To find stormwater drains on your property, check available building or drainage plans, then trace visible downpipes, grates, pits, inspection points and outlets from ground level. These features can indicate the route of buried pipes. If the route remains unclear, use a professional locator rather than excavating.
Stormwater carries rainwater runoff and is separate from the sanitary sewer, which carries wastewater. Check where household sewer and stormwater drains lead if the purpose of an outside grate or pipe is uncertain.
Check plans and visible drainage features
Review property records: Check documents supplied with the property, approved building plans, any stormwater or property drainage plan, and previous plumbing records. Ask your local Sydney council what records are available for your property; availability and document names vary between councils. Council stormwater maps may show public infrastructure but not every private pipe.
Trace roof drainage: Identify gutters, downpipes and connections entering the ground. Note where downpipes appear to converge, including connections from rainwater tank overflows.
Find collection and access points: Look for grated surface drains, strip drains, stormwater pits, capped inspection points and visible outlets. Check low areas around driveways, courtyards and other paved surfaces.
Follow the likely route: Compare the alignment of downpipes, pits and drains with the property’s slope. Stormwater usually flows by gravity, but underground pipes may change direction or cross the apparent fall of the land.
Confirm the discharge point: Compare plans with any outlet visible from within the property or at its boundary. Do not assume the system connects to the street gutter or a council drain without confirmation.
Extensions, landscaping and earlier drainage work can make old plans incomplete. Visible components show only part of the system and do not confirm the exact underground route. If a visible inlet is overflowing or drains slowly, follow the safe process for clearing a stormwater blockage.
If the route remains unclear
Stop before digging, lifting heavy covers or entering any pit, pipe, culvert or drainage channel. Do not place your hands inside drains. These spaces may contain contamination or receive sudden flows, and electricity, gas, water or communications services may be nearby.
Before any excavation, obtain current Before You Dig Australia plans and appropriate professional advice. A professional drain locator or licensed plumber may use suitable access points, a drain camera with a locating transmitter, or other non-destructive equipment. The appropriate method depends on access, pipe material, depth and site conditions.
If plans and visual checks do not locate the stormwater drains, contact our licensed Sydney stormwater plumbers for a non-destructive assessment before renovating or excavating.