Municipality or health unit
In many places the local building or health authority holds permit information for smaller residential systems.
Provincial office
Other provinces use a provincial department, health authority or Government Service Centre.
Ask the owner
Old paper records, pumping receipts and installer invoices can fill gaps, but they should be separated from official approval documents.
Map what you find
A reliable system sketch is valuable for service, renovation planning and future sale.
Property-specific rule: septic approvals, filings, permits and qualified-person requirements differ across Canada. Use the province and city-area guides to reach the correct official starting point.
Before you act
Keep the system location, approval records and service history together. For purchases, failures or renovations, use a qualified onsite professional appropriate to your province and the scope of work.