The 2013 water quality report from Golden State Water company can be found at this url:
http://www.gswater.com/wp-content/uploads/2013/06/Water-Quality-2013-Sim...
Here's the main Simi Valley report page:
http://www.gswater.com/simivalleyCCR/
And here's the official report from the city itself. It's numbers differ from those from the Golden State Water Company:
http://www.simivalley.org/Modules/ShowDocument.aspx?documentid=3605
Other locals serviced by them (Ojai, Culver City, etc) can be found here:
http://www.gswater.com/annual-water-quality-reports/