Pond & Stock Tank Builders in Llano County, Texas

About pond & stock tank building in Llano County

A stock tank (what most Texans call a ranch pond) is the cheapest permanent water you can put on acreage — for cattle, wildlife, fishing, fire protection, or just the view. Building one means picking a spot that actually catches runoff, digging the basin with a dozer or excavator, and compacting a clay dam with a proper spillway so the first big rain doesn't wash it out. When the soil won't hold water, the fix is sealing: compacting a clay liner, working sodium bentonite into the basin, or installing a synthetic liner. The same crews also clean out silted-in tanks, repair leaking dams, and rebuild washed-out spillways. Most quarter- to half-acre ranch tanks in Central Texas take a few days of machine time.

Local factors in Llano County

Llano County is a hill country · granite country market covering 940 square miles, with pond & stock tank building work concentrated around Llano, Kingsland, Buchanan Dam, and Sunrise Beach. Granite geology adds 15–30% to well drilling cost — buyers accept it for the landscape.

What drives the cost of pond & stock tank building

• Machine time — Texas A&M AgriLife's 2026 survey puts stock tank construction at about $168/hour on average ($100–$300/hour) including operator and fuel
• Size and depth — total cubic yards of dirt moved is the real price driver; 8–10 ft of depth at center helps a tank survive drought
• Soil — clay that seals on its own is cheap; sandy or rocky ground needs bentonite or a liner
• Bentonite sealing — the clay itself is inexpensive in Texas (roughly $75–$130 per one-ton bag), but large basins need many tons plus the labor to work it in
• Dam and spillway — a properly keyed, compacted dam with a sized spillway costs more than a scraped hole and lasts decades longer
• Access and clearing — brush removal, rock, and mobilization to remote tracts add to the bill

Permits, licensing, and process

Texas does not license pond builders. On your own land, Texas Water Code §11.142 lets you build a dam or stock tank holding up to 200 acre-feet without a state water-rights permit, as long as the water is for domestic, livestock, or fish-and-wildlife use. Bigger dams, dams on a named river or creek channel, or ponds used for irrigation or commercial purposes may need a TCEQ water-rights permit. TCEQ's Dam Safety Program focuses on high- and significant-hazard dams, so a small ranch tank is typically outside routine inspection — but if a dam failure could flood a road or a house downstream, talk to an engineer first. Check with your county about floodplain rules and with your groundwater district if you plan to fill the tank from a well.

Common mistakes to avoid

• Digging where it looks good instead of where the runoff actually goes — a tank needs enough drainage area to fill
• Skipping the clay core and compaction in the dam — loose fill dams leak and fail
• Undersized spillway — the most common reason tanks wash out in a big Central Texas storm
• Going too shallow — shallow tanks dry up and grow moss in August
• Paying for bentonite before testing whether the native soil will seal with compaction alone

What to ask every contractor

• How many ponds or stock tanks have you built in this county, and can I see one?
• Do you price by the hour, by the cubic yard, or as a fixed bid?
• How will you build the dam — core trench, clay source, and compaction method?
• How big will the spillway be, and where will overflow water go?
• If it doesn't hold water, what is your plan and who pays for sealing?
• Do you carry general liability insurance?

Best time of year

Build in the dry months (late summer through winter) so the machines can work the clay, and the tank is ready to catch spring rain. A wet year is the worst time to dig and the best time to find out where water collects on your land.