Short answer: Off municipal service, a custom home on Hill Country acreage needs a private well and an aerobic septic system — commonly $20,000–$40,000+ combined — plus a plan for power and, increasingly, energy independence. These aren’t afterthoughts; they shape your site plan and budget.
Private wells
Water depth, yield, and quality vary across the Hill Country. A well is drilled, cased, and paired with a pump and often a storage/treatment system. Testing the water and confirming yield early prevents surprises.
Aerobic septic systems
Most acreage homes use an aerobic (aerated) septic system, which treats wastewater and disperses it via a sprinkler field. It requires permitting, a licensed installer, and ongoing maintenance. Our septic systems guide explains the details.
Power and going off-grid
Bringing utility power to a remote homesite can be costly, which is pushing more buyers toward solar-plus-battery and energy-independent designs. Planning utilities alongside the home — not after — keeps the budget and site plan coherent. See our farm and ranch building guide.
Frequently asked questions
How much do a well and septic cost?
Commonly $20,000–$40,000+ combined, more for deep wells or challenging drainfields.
Do I need to test the water?
Yes — confirm yield and quality before finalizing the home’s location and mechanical design.
Request a free consultation to plan utilities for your acreage build.