Final report of the joint investigation into SSD modelling and ssdtools implementation for the derivation of toxicant guidelines values in Australia and New Zealand

This report summarises the results of the final set of investigations, additional studies, and software fixes prior to the release of ssdtools 2.0 and companion on-line implementation, shinyssdtools. It is intended that the release of ssdtools 2.0 will coincide with its adoption by Australian, New Zealand, and Canadian jurisdictions as the recommended software tool for establishing default guideline values (DGVs) for concentrations of contaminants in natural aquatic systems. This signifies the achievement the collaborative project’s over-riding objective of harmonising the statistical and computational basis of guideline value derivation across all three jurisdictions. In the context of SSD modelling, we believe this is the first time such collaboration and coordination among non-EU countries has occurred.