California wildfire now tainting 85 percent of San Francisco's drinking water SEE

http://www.dailymail.co.uk/news/article-2402158/Yosemite-San-Francisco-power-water-supply-danger.html

California wildfire now tainting 85 percent of San Francisco's drinking water as massive blaze rains ash down into the city's largest reservoir

With radioactive isotopes.

http://www.seychelle.com/

There's one other manufacturer here in the US that also makes RAD filters. I forget who. I use seychelle personally, but anything that works, works.