The authority has seen a rise in incidents recently involving people illegally pumping water from storages and waterways, including from boat ramps and public roadside access points.
G-MW said this behaviour placed additional pressure on already limited water supplies and impacted the broader community.
G-MW Water Delivery Services general manager Warren Blyth said the organisation took a zero‑tolerance approach to unauthorised water use.
“Water theft affects everyone because there’s only so much water to go around,” Mr Blyth said.
“With supplies under pressure, it’s essential people do the right thing and follow the rules.”
He warned that those caught taking water without proper authorisation could face prosecution under the Water Act 1989.
However, Mr Blyth said support options were available for landholders who needed water, but lack entitlements.
G-MW inspectors can provide advice on gaining authorisation, while emergency water supply points are available across Victoria.
About 300 emergency bores and standpipes allow access to water for urgent stock and domestic needs.
Eligible farmers may also receive up to $5000 through Farm Drought Support Grants to assist with water carting costs.
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