Water quality in the fluvial section Physicochemical and bacteriological parameters–5th edition
Highlights
The physicochemical and bacteriological quality of the water in the St.?Lawrence River was rated “moderate” in 2021–2023, with a third of stations having good water quality. Since 2000, the annual percentage of stations with “good” or “fair” water quality has remained stable, at around 80%. However, persistently high coliform concentrations have limited the overall improvement in the river’s water quality.