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Current regulatory tools are not well suited to address freshwater salinization in urban areas, and the conditions under which bottom-up management is likely to emerge remain unclear. We hypothesize that Elinor Ostrom’s social-ecological systems (SESs) framework can be used to explore how current understanding of salinization might foster or impede its collective management. We focus on the Occoquan Reservoir, a critical urban water supply in Northern Virginia, USA, and use fuzzy cognitive maps (FCMs) to characterize stakeholder understanding of the SES that underpins salinization in the region. Hierarchical clustering of FCMs reveals four stakeholder groups with distinct views on the causes and consequences of salinization, and actions that could be taken to mitigate salinization, including technological, policy, and governance interventions and innovations. Similarities and differences across these four groups, and their degree of concordance with measured or modeled SES components, point to actions that could be taken to catalyze collective management of salinization in the region. 

Background:Programmes that provide scientists and engineers with support to engage in public policy have proliferated in the United States, with many opportunities available for training, networking and placements within government and government-facing organisations. This trend suggests that an evolution may be occurring at the science–policy interface. However, there is little extant data on the structure, aims and impacts of these programmes. Aims and objectives:This study maps the current landscape of US programmes seeking to train researchers at all career stages to engage in policy. We focus on Virginia, a state with a substantial number and diversity of programmes, to assess: (1) how they conceptualise their audiences, activities and impacts; and (2) which roles in policy and types of evidence use they address. Methods:We developed a database of US policy programmes (n=174) and conducted a case study of those in Virginia through surveys and interviews with their leaders (n=12). Findings:The majority (57%) of science policy programmes are state-based. These programmes include student organisations, government placements and fellowships, and academic certificates, degrees, and other trainings. While these reflect diverse models for how to engage researchers in policy, Virginia programme leaders across these categories similarly conceived long-term impacts, audiences and activities, researcher roles in policy, and types of decision-maker evidence use. And they perceived limited ability to implement evidence-based approaches within their programmes. Discussion and conclusion:Building additional programmatic capacity – through shared learning and partnerships – could lend support to this emerging trend in science policy with implications for US research and governance. 

Inland freshwater salinity is rising worldwide, a phenomenon called the freshwater salinization syndrome (FSS). We investigate a potential conflict between managing the FSS and indirect potable reuse, the practice of augmenting water supplies through the addition of highly treated wastewater (reclaimed water) to surface waters and groundwaters. From time-series data collected over 25 years, we quantify the contributions of three salinity sources—a water reclamation facility and two rapidly urbanizing watersheds—to the rising concentration of sodium (a major ion associated with the FSS) in a regionally important drinking-water reservoir in the Mid-Atlantic United States. Sodium mass loading to the reservoir is primarily from watershed runoff during wet weather and reclaimed water during dry weather. Across all timescales evaluated, sodium concentration in the reclaimed water is higher than in outflow from the two watersheds. Sodium in reclaimed water originates from chemicals added during wastewater treatment, industrial and commercial discharges, human excretion and down-drain disposal of drinking water and sodium-rich household products. Thus, numerous opportunities exist to reduce the contribution of indirect potable reuse to sodium pollution at this site, and the FSS more generally. These efforts will require deliberative engagement with a diverse community of watershed stakeholders and careful consideration of the local political, social and environmental context.