> Searching the Internet had told us we are either fine or going to die.

Doing some quick math, if you’re starting at 0 μg/dl of lead in your blood, then at 0.5ppb you’d need to drink about 70 gallons of that water to get up to the CDC reference level of 3.5 μg/dl. This is assuming that all of that lead is absorbed into your bloodstream and your body isn’t clearing out the lead.

I think you’ll be okay. You can get your blood lead levels checked fairly cheaply if you’re concerned.