Commercial Septic Systems in Southern Ontario
For builders, developers, farmers, contractors and commercial property owners: Slegh Septics assesses and installs more complex, higher-flow septic systems for properties that aren't connected to municipal sewer.

Built for higher-flow projects
Commercial and higher-flow systems carry more design flow and more complexity than a single residence. That raises the stakes on the design, the treatment approach and the installation. Slegh Septics is set up to take on that complexity.
Commercial projects can include properties such as:
- Commercial buildings and shops
- Agricultural and industrial rural facilities
- Churches, campgrounds and greenhouses
- Developments and multi-building sites
- Other properties not connected to municipal sewer
Design flow drives the solution
On commercial work, the daily design flow shapes everything — the tank sizing, whether advanced treatment is needed, and how much dispersal area the site has to accommodate. We start from the flow and the site, then design a system that fits both.
One contractor for a complex job
Commercial timelines don't have room for finger-pointing between a designer, an excavator and an installer. With Slegh Septics, the design, the site work and the installation sit with one team that answers for the whole scope.
Have a commercial or higher-flow property off municipal sewer? Tell us about the project and we'll help determine the right next step.
Frequently asked questions
Yes. Commercial and higher-flow systems are a core part of our work, from design through installation. The right approach depends on the design flow and the site.
Yes. A large share of commercial work comes through builders, developers and general contractors who need one accountable septic contractor for design, permits and installation.
Shops, agricultural and industrial buildings, developments and other properties off municipal sewer. We assess each project on its design flow and site conditions rather than assuming past experience with a specific property type.
Discuss a Commercial Project
Share the property and project details and we'll get back to you on the right next step.