Environment Canada recently shared data collected as part of the Wastewater Systems Effluent Regulations as open data. The released data includes the full dataset from 2013-2017 as well as summary reports for 2016.
Environment and Climate Change Canada (ECCC) developed the Effluent Regulatory Reporting Information System for the owners of wastewater systems subject to the WSER to submit identification reports, on-going effluent monitoring reports, combined sewer overflow reports as well as transitional and temporary authorization applications. The reports are submitted to ECCC to assess compliance with the national effluent quality standards for carbonaceous biochemical oxygen demanding matter and suspended solids. Certain regulatees are also required to submit the results of acute lethality testing.
WSER dataset (2013 to 2017) on Open Government website – contains ID report summary data, monitoring data, acute lethality results and CSO data
EN: https://open.canada.ca/data/en/dataset/9e11e114-ef0d-4814-8d93-24af23716489
FR: https://ouvert.canada.ca/data/fr/dataset/9e11e114-ef0d-4814-8d93-24af23716489
WSER 2016 Annual Report (HTML)
FR: https://www.canada.ca/fr/environnement-changement-climatique/services/eaux-usees/publications/rapports-reglementaires-effluents-rapports-surveillance/resaeu-rapport-annuel-2016-table-des-matieres.html
WSER 2016 Annual Report (PDF)
EN: http://publications.gc.ca/site/eng/9.871652/publication.html
FR: http://publications.gc.ca/site/fra/9.871652/publication.html
Canadian Water and Wastewater Association