{"id":15125,"date":"2026-11-02T15:43:32","date_gmt":"2026-11-02T14:43:32","guid":{"rendered":"https:\/\/geopard.tech\/soil-sampling-regulations\/united-states\/texas\/"},"modified":"2026-11-03T04:47:50","modified_gmt":"2026-11-03T03:47:50","slug":"texas","status":"publish","type":"page","link":"https:\/\/geopard.tech\/nor\/soil-sampling-regulations\/united-states\/texas\/","title":{"rendered":"Soil sampling requirements in Texas"},"content":{"rendered":"\n<div class=\"gp-ssr\" data-theme=\"light\">\n<style>\n\/* ===== theme chrome (rule 7). Header + footer kept; only the duplicate WP page\n   title (a bare h1 in #simple_page > .container) is hidden. 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TCEQ regulatory guidance for concentrated animal feeding operations (official guidance): Before waste application begins, and after it begins.\"}},{\"@type\":\"Question\",\"name\":\"How many acres can one soil sample cover in Texas?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Texas A and M AgriLife Extension, Procedure for Taking Soil Samples (official guidance): One composite sample for every 10 to 40 acres (4.05 to 16.19 ha).\"}},{\"@type\":\"Question\",\"name\":\"How deep should soil samples be taken in Texas?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Texas A and M AgriLife Extension, Procedure for Taking Soil Samples (official guidance): 0 to 6 inches (0 to 15.24 cm). TCEQ regulatory guidance for concentrated animal feeding operations (official guidance): 0 to 6 inches (0 to 15.24 cm) and 6 to 24 inches (15.24 to 60.96 cm). Where 0 to 2 and 2 to 6 inch samples (0 to 5.08 and 5.08 to 15.24 cm) are required, take the 0 to 6 inch sample and divide it.\"}},{\"@type\":\"Question\",\"name\":\"How many cores go into one soil sample in Texas?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Texas A and M AgriLife Extension, Procedure for Taking Soil Samples (official guidance): 10 to 15 cores per composite (one core, then 9 to 14 more). TCEQ regulatory guidance for concentrated animal feeding operations (official guidance): 10 to 15 subsamples per depth per LMU, preferably 15.\"}},{\"@type\":\"Question\",\"name\":\"How many soil samples does a 100-acre field need in Texas?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Under Texas A and M AgriLife Extension, Procedure for Taking Soil Samples: A uniform 100-acre field needs at least 3 composite samples of no more than 40 acres each, and at least 30 cores in all, 10 per sample.\"}}]}<\/script>\n<div class=\"ssr-hero ssr-hero-country\"><nav class=\"ssr-crumbs\" aria-label=\"Breadcrumb\"><a href=\"https:\/\/geopard.tech\/soil-sampling-regulations\/\">Soil sampling regulations<\/a> <span aria-hidden=\"true\">\/<\/span> <a href=\"https:\/\/geopard.tech\/soil-sampling-regulations\/united-states\/\">United States<\/a> <span aria-hidden=\"true\">\/<\/span> <span aria-current=\"page\">Texas<\/span><\/nav><h1>Soil sampling requirements in Texas<\/h1><p class=\"ssr-lede\">State guidance: Texas A and M AgriLife Extension, Procedure for Taking Soil Samples and TCEQ regulatory guidance for concentrated animal feeding operations.<\/p><\/div><section class=\"ssr-ans\" aria-labelledby=\"ssr-ans-h\"><h2 id=\"ssr-ans-h\">Soil sampling in Texas: frequency, area, depth and cores<\/h2><div class=\"ssr-ans-grid\"><div class=\"ssr-ans-q\"><h3>How often do you need to soil sample in Texas?<\/h3><ul data-no-translation><li><a href=\"#rule-us-tx-tceq-rg-408-cafo-soil-sampling\">TCEQ regulatory guidance for concentrated animal feeding operations<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> GPS grid method: sampled annually on the same grid layout.