Construcciones Yamaro: Why dewatering on construction sites must start with compliance

Dewatering is a regulated activity in Australian construction. (Image: Coates)

On many construction and infrastructure projects, dewatering is treated as a practical site activity – install the pumps, move the water and keep the project moving.

But across Australia, dewatering is far more than a pumping exercise. It is a regulated activity, and failing to address approvals, environmental impacts and compliance early can expose projects to delays, financial penalties and reputational risk.

According to Ernest Lapornik, engineering solutions specialist at Coates, the challenge is that dewatering is still frequently approached as an operational task rather than a regulatory and environmental consideration.

“Dewatering is often seen as just pumping water,” he says. “But regulators across Australia look at much more than the pump itself. They regulate the right to take water, the works used to extract it and how that water is used or disposed of.”

In New South Wales, these requirements sit under the Water Management Act 2000, which regulates several aspects of construction dewatering, including water access licensing, extraction infrastructure such as bores or wellpoints, and the management or discharge of extracted water.

Other states operate under similar frameworks, meaning project teams must consider approvals related to water extraction, environmental discharge, groundwater impacts and monitoring. Compliance in one area does not automatically guarantee compliance in another.

“You can be compliant in one area and non-compliant in another,” says Lapornik. “That’s where projects often get caught.”

Exemptions exist – but they must be evidenced

In some circumstances, construction dewatering activities may qualify for regulatory exemptions or streamlined approval pathways. However, these exemptions are typically narrow, conditional and require clear documentation.

For example, in NSW, small-volume construction dewatering activities may fall within exemption thresholds under certain conditions, and some coastal construction exemptions have been extended until 30 June 2029. Projects delivered under State Significant Development (SSD) or State Significant Infrastructure (SSI) pathways may also operate under modified approval processes, although water access licensing requirements often remain.

Ernest says one of the most common compliance issues arises when exemptions are assumed rather than verified.

“An exemption isn’t a vibe,” he says. “It’s something you need to be able to evidence. Regulators assess facts, not intent.”

A tightening regulatory environment

Environmental and water regulators have strengthened their oversight of construction activities in recent years. Enforcement powers have expanded, penalties have increased, and regulators now have clearer mechanisms for addressing illegal water extraction or environmental harm. As a result, the risk profile for poorly managed dewatering has changed.

“The era of ‘it’s only dewatering’ is over,” says Lapornik. “Regulators expect the same level of discipline applied to any other critical temporary works system.”

Dewatering is an impact problem, not a pump problem

Beyond regulatory compliance, poorly managed dewatering can create broader project risks. Excessive groundwater drawdown can lead to ground settlement, while untreated water may mobilise contaminants or impact receiving waterways. In some regions, dewatering can also trigger acid sulfate soils.

Because of these risks, regulators increasingly expect projects to treat dewatering as a planned and auditable system, rather than a reactive site activity. That includes defining expected extraction volumes, monitoring groundwater conditions, establishing approved discharge pathways and maintaining clear compliance records throughout the project lifecycle.

Industry practitioners are also increasingly embedding predicted versus actual volume tracking within regular site reporting. This approach allows project teams to monitor extraction volumes in real time, creating an auditable record that supports regulatory compliance and reduces risk if approvals or variations need to be justified later.

Planning before mobilisation

The most effective way to manage dewatering risk is to address it early in the project planning process. Before mobilisation, project teams should be able to answer several key questions:

• What source is the water being extracted from?
• What volumes and duration of extraction are expected?
• Are exemptions being relied upon, and can they be clearly evidenced?
• What approvals apply to extraction and disposal?
• What records will demonstrate compliance?

“Best practice is to treat dewatering as a regulatory, environmental and program risk – not just a hire item,” says Lapornik. “That means defining the pathway early and building systems that will stand up to regulatory scrutiny.”

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