Primary data. The database comprises 15 datasets collected at 15 stormwater and snowmelt runoff monitoring sites across Sweden, covering 182 events from 2000 to 2023. The datasets are presented in an .xlsx format.

The database comprises 15 datasets collected at 15 stormwater and snowmelt runoff monitoring sites across Sweden, covering 182 events from 2000 to 2023, including 117 stormwater and 65 snowmelt events, as well as 40 dry-weather sewer baseflow samples. The database comprises event mean concentration of 20 metal(loid)s (total, dissolved, and bioavailable), key physicochemical parameters including total suspended solids (TSS), total and dissolved organic carbon (TOC and DOC), turbidity (Turb), pH, electrical conductivity (EC) and temperature, as well as rainfall characteristics and runoff flow data.