Serving the Cowichan Valley Regional District
About Duncan Septic Systems
The short answer
Duncan Septic Systems is a local septic-service brand covering installation, repair, pumping, and inspection across Duncan, Cobble Hill, Shawnigan Lake, and Mill Bay. Every system is designed, installed, and filed with Island Health by ROWP-registered professionals under BC's Sewerage System Regulation, with free on-site assessments and new systems from $15,000.
What Duncan Septic Systems does
Duncan Septic Systems connects Cowichan Valley homeowners with ROWP-registered installers and technicians for septic installation, repair, tank pumping, and inspection. The focus is straightforward: the right system for the soil, honest pricing, and every install filed and certified.
Local knowledge
Septic on the Cowichan Valley floor means working with heavy clay, high winter water tables near the Cowichan and Koksilah rivers, and sensitive shorelines at Shawnigan Lake and Cowichan Bay — conditions that decide whether a lot needs a simple gravity field or advanced treatment. That local read shapes every system.
Standards and compliance
In BC, a septic system must be designed, installed, and filed with Island Health by an Authorized Person — a Registered Onsite Wastewater Practitioner (ROWP) or a Professional. Duncan Septic Systems works with ROWP-registered installers who file each system and provide the Letter of Certification that makes it legal to use.
Service area
Duncan Septic Systems serves Duncan, Cobble Hill, Shawnigan Lake, and Mill Bay, plus Cowichan Bay, Maple Bay, Lake Cowichan, and Chemainus across the Cowichan Valley Regional District.
Explore septic system installation in detail, or see all the service areas covered.
For septic installation, repair, pumping, or an inspection anywhere in the Cowichan Valley, request a free on-site assessment.