Régie du bâtiment du Québec

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Regulations and intervention process

Quebec regulations concerning plumbing are set out in Chapter III of the Construction Code and Chapter I of the Safety Code.

Amendments to Chapter III, Plumbing, of the Construction Code came into force on April 29, 2014. This chapter comprises the National Plumbing Code (NPC) of Canada 2010 and amendments made for the province of Quebec. You can obtain this publication on the National Research Council Canada (NRC) websiteThis link open an external website of the Régie du bâtiment du Québec in a new window..

Main amendments introduced in 2014

The NPC 2010 makes several changes in its new edition, the chief ones being:

  • an outlet pipe of at least 2 inches in size for clothes washers
  • a water piping of at least ¾ inch in size that serves any water heater supplying more than one appliance
  • a suds pressure zone limit no more than 2.44 meters up in a vertical pipe
  • a complete reworking of the requirements set out for the sizing of water supply piping
  • introducing the CSA B128.1 standard, “Design and installation of non-potable water systems”, for the designing, fabricating and installing of grey water reuse systems.

Provisions for Quebec

The provisions that were adopted for the province of Quebec with regard to updating Chapter III, Plumbing, prorogate most of the measures introduced in July 2008 which had not been included in the NPC 2010, add some new measures, and either revoke or adapt certain provisions from the NPC 2010 to bring them into line with the purposes of the Building Act.

The particular goals of these measures are:

  • to prorogate the administrative measures which provide a framework for the implementation of Chapter III, Plumbing, of the Construction Code.
  • to introduce standard ASSE 1072, “Performance Requirements for Barrier Type Floor Drain Trap Seal Protection Devices”, with regard to floor drain trap seals.
  • to allow indirectly connecting an ice machine and a HVAC system to a draining system.
  • to require a running trap in retention pits connected to an oil interceptor.
  • to render leakproof the cover of a retention pit or sump pit receiving the waters from a drainage pipe (French or rubble drain), and install a vent pipe if content is pumped.
  • to add provisions limiting to 43°C the temperature of hot water at the shower faucet so as to lower the likelihood of burns in care occupancies and private seniors’ résidences.
  • to require an amalgam interceptor in dentist offices.
  • to provide for a minimum temperature of 60°C in any hot water tank.
  • to install the storm building drain left of the sewer, as was required in the old Quebec Plumbing Code.
  • to limit maximum water flow velocity in the water piping to 3 meters per second.
  • to make available on site the required plumbing plans and specifications.

The scope of the Plumbing chapter of the Construction Code remains the same as that of the previous Code, namely plumbing systems located in a building or in a facility intended for public use. The obligation to have plans and specifications for the work continues in force if the total hydraulic load to be installed exceeds 180 fixture units.

Intervention process

To ensure compliance with the regulations affecting plumbing, the RBQ:

  • issues licences authorizing owner-builders to carry out plumbing work
  • conducts administrative and technical assessments in connection with any licence application, or follows up on complaints, former records, unusual construction sites, etc.
  • in cases where assessments reveal issues, takes special remedial actions. The RBQ’s levers for action in this respect are as follows:
    • more stringent verification of an installation or construction at its different stages
    • notifications to agent corporations and professional bodies.

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