Always a pleasure to see we're in a good company. I've had the misfortune of being raised in this place:
https://maps.app.goo.gl/aXkHEfX42aNp2yxV9
Combine a large lead smelting plant with one of the world's largest producers of (unenriched) uranium, and a dozen other metals like copper and zinc. Add zero effective environmental regulation on top, and you get us.
According to government data, lead concentrations in the top soil are measured in hundreds to several thousands of milligrams per kilogram, depending on location. The norm is low dozens, if I am not mistaken.
No blood level studies have been done since the end of the 1980s. Thanks to this link, I at least have a reference point from a relatively transparent and accountable society. All I can say, back when I was in middle to high school, it felt like every other kid was diagnosed with anemia (yours truly included), and skin conditions like atopic dermatitis or recurring abscesses covering half the body were very common.
Personally I have never felt like having a sharp mind, but it's difficult to say how much impact lead may have had on this.
This is how it typically looks on the ground, if you're interested:
https://imgur.com/a/HyT1B5p
Don't know why I'm writing all this, I guess to let it be known that there are far worse places out there than a couple of small Australian towns (with what to me looks like very clean air).