Rainwater collected in San Francisco on March 10th, 2016 tested positive for barium at 16μg/L. Other metals were at levels below reporting limits. Here’s the pdf of the full report: 2016-03-10 Leave a Reply Cancel reply Your email address will not be published.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.