Depending on which resource you read, any boiling water is OK to drink (from a microbe perspective). Others say roiling boil for 10 minutes, some say the boil time changes based on altitude (since the boiling point temp changes)... yada yada yada, you can find support online for any of those positions.

I pretty much think once it boils, it's good. I haven't met a bacteria yet that lives past about 180 or so.

Then again, I'm a filter man myself.