Septic System Replacement in Southern Ontario
Systems don't last forever, and properties change. When a septic system reaches the end of its life or no longer suits the property, Slegh Septics designs and installs the replacement — including leaching bed and tank replacement.

Common reasons a system needs replacing
There isn't one single reason systems get replaced, and we won't try to diagnose your property over the internet. That said, replacements usually come down to a handful of situations:
- An aging system or components at the end of their service life
- A planned home addition or an increase in sewage flow
- A failed inspection or damaged components
- Property redevelopment
- A system that simply no longer meets the property's needs
Leaching bed and tank replacement
Replacement doesn't always mean the entire system. Sometimes it's the leaching bed (also called the septic bed) that needs rebuilding; sometimes it's the septic tank. We assess what the property actually needs today and scope the work accordingly, rather than replacing more than necessary — or less.
Start with an assessment
The right first step is a replacement assessment. We look at the property and the existing system, confirm what's required, and design a replacement that fits the site and current requirements. Then the same crew installs it.
Dealing with a system that's backing up or failed an inspection? Start with a replacement assessment — we'll tell you what the property needs and what the work involves.
Frequently asked questions
Replacing a septic system generally requires a permit under the Ontario Building Code, and requirements vary by municipality and by what's being replaced. We prepare the required documentation as part of the project.
Sometimes. Whether the tank, the bed or the whole system needs replacing depends on the assessment. We scope the work to what the property actually needs.
Age, overloading beyond the design flow, damage, and changing property use are common factors. Rather than guess online, we assess the specific system on site.
Yes. Failed inspections during a sale or refinance are a common reason people call. We assess, design and install the replacement.
Request a Replacement Assessment
Share the property and project details and we'll get back to you on the right next step.