Water from asphalt shingles is generally not considered acceptable for drinking or for irrigating plants meant for human consumption. However, it does depend on what kind of asphalt shingles you have. Certain shingles leak toxins into water, while others don’t. It can be difficult, though, to determine what kind of shingles you have. It is best to play it safe and not use water collected from your roof, and perhaps invest in a rainwater collection system.
It’s not safe to use water collected from an asphalt roof to water your plants. Many modern asphalt shingles have zinc, which can be toxic. In addition, they may trickle out complex hydrocarbon compounds, which are hazardous for human consumption.
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