20230419 10414900 1.0 TRUE Quarterly results 2019 The symbology of this layer represents whether the wastewater systems in Canada exceeded the Wastewater Systems Effluent Regulations effluent quality standards according to a quarterly averaging period. Note that a system that exceeded its carbonaceous biochemical oxygen demand (CBOD) limit and/or its suspended solids (SS) limit for at least one quarter (25% of the time) was considered as exceeding the effluent quality standards of the WSER. Environment and Climate Change Canada, ministère de l’Environnement et de la Lutte contre les changements climatiques du Québec and Government of Yukon – Department of Environment