Similar here. The city spent billions a couple decades ago to replace mains, and had assistance for lower income homeowners but the cost of the waterline to a house, and everything in the house, was always on the homeowner.

Now they’re trying to create an inventory of what remains

My house has a copper water line, plus all the water pipes inside are copper. However given the age of my house, I have to assume they were replaced at some point. Given the drain lines are a mix of iron and galvanized and look older than the water lines …. And that copper is likely old enough to use lead solder which is not as easily checked