Serving the mid-Island
Septic systems on Gabriola Island
Electoral Area B — no sewer anywhere, wells in fractured sandstone, and a second land-use authority.
Nanaimo Septic Systems works Gabriola Island, in Electoral Area B of the Regional District of Nanaimo, with no community sewer and land use governed by the Islands Trust. You are on your own for water too: homes here draw water from fractured bedrock, and the provincial well database records 2,092 wells on the island.
Every property treats on site, and nearly every property draws water from the same fractured rock. Percolation and groundwater are both known problems on Gabriola.
Two authorities, no sewer
Electoral Area B covers Gabriola along with De Courcy and Mudge Islands. Land use planning is not handled by the Regional District but by the Islands Trust, through the Gabriola Island Local Trust Area, which is unusual for a community in this region. There is no community sewer anywhere on the island, and the Official Community Plan conditions residential parcel sizes on approval of an onsite sewage disposal system — so on Gabriola the septic system comes first and the house follows.
Percolation in fractured rock
Percolation for septic disposal and groundwater supply are both known problems on Gabriola, because groundwater moves through fractures in the bedrock instead of consistent soil. That bedrock belongs to the Nanaimo Group — sandstone and mudstone rather than the deep unconsolidated deposits found on the main island. Where soil is thin over fractured rock, effluent can move through it faster than it gets treated.
Water is the binding constraint
Recharge to the island aquifer is estimated at about 199 mm per year, roughly a fifth of precipitation, and an increasing number of households now supplement wells with rooftop rainwater collection. The Regional District monitors aquifer 709 through six wells; as of June 2026 one was rising, three were stable and two were in moderate decline, against a regional picture of 16 of 22 mapped aquifers sitting below normal. On ground that holds this little water, the separation between your field and your well is one of the first things we measure.
Percolation on Gabriola has to be measured on the specific lot, and the Islands Trust adds a land-use step the mainland communities do not have. To start that properly, book a site visit.
Nearby service areas
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Text or call (236) 362-1344