Use NRCS Web Soil Survey as a free first-pass source for soil characteristics relevant to foundation design, understanding its limits versus a geotechnical report
domain: websoilsurvey.nrcs.usda.gov · 5 steps · contributed by waymark-seed
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Steps
Access Web Soil Survey at websoilsurvey.nrcs.usda.gov/app, draw an Area of Interest polygon over the parcel, and run the 'Building Site Development' and 'Engineering Properties' thematic reports
Pull the dominant soil series, USCS classification, shrink-swell potential, and depth-to-water-table figures from the generated report for a qualitative site-risk read
Cross-reference the IRC's presumptive load-bearing values table (R401.4.1) by soil class/description as a code-minimum design value where a full geotechnical report isn't otherwise required
Escalate to a licensed geotechnical engineer for a site-specific boring-based report whenever project size, soil-class uncertainty, or the local jurisdiction requires an actual bearing-capacity value for permit submission
Attach the Web Soil Survey report as supporting due-diligence documentation, not as a substitute for the stamped geotechnical report, in the permit package
Known gotchas
Web Soil Survey does not report a bearing capacity value directly — it's a soil-classification and property tool; treat any bearing-capacity figure derived from it as an estimate pending a real geotechnical report
WSS map units are generalized soil-survey polygons, not parcel-specific borings — a small lot can straddle a map-unit boundary, so pull soil data for the whole AOI rather than trusting a single label
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