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\section*{Methods} The wildfire started on the 31 of July 2014 in the county of Västmanland, located in the central parts of Sweden. The forest fire lasted for 12 days and a total of 14 000 ha were consumed by the fire. During the initial days (31/7 – 3/8) the spreading of the fire were of moderate intensity but during the fourth of august the wind and fire intensity increased which drastically enlarged the fire affected area. Seven streams and ten lakes, larger than 1 ha, located inside the affected area and three lakes adjacent to the area were investigated. Two selected reference streams (Soltorpsbäcken and Säckenbäcken) were located in the same region as the fire affected area. One measured stream (Gärsjöbäcken) is part of the Swedish regional monitoring program (RMÖ) since 1995.  Sampling \section**{Sampling  and chemical analysis analysis}  The first post-fire measurements of the streams were made on the 21 of August (2014). The fire affected area was during this time closed of and the measurements were therefore made outside the bounderies. The measurement location for Gärsjöbäcken was moved to the original place used in the regional monitoring program when the area was accessible. Three of the seven streams (Gärsjöbäcken, Vallsjöbäcken and Myckelmossbäcken) were measured every second to third week, except during the coldest period between 16th of December to the 27th of January. Synoptic measurements were made at 6 occasions during the eleven months after the fire. The lakes were sampled at one occasion on the 28th of October (2014). The water sampling procedure and water chemistry analysis were made according to the Swedish monitoring program (Fölster et al., 2014) using SWEDAC accredited methods at the geochemical laboratory at the Department of Aquatic Sciences and Assessment at the Swedish University of Agricultural Sciences (Sonesten, 2015). The chemical analysis of the regional monitoring program is presented in table X.  Catchment delineation  The catchments of the sampled streams were produced in ArcGIS 10.3, software from ESRI, using a national elevation model from Lantmäteriet (2015a) that had a resolution of 2x2 m and accuracy of 0.5 m. When rain hits the surface it will run in the steepest slope direction which is determined in the elevation model. By grouping the surfaces of the steepest slopes with the same direction watersheds were delineated.