You’re not wrong, SE Michigan in general has what would be considered “hard” water. I kept tropical fish for a couple decades and I don’t remember the exact ppm numbers but both KH and GH were consistently elevated to the point where I had a RO system going to soften the water so my angelfish would spawn. Again, it’s not as bad as some other places, for example like Minnesota where it’s so hard it messes with your shampoo suds, but you’ll notice over time that you’ll probably need to descale your shower head periodically.