Stream water chemistry from manual grab samples for chemical analysis are taken on a biweekly basis during ice-free conditions, and on a monthly basis in the presence of stream ice for the Krycklan Catchment Study (Svartberget Research Station). The 68 km2 Krycklan catchment encompasses the natural mosaic of boreal landscapes consisting of forests, mires, streams and lakes that make up 70% of the area in Sweden, and which is representative of 30% of the world’s forest cover. Krycklan is an integral part of the Svartberget field research infrastructure, which belongs to the Swedish University of Agricultural Sciences (SLU).