Motmot Foundation Risk by ZIP Code ยท San Antonio & Central Texas ================================================================ File: motmot-foundation-risk-by-zip.csv Version: 2026-07-10 Rows: 333 ZIP codes across 35 Central Texas counties (331 scored; 2 downtown-Austin ZIPs have no residential soil data) Encoding: UTF-8, comma-separated, one header row Web page: https://motmotfoundationrepair.com/foundation-repair-statistics-san-antonio/ Map: https://motmotfoundationrepair.com/foundation-risk-map/ COLUMNS ------- zip 5-digit ZIP Code Tabulation Area city Primary USPS city for the ZIP county Texas county risk_score_0_99 Motmot's foundation-movement risk score. Linear extensibility rescaled to a 5-99 scale (round(LEP / 12 * 100), floored at 5, capped at 99). Empty where no soil data exists. risk_band High (72-99), Elevated (52-71), Moderate (34-51), Lower (5-33), or "No data". linear_extensibility_pct Soil linear extensibility percent (LEP), the USDA measure of shrink-swell: component-percent and depth-weighted mean over the top 100 cm of the dominant soils, averaged across sample points in the ZIP. Rounded to 0.1. primary_soil_driver Plain-language driver for the band: expansive clay (shrink-swell), seasonal clay movement, or thin soils over limestone & drainage. latitude, longitude ZIP centroid used for sampling. SOURCE AND METHOD ----------------- Soil measurements come from the USDA NRCS SSURGO database via Soil Data Access / Web Soil Survey (https://websoilsurvey.nrcs.usda.gov/app/). The risk score, bands, and driver labels are Motmot Foundation Repair's interpretation of that data, not a USDA product. A high score means the soil under a ZIP can move; it is not a diagnosis of any specific house. LICENSE ------- The underlying USDA NRCS measurements are US public domain. Motmot's compilation, scoring, and this file are licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/): use it, share it, build on it, including commercially, with credit. Credit: Motmot Foundation Repair, https://motmotfoundationrepair.com Suggested citation: Motmot Foundation Repair (2026). Foundation Risk by ZIP Code: San Antonio & Central Texas. Derived from USDA NRCS SSURGO soil survey data. https://motmotfoundationrepair.com/foundation-repair-statistics-san-antonio/ Note: the interactive Foundation Risk Map application remains CC BY-NC-ND 4.0; this dataset is licensed separately as above. Questions: get@motmotfoundationrepair.com | (210) 816-0034