Letter Re: Concerns About Toxicity in Water From Roof Catchment Rainwater
Mr. Rawles, I searched the forums to no avail on this topic. In the Pacific Northwest, a common roof setup is untreated wood shakes with copper ridge caps and flashing. The rain hits the copper which leaches chemicals onto the wood shakes to inhibit moss growth. On other sites I’m reading conflicting thoughts on whether this amount of copper renders the water unsuitable for rain catchment into a water barrel for vegetable garden irrigation or a cistern for human consumption. Some folks seem to think there is more danger from the concentrated nitrogen in the water (bird droppings, raccoon feces) …