How often should my septic system be inspected or maintained?
Most residential septic systems should be inspected and maintained annually, depending on system type, usage, and age. Regular maintenance helps identify issues early, ensures system components are functioning properly, and helps extend the life of the system.
Type 1 systems typically require annual maintenance, while Type 2 and Type 3 systems often require more frequent servicing — commonly 2 to 4 times per year. The required maintenance frequency is outlined in your system’s maintenance plan, which is filed at the time of installation.
If you cannot locate your maintenance plan, you can request a copy from your local health authority for a small administrative fee (often around $50).
How often does a septic tank need to be pumped?
Most septic tanks require pumping every 3–5 years. Pumping frequency depends on tank size, household water use, and overall system maintenance. Pumping removes accumulated solids but does not replace the need for regular maintenance or system assessments.
What are the warning signs of septic system problems?
Common warning signs include slow drains, sewage odours, unusually green or wet areas over the drainfield, gurgling plumbing, or sewage backups. If you notice any of these symptoms, it’s best to have the system assessed before the issue worsens.
Can I drive or park over my septic system?
No. Driving or parking over a septic tank or drainfield can compact soil, damage pipes, and significantly shorten the lifespan of the system. Septic areas should remain free of vehicles, heavy equipment, and structures.
What can't I put down my drains or toilets?
Do not flush wipes (including “flushable” wipes), feminine hygiene products, grease, oils, food waste, chemicals, or harsh cleaners. These materials can damage system components and disrupt the biological treatment process.
Do I need a permit to install or repair a septic system?
In British Columbia, septic systems require a filing prepared by an Authorized Person. An Authorized Person may be a Registered Onsite Wastewater Practitioner (ROWP) or a Professional Engineer with declared competency in sewage systems.
The filing is submitted to the local health authority prior to construction, repair, or alteration. Installations, alterations, and repairs MUST comply with BC’s Sewage System Regulation and the Ministry of Health Standard Practice Manual.
Working with a qualified practitioner ensures your system is properly designed, filed, and installed in accordance with the regulatory requirements, supporting a smooth approval process and long-term system performance.
How long does a septic system last?
With proper design, installation, and maintenance, a septic system can last 25–40 years or more. Neglect, poor site conditions, or improper use can significantly reduce system lifespan.
What’s included in a septic site assessment?
A site assessment typically includes soil evaluation, test pits, review of setbacks and site constraints, well and waterbody locations, easements / covenants, Development Permit Areas (DPA's), Official Community Plans (OCP's) and identification of suitable system options. This information is factored in to determine the most appropriate septic design for the property.
Can a septic system be upgraded or repaired instead of replaced?
In some cases, yes. Targeted repairs or upgrades can address specific issues and extend system life. A professional inspection / assessment is required to determine whether repair, upgrade, or full replacement is needed.
What is a septic performance inspection for real estate transactions?
A septic performance inspection is commonly requested as a subject pending purchase or sale of a property to assess the current condition, performance and location of an existing septic system.
The inspection includes a review of available records, an on-site assessment of system components, verification of system location, and evaluation for visible signs of malfunction.
Performance inspections provide a snapshot of system operation at the time of inspection and include a written report with a site schematic showing system location for future reference.
What is the septic process for subdivisions?
Septic feasibility is assessed early in the subdivision process to confirm each proposed lot can support both a primary and reserve septic system, this is a requirement for subdivision.
Following submission to the Approving Officer, applications are referred to Island Health for technical review. As ROWPs, we complete site inspections for each proposed lot. This includes soil testing, percolation testing, and the evaluation of site conditions.
We coordinate with the Environmental Health Officer (EHO), who reviews the assessment and inspects test pits and percolation holes. A BC Land Surveyor prepares the subdivision plot plan, with septic information shown in conjunction with the survey.
Based on agency input, the Approving Officer may issue Preliminary Layout Approval (PLA), request revisions, or decline the application. Final approval occurs once all conditions are satisfied and plans are registered with the Land Title Office.
What should I consider before adding a suite, Airbnb, or increasing occupancy?
Adding a suite, short-term rental, or additional bedrooms will increase the wastewater load on your septic system. If the system is not designed for the increased use, it can become overloaded, leading to poor performance and early system failure.
Before making changes, it’s important to confirm whether your existing system can safely handle the increased load. The involvement of an Authorized Person (ROWP) is required to assess the system and design upgrades or modifications that match the anticipated use.
Increased occupancy often requires some level of system upgrade unless the system was originally designed with future expansion in mind. Confirming septic capacity early helps support building permits, suite approvals, future property sales, and helps avoid costly issues or delays.
