Whenever I see US maps for distribution of NTM, California is always highlighted as having higher levels. I have heard coastal communities generally have higher incidence of NTM. I don’t know why Santa Barbara’s rates would be any higher than LA or SF, or any other coastal community in CA.

There is some recent research into where NTM is more prevalent that indicates soil type can also be a factor.

What one needs to consider in deciding where to live is the whole picture, prevalence of NTM may be marginally more in one area than another, but there is also climate, geographical preference, proximity to work or family, cost of living, access to medical care, access to a major airport...

I don't believe there is enough difference from one location to another to make a decision solely on that basis. That said, I wouldn't choose high elevation due to less oxygen, or a swamp or backwater (possibly the highest exposure). But anywhaere else it would be just one factor.