If rain water is collected from the roof, consider the fiberglass from the shingles, airborne contaminants of heavy metals, air pollution and then the actual contaminates of animal and bird feces, mold or fungus and paint from the inside of rain gutters, metal roofs have zinc in the runoff water.
Questioning if the collected rain water from the roof is safe for vegetable gardens, that is a lot of contamination of the water that is feeding plants, to feed people. However ornamental plants and lawn will benefit. Make a good choice.
If you choose to collect rain water, consider a couple of open lid barrels and a huge funnel in your storage for the purpose of collecting rain water directly and a way to strain and purify for use.
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