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Ministère de l’Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs
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Water section

Domestic, community, and municipal wastewater

The tolerance measures regarding compliance with certain obligations in the Regulation respecting municipal wastewater treatment works that were implemented during the COVID-19 pandemic ended on May 1, 2022.

Domestic wastewater is water from toilets, as well as greywater (water from kitchens, baths, washing machines, and certain household appliances other than a toilet). In the case of community or municipal sewage systems, industrial waste may be included. It is vital that this water be properly managed in order to protect public health, preserve our waterways, and provide a clean environment for future generations.

This section contains information concerning domestic wastewater management for community, municipal, and individual projects generating more than 3,240 liters of domestic wastewater every day.

Laws and regulations

Project authorizations

Ministerial positions

Information sheets

Guidance manuals

Municipal depollution attestations

Municipal wastewater treatment plant monitoring system (SOMAEU)

Registration or update sheets:

User guides

Technical guides

Information sheets

  1. Calculations within the SOMAEU system for monitoring municipal wastewater treatment works (French, PDF, 212 KB)
  2. Reasons for Notices to the Minister (French, PDF, 264 KB) 
  3. 2017 Annual Report (French, PDF, 736 KB) 
  4. Overflow systems (French, PDF, 721 KB)
  5. Non-compliance incident detection (French, PDF, 190 KB)

Operation and monitoring of municipal wastewater treatment works

  • 2013 (French, PDF, 43 MB)
  • 2012 (French, PDF, 18.9 MB)
  • 2011 (French, PDF, 18.4 MB)
  • 2010 (French, PDF, 1.1 MB)
  • 2009 (French, PDF, 1.2 MB)
  • 2008 (French, PDF, 1 MB)
  • 2007 (French, PDF, 1.3 MB)
  • 2006 (French, PDF, 1 MB)
  • 2005 (French, PDF, 1 MB)
  • 2004 (French, PDF, 2 MB)
  • 2003 (French, PDF, 1.8 MB)
  • 2002 (French, PDF, 2 MB)
  • 2001 (French, PDF, 1 MB)

Information sheets

Others documents 

New technologies

Validation sheets

Recommendation sheets

Recommendation data sheet for the treatment of domestic wastewater (French)

Information sheets

Useful publications and references