<\/li><\/ul><\/div><div class=\"ssr-ans-q\"><h3>When in the year should soil be sampled in Texas?<\/h3><ul data-no-translation><li><a href=\"#rule-us-tx-agrilife-soil-sampling\">Texas A and M AgriLife Extension, Procedure for Taking Soil Samples<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> At least 2 months after the last fertilization.<\/li><li><a href=\"#rule-us-tx-tceq-rg-408-cafo-soil-sampling\">TCEQ regulatory guidance for concentrated animal feeding operations<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> Before waste application begins, and after it begins.<\/li><\/ul><\/div><div class=\"ssr-ans-q\"><h3>How many acres can one soil sample cover in Texas?<\/h3><ul data-no-translation><li><a href=\"#rule-us-tx-agrilife-soil-sampling\">Texas A and M AgriLife Extension, Procedure for Taking Soil Samples<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> One composite sample for every 10 to 40 acres (4.05 to 16.19 ha).<\/li><\/ul><\/div><div class=\"ssr-ans-q\"><h3>How deep should soil samples be taken in Texas?<\/h3><ul data-no-translation><li><a href=\"#rule-us-tx-agrilife-soil-sampling\">Texas A and M AgriLife Extension, Procedure for Taking Soil Samples<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> 0 to 6 inches (0 to 15.24 cm).<\/li><li><a href=\"#rule-us-tx-tceq-rg-408-cafo-soil-sampling\">TCEQ regulatory guidance for concentrated animal feeding operations<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> 0 to 6 inches (0 to 15.24 cm) and 6 to 24 inches (15.24 to 60.96 cm). Where 0 to 2 and 2 to 6 inch samples (0 to 5.08 and 5.08 to 15.24 cm) are required, take the 0 to 6 inch sample and divide it.<\/li><\/ul><\/div><div class=\"ssr-ans-q\"><h3>How many cores go into one soil sample in Texas?<\/h3><ul data-no-translation><li><a href=\"#rule-us-tx-agrilife-soil-sampling\">Texas A and M AgriLife Extension, Procedure for Taking Soil Samples<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> 10 to 15 cores per composite (one core, then 9 to 14 more).<\/li><li><a href=\"#rule-us-tx-tceq-rg-408-cafo-soil-sampling\">TCEQ regulatory guidance for concentrated animal feeding operations<\/a> <span class=\"ssr-ans-t\">Official guidance<\/span> 10 to 15 subsamples per depth per LMU, preferably 15.<\/li><\/ul><\/div><div class=\"ssr-ans-ex\"><h3>How many soil samples does a 100-acre field need in Texas?<\/h3><p><span data-no-translation>Texas A and M AgriLife Extension, Procedure for Taking Soil Samples:<\/span> A uniform 100-acre field needs at least 3 composite samples of no more than 40 acres each, and at least 30 cores in all, 10 per sample.<\/p><p><a href=\"https:\/\/geopard.tech\/soil-sampling-regulations\/#ssr-est\">Samples and cores for any field size<\/a><\/p><\/div><\/div><\/section>\n<section aria-label=\"Rules in Texas\">\n<div class=\"ssr-scroll\" data-no-translation>\n<table class=\"ssr-table\" role=\"table\" aria-label=\"Soil sampling rules in Texas\">\n<caption>Soil sampling rules in Texas, with the exact wording of each source<\/caption>\n<colgroup><col class=\"c-place\"><col class=\"c-pur\"><col class=\"c-time\"><col class=\"c-area\"><col class=\"c-meth\"><col class=\"c-depth\"><col class=\"c-cores\"><col class=\"c-stat\"><\/colgroup>\n      <thead role=\"rowgroup\"><tr role=\"row\">\n        <th role=\"columnheader\" scope=\"col\">Country \/ region<\/th>\n        <th role=\"columnheader\" scope=\"col\">Purpose \/ programme<\/th>\n        <th role=\"columnheader\" scope=\"col\">Time \/ frequency<\/th>\n        <th role=\"columnheader\" scope=\"col\">Area per sample<\/th>\n        <th role=\"columnheader\" scope=\"col\">Method<\/th>\n        <th role=\"columnheader\" scope=\"col\">Depth<\/th>\n        <th role=\"columnheader\" scope=\"col\">Cores<\/th>\n        <th role=\"columnheader\" scope=\"col\">Status and source<\/th>\n      <\/tr><\/thead>\n<tbody class=\"ssr-grp\" data-g=\"US\" role=\"rowgroup\"><tr role=\"row\"><th role=\"rowheader\" colspan=\"8\" scope=\"colgroup\" id=\"country-us\">United States<\/th><\/tr><\/tbody>\n<tbody id=\"rule-us-tx-agrilife-soil-sampling\" class=\"ssr-rec\" role=\"rowgroup\" data-c=\"US\" data-r=\"US-TX\" data-p=\"fertility\" data-s=\"official_guidance\" data-m=\"zone\" data-q=\"united states | texas | texas a and m agrilife extension, procedure for taking soil samples | routine soil fertility sampling | texas a and m agrilife extension soil, water and forage testing laboratory, soil sample information form, procedure for taking soil samples | ph, p, k, mg | texas | tx | texas a and m | agrilife | agrilife extension | soil water and forage testing laboratory\">\n<tr role=\"row\" class=\"ssr-main\"><th role=\"rowheader\" scope=\"row\" data-label=\"Country \/ region\"><span class=\"ssr-place\">Texas<\/span><span class=\"ssr-sub\">United States<\/span><span class=\"ssr-sub\">Texas only. Other states set their own rules.<\/span><\/th><td role=\"cell\" data-label=\"Purpose \/ programme\"><span class=\"ssr-pur\">Routine soil fertility sampling<\/span><span class=\"ssr-sub\">Texas A and M AgriLife Extension, Procedure for Taking Soil Samples<\/span><\/td><td role=\"cell\" data-label=\"Time \/ frequency\"><ul class=\"ssr-time\"><li><span class=\"k\">Wait<\/span> At least 2 months after the last fertilization<\/li><\/ul><\/td><td role=\"cell\" data-label=\"Area per sample\">One composite sample for every 10 to 40 acres (4.05 to 16.19 ha)<\/td><td role=\"cell\" data-label=\"Method\">Separate samples for different soil types, land uses or fertilizer rates, cropping histories and terrain. Avoid fertilizer bands, small gullies, depressions, terraces, waterways and unusual areas.<\/td><td role=\"cell\" data-label=\"Depth\">0 to 6 inches (0 to 15.24 cm)<\/td><td role=\"cell\" data-label=\"Cores\">10 to 15 cores per composite (one core, then 9 to 14 more)<\/td><td role=\"cell\" data-label=\"Status and source\" class=\"ssr-stat\"><span class=\"ssr-badge is-official_guidance\">Official guidance<\/span><a class=\"ssr-src\" href=\"https:\/\/soiltesting.tamu.edu\/soiltesting\/wp-content\/uploads\/sites\/13\/2023\/05\/soilwebform.pdf\" data-ssr-src rel=\"noopener\">Texas A and M AgriLife Extension, Soil Sample Information Form (PDF)<\/a><\/td><\/tr>\n<tr role=\"row\" class=\"ssr-more\"><td role=\"cell\" colspan=\"8\"><details data-id=\"us-tx-agrilife-soil-sampling\" data-c=\"Texas\"><summary>Who it applies to, the exact wording and every source<\/summary><div class=\"ssr-det\"><dl class=\"ssr-facts\"><div><dt>Who it applies to<\/dt><dd>Advice from the public land-grant university extension laboratory for Texas. Not law.<\/dd><\/div><div><dt>In force from<\/dt><dd>Under review<\/dd><\/div><div><dt>Legal text<\/dt><dd>Texas A and M AgriLife Extension Soil, Water and Forage Testing Laboratory, Soil Sample Information Form, Procedure for Taking Soil Samples<\/dd><\/div><\/dl><div class=\"ssr-wording\"><h3>The wording in the source<\/h3><h4>Timing<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">When sampling fertilized fields, avoid sampling directly in fertilized band and wait at least 2 months after last fertilization.