded as being appropriate for use in regulatory risk assessment, derived from the available studies and literature in the dossier peer reviewed, are presented. Co ncerns are identified.

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