Catalyzes the deamination reaction of hydroxyatrazine to N-isopropylammelide (dihydroxy-isopropyl-atrazine). The enzyme is also capable of catalyzing some dechlorinating reactions. H(+) + H2O + hydroxyatrazine = ethylamine + N-isopropylammelide Binds 1 zinc ion per subunit. Optimum pH is 6.5-7.5. Xenobiotic degradation; atrazine degradation; cyanurate from atrazine: step 2/3. Homodimer. Belongs to the metallo-dependent hydrolases superfamily. ATZ/TRZ family.