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How do I check the septic system on a BC home I'm buying?

Ask the regional health authority for the system's file ($50 a search) and the seller for the maintenance plan and pump-out records, then have an authorized person inspect it before subjects come off.

Opens the report at this answer. A PID always finds the lot; an address needs an exact match.

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What the answer means

A septic system is the owner's to keep working: once you buy, the duty is yours. The papers say how it was built and kept; an inspection says how it is now. Neither is in a home inspection, and neither is open data, so both are asked for, one property at a time.

What the health authority holds
Since May 31, 2005, an authorized person files a system's plans, the soil and what it serves with the regional health authority before building it (Sewerage System Regulation s. 8), and within 30 days of finishing it files a letter certifying it, with an as-built plan and the maintenance plan (s. 9). A system built before then was under a health permit to construct and to operate, which the file may hold instead. A small repair needs no new filing; a significant alteration or repair does (s. 8 (1)).
Asking for the file
Interior, Fraser, Northern and Island Health each take a records request for a property, by its address and legal description, for $50 (Fraser Health charges nothing if it finds nothing). Each says the file may not be found or may not hold an accurate drawing of the system: older systems often have no record, and one built or repaired without filing has none. Interior Health asks whether the property has been subdivided, as the legal description will have changed. In Vancouver Coastal Health's area, ask its health protection office.
What the owner keeps
The authorized person gives the owner a copy of the plans, the maintenance plan and the letter of certification (s. 9 (1) (a)). The owner must keep the system maintained to that plan and keep records of the maintenance (s. 10). A holding tank needs a health officer's permit and its own maintenance plan and records (ss. 4, 5).
Who may inspect it
Only an authorized person may maintain a Type 1 or Type 2 system: a registered onsite wastewater practitioner (a ROWP, registered with ASTTBC) or a professional trained in onsite systems, such as an engineer (ss. 1, 6, 7); a Type 3 system or one for more than 9,100 litres a day needs a professional (s. 6 (3)). For a sale, ask them to find and open the tank, pump it, check the baffles and any pump and alarm, and look over the field for wet ground or surfacing effluent (our reading). A home inspection usually leaves the septic out: see home inspections.
A system that fails
Sewage on the ground or into water is a health hazard (s. 2.1), and the owner must see that the house's sewage goes to a sewer, a holding tank or a system built and kept to the regulation (s. 3). A health officer can order the owner to connect to a sewer or a holding tank, or to repair or alter the system (s. 11), and operating a system with no letter of certification filed is an offence (s. 12 (e)).
What it means for a buyer
Make the offer subject to the septic, request the file early (Interior Health asks for 5 business days), and match what's filed against what's there: the number of bedrooms it was designed for, where the field is, and the 30 m from the well. A system with no file isn't unlawful because of that alone, but its size and age are unknown until it's inspected. Ask a ROWP what a replacement on this lot would need.

Our summary of the Sewerage System Regulation (B.C. Reg. 326/2004, ss. 1, 2.1, 3, 4 to 12) on BC Laws, and the records request forms of Interior Health, Fraser Health and Northern Health and Island Health's sewerage page, read 2026-10-20. Fees and forms change: check the health authority's own page before you apply.

Sources, read 2026-10-20 and summarised in our words unless marked otherwise: Sewerage System Regulation, B.C. Reg. 326/2004; Sewerage file information request form, Interior Health; Request for Sewerage System Information, Fraser Health; Sewerage System Information Request, Northern Health; Sewerage systems and subdivision, Island Health; Health authority contacts, Province of BC (read 2026-10-20); Registrant directory (pick ROWP), ASTTBC (read 2026-10-20).

Before you buy: who to ask

The seller or their agent
Is the property on a well or community water, and on a septic system or sewer? For a well, can I see a recent flow test and water quality test; for septic, its permit and last pump-out? Can I have the maintenance plan and the maintenance records, and has the system been repaired or replaced?
The regional health authority
What is on file for this property's sewerage system: a filing, a letter of certification, a permit, an as-built plan, any order?
A registered onsite wastewater practitioner
Can the well and septic system be inspected and tested before subjects are removed? What size and type is the system, what state are the tank and field in, and what would a replacement need on this lot?

Look up the lot above: its report screens the room for a septic field against the wells, water and lot line, and says where a community sewer is mapped.

See also room for a septic field, home inspections, subjects and the deposit, what a seller must disclose, wells and unpermitted work.

Buying rural land? Before you buy rural land in BC: the nine questions that decide an offer, on one printable page.