With challenging compliance requirements set under the Industrial Emissions Directive and the importance of climate action through reducing fugitive methane emissions, water utilities in England and Wales are working across disciplines and geographies to monitor and reduce these emissions. To date the water sector has had little evidence on the magnitude and relevance of emissions of total volatile organic carbon (TVOC) and methane from odour control treatment processes or their efficacy in removing emissions of concern. This paper will share learnings from two projects - with a focus on emissions of methane, TVOC and other GHG emissions from odour control units (OCUs) and the role of OCUs as a potential source of emissions as well as their potential to be part of abatement solutions. The paper will consider emissions from OCUs in context of wider plant emissions based on globally progressive measurement campaigns and best-science emissions data. It will share learnings from multiple measurement methods, including discrete and continuous sampling using lab and site-based methods for OCUs. It will present opportunities and challenges for emissions abatement given industry drivers and the need for decision making which supports a sustainable future.