Sanitary drainage
Sanitary drainage is the below-ground pipe system that carries waste from fixtures to the sewer. Governed by AS/NZS 3500 Part 2 on residential builds.
Ask Chalkline about this →Sanitary drainage is the system of below-ground pipes that carries waste water and sewage from fixtures inside a building to a sewer connection, on-site wastewater system, or common effluent scheme at the property boundary. It includes drain pipes, junctions, inspection openings, and vent connections but not the above-floor sanitary plumbing stack. On a residential build, sanitary drainage falls under AS/NZS 3500.2 and must be laid to minimum falls (typically 1:60 for a 100 mm pipe), tested before concealment, and signed off by a licensed plumber via a Certificate of Compliance.
Also known as: sewer drainage, sanitary drain, below-ground drainage
Category: Plumbing
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Last updated: 2026-05-08. Verified: 2026-05-08.