‘Water management challenges in Croatia and Slovakia in the period 2014-2020‘ is the sixth commentary within the project POLO-Cro28, written by Martina Funduk, senior research assistant at IRMO. This commentary analyses experiences of Croatia and Slovakia in implementation of EU water management legislation and identifies main challenges in the forthcoming period. The paper provides an overview of the conditions of water resources in these two EU member states and envisaged investment in their water management systems by 2020.