Inadequately treated waste and wastewater contains a large variety of anthropogenic chemicals originating from commercial and household activities that may be harmful for the environment, as well as human health. In addition, the risk of human exposure to pathogens through inappropriately treated wastewater may pose a health risk, which may be scaled up by development of antibiotic resistance in the local microbial communities exposed to pharmaceutical residues at high concentration levels. Finally, presence of excessive levels of organics and nutrients (N and P) in wastewater effluents may lead to unwanted eutrophication of receiving water bodies, resulting loss of traditional fishing and shell-fish harvesting areas. As the climate changes, these effects may all scale up. Conventional treatment technologies are rarely directly transferable to small, remote Arctic communities for a number of reasons, such as scale, climate and socio-economic realities. Therefore technology development and specific guideline development is taking place these years. These matters were discussed at two previous conferences: Sanitation in Cold Climate Regions which took place Sisimiut, Greenland 12th-14th of April 2016, and Water Innovations for Healthy Arctic Homes held in Anchorage, Alaska 18th-20th of September 2016. Both conferences were integrated into the Arctic water, sewer and health (WASH) initiative of the Arctic Council’s Sustainable Development Working Group. In this session, the recently established Thematic Network “Arctic WASH” follow up on the two previous meetings by inviting researchers from the circumpolar region to present their recent results and join the discussions.