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/soiltesting.tamu.edu\/soiltesting\/wp-content\/uploads\/sites\/13\/2023\/05\/soilwebform.pdf\" data-ssr-src rel=\"noopener\">step 3<\/a><\/p><\/li><\/ul><h4>Area per sample<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Take one composite sample for every 10 to 40 acres.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/soiltesting.tamu.edu\/soiltesting\/wp-content\/uploads\/sites\/13\/2023\/05\/soilwebform.pdf\" data-ssr-src rel=\"noopener\">Procedure for Taking Soil Samples, step 1<\/a><\/p><\/li><\/ul><h4>Method<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">A separate sample should be taken for:<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/soiltesting.tamu.edu\/soiltesting\/wp-content\/uploads\/sites\/13\/2023\/05\/soilwebform.pdf\" data-ssr-src rel=\"noopener\">step 1, followed by: areas with different soil types; different land uses or fertilizer application rates; different cropping histories; different terrain<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Areas with different soil types<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/soiltesting.tamu.edu\/soiltesting\/wp-content\/uploads\/sites\/13\/2023\/05\/soilwebform.pdf\" data-ssr-src rel=\"noopener\">step 1(a)<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Areas with different land uses or fertilizer application rates<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/soiltesting.tamu.edu\/soiltesting\/wp-content\/uploads\/sites\/13\/2023\/05\/soilwebform.pdf\" data-ssr-src rel=\"noopener\">step 1(b)<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Areas with different cropping histories (species and yields)<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/soiltesting.tamu.edu\/soiltesting\/wp-content\/uploads\/sites\/13\/2023\/05\/soilwebform.pdf\" data-ssr-src rel=\"noopener\">step 1(c)<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Areas with different terrain<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/soiltesting.tamu.edu\/soiltesting\/wp-content\/uploads\/sites\/13\/2023\/05\/soilwebform.pdf\" data-ssr-src rel=\"noopener\">step 1(d)<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Avoid sampling areas such as small gullies, slight field depressions, terrace, waterways, or unusual areas.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/soiltesting.tamu.edu\/soiltesting\/wp-content\/uploads\/sites\/13\/2023\/05\/soilwebform.pdf\" data-ssr-src rel=\"noopener\">step 2<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">When sampling fertilized fields, avoid sampling directly in fertilized band<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/soiltesting.tamu.edu\/soiltesting\/wp-content\/uploads\/sites\/13\/2023\/05\/soilwebform.pdf\" data-ssr-src rel=\"noopener\">step 3<\/a><\/p><\/li><\/ul><h4>Depth<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Take a 0-6 inch sample, insure equal soil throughout this six inch depth.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/soiltesting.tamu.edu\/soiltesting\/wp-content\/uploads\/sites\/13\/2023\/05\/soilwebform.pdf\" data-ssr-src rel=\"noopener\">step 6<\/a><\/p><\/li><\/ul><h4>Cores<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">It is important to repeat steps 4-6 an additional 9 to 14 times for each area identified in steps 1-3.