General Plumber in Underwood
Underwood’s land use mixes homes with commerce and industry, so tell us what kind of premises you have and what you have noticed.

Homes, commerce and industry on mixed ground: what differs in Underwood
Need a plumber in Underwood for a leaking tap, a blocked drain, a new fixture or a hot water fault? Jim Monger Plumbing and Gas is a family-run plumber and gasfitter serving Logan, and we handle those jobs for homes, rentals and commercial properties. Homeowners, landlords and property managers here should know that, at suburb level, official mapping shows a mix: several land uses, several mapped ground types, two listed water supply zones and a range of heights. That mapping is broad and does not describe any one property. Tell us about your own place when you call, and we can work out what to look at first.
Underwood’s land use is mixed, its mapped ground varies and it is listed in two water supply zones. So a quote, a pressure reading or a diagnosis borrowed from nearby may not carry over to your property. The sections below cover what to say first, how ground might affect underground pricing, and what to ask about pressure.
Underwood is not one kind of place, so the premises comes first. About 43% of its land is urban residential, against about 86% in neighbouring Rochedale South, with about 17% commercial services and about 14% manufacturing and industrial. With that mix of land uses, tell us whether the plumbing belongs to a home, a rental or a business, as our maintenance covers all three. The planning scheme also creates an Underwood business precinct allowing uses such as food and drink outlets, car washes and service stations, so raise those uses when you ask about maintenance or drainage. The answer matters for a hidden leak too: Council may grant a home owner a remission on a high bill, but business premises are excluded and conditions apply, including a licensed plumber’s report and fixing the leak within one month of finding out about it, so check eligibility with Council.
A neighbour’s price for underground work may not be a useful guide. Geology mapping shows about 37% claystone and mudstone, about 22% sandstone, about 22% low alluvial terrace and about 19% basalt across Underwood, where Springwood, by the same method, is about 75% sandstone with no basalt. That mapping cannot say what lies under one block, but a trench in one of those grounds may not go like a trench in another. With ground this mixed, have underground work looked at on site before relying on a price.
Pressure complaints have a local trap too. Logan Water lists Underwood as a main suburb of its Springwood High zone and a partial suburb of Springwood Low, while Rochedale South and Priestdale appear under High but not Low. Those names come with no pressure figures, and a friend’s reading a few streets away may come from the other zone. Logan Water can tell you which of the two serves your property on 3412 3412. After that, have your own pipework and fixtures looked at before anyone blames the street.
Height changes the fault-finding as well. LiDAR contours run from about 70 m in the west to about 15 m in the east by Slacks Creek, so a soggy patch on a lower block may be fed from upslope rather than your own pipe. State mapping puts most of Underwood in the Logan River drainage sub-area and the northern end in the Brisbane River sub-area, so start any stormwater question from the fall of your own block, not the suburb’s. Note where water appears first, and ask for the falls and the source to be checked before settling on a fix. Our stormwater work includes seepage trenches.
Leaks, yard drains and overflow gullies: what to check and who to call first
Hidden leak after a dry spell
About a third of Underwood is mapped as Runcorn soils, dark acid clays classed as Vertosols, which the Queensland Government describes as soils that crack open when dry. The Runcorn unit is not among the main soil units mapped in Springwood, Rochedale South or Slacks Creek. Mapping this broad cannot say what is under your block, but ground movement is one possibility when a leak appears after a dry spell, so the fixture may not be at fault. Our services include leak detection and burst pipe repairs, so mention the dry spell and what you have noticed when you call.
Yard drains swamped in big rain
The Underwood rain gauge on Millers Road recorded event totals of 241 mm in January 2013, 201 mm in May 2015, 176 mm in March 2017 and 678 mm in February 2022. Those are rainfall readings, not a record of any property flooding. Totals like those can overwhelm even a sound yard drain, so one overflow in a big event does not by itself prove a faulty line. We can clear and check stormwater lines ahead of January to March, the wettest months at Logan’s Bureau of Meteorology station.
Stormwater line with an unknown outlet
Queensland’s watercourse mapping shows Slacks Creek running through Underwood for about 2 km, plus about 1.3 km of unnamed channels that do not always flow. The same mapping shows no stretch of that creek in Springwood, Rochedale South or Priestdale. The mapping shows channels, not flood extents, but it is a reason to know where your yard water leaves the block, because a blocked or broken line may stay hidden until wet weather. We offer CCTV drain camera inspections, so ask about having the line looked at.
Outside leak near the meter
Logan Water says it repairs leaks up to and including the water meter, and that pipes and fittings on the property side are the owner’s responsibility. With everything turned off, moving meter dials indicate water is passing through the meter, and the side of the meter decides who to call first. For the road side, ring Logan Water on 07 3412 3412. For the property side, we do leak detection and pipe repairs.
Sewage at the overflow gully
Council describes the overflow relief gully as a plumbing fitting outside your home, and says owners must keep it fitted and maintained and must not direct stormwater into it. The location of the fault decides the first call: Council says to ring a licensed plumber first for sewer pipes on your property, and Logan Water for damaged or overflowing mains. On your side of the system, we clear blocked drains with a jet rodder or electric eel and can check the line with a drain camera.
