Blocked Drains in Mount Cotton
Heavy rain, a sloping block, a blackout or a septic tank each change what to check first on your Mount Cotton property.

Let the hill and the last storm set your first check
Jim Monger Plumbing and Gas offers blocked drain clearing to homeowners, landlords and property managers across its service area, using a jet rodder or electric eel, with a CCTV drain camera to look for the cause. The business is based at Victoria Point, with Mount Cotton in its service area. The suburb drains to several creek systems and conditions differ across it, so useful advice depends on where your block sits. A gully backing up after a storm, a slow drain on a lifestyle block and a drain that stopped after a blackout each point to a different check. Work out which one you have, then ring us with it.
Before anyone puts a machine down your line, it helps to know three things: what the weather has been doing, where your block sits on the hill, and whether your wastewater leaves the property at all. The answers change what you check first and what you ask us to do.
Council names localised creek flooding and overland flow in heavy rain as the primary flood risks here, naming Tingalpa, Eprapah, Native Dog and Serpentine Creeks. So when a yard drain fails only in a downpour, clear its grate and look at where the water is coming from before paying to clear a pipe. Council’s creek flood maps leave overland flow out, so being off them does not rule this out. Council also lists Mount Cotton Road south of Woodlands Drive as having flooded before, so if your way in uses that stretch, check it after heavy rain and never drive through floodwater.
Height varies a long way here: Redland Water’s 2016 master plan split this area into four water zones because elevations run from 10 to 105 metres, from the south-east corner of Mt Cotton Village up to the reservoir zone. That plan covers water supply, not drains, but blocks here clearly sit at very different levels, so a neighbour’s answer may not fit yours. As a general guide, a backup on a sloping line often shows first at the lowest gully. West of Mount Cotton Road, the same plan describes rural land climbing to the back of some properties, so a private run there may be long and steep, and a camera can help before anyone digs.
Then check the power: Council’s profile says some properties here have on-site wastewater systems that may not operate during extended outages, so after a long blackout, check the system has power before you pay for a blocked pipe. Council also reported in August 2016 that a generator was installed so the Mt Cotton wastewater treatment plant could keep operating in blackouts, a report about that plant only. Whatever your set-up, if sewage overflows during an outage, do not touch it, and ring for help.
The kind of property changes the next question. Native Dog Creek runs through Mount Cotton Village, and its catchment reaches well beyond the suburb, about two thirds of it in Logan City. Council’s entry for that whole catchment describes lifestyle blocks in its upper west and says many rural non-urban properties use septic or on-site systems. That says nothing about your own block, so confirm where your wastewater goes, and if it goes to a tank, ask about the tank, since Council recommends an annual check on septic properties. In the Village, the low density residential layout the 2016 plan described suggests a more suburban line, but confirm your connection rather than assume it.
Slopes, tanks and other Mount Cotton drain problems
Runoff heading for a septic trench
The area’s waterways start in the Mount Cotton hills from about 230 metres above sea level, so on a sloping block rain may run towards whatever sits below it. Council’s septic care list includes diverting stormwater from the disposal area, along with keeping grease and fats out of the sink. We can look at the septic side and the stormwater side together, as we offer septic services including trenches and stormwater work including seepage trenches and pump-out lines.
Slow drains on a tank system
Council says that when solids and scum take up too much tank space, too many solid particles flow into the trenches, which become clogged. If your property has a septic system, Council says a house holding more people than the system was designed for may need more regular pumping. Tell us how many people live in the house and how the drains have been running, so the tank gets looked at before anyone assumes a pipe blockage.
Wipes, toys or roots in the line
Council lists tree roots, fats, wet wipes, paper towels, sanitary products, clothing and toys among the causes of sewer blockages. At the 2021 Census about 25.9% of residents here were under 15, so it is worth asking the household about wipes and toys when a blockage keeps coming back. We clear lines with a jet rodder or electric eel and offer CCTV drain camera inspections. A blockage that keeps coming back may need its cause found, not just another clearance.
Roof or yard water in the sewer
Council also lists stormwater connected illegally to the sewer among blockage causes, so a plumber may check where a downpipe or yard drain ends up when a gully misbehaves in wet weather. Council says stormwater must never be directed into the sewer, and that overflow relief gullies are not designed for roofwater pipes. We offer CCTV drain camera inspections and stormwater drainage solutions, so ask about both when you ring.
