This paper examines whether exposure to Europeanising practices through work in municipal government in environmental roles positively impacts environmental attitudes. The research focuses on the case of Serbia, a post-communist and post-authoritarian candidate country for European Union (EU) accession. Serbia is selected as a particularly stern test for the transformative power of EU integration for practices and attitudes, including post-materialist environmental attitudes. The study uses an original survey of Serbian municipal officials working on environmental policy (as the treated group) along with a contemporaneous European Values Study of Serbian citizens (as the control group). The outcomes of interest are the battery of items on environmental attitudes that were asked in both surveys. To provide a more accurate causal estimate of municipal socialisation, propensity score matching is used. The analysis is then repeated by excluding officials who started who started working at the municipality before the democratic transition in 2000, to examine whether the findings change. The paper contributes to the extensive research on Europeanisation, socialisation, and eastern enlargement at the national level by investigating whether EU influence on government officials also goes down to the local level and whether these impacts extend to more pro-environmental attitudes.