We've been fixing plumbing in Round Rock for over thirty years. The big thing here is you've got limestone on the west side and clay soil on the east, and that creates totally different problems depending on where your house is.
West of I-35 in neighborhoods like University Oaks and Forest Creek, you're on limestone. Great drainage, but tree roots go straight for your sewer lines looking for water. We're constantly dealing with root intrusion in those older clay pipes. East side - Preserve at Stone Oak, Round Rock Ranch - that's expansive clay. It swells when wet, shrinks when dry, and your plumbing connections take the stress.
Your water comes from Austin, and it's seriously hard. Water heaters fill with sediment fast. Tankless units need annual descaling. Faucet aerators clog in months instead of years. We factor this into every job because we've seen what happens when you don't.