Plumbing in Mullumbimby

Mullumbimby had more flooded homes in 2022 than any other town in Byron Shire, so many enquiries are about checking or replacing hot water units, drains and fixtures in low-lying homes, alongside the usual repairs and the tank and septic work on rural blocks outside town. This website forwards your request to an independent local plumbing business; that business sets the price, books the visit and stands behind the work it does. The points below are specific to Mullumbimby properties.

How did the 2022 flood affect plumbing in Mullumbimby?

The NSW SES Byron Shire local information records that in 2022 the Brunswick River reached 4.97 metres at Mullumbimby and flooded large parts of the town, and that flood height records there go back to 1954. Local paper The Echo, reporting the NSW minister’s answers to questions in Parliament, said 468 homes in Mullumbimby were counted as flooded in February and March 2022.

When floodwater gets into a house it also gets into the plumbing. Hot water units standing on the ground can take in silt and water around the burner or elements, external gas regulators and electrical controls can be damaged, and sewer lines can fill with mud. Years on, owners still find problems that trace back to the flood: a drain that has never run freely since, or a replacement unit installed in a hurry that now needs proper work. The flood plumbing guide for the Northern Rivers explains what to have checked after floodwater has been through a property.

Where does Mullumbimby’s water come from now?

Mullumbimby used to have its own supply from Lavertys Gap Weir. Byron Shire Council’s water supply page explains that while erosion at the weir was repaired, the town was supplied through an extended Emergency Water Main, and that Council resolved in late 2025 to connect Mullumbimby permanently to the Rous regional network that supplies the rest of the Shire. Council still runs one water treatment plant in Mullumbimby. For most households the change made no difference to the plumbing inside the house, but if you notice a change in pressure, taste or how quickly fittings scale up, mention it in the enquiry so the plumber can rule things out.

Byron Shire Council’s main office is at 70 Station Street in Mullumbimby, which is useful to know if you need to collect property records such as a sewer diagram in person.

Which plumbing jobs are common in and around Mullumbimby?

Property type	Typical job	Things to note in an enquiry
Low-lying town house	Hot water replacement, drain camera check, raised or relocated units	Whether the unit or drains went under in 2022
Older timber home on stumps	Leaking pipes under the floor, worn taps, toilet suites	Pipe material if you can see it, access under the house
Rural block outside town	Tank pump faults, septic or treatment system problems	Pump model, tank sizes, system type
Rental or shared house	Recurring blockages, tap and cistern wear	How often it happens and which fixtures

For replacing an electric or gas storage tank, the hot water systems page explains the repair and like-for-like options, and the rainwater tanks and pumps page covers tank properties around the town.

Should a replacement hot water unit go in the same spot?

In a home that has flooded before, it is worth asking the plumber whether the new unit can sit higher or in a different place. Lifting a unit onto a platform, or moving it to a higher part of the house, can keep the controls and burner out of shallow floodwater. The answer depends on the layout, the weight of a full tank, gas or electrical supply and the relief valve drain, and some moves need more pipework than others.

Published Byron Bay estimates put an electric storage system, supplied and installed, at $840 to $3,150, before any extra work to raise or relocate it. That figure is a guide from a cost site and not a quote. You can ask for a Mullumbimby hot water quote with the label details from the old unit and a photo of where it sits.

What does a careful plumber check after a Mullumbimby flood?

• Whether floodwater reached the hot water unit, the gas regulator or meter, and electrical controls.
• Mud and silt in sewer lines, yard gullies and stormwater pits, usually with a camera.
• The overflow relief gully, which should sit below the lowest fixture and clear of the ground.
• Flexible hoses under sinks and toilets that sat in floodwater.
• Whether earlier repairs were done by a licensed plumber with the right paperwork.

A responsible provider will not reconnect a gas appliance that has been under water without it being checked, and will not sign off drainage it has not inspected. Gas work also needs a licensed gasfitter.

Which council and licence rules apply in Mullumbimby?

Mullumbimby is in Byron Shire, and Byron Shire Council is the local plumbing regulator for the area. Council expects the plumber to lodge a Notice of Works two business days ahead of work that needs it, and new water or sewer connections need approval under section 68 of the Local Government Act 1993, as explained on its plumbing and drainage page. NSW requires a licence for every plumbing and gasfitting job regardless of its value, and you can see how to confirm one on the about page.

Nearby towns

Downstream on the same river, the Brunswick Heads page covers a town where tides add to flood problems. South through the hinterland, the Bangalow page focuses on acreage with tanks and septic systems.

Next step

To book in a Mullumbimby plumbing check, tell the provider whether the house took water in 2022 or later floods, which fixtures or units were affected, and what has been repaired since. For a hot water job, give the brand, size and fuel from the label. Photos of the unit, the yard gully and any water marks on walls help a plumber judge the work before visiting.

Send a job enquiry