Potassium phosphonates is an approved active substance in Great Britian (GB). The active substance degrades in food/feed to give rise to residues of phosphonic acid, as does the approved active substance fosetyl-Al. The MRLs established for the active substance fosetyl-Al also cover potassium phosphonates. The Health and Safety Executive received an application to set a new Maximum Residue Level (MRL) for asparagus. Following assessment, a new MRL for fosetyl-Al has been introduced to accommodate a new authorisation of a plant protection product in GB that contains potassium phosphonates. This raises the MRL for fosetyl-Al in asparagus from 2 mg/kg to 30 mg/kg. The Evaluation Report/ Reasoned Opinion supporting the new MRL is available at the following link: The evaluation of a new MRL for potassium phosphonates in or on asparagus. The residue levels arising in food from the notified use results in consumer exposures below the toxicological reference values. As the residue levels exceed the current MRL in force, a new MRL has been adopted. There are no CXLs for potassium phosphonates on asparagus, nor for fosetyl aluminium (which can include residues arising from the use of potassium phosphonates) on asparagus.