Long-term freshwater quality monitoring data for sites in the Peace – Athabasca River Basin for the past 15 years or longer for nutrients, metals, major ions, and other physical-chemical variables are included in this dataset. Monitoring is conducted by Environment and Climate Change Canada (ECCC) as well as through the Joint Oil Sands Monitoring Program, or in collaboration with Parks Canada and the Northwest Territories to assess water quality status and long-term trends, detect emerging issues, establish water quality guidelines and track the effectiveness of remedial measures and regulatory decisions. Most recent data can be downloaded from the following link: http://data.ec.gc.ca/data/substances/monitor/national-long-term-water-quality-monitoring-data/peace-athabasca-river-basin-long-term-water-quality-monitoring-data/