Peatlands play numerous roles in surface hydrology. However, the hydrological links between peatlands and groundwater (aquifers) remain poorly understood, making it difficult to identify areas of interaction. This project aimed to identify plant species and plant species combinations that could serve as indicators of water exchange between peatlands and aquifers. Piezometric and floristic inventories were conducted in 9 peatlands located in the Centre-du-Québec and Abitibi-Témiscamingue regions (Québec). Water exchange between peatlands and aquifers was identified using hydraulic loads, and indicator species were identified using the IndVal index. The study identified 2 indicator species (Carex limosa and Sphagnum russowii) and 4 species combinations that could be used as indicators of a contribution of groundwater to a given peatland. These indicator species and species groups potentially offer a rapid and inexpensive tool for predicting areas of interactions between peatlands and aquifers.