This study examines environmental performance measurement and reporting in Swedish municipalities. The environmental reporting in municipalities has become increasingly important as the human impact on the environment has increased and public organizations are expected to take responsibility for reducing their environmental impact. The implementation of New Public Management (NPM) ideas in municipalities has led to an increase in the use of different performance measurements. This study confirms that municipalities with a high NPM-maturity show an increased use of environmental performance indicators. Different measures are used for the environmental indicators which affect the comparability of municipalities environmental reporting. The key factor that explains municipalities use of environmental performance indicators is the level of performance measurements in the organization in general.