As of 2012, these were the twelve member societies of the CEEES:
*Italy: Associazione Italia Tecnici Prove Ambientali (AITPA)
*France: Association pour le Développement des Sciences et Techniques de l'Environnement (ASTE)
*Belgium: Belgian Society of Mechanical and Environmental Engineering (BSMEE)
*Germany: Gesellschaft für Umweltsimulation (GUS)
*Finland: Finnish Society of Environmental Engineering (KOTEL)
*Czech Republic: National Association of Czech Environmental Engineers (NACEI)
*Austria: Österreichische Gesellschaft für Umweltsimulation (ÖGUS)
*Netherlands: PLatform Omgevings Technologie (PLOT)
*United Kingdom: Society of Environmental Engineers (SEE)
*Sweden: Swedish Environmental Engineering Society (SEES)
*Portugal: Sociedade Portuguesa de Simulacao Ambiental e Aveliaca de Riscos (SOPSAR)
*Switzerland: Swiss Society for Environmental Engineering (SSEE)
Each member society successively holds the presidency and the secretariat for a period of two years.