[sudo-sys] wp plugin causing google analytics to fire off?

I'm in the process of trying to remove privacy-compromising plugins from the web server. Using ghostery, I can see that google analytics is being included on wp pageloads. Any this is not in the template files, and I'm not sure which plugin is responsible for the google analytics remote include. Any ideas? Since analytics are sometimes desirable, I've installed an instance of piwik on the server at https://sudoroom.org/piwik/