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Really, lead is an inhalation hazard in the form of Load Oxide (PbO2) and as an ingestion hazard in pretty much any form. Don't inhale or drink the water and you'll be fine. You can drink the water if you want, the lead would rather stay bonded with the sulpher (in the form of sulfide) than to become free and get into the water. Lead is only truly hazardous when it isn't bonded with anything else. Then it bonds with you.