One water company for the whole city
Sydney Water supplies drinking water and takes away wastewater for Greater Sydney, the Blue Mountains and the Illawarra. A burst main in the street, a fault at the meter or sewage spilling from a maintenance hole is its job.
Its responsibility stops short of your house. You own every wastewater pipe and fitting up to where it meets Sydney Water's system, including the point of connection itself, and your private line can run past your boundary.
Who looks after which pipe
| Who owns it | What that means for you | |
|---|---|---|
| Sewer (wastewater) pipes | You, up to and including the point of connection. Sydney Water owns the junction. | Roots growing into the junction at your point of connection are yours to clear. |
| Drinking water pipes | You, from Sydney Water's system to the taps. Sydney Water maintains the meter. | Sydney Water may repair the pipe between its system and the meter, up to one metre inside your boundary. |
| A line shared with neighbours | Each owner who shares it. | Agree with the other owners before anyone digs. |
| Stormwater | Your downpipes and yard drains are yours. Street gutters are the council's. | A blocked downpipe is a plumbing job; a backed-up street gutter goes to council. |
When a licensed plumber finds a blockage in Sydney Water's pipes and reports it, you can claim reasonable out-of-pocket expenses, up to 2 hours of their work. Clear it without reporting it and that claim is gone. Our page on blocked drains in Sydney has Sydney Water's test for whose side a blockage is on.
What's different about plumbing in Sydney
Nearly a third of homes are apartments
At the 2021 Census, 30.7% of Greater Sydney's occupied homes were flats or apartments, against 21.7% across NSW, and 55.8% were separate houses. In a strata building the owners corporation usually handles plumbing in boundary walls and under the floor.
Frost is a western problem
The Bureau's Sydney (Observatory Hill) station averaged no days at 2°C or colder across 1859 to 2020. Camden Airport in the south-west averages 39.9 such days a year, and 16.2 at or below freezing. Exposed pipes and meters out there are worth wrapping before winter.
Heavy rain can push sewage back
Sydney Water says stormwater getting into its wastewater pipes during rain can overload them, sending sewage onto private land and sometimes inside homes. Its rule is that rainwater and stormwater must stay out of your wastewater system, and downpipes plumbed into the sewer are a usual culprit.
Checking an NSW plumber's licence
NSW treats plumbing, drainage and gasfitting as specialist work, and contracting for any of it needs a contractor licence, even for a small repair. The NSW Public Register shows the licence categories and expiry date, plus any conditions, suspensions, public warnings or penalty notices. Every ad must carry the licensee's name and licence number, so look it up. Our licence check guide shows how.
Paperwork worth keeping
Before most plumbing and drainage jobs, the plumber lodges a Notice of Work, which in metropolitan areas goes to Building Commission NSW through MyInspections. Emergency work, new tap ware and swapping an existing hot water system don't need one. At the end, a Certificate of Compliance confirms the work meets the Plumbing Code of Australia, and you're owed a copy.
Hot water and gas, NSW style
Replace a hot water heater in NSW and a temperature control device goes in too, even for an identical unit. Heat pump and solar discounts, and the gas rules, are on hot water in Sydney and gas fitters in Sydney.
Warning signs NSW regulators have acted on
- Pressure to approve a big job on the spot. Two plumbing businesses NSW banned in June 2026 had misrepresented urgency, overcharged and skipped written quotes and itemised invoices.
- A first-name brand on a search ad with no licence number, or an invoice from a different business to the one you booked.
Sydney specialists and areas
Choose the page for your problem: hot water, hot water replacement, hot water repairs, blocked drains, leak detection, pipe relining, gas fitting, bathroom plumbing, commercial plumbing or an emergency plumber.
Area pages such as Parramatta, Penrith, the Northern Beaches and Sutherland Shire cover each council and its local conditions.
What we would do
Work out where the problem sits before you ring anyone: inside the house, in the yard, or past the fence. Past the fence, or affecting the whole street, report it to Sydney Water first. In a strata building, tell the strata manager. Then look up the plumber on the Public Register, and ask them to report any blockage on Sydney Water's side rather than clearing it at your cost.