EBMUD states on its website regarding the use of rainwater harvested from a roof covered with asphalt shingles:

“….While any material is usually acceptable, asphalt shingles may leach toxins and should not be used to collect water for vegetable gardens. ”

I collect rainwater from my garage roof, which is a flat roof covered with a seamless membrane, self-adhesive surface, base layer -oxidized bituminous coal; fiberglass mesh with resin and sand layer.  The brand, Mod Bit Cap Sheet, is made by Mule-hide and the MSDS can be found at https://www.mulehide.com/Roofing-Products/p/ModBitCapSheet

Can you tell me if water collected from my garage roof can be used to water vegetable gardens?  I use a first-flush diverter.


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