Tanning Ledge Additions in Steiner Ranch, Texas

What the codes say about ledges, benches and steps

The CDC's Model Aquatic Health Code treats underwater shelves, which most owners call tanning ledges or sun shelves, as either a widened top tread of the pool stairs or a stand-alone area many feet in width and length, built so people can lounge in very shallow water, in chairs or on contoured loungers. The residential pool code's nearest limit is the 20-inch one for underwater seats and benches, set out below. Ledge Lounger, an in-pool furniture maker, says such shelves typically run 6 to 9 inches deep, and its fit guide says to take a ledge's length and width at the waterline, not along the coping, to sound the depth in a few spots since many ledges taper, and to check the slope, because a pronounced one can unsettle a chair.

For residential pools, the 2021 International Swimming Pool and Spa Code keeps the top of an underwater seat, bench or swimout within 20 inches of the design waterline. It calls for a means of entry and exit wherever a shallow area runs deeper than 24 inches, and it gives pool stairs treads at least 10 inches deep with 240 square inches of walking surface and risers no taller than 12 inches. Bubblers set into a ledge have their own placement rules: Pentair puts its ColorVision bubbler in 2 to 12 inches of water, at least 3 feet from walls and other bubblers, flush with the finish.

Travis County, WCID 17 and draining the pool

County permits and the City of Austin

Apart from about 325 acres in the City of Austin's limited-purpose jurisdiction, Steiner Ranch lies outside city limits, so building permits come from Travis County Development Services. The County's position is that any development in Travis County requires a permit, and it offers a residential permit for building a pool or spa, but its pages don't say whether adding a ledge to an existing pool needs one, so that question goes to the County before the drain-down. Checked against the City of Austin's jurisdiction map, a 40-point sample inside the Census boundary landed entirely within Austin's 2-mile extraterritorial jurisdiction (ETJ, the zone past a city's limits where that city still sets some rules), and that status can change one lot at a time.

Draining under County and district rules

Retrofitting a ledge means draining the pool completely. In unincorporated Travis County, only uncontaminated residential pool water that has been dechlorinated may go to a storm sewer or into state waters; filter backwash and saltwater are excluded. Under WCID 17's Stage 2 drought rules, draining and refilling are allowed only onto ground that soaks up the water, and only to lower rain-raised water, replace hazardous parts or repair a leak; a ledge addition isn't one of the listed reasons, so the drought stage is checked before work is booked. The Association adds that pool drains must meet local standards and may not drain into or across greenbelts, common areas, open space or neighboring lots without the committee's written approval.

WCID 17's water and new-pool standards

The district serves all of Steiner Ranch's Census area through 24-inch mains on Ranch Road 620 that fill two storage tanks holding 2 million gallons between them. Its 2025 report lists hardness at 185 ppm, calcium at 38.5 ppm and alkalinity at 156 ppm, with a pH of 7.81 sampled in 2024, and it describes the water as moderately hard to hard. Its 2023 conservation plan also sets standards for new pools, from no sand filters on private pools to a hose-end timer and a backflow preventer at the nearest hose bib, and says the district will write them into its rules.