Sydney Water workers took a campaign to keep the utility in public ownership to the streets of Springwood on Saturday.
The workers demanded Member for Blue Mountains, Roza Sage, reveal where she stands on the privatisation of Sydney Water - a challenge she was happy to accept.
"The NSW government has no plans to privatise Sydney Water. This has repeatedly been ruled out by the minister," she told the Gazette.
The call from the Sydney Water workers came after it was recently revealed the NSW government hired a firm to find ways of increasing private involvement in the state's 28 waste water plants - including the Winmalee and Cascades treatment plants, 70 sewerage pumping stations and 15 water reservoirs based in the Blue Mountains.
Australian Services Union NSW assistant secretary Ben Kruse said Blue Mountains residents deserved to know whether their local MP will fight to keep their water services safe, not just up until the election, but into the future.
"We're calling on Roza Sage to pledge her commitment to ensuring our essential services stay in public hands," he said.
But Mrs Sage said the government has "been upfront with the public about our plans for public assets, unlike the previous Labor government's lies over its privatisation plans".
"The union should be asking John Robertson and Labor to explain to the people of the Blue Mountains how they can be trusted on these issues," she said.
"It is clear for all to see that the unions are running the Labor campaign in the Blue Mountains and neither of them have a single policy that will benefit the people of NSW... Blue Mountains residents deserve to hear the truth, not union scaremongering."