The reports of lead in rainwater takes comes from some people wanting to BAN rainwater tanks in the city – something about competing with the water authorities for supplying water. I would expect the study was commissioned (Paid for) by a bottled water company.
The article sited the reason for the lead was lead as part of roof construction. Ie roof capping. If you have a modern house (no lead on the roof) you can use the water for your reptiles.
I personally use mineral spring water to increase their calcium. I have noticed a mark difference in my pets after starting them on mineral water.
On the lead in water tanks – it was also sited lead content was “50 times Australia's drinking water guidelines” – Australia does not have any guidelines – it is a local water authority guideline and changes between water authorities.
Here is the article for those of you who want to read it.
http://www.news.com.au/story/0,23599...rom=public_rss 
