Numerous studies have already focused on Arctic permafrost deposits with well preserved remains of palaeo-indicative fossils. Freshwater ostracods were just recently introduced as a new proxy for the permafrost palaeo-archive. In order to apply modern data to the fossil record we studied the present-day relationships between the environmental setting and the geochemical properties (element ratios and stable isotopes) of host waters and ostracods from Arctic periglacial environments in the Lena River Delta (Laptev Sea). Our results strengthen the value of freshwater ostracods as palaeoindicators from permafrost deposits.