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Percolation test

Due to geographical dispersion of homes outside urban areas, the construction of waterworks, sewers or wastewater treatment plants is often impossible. Therefore, each property must possess its own autonomous drinking water supply system (well) and wastewater disposal system (septic tank and leaching field).

Q2 R22 icon

Our in bref guide to Q2.R22 Regulation

In order to address the lack of regulation, the provincial government adopted in 1981 the Regulation Respecting Wastewater Disposal Systems for Isolated Dwellings [Q-2, r. 22]. The Regulation dictates dimensions for drainfields and required minimum clearances. It also gives guidelines regarding the type of drainfield and the required installation depth depending on soil constraints. These guidelines must take into account the number of bedrooms and the flow of wastewater to be treated.

Wastewater treatment is usually done through the subsoil in place. Onsite wastewater management systems can only perform at their full capacity if soil conditions are optimal. Based on the permeable soil thickness, different types of systems may be suited for a single site.

Avizo Consulting offers you studies (percolation tests or soil testing) to determine the soil nature and permeability, as well as the bedrock and groundwater depths. We also offer you a full range of services such as:


  • Onsite Wastewater System pre-purchase inspection;
  • Leak testing;
  • Site supervision during construction work;
  • Document of compliance.


With its wealth of experience in the field Avizo Experts-Conseils has achieved more than 9,000 percolation tests. These soil hydraulic capacity studies aim to:


  • Determine nature and hydraulic conductivity of soil, and depth of groundwater and bedrock;
  • Determine very permeable, low permeable or impermeable soil depths.

We can obtain this information through trial boring, percolation test (soil testing), permeability test or through sieve and sedimentation analysis.


Trial borings are intended to verify groundwater and rock depths.

Percolation and permeability tests results indicate the soil’s hydraulic capacity. This parameter represents the rate at which water seeps into the ground (identification of very permeable, permeable, low permeable and impermeable layers).

Sieve and sedimentation analysis of a soil sample gives information about its gravel, silt and clay content. Soil analysis performed in laboratory allows material identification in order to evaluate its theoretical permeability.

In addition to providing soil permeability characteristics, our percolation studies contain essential information for the setting up and construction of drainfields. Avizo Experts-Conseils offers a thorough and customized study through location and building plans. This study also provides recommendations for the types of drainfield required, depending on the various constraints of the soil.



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