Septic Systems in Duncan

• Septic System Installation

  New and replacement septic systems — Type 1 conventional through Type 2 advanced treatment — designed for Cowichan Valley soils and filed with Island Health.

• Septic Repair

  Fixing failed drainfields, cracked tanks, broken pipes, and backups — diagnosed and repaired to restore a system, not just paper over it.

• Septic Tank Pumping & Cleaning

  Routine pump-outs every 3 to 5 years that keep solids from reaching the field and prevent the failures that cost far more.

• Septic Inspection

  Point-of-sale and maintenance inspections that check tank, field, and flow — the written report buyers, sellers, and owners need.

• Site & Soil Evaluation

  Perc and soil testing plus system design and the Island Health filing every new or replacement system requires.

• Drainfield Replacement

  Rebuilding tired or failed dispersal fields — the part of a septic system most likely to wear out on older Cowichan lots.

Explore septic services & guides

• Septic System InstallationSeptic system installation in Duncan and the Cowichan Valley — Type 1, 2, and 3 systems designed, installed, and filed with Island Health by ROWP-registered installers.
• Septic System RepairSeptic repair in Duncan and the Cowichan Valley — failed drainfields, cracked tanks, and backups diagnosed and fixed by ROWP-registered technicians. Free assessments.
• Septic Tank Pumping & CleaningSeptic tank pumping in Duncan and the Cowichan Valley — $250–$500 pump-outs every 3 to 5 years that protect your drainfield, by ROWP-registered technicians.
• Septic InspectionSeptic inspections in Duncan and the Cowichan Valley — $300–$700 point-of-sale and maintenance inspections with a written report, by ROWP-registered technicians.
• All septic systems servicesBrowse the full service lineup.
• Areas we serveCommunities across the Cowichan Valley Regional District.
• Septic cost guideTypical installed price ranges for new systems, pumping, and inspections.
• Common questions answeredCost, Island Health filings, pumping schedules, and inspections explained.

• 

  Duncan

  New tank installation, rural acreage

  A new concrete septic tank set into place on a wooded Duncan-area lot, part of a full system replacement filed with Island Health.

• 

  Cobble Hill

  Two-compartment concrete tank

  A new two-compartment concrete tank set and sealed on a Cobble Hill property, with risers brought to grade for easy future service.

• 

  Shawnigan Lake

  Poly tank, treed lakeside lot

  A poly septic tank installed on a treed Shawnigan Lake lot, chosen to fit tight access and protect the surrounding shoreline.

• 

  Mill Bay

  Septic tank pump-out

  Routine pump-out on a Mill Bay property — regular servicing keeps solids from reaching the drainfield and extends the life of the system.

• How much does a new septic system cost in the Cowichan Valley?

  +

  A new septic system in the Cowichan Valley typically runs $15,000 to $30,000 for a conventional Type 1 system and $25,000 to $45,000 or more for an advanced Type 2 system, driven by soil, site access, and the size of the home. Soil testing, design, and the Island Health filing add about $2,000 to $3,000.

• Do you need a permit to install a septic system in BC?

  +

  In BC a septic system is not permitted but filed. Under the Sewerage System Regulation, an Authorized Person — a Registered Onsite Wastewater Practitioner or a Professional — files the design with Island Health before construction and submits a Letter of Certification when it is done, and the system cannot legally be used until that filing is complete.

• How often should a septic tank be pumped?

  +

  Most Cowichan Valley households pump the tank every 3 to 5 years, sooner for larger families or smaller tanks. Pumping runs about $250 to $500 and is the cheapest way to avoid a solids-clogged drainfield, which is far more expensive to fix.

• What are the signs of a failing septic system?

  +

  Slow drains, sewage backups, gurgling pipes, wet or lush patches over the drainfield, and odours near the tank or field all point to a failing system. An inspection finds whether the fix is a pump-out, a repair, or a field replacement.

• What is the difference between a Type 1, 2, and 3 septic system?

  +

  A Type 1 system is a septic tank with a gravity drainfield; a Type 2 adds a treatment unit that produces cleaner effluent for tighter soils; a Type 3 adds tertiary treatment and disinfection for the most sensitive sites, such as lakeside lots near Shawnigan Lake or Cowichan Bay.

• Do I need a septic inspection when buying or selling a home?

  +

  A septic inspection is standard on rural Cowichan Valley property sales — most buyers, lenders, and insurers want one. An inspection checks the tank, drainfield, and flow and runs about $300 to $700, with a written report.

• Who is allowed to install a septic system on Vancouver Island?

  +

  Only an Authorized Person under the Sewerage System Regulation — a Registered Onsite Wastewater Practitioner (ROWP) or a Professional such as an engineer — may design and install a system and file it with Island Health. Duncan Septic Systems works with ROWP-registered installers.

• What areas do you serve?

  +

  Duncan Septic Systems serves Duncan, Cobble Hill, Shawnigan Lake, and Mill Bay, plus Cowichan Bay, Maple Bay, Lake Cowichan, Chemainus, and the rural Cowichan Valley Regional District.