In accordance with Article 6 of Regulation (EC) No 396/2005, the evaluating Member State, the United Kingdom, received an application from UK Horticultural Development Company to modify the existing maximum residue level (MRL) for the active substance pendimethalin in lettuce. In order to accommodate for the intended use of pendimethalin, UK proposed to raise the existing MRL from the limit of quantification to 0.15 mg/kg. According to EFSA, data are sufficient to derive an MRL proposal of 0.1 mg/kg to support the use of pendimethalin on lettuce. Adequate analytical enforcement methods are available to control the residues of pendimethalin in lettuce at the validated LOQ of 0.05 mg/kg. Based on the risk assessment results, EFSA concludes that the proposed use of pendimethalin on lettuce will not result in a consumer exposure exceeding the toxicological reference value and therefore is unlikely to pose a consumer health risk.