This report presents the results of an analysis of trends in water quality at a set of long-term river monitoring sites in England. The characteristics considered are the concentrations of nutrients (orthophosphate, nitrate, nitrite), ammonia, biochemical oxygen demand (BOD) and selected metals/metalloids (afterwards referred to as metals) – arsenic, cadmium, chromium, copper, lead, nickel and zinc. These are important basic measures of river water quality. The Environment Agency carried out this data analysis in 2024.
