The use of the Chemcatcher® passive sampler by environment agencies, water supply companies and water conservation trusts in the UK and Ireland has delivered a step-change improvement in water quality information. Specifically, end users have been able to obtain temporal and spatial measurements of problematic and difficult to measure pesticides. This information has been used to develop environmental risk assessments, leading to refined monitoring programmes and better management of river catchments. Environmental management strategies have been implemented that have reduced pesticide usage, improved water quality, reduced water treatment costs and supported enforcement of environmental legislation. Licensing of Chemcatcher® to an SME has generated new international markets, generated commercial income and created new jobs.