Combined Sewer Overflow volumes from wastewater systems subject to the Wastewater Systems Effluent Regulations

The Wastewater Systems Effluent Regulations (WSER), developed under the Fisheries Act, came into force in 2012 to manage wastewater releases by systems that collect an average daily influent volume of 100 cubic metres or more. The WSER also does not apply to any wastewater system located in the Northwest Territories, Nunavut and north of the 54th parallel in the provinces of Quebec and Newfoundland and Labrador. The WSER set national baseline effluent quality standards that are achievable through secondary wastewater treatment.

The WSER require owners or operators of wastewater systems with combined sewers to submit an annual report on the total volume and the number of days wastewater is discharged per month via combined sewer overflow (CSO) points as a result of precipitation.

The map below shows the volume of effluent (in cubic metres) discharged in a year from all CSO points situated within the collection area of a wastewater system. For the most part, the volumes provided to ECCC are estimates.

Please note, a value of “999999999” in the dataset indicates that the volume data is unavailable and it does not mean that a volume of 999,999,999 m3 was released within the collection area of a wastewater system.

The map is available in both ESRI REST (to use with ARC GIS) and WMS (open source) formats. For more information about the individual reporting wastewater systems, datasets are available in either CSV or XLS formats.

Data from Quebec

As of 2018, no combined sewer overflow volumes from Quebec municipalities are available since an equivalency agreement is now in effect.

More information on the wastewater sector including the regulations, agreements, contacts and resource documents is available at: https://www.canada.ca/wastewater

Datasets available for download

Additional Info

Field Value
Last Updated October 22, 2024, 16:07 (UTC)
Created October 1, 2024, 06:23 (UTC)
Domain / Topic
Domain or topic of the dataset being cataloged.
Environment
Format (CSV, XLS, TXT, PDF, etc)
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Dataset Size
Dataset size in megabytes.
Metadata Identifier
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Published Date
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2022-03-01
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Limits on use
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Owner
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Environment and Climate Change Canada | Environnement et Changement climatique Canada
Contact Point
Who to contact regarding access?
Government of Canada; Environment and Climate Change Canada, 1-800-668-6767, ec.enviroinfo.ec@canada.ca
Publisher
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eu-ww@ec.gc.ca
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Field Value
Identifier
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Contains Indigenous Data
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Field Value
Source
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https://open.canada.ca/data/en/dataset/f182f1f8-9c9b-49e5-8702-9dd37093a768
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Field Value
Indigenous Community Permission
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Community Permission
Community permission (who gave permission).
The Indigenous communities the dataset is about
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Field Value
Number of data rows
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