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Is there room for a septic field on my property?
BC's septic rules are set province-wide by the Sewerage System Regulation and its Standard Practice Manual. A report measures how much of the lot is clear of the setbacks from recorded wells, mapped water and the lot line, and how steep that ground is.
The report opens at this answer, with the lot drawn on the map and every other check alongside. A PID (on the tax notice or title) always finds the lot; an address works when it's an exact match.
What the answer means
- Who can do the work
- Only an Authorized Person may plan, install and repair a septic system: a Registered Onsite Wastewater Practitioner, or a professional engineer or geoscientist trained in onsite systems. Owners can't design their own.
- Filing
- Before work starts, the Authorized Person files the plans with the regional health authority. Within 30 days of finishing, they file a letter certifying the system, with an as-built plan and a maintenance plan. A holding tank needs a health officer's permit instead.
- Setbacks
- The field stays 30 m from a drinking-water well (60 to 90 m from a high-pumping well), 30 m from a lake, river or permanent stream, 15 m from seasonal water and the sea, and 7.5 m from a downslope drain or bank where effluent could break out. As a guideline, it stays 3 m from the lot line and 6 m from another field. The tank has its own setbacks.
- Slope
- Gravity-fed fields aren't allowed where the ground slopes more than 15%, mounds and at-grade beds more than 25%, and trenches more than 45%. Over 15%, the Authorized Person also considers slope stability.
- Soil
- Whether a field works depends on the soil: how deep it is to rock, hardpan or the seasonal water table, and how fast it drains. Only test pits and a percolation or permeability test on the lot show that.
- Buying a property with a system
- Ask for the filing and the letter of certification, the maintenance plan and records (the owner must keep them), and have the system inspected and the tank pumped. Older systems may have no records.
- Local rules
- Local governments can set larger setbacks, a minimum lot size for septic, or require sewer connection where it is available. A lot on a community sewer doesn't need a field: where the local government publishes its sewer service areas or sewer mains as open data, the report's septic section leads with that (the places are listed on Data sources).
A report's septic figure is a screening from maps, not a site assessment: wells that were never registered, small streams and soil conditions aren't on any open map. Confirm with a Registered Onsite Wastewater Practitioner and the regional health authority before you buy or build.
Source: Sewerage System Regulation, B.C. Reg. 326/2004 (summarised in our words, read 2026-10-04); Sewerage System Standard Practice Manual, version 3 (2014), Province of BC: Tables II-6, II-19 and III-16 (summarised in our words, read 2026-10-04); Groundwater wells (GWELLS), Province of BC (Open Government Licence – British Columbia).
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