Abstract: There is growing evidence of trade-offs and synergies affecting progress towards different Sustainable Development Goals (SDGs), including those aiming to achieve universal access to safe water, sanitation and hygiene (WASH) and reduce environmental impacts from urban solid waste. For example, rapidly changing urban lifestyles have led to growth in packaged water and single-use diaper consumption in global south countries with incomplete household waste service coverage. More recently, the pandemic has highlighted how enforcing greater hygiene created challenges in managing waste from Personal Protective Equipment and hand-washing. Meeting the challenges of increasing access to WASH whilst reducing mismanaged waste requires evidence to inform policy and advocate for redesign of products with large mismanaged waste footprints.  In this seminar, we present evidence from the Water and Waste project, an ongoing ESRC-funded study taking place in off-grid areas of the cities of Greater Accra, Ghana, and Kisumu, Kenya.  We report on three approaches to quantifying mismanaged waste from consumption of products such as bagged or bottled water and single-use disposable diapers.  These three approaches entail analysis of household expenditure surveys, Google Street View imagery, and environmental transect field surveys.  We conclude that all three approaches have value for informing policy, management and advocacy and potential to be scaled up.  However, each approach also has specific limitations and uncertainties.