To account for variable flows, daily loads of AAs were calculated. This allowed for further comparisons between different months e.g., AA seasonality (figure ). Full breakdowns of AA loads in both Bath and Keynsham may be found in the SI for individual points and average monthly loads. In general, AA average loads were higher in Bath than for Keynsham (the difference on average was 88 ± 6 %) which coincides with a larger population. The estimated population equivalent for Bath is ∼5.7 x bigger than compared to Keynsham, which indicates that AA loads are population size driven.