Rainwater collected in San Francisco on April 5th, 2015 contained 160μg/L of barium. Less than one gram of barium will kill an adult human. Here’s the full pdf of of the report: 2015-04-05 Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Google+ (Opens in new window) Related Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Notify me of follow-up comments by email. Notify me of new posts by email.