Our general plumbing services in Underwood
Leaks and burst pipes
Burst pipe repairs and leak detection.
Taps, toilets and fixtures
Leaking taps, toilets and fixtures, plus installations including vanities, toilets, dishwashers, fridges and water filters. At the 2021 Census, 55.1% of Underwood homes had four or more bedrooms against 38.8% across Queensland, so list every bathroom and fixture you want looked at when you book.
Hot water
Hot water repairs, replacements and new installations across gas, electric and heat pump units. Underwood households averaged 3.1 people at the 2021 Census against 2.5 across Queensland, so tell us how many people rely on the system when weighing repair against replacement.
Blocked drains
Blocked drain clearing with a jet rodder and electric eel, with CCTV drain camera inspections.
Stormwater drainage
Stormwater drainage solutions including seepage trenches and pump-out lines. Council’s flood study records that an open channel beside the Bunnings site at Compton and Ewing Roads was filled and replaced with stormwater pipes in the 2017 to 2018 redevelopment, so judge drainage by what is there now, not by memory.
Rental and commercial maintenance
Plumbing maintenance for homes, rental properties and commercial properties. Rentals made up 27.3% of Underwood’s occupied homes at the 2021 Census, so landlords and agents should tell us who approves the work when booking.
Water mains and pipe re-runs
Water main replacement and re-running hot and cold water pipes.
Pre-purchase inspections
Pre-purchase plumbing inspections.
Mixing valves and backflow
Thermostatic mixing valve and backflow prevention installation, testing and yearly maintenance.
Gas fitting
Gas fitting and gas appliance connections under gas licence L90908.
Rainwater tanks and septic systems
Rainwater tank services, and septic system services including tanks and trenches.

Licences, reviews and our Victoria Point base
Jim Monger Plumbing and Gas is based at 3 Jordan Dr, Victoria Point, and our ABN is 72 684 573 242. We hold QBCC plumbing licence 15504687 and gas licence L90908, and we are a member of the Master Plumbers Association of Queensland. Quotes are free. Our Google rating was 4.9 from 100 reviews as of 28 October 2026, a figure covering the whole business. One Google reviewer wrote of being "told honestly what I really needed to do" instead of buying a hot water system they did not need. Another reported using us twice for water leaks outside. A third described hot water and renovation work with advice that considers "the bigger picture of the job at hand". These reviews speak to the business as a whole, and none of them records a job in Underwood.
Before you ring, note whether the property is a home, a rental or a business, which way the yard falls and what has already been tried. Emergency calls for burst pipes, overflowing drains and gas problems are taken 24/7, including weekends.
Frequently asked questions
Can’t see your question? Call us and we’ll talk it through.
Call 0418 871 269Is my address in Underwood?
Council describes Underwood as bounded by Millers Road, Underwood Road, the South East Freeway, Logan Road and roughly Compton Road. The Logan Aquatic Centre and the Underwood shopping centre sit on its southern boundary at Compton Road, and Homemakers shopping is on the Pacific Motorway. If you are near one of those edges, give us your nearest cross street when you call.
Does the suburb’s age tell you what pipes my home has?
No, because Council’s history dates the suburb and not your house. It records that Underwood was gazetted in 1975 and that its western part was developed with a large mail centre and a Big W shopping centre built in the 1970s. Tell us the build year if you know it, and we inspect what is actually there, including before a purchase.
My yard holds water after rain. Should I check flood mapping before paying for drainage?
Yes, look up your address in Council’s free Logan Flood Portal, which gives mapping and a report for a property or point. Council’s accepted flood studies include Slacks and Scrubby Creeks, a catchment its study describes as heavily urbanised upstream of the Logan Motorway. Council also warns that local creek or overland flow flooding may have occurred but not be shown, so a clear result does not rule out pooling. The drainage question can then be looked at separately on site.
Someone told me I need a water softener. Is the water here hard?
Logan Water’s 2024/25 tests for its Springwood supply area averaged 141.25 mg/L total hardness, inside the 60 to 200 mg/L band Council calls good quality. That was one year’s results for the whole area, so ask for evidence from your own system before paying for a softener or accepting scale as the cause.
My tap water suddenly looks or tastes different. Is that my plumbing?
It may not be, because Logan Water says most of Logan’s treated water comes from Seqwater’s Mt Crosby plant through the regional grid, though the source can vary. Ring Logan Water first on 07 3412 3412, since a sudden change may be a network matter rather than a fault in the home.
Can a landlord or agent arrange small rental repairs without a licensed plumber?
Only very minor jobs are unregulated, such as replacing a shower head, tap washers or toilet cistern washers. Regulated plumbing and drainage work must be done by a licensed plumber or drainer, and that includes minor work such as unblocking sanitary pipework, repairing broken pipes and repairing or replacing a fitting. QBCC runs a public register where you can check a licence.
Plumbers 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
Tell us what the property is and where it sits. Call 0418 871 269.
Free quotes, and emergency callouts 24 hours a day.
