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Wastewater and sewers

Sewer backups and basement flooding

Information and resources on sewer backups and basement flooding.

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Sewer Use Program

The Sewer Use Program is designed to help residents and businesses understand their impact on the environment, their responsibilities and the resources available to help them comply with the Sewer Use By-law.

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Combined Sewage Storage Tunnel (CSST)

construction site and updates, the tunnel boring machine, open houses, planning and consultation…

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Water and Wastewater Networks - Interactive Map

Water Distribution and Wastewater Collection Systems map. Information includes the locations of watermains, hydrants, valves, manholes, pipes, inlets/outlets, associated facilities and related details. 

Key information available for pipes within the wastewater collection system includes, length (m), diameter (mm), materials, upstream and downstream inverts, similarly, key information for the water distribution system includes diameter and material which can be viewed in a popup window by clicking on individual pipes in the map view.


The Water and Wastewater infrastructure depicted in this interactive map is derived from existing and collected engineering drawings for the City of Ottawa's Geographic Information System and is protected by copyright. The locations of this infrastructure information is approximate, and should not be used for construction purposes.