The Environment Agency have all their monitoring data available here: https://environment.data.gov.uk/water-quality/view/landing They are endless .csv files which can seem daunting, but actually are fairly straightforward, these can be broken down by time-frame and region, and contain information on concentrations of all of the following… Ammoniacal Nitrogen as NOxygen, Dissolved as O2pHOrthophosphate, reactive as PAlkalinity to … Continue reading Water Chemistry and Quality