This is a complicated set of data that does not lend itself well to the nature of the questions asked here. Water quality measures and monitoring and surveillance is a multi-jurisdictional responsibility in Canada as the number of fresh water bodies is the highest in the world and these are not all in populated areas.
The data that are assessed are collected for specific sites which are part of the EC Fresh Water Monitoring network. Canada is an incredibly large country with some of the greatest numbers of water sources in the world. It is not possible to have all the water monitored. Therefore sites are monitored where populations and campers have access to. In addition, the jurisdiction for water monitoring is not at the federal level as inland waters are the responsibility of the provinces and the territories and cities. Read here https://ec.gc.ca/eaudouce-freshwater/default.asp?lang=En&n=50947E1B-1 and see the variables list here for one particular site https://aquatic.pyr.ec.gc.ca/webdataonlinenational/en/Measurements/ChooseVariables/Sites/YT08AB0010/Projects/PYLTM/Regions/0 Also see https://www.ec.gc.ca/eaudouce-freshwater/default.asp?lang=En&n=EFDA57C6-1
Different monitoring stations update at different rates. See here https://ec.gc.ca/eaudouce-freshwater/default.asp?lang=En&n=50947E1B-1 and see here https://www.ec.gc.ca/eaudouce-freshwater/default.asp?lang=En&n=EFDA57C6-1
The data must be downloaded by station. This is a massive and complicated database and it does not make sense to download all at once unless one is a scientists and has the database resources to do so. Read here https://ec.gc.ca/eaudouce-freshwater/default.asp?lang=En&n=50947E1B-1 also see https://www.ec.gc.ca/eaudouce-freshwater/default.asp?lang=En&n=EFDA57C6-1
The data is not openly licensed, because only non-commercial re-use allowed (https://ec.gc.ca/default.asp?lang=En&xml=5830C36B-1773-4E3E-AF8C-B21F54633E0A)
The original submission by Tracey P. Lauriault was correct. However, not all data is up-to-date, which is why this parameter was changed. Thank you very much, Tracey P. Lauriault, for contributing to the Global Open Data Index.