 The municipal park and the square in front of the town hall were completely renovated in 2007.Groslay falls under the jurisdiction of the civil court of Montmorency, and the business court of Pontoise..The crime rate in Deuil-la-Barre including Montmagny and Groslay was 81.11 per 10,000 people in 2005 and was slightly lower than the national level (83/1000) and the department level (88.15/1000).