Lead contamination testing in the tap water of Peel Region homes found none possessed dangerous levels, while the results of Toronto's findings will be revealed on Thursday.
The province recently ordered 36 Ontario towns and cities to submit test results by midnight Wednesday after the City of London found unsafe lead levels in tap water in about 25 per cent of older homes that were tested.
The Ontario Drinking Water Advisory Council on Monday recommended the province act immediately to implement increased testing and monitoring of water at homes, schools and private facilities.
Environment Minister Laurel Broten, however, said she would wait to see the results of drinking water tests before acting on the recommendations.
The lead problem has even made its way into the Ontario legislature as signs posted inside the 110-year-old building advise visitors not to drink the water because of unacceptable contamination levels.
Opposition parties accuse the government of hiding the problem because the warning signs weren't posted until the day after California Arnold Schwarzenegger toured Queen's Park.
Conservative Leader John Tory said it is a "complete disgrace'' the government hasn't done more to protect the province from lead contamination in drinking water.
"They are acting as if they have something to hide here, or they're acting as if they just want to hope this goes away,'' Tory said.
"They're not taking the kind of firm, decisive action that I think the people of Ontario have the right to expect when it comes to their drinking water."
But Premier Dalton McGuinty said he's proud the government sought the advice of the expert panel and insisted that action would come soon.
"I think we'll just have to do whatever it takes to ensure ... we're safe, make sure the water's not making us sick,'' he said.
Health experts say lead in drinking water can cause a variety of adverse health effects.
In babies and children, lead exposure can result in delays in physical and mental development, along with slight deficits in attention span and learning abilities. In adults, it could cause kidney problems or high blood pressure.
Most Ontario municipalities will test a home's water for free, but if the service line from the street to the home has to be replaced, the homeowner could be on the hook for between $2,000 and $10,000.
With a report from CTV's Paul Bliss and files from The Canadian Press