A system far from the road
Council describes a semi-rural suburb of bushland with large rural properties in areas such as Ridgewood Downs and limited access routes. On a large block, the tank, trench or drain may be a long way from the road and hard to reach. Tell us about gates, access and where the system sits when you book, so the visit starts in the right place.
Our blocked drain services in Mount Cotton
Blocked drain clearing
Blocked lines cleared with a jet rodder or electric eel. Tell us which gully showed it first and how far down the slope it sits.
CCTV drain camera inspections
A drain camera goes down the line so the cause is looked for rather than guessed at. Worth raising on a long, sloping private run before anyone talks about digging.
Stormwater drainage
Stormwater drainage solutions, including seepage trenches and pump-out lines. If water reaches your yard drains from higher ground, tell us where it comes from and where your downpipes discharge.
Septic system services
Septic system services, including tanks and trenches.
Plumbing maintenance
Maintenance for homes, rental properties and commercial properties.
Emergency plumbing calls
Calls taken 24/7, including weekends, for overflowing drains, burst pipes and gas problems.

Licence and Google reviews
Jim Monger Plumbing and Gas is a family-run plumber and gasfitter serving Redlands, Logan and south-east Brisbane. The business holds QBCC plumbing licence 15504687. The business held a Google rating of 4.9 from 100 reviews as of 28 October 2026. In Google reviews, one long-term customer described a clogged, smelly drain diagnosed swiftly and resolved. A repeat customer praised two outside drainage jobs for expert advice, high-standard work and on-time arrival. Another reported a blocked drain fixed quickly, with prompt service and value. These reviews speak to the business as a whole and are not tied to one area.
When you ring, tell us three things: whether it started in rain, after an outage or in dry weather, which gully or fixture showed it first, and whether your wastewater goes to sewer, septic or a pump unit. Emergency calls are taken 24/7, including weekends, for overflowing drains. You can also send an enquiry through our contact page.
Frequently asked questions
Can’t see your question? Call us and we’ll talk it through.
Call 0418 871 269How do I find out if my block is on the sewer or a septic system?
Council’s sewage plant on German Church Road sits in the suburb, but that does not show any given property is connected to it. Council says existing properties may have on-site sewerage disposal instead of a sewer connection. If you are unsure, say so when you ring and we can start by looking for a tank on the block.
On a sewered block, how do I tell if the blockage is on Council’s side?
Council gives two outdoor checks: an overflow relief gully overflowing when no water is in use points to its main, and an inspection opening that holds liquid or overflows when a tap runs inside means contact Council, while a dry one points to private plumbing. Do not touch sewage while you check. Council says an owner must first have a plumber inspect and confirm the blockage is not on their side before claiming costs, so keep that finding and the invoice.
My hillside property has a pump unit and an alarm. Who do I call?
Council says pressure sewerage is often used where land is very hilly or very flat, so check if your property has one. If it does, the pump, tank, control box and property line are the owner’s responsibility, and Council says to call a private plumber or service agent for a blockage or alarm.
My block falls away from the street. Where should the stormwater go?
Council says owners are responsible for stormwater on their own land, draining to a lawful point of discharge such as a kerb adapter, the kerb and channel, or an inter-allotment drainage system where the block slopes away from the street. We can look at a blocked or overflowing line on your land and offer stormwater solutions.
Water is coming down from the block above mine. Can you fix that?
We can clear and assess the drain on your land, but we cannot settle what happens between neighbours. Council treats disputes about natural overland flow as a civil matter, so mediation or legal advice is the place for that question.
My septic system smells but the drains still run. Is it blocked?
Not always: Council says the most common septic problem is a pH imbalance that turns the tank acidic and causes bad odours, usually from the wrong items going in. Council’s Maintaining a septic system page, linked under Sources on this page, sets out its method, and a check can rule out a full tank or a blockage first.
Can I ring while the storm is still going?
Yes, emergency calls are taken 24/7, including weekends, for overflowing drains. Ask about timing when you ring, and tell us about any road or access problem at your end.
What equipment should I ask a plumber about?
Council’s general advice for sewer blockages is to make sure the plumber has specialised tools such as jet rodding and a pipe inspection camera. Ours are a jet rodder, an electric eel and a CCTV drain camera.
Blocked drains in nearby areas
Not listed? We probably still cover your area, so give us a call.
Related services
More ways we can help around your home or business.
Guides
What to check yourself first, and when it needs a plumber. All guides
Rain, slope, blackout or septic: tell us which. Call 0418 871 269.
Free quotes, and emergency callouts 24 hours a day.
