The police recorded 73.3 crimes per 1,000 people a year in South Merstham from September 2023 to August 2026, about the same as the typical town's 76.2. The most common was violence and sexual offences, at 30.5. In the 12 months to August 2026 it was 72.8, down from 76.9 in the 12 months to August 2024.