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Holding Tanks

Holding tank

Standard BNQ 3682-901
Prefabricated Sewage Holding Tanks for Residential Use – Dimensional and Physical Characteristics

Waste water treatment relies on structures designed to be solid, effective and safe. For that reason, the BNQ has developed a series of standards on septic tanks, holding tanks and absorbing wells. In particular, the BNQ 3682-901 standard specifies the dimensional and physical characteristics of prefabricated holding tanks for residential use made of concrete, fibreglass-reinforced polyester or polyethylene. The standard applies to prefabricated holding tanks for underground installation to hold sewage from a low-flush toilet or chemical toilet, and grey water from isolated residences.

  • Download standard (French only)
    12875 ANG BNQ 3682-901 Prefabricated Holding Tanks for Residential Use - Dimensional and Physical Characteristics
    PROJECT IN PROCESS (planned date for publication: March 2026)
    7985 FRN BNQ 3682-901 Fosses de rétention préfabriquées pour usage résidentiel - Caractéristiques dimensionnelles et physiques
    Il s'agit d'une reconduction (confirmation) du texte de l'édition du 8 octobre 2008.
    REVISION IN PROGRESS (expected date for the new edition: March 2026)

  • Standards committee members
    Number of committee members : 17
    Miguel AlmassyDBO Expert
    Marie-Christine BélangerPremier Tech Water and Environment
    Normand BoyerLes Blocs Normand
    Dominique Claveau-MalletRéseau Environnement
    Jonas DomingoSociété d’habitation du Québec (SHQ)
    Claude GagnéAssociation des ingénieurs municipaux du Québec (AIMQ)
    Francis GaudetCOMBEC
    Étienne GaudetteSOLUO
    Daniel GélinasNorwesco Canada
    Pascal LamontagneCoalia
    Stéphane MarquisBéton Provincial
    Radhouane MasmoudiUniversité de Sherbrooke
    Yohan McNicollBéton Dunbrick
    Paul RoyOrdre des technologues professionnels du Québec (OTPQ)
    Anibal Jose SchiffinoMinistère de l'Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs (MELCCFP)
    Daniel St-PierreMEI Assainissement
    Christian VézinaGestion Christian Vézina

 

Certification Offer

Marque de certification - Fosses de rétentionFor a structure manufacturer conducting business in Québec, BNQ certification is an excellent calling card. The BNQ has therefore established a certification program to certify waste water treatment structures based on four documents, including the BNQ 3682-925 protocol. This protocol establishes the procedural rules and marking requirements applicable to the certification of prefabricated septic tanks to the requirements of BNQ 3680-905, prefabricated holding tanks to the requirements of BNQ 3682-901 and prefabricated structures for absorbing wells to the requirements of BNQ 3682-850.

This certification program is accredited by the Standards Council of Canada.