Where Silkstone’s
tap water comes from.
Silkstone is on the Urban Utilities drinking water network, supplied from Seqwater’s Mt Crosby treatment plants on the Brisbane River. Every connected home in the city gets it the same way: water released from Wivenhoe Dam travels down the Mid Brisbane River to Mt Crosby, Seqwater’s East Bank and West Bank plants treat it, and Urban Utilities pumps it through its Ipswich reservoirs to your meter. Seqwater reports on the City of Ipswich zone every month. The headline figures are in the table below.
Seqwater adds two things on purpose. The first is chloramine, a disinfectant that holds a residual longer than plain chlorine over the long mains out to Silkstone. It is also why a standard carbon jug does less than people expect. The second is fluoride, dosed to a target of 0.8 mg/L under Queensland law. Fish keepers need to neutralise the chloramine. Anyone on home dialysis should talk to their unit about filtration.
Mineral spike after heavy rain, 20 November 2024. Treated water from the Mt Crosby plants recorded total dissolved solids of 700 and 730 mg/L (guideline 600), chloride of 270 and 300 mg/L (guideline 250) and hardness of 250 mg/L (guideline 200) after a significant rainfall event pushed natural mineral concentrations up in the Mid Brisbane River. Five aesthetic guideline exceedances, no health exceedance. Seqwater Drinking Water Service Annual Report 2024–25
How hard is the water in Silkstone?
Network water here is moderately hard: 80–115 mg/L as CaCO₃, against an aesthetic guideline of 200 mg/L. It spiked to 250 mg/L in November 2024 after heavy rain washed minerals into the Mid Brisbane River. You see it as scale on kettles and shower screens. It costs most on hot water elements and heat exchangers. Scale protection on the feed is worth fitting to a hot water system in Silkstone. A whole-house softener is usually more than this water needs. Hot water systems in Silkstone ↗
The pH is going up
Seqwater is lifting the pH of water leaving Mt Crosby from about 7.8 to a target of 8.4 from mid-August 2026, to extend disinfection in warm months, raise alkalinity and reduce corrosion in the network. The change covers Brisbane, Ipswich, Logan, Moreton Bay and parts of the Scenic Rim. In Silkstone homes, copper pipes and brass fittings corrode less in slightly more alkaline water. Hot water systems will scale a little more. Fish keepers should re-check their tank water after the change.
What the pipes in Silkstone add
Most of Silkstone was plumbed before copper became standard, and galvanised steel water pipes are still in service under a lot of houses here. They corrode from the inside. That is where brown water first thing in the morning comes from. Old brass fittings and solder can also add trace lead to water that has sat in the pipe overnight. The Australian Government’s health advice costs nothing: run the tap for about 30 seconds after it has been unused for several hours, then fill the kettle. After that, the question is how much of a failing run to replace. A plumber can answer that.
The 2021 Census counted 1,641 private dwellings in Silkstone, 93% of them separate houses. About 37% of households rent. Everyone else owns the plumbing between the meter and the tap, and most of what follows is about that stretch.
Bundamba Creek: where Silkstone’s water goes
The Bremer rises near Rosewood and Warrill Creek, runs through the centre of Ipswich and meets the Brisbane River at Barellan Point. Bundamba, Deebing, Ironpot, Western and Warrill creeks all feed it. Most of the City of Ipswich drains here. Silkstone’s stormwater reaches Bundamba Creek.
Healthy Land & Water rated the Bremer River catchment “Poor” for environmental condition in the 2025 Report Card, with social and economic benefits rated very high. An independent Griffith University review published in February 2021 found the Bremer receives contaminants from four sewage treatment plants, a former coal mine, an abattoir and a power station, and that its water quality had not improved in 20 years. Council's Waterway Health Strategy and Habitat Connections program are the long-term response; the Report Card is the scorecard. 2025 Report Card ↗
The Queensland Government publishes live readings from stream gauges in the catchment. This is the nearest to Silkstone:
Where the wastewater goes
Silkstone is sewered. Wastewater goes to one of Urban Utilities’ four Ipswich treatment plants, at Bundamba, Goodna, Carole Park and Rosewood, and the treated water is released to the rivers under Queensland environmental authorities. You own the sewer drain under the house and out to the connection point. Blockages, root intrusion and overflows happen there. Sewer drain repairs in Silkstone ↗
Sources: Seqwater monthly water quality report, City of Ipswich zone · Seqwater Drinking Water Service Annual Report 2024–25 · Seqwater: pH level of drinking water enhanced in parts of South East Queensland · Urban Utilities: Water hardness · Healthy Land & Water Report Card 2025: Key Messages & Catchment Summaries · Water Monitoring Information Portal · ABS 2021 Census QuickStats. Figures are for the City of Ipswich supply zone; Seqwater and Urban Utilities do not publish results by suburb. Housing descriptions are general observations about the suburb and do not describe any individual property. Data last updated 2026-10-01.
