Water Quality at Monitoring Sites

***IMPORTANT NOTICE*** This item has moved to a new organization and entered Mature Support on May 11th, 2026. This item is scheduled to be Retired and removed from ArcGIS Online on August 31st, 2026. We encourage you to switch to using the item on the new organization as soon as possible to avoid any disruptions within your workflows. If you have any questions, please feel free to leave a comment below or email our Living Atlas Curator ([e-mail]) The new version of this item can be found here The Canadian Environmental Sustainability Indicators (CESI) program provides data and information to track Canada's performance on key environmental sustainability issues. The Water quality in Canadian rivers indicators provide a measure of the ability of river water across Canada to support plants and animals. At each monitoring site, water quality data are compared to water quality guidelines to create a rating for the site. If measured water quality is below the guidelines, it has the ability to maintain a healthy ecosystem. Conversely, water quality is rated poor when measurements are above the guidelines, sometimes by a wide margin. These indicators provide information about the state of surface water quality and its change through time, to support water resource management. The supplementary documentation for the data sources and details on how the data were collected and how the indicator was calculated. The main source Water quality in Canadian rivers – Water quality at monitoring sites, Canada contains more information on data formats, interactive indicator maps, web services and contact information.