Description

Under the regulation on municipal wastewater treatment works (ROMAEU) of the Ministry of the Environment, the Fight against Climate Change, Wildlife and Parks (Ministry), an operator of a municipal wastewater treatment works (OMAEU) must list all the overflows that occur at his structure and report on the basis of a measurement the daily cumulative duration. As such, the City of Montreal sends the overflow conditions for all of these overflow structures in the form of a monthly report to the Ministry's monitoring system for municipal wastewater treatment structures (SOMAEU) via the Internet. The present data made available correspond to the information compiled and transmitted to the Department. It is a compilation of overflow times on a daily basis. **Notice to users: ** The “2024 Overflows” data was corrected on March 31, 2026 following a processing error that affected the duration of the overflows. Releases downloaded prior to this date contain this error.

Resources

Name	Format	Description	Link
2016 overflows	XLS		https://donnees.montreal.ca/dataset/17ec5343-6d39-45b8-9ce1-e76843daaaa4/resource/0bb6a95a-a34a-4932-84cc-8bcf70f06fe2/download/datasurverses2016.xls
2021 overflows	CSV		https://donnees.montreal.ca/dataset/17ec5343-6d39-45b8-9ce1-e76843daaaa4/resource/219f0d38-9fe6-446b-bcc2-bc3bbb22fe7d/download/debordement_2021.csv
2023 overflows	CSV		https://donnees.montreal.ca/dataset/17ec5343-6d39-45b8-9ce1-e76843daaaa4/resource/34a8692e-f750-46d0-82db-4d8955a6702b/download/debordement_2023.csv
2018 overflows	CSV		https://donnees.montreal.ca/dataset/17ec5343-6d39-45b8-9ce1-e76843daaaa4/resource/48aada2a-5dd0-4460-b253-cd88209cc434/download/debordements2018.csv
Excesses of 2022	CSV		https://donnees.montreal.ca/dataset/17ec5343-6d39-45b8-9ce1-e76843daaaa4/resource/510d5de0-b191-4836-8db4-839a0e453116/download/debordement_2022.csv
2019 overflows	CSV		https://donnees.montreal.ca/dataset/17ec5343-6d39-45b8-9ce1-e76843daaaa4/resource/674d0872-6327-48c7-9648-85a83d96bc36/download/debordement2019.csv
Overflows from 2013 to 2015	XLS		https://donnees.montreal.ca/dataset/17ec5343-6d39-45b8-9ce1-e76843daaaa4/resource/7385fe8c-e51c-4317-b3a2-3d9a9dcdb1bb/download/surverses20132015.xls
Overflows of 2025	CSV		https://donnees.montreal.ca/dataset/17ec5343-6d39-45b8-9ce1-e76843daaaa4/resource/84cea13d-89b0-4c17-b0cf-1a812f402ba3/download/debordement_2025.csv
Overflows of 2024	CSV		https://donnees.montreal.ca/dataset/17ec5343-6d39-45b8-9ce1-e76843daaaa4/resource/951c6da3-8dd5-4149-ad74-c4bff37b3e59/download/debordement_2024.csv
2020 overflows	CSV		https://donnees.montreal.ca/dataset/17ec5343-6d39-45b8-9ce1-e76843daaaa4/resource/9e70ec15-b527-4a82-84d8-74df491ebf10/download/debordement2020.csv
2017 overflows	CSV		https://donnees.montreal.ca/dataset/17ec5343-6d39-45b8-9ce1-e76843daaaa4/resource/fed0ee5a-4d8f-46d5-bc08-b66c3c6c0d53/download/debordements2017.csv
Original metadata (https://www.donneesquebec.ca)	HTML		https://www.donneesquebec.ca/recherche/fr/dataset/17ec5343-6d39-45b8-9ce1-e76843daaaa4

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