Blocked drains in Auckland: what is blocked, whose pipe it is, and what happens next

Most people call us about a drain when the problem has already made itself obvious: the shower is standing in water, the toilet rises instead of falling, or there is a smell in the yard that was not there last week. By then the question is not really “is it blocked”, it is “how bad is this, and who has to pay for it”.

This is what we look at, in the order we look at it.

Is it the fixture, or is it the drain?

The quickest thing you can do before calling anyone is work out how much of the house is affected.

If one fixture is slow and everything else runs away normally, the problem is almost always in that fixture’s own waste pipe. A basin that gurgles while the shower is fine is a basin problem.

If two or more fixtures are slow, or if using one makes another back up, the blockage is further down where those pipes join. Flushing the toilet and watching the shower tray fill is the classic version of this. That is a drain problem, not a plunger problem.

If the gully trap outside is overflowing, everything upstream of it is already backing up and you should stop using water in the house until someone gets there. That overflow is doing its job: it is designed to spill outside rather than inside.

What actually blocks drains in Auckland houses

Tree roots are the most common cause we see, particularly in the older suburbs where the drains are earthenware. The pipes were laid in short lengths with mortar joints, the joints move over sixty or seventy years, and roots find the moisture. They do not have to break the pipe to block it.

Fat and food are the next most common, and they are almost entirely a kitchen problem. Fat goes down warm and sets on the way, then everything else in the pipe sticks to it. Once there is a fat layer, the drain narrows every week until it closes.

Wipes are the third. Anything sold as flushable still behaves like fabric in a pipe, and it catches on the smallest root or lip.

Then there is the pipe itself. Old earthenware cracks, clay ground moves, and a section can drop out of line so that solids stop travelling. When we find that, cleaning the drain only buys time.

Whose drain is it?

This matters more than most people expect, because it decides who pays.

The private drain from your fixtures to the point of connection is yours. That covers most of what goes wrong, including the section running down the side of the house and under the lawn.

The public wastewater main is Watercare’s, and so is the connection itself. If the blockage is in their line, they deal with it.

The awkward one is the shared private drain. In a lot of older Auckland streets, two or more properties run into one private line before it reaches the public main. That shared section is the responsibility of all the properties it serves, which is a conversation nobody enjoys having with a neighbour. It is also why the camera matters: a recording that shows where the blockage sits, and on whose side of the boundary, turns an argument into a fact.

What we do when we get there

We clear it first, then we find out why. Clearing is a drain machine or a water jetter depending on what is in there, and roots in particular need cutting rather than pushing.

Then we put the camera down the line. We own our CCTV gear and we are qualified drainlayers, so on most jobs we can look down the line on the same visit rather than booking you in with someone else first. What comes back is a picture of the actual pipe: where the roots are getting in, whether the fall is right, whether a section has failed. On larger excavation or relining work we will sometimes bring in a specialist crew, but the diagnosis starts with us.

From there it is one of three answers. Cleaning is enough and it will be fine for years. Cleaning is enough for now, and the same joint will do this again every winter. Or the pipe is broken and it needs repairing, relining or replacing before you throw good money at it a third time.

What you can do before we arrive

Stop putting water down the drain. Every toilet flush and every load of washing is now going somewhere it should not.

Lift the gully trap grate outside and clear the leaves off it, because sometimes that is the whole problem.

Leave the chemical drain cleaner in the cupboard. It rarely touches a real blockage, it does nothing at all to roots, and it means whoever opens that pipe is opening it onto caustic liquid.

Common questions

Do drain cleaning chemicals work?

On a slow basin with a soap and hair build-up, sometimes. On an actual blocked drain, no. The blockage is usually metres away and mostly solid, and the liquid simply sits on top of it. Roots ignore it completely.

My gully trap is overflowing. Is that an emergency?

It is urgent, but it is also the system working as designed. The gully is a deliberate low point so that a blocked drain spills outside instead of coming up through the shower. Stop using water inside, keep children and pets away from it, and get someone out that day.

Will tree roots come back after they are cut?

Yes, unless the way in gets fixed. Cutting roots clears the pipe but leaves the crack or open joint that let them in. If the camera shows a single failed joint, repairing that section solves it permanently. If the whole line is full of small entries, relining or replacing the drain is the honest answer.

Does insurance cover a blocked drain?

Clearing a blockage is maintenance and is usually not covered. Damage caused by the blockage often is, which is a different thing: if wastewater has come up through the floor and soaked the flooring, that part may well be a claim. Take photographs before anything gets cleaned up, and read our notes on how these claims actually run.

How long does it take?

Most blockages clear inside an hour, and the camera adds twenty minutes or so. Repairs are quoted separately once we know what the camera shows, because a single joint under the lawn and a full line under a concrete driveway are not the same job.

Blocked drain now, or the same drain for the third time this year? Call Nexus Plumbing or email [email protected]. We carry our own drain camera, so most of the time you get an answer on the first visit.