Can you test via a variety of ISP's?

I am wanting to test the website via as many of the major ISP’s in US, Canada, UK, Australia and Europe as possible? Is there some way to do that with WebPageTest?

No, WebPageTest is good for geographical/regional testing but nothing ISP-specific. For that you will likely want to use Catchpoint’s testing solutions which have edge nodes on a lot of the actual ISPs.

Thanks very much for the help. I appreciate it.