In recent years advances in analytical techniques have resulted in the reporting of previously undetectable pesticides in treated drinking water. Most pesticides are traditionally removed using ozone and granular activated carbon, however polar pesticides such as metaldehyde are not effectively removed in this way. Biological treatments for drinking water are a potential option for metaldehyde removal. Experiments were undertaken firstly to understand if metaldehyde can be removed using a biological mechanism and whether this mechanism can be captured and enhanced. It was found that metaldehyde can be effectively degraded using a sand with an active biofilm. This mechanism can be enhanced using a period of acclimation where the biofilm is exposed to higher metaldehyde concentrations to achieve increased degradation rates, this rate is maintained for several days even in the presence of lower metaldehyde levels. Removal times can also be enhanced using a fluidised column, which was found to be more effective that a traditional downflow filter for metaldehyde degradation. Pilot scale experiments demonstrated the potential for this technology to be implemented at full scale. Finally, an economic analysis identified that a fluidised bed bioreactor is economically viable compared to current treatment options.