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Depends on how you collect it, what you store it in, and who you are downwind of . . .

Main concern would be metals (like zinc and copper) and organics (like PAHs) from your roofing materials if you collect off your roof.
 

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Some people use rainwater for a cheap source of very soft water. Certain fish are triggered to spawn when the water hardness drops(simulating a rain) so breeders change the water with rainwater to simulate this.
 
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