Is the tap water you drink free of contaminants? It turns out that's not a lead pipe cinch. The province is set to release the results of its tests on the H20 in 35 towns and cities, after high levels of lead were detected in the stream coming out of older homes in London, Ontario. Lead is a dangerous contaminant that could be leaking out of pipes that are more than 50 years old, and can cause all kinds of serious health issues.

The government has taken immediate action to comply with a recommendation from the Ontario Drinking Water Advisory Council that suggested urgent testing of the quality of water in homes, schools and private facilities across Ontario. The situation was brought home to politicians when it was discovered that the liquid coming from the taps at Queen's Park had high lead levels, prompting a warning for all those at government headquarters to use bottled water until further notice.  That's led to an order that all offices have been ordered to install new filters - a move that's costing taxpayers thousands of dollars.

CityNews tested the blood levels of three longtime Queen's Park veterans to see how high the lead levels were in their system. The results: all three had only small traces of the substance in their blood, well within medically acceptable guidelines.

The results of the water exams are expected to be revealed on Thursday. What happens if your house is one of those that needs to get the lead out? It depends on the source. Most Ontario cities will test it for free, but if the line from the street to your home needs to be replaced, you'll be spending money like water, doling out between $2,000 and $10,000 for a repair. Find out how to get it tested here.