Engineering coverage in all 254 Texas counties

Eighteen counties from the Guadalupe delta to the King Ranch. Seven of them sit inside the windstorm catastrophe area, which makes WPI-8 certification the defining requirement of building here.

Corpus Christi, Victoria, Rockport, Port Lavaca

Sixteen counties from the Brazos bottoms to the Sabine. The highest plasticity clays in Texas, measurable ground subsidence, and a windstorm line that runs through Harris County itself.

Houston, Galveston, Beaumont, The Woodlands

Sixty five counties, from the Metroplex east to the Louisiana line and north to the Red River. Blackland Prairie clay under the western half, piney woods sands under the eastern, and the most damaging hail in the country over all of it.

Dallas, Fort Worth, Tyler, Denton

Thirteen counties along the Balcones Escarpment. The single most useful fact about engineering here is that the escarpment runs through Bexar County, and the soil on either side of it is not the same soil.

San Antonio, New Braunfels, Kerrville, Boerne

Thirty counties from the Hill Country through the Blackland Prairie to the Brazos Valley, containing both the most demanding development review process in Texas and counties that require no building permit at all.

Austin, Round Rock, Waco, Killeen

Sixteen counties along the river from Brownsville to Del Rio. Two of them are inside the windstorm catastrophe area and the rest are not, which is the distinction that decides what a project here actually needs.

McAllen, Brownsville, Harlingen, Laredo

Fifty five counties spanning nearly six hundred miles. Low plasticity soils that make foundations simpler, collapsible and gypsum bearing soils that make them harder, and distances that make how a firm is organized matter as much as what it knows.

El Paso, Midland, Odessa, San Angelo

Forty one counties on the Llano Estacado and the caprock. The most consistently wind exposed terrain in Texas, the deepest frost penetration in the state, and forty one counties where a lender is more often the reason for an engineer's seal than a building department is.

Amarillo, Lubbock, Plainview, Pampa