statutory duty
noun[U]
LAWukusthelawsthat acompany, agovernmentorganization, or themembersof aparticularprofessionmustobey:
Bychargingsuch highpricesforelectricity, thecompanywasfoundtobe inbreachofstatutoryduty.
Hospitals have astatutorydutyofcaretowardspatients, and in thiscasetheyfailedin thatduty.