Using S and Pb isotope ratios to trace leaching of toxic substances from an acid-impacted industrial-waste landfill (Pozdatky, Czech Republic)

► S and Pb isotopes are useful tracers of polluted groundwater movement. ► Large ranges of found δ34S and 206Pb/207Pb ratios made source apportionment robust. ► δ34S values higher than 6.5 permil indicated contamination. ► Pb in stream sediment recorded landfill leaks, but was insensitive to air pollution. ► The front of polluted groundwater plume in fractured plutonic rocks spread unevenly.