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/soiltesting.tamu.edu\/soiltesting\/wp-content\/uploads\/sites\/13\/2023\/05\/soilwebform.pdf\" data-ssr-src rel=\"noopener\">step 7<\/a><\/p><\/li><\/ul><\/div><div class=\"ssr-srcbox\"><h3>Sources<\/h3><ul class=\"ssr-srcs\"><li><a href=\"https:\/\/soiltesting.tamu.edu\/soiltesting\/wp-content\/uploads\/sites\/13\/2023\/05\/soilwebform.pdf\" data-ssr-src rel=\"noopener\">Texas A and M AgriLife Extension, Soil Sample Information Form (PDF)<\/a> <span class=\"ssr-kind\">Guidance<\/span><\/li><\/ul><p class=\"ssr-dates\">Sources re-checked every two months, last update October 2026. Reviewed by GeoPard editorial team.<\/p><\/div><\/div><\/details><\/td><\/tr>\n<\/tbody>\n<tbody id=\"rule-us-tx-tceq-rg-408-cafo-soil-sampling\" class=\"ssr-rec\" role=\"rowgroup\" data-c=\"US\" data-r=\"US-TX\" data-p=\"fertility\" data-s=\"official_guidance\" data-m=\"grid representative\" data-q=\"united states | texas | tceq regulatory guidance for concentrated animal feeding operations | soil monitoring on cafo waste application fields | tceq rg-408, soil sampling for concentrated animal-feeding operations (cafos), revised december 2017 | ph, p, k, mg | texas | tx | tceq | rg-408 | cafo | concentrated animal feeding operation | land management unit | lmu\">\n<tr role=\"row\" class=\"ssr-main\"><th role=\"rowheader\" scope=\"row\" data-label=\"Country \/ region\"><span class=\"ssr-place\">Texas<\/span><span class=\"ssr-sub\">United States<\/span><span class=\"ssr-sub\">Texas only. Other states set their own rules.<\/span><\/th><td role=\"cell\" data-label=\"Purpose \/ programme\"><span class=\"ssr-pur\">Soil monitoring on CAFO waste application fields<\/span><span class=\"ssr-sub\">TCEQ regulatory guidance for concentrated animal feeding operations<\/span><\/td><td role=\"cell\" data-label=\"Time \/ frequency\"><ul class=\"ssr-time\"><li><span class=\"k\">Season<\/span> Before waste application begins, and after it begins<\/li><li><span class=\"k\">Repeat<\/span> GPS grid method: sampled annually on the same grid layout<\/li><\/ul><\/td><td role=\"cell\" data-label=\"Area per sample\"><span class=\"ssr-ns\">Not specified<\/span><\/td><td role=\"cell\" data-label=\"Method\">Composite per land management unit (LMU). Subsample locations by professional judgment, grid with random selection, or GPS grid.<\/td><td role=\"cell\" data-label=\"Depth\">0 to 6 inches (0 to 15.24 cm) and 6 to 24 inches (15.24 to 60.96 cm). Where 0 to 2 and 2 to 6 inch samples (0 to 5.08 and 5.08 to 15.24 cm) are required, take the 0 to 6 inch sample and divide it.<\/td><td role=\"cell\" data-label=\"Cores\">10 to 15 subsamples per depth per LMU, preferably 15<\/td><td role=\"cell\" data-label=\"Status and source\" class=\"ssr-stat\"><span class=\"ssr-badge is-official_guidance\">Official guidance<\/span><a class=\"ssr-src\" href=\"https:\/\/www.tceq.texas.gov\/downloads\/permitting\/wastewater\/agriculture\/regulatory-guidance\/rg-408.pdf\" data-ssr-src rel=\"noopener\">TCEQ RG-408, Soil Sampling for CAFOs (PDF)<\/a><\/td><\/tr>\n<tr role=\"row\" class=\"ssr-more\"><td role=\"cell\" colspan=\"8\"><details data-id=\"us-tx-tceq-rg-408-cafo-soil-sampling\" data-c=\"Texas\"><summary>Who it applies to, the exact wording and every source<\/summary><div class=\"ssr-det\"><dl class=\"ssr-facts\"><div><dt>Who it applies to<\/dt><dd>State agency guidance for CAFOs that apply animal waste to land. Not law: the requirements sit in 30 TAC Chapter 321, Subchapter B and the CAFO general permit.<\/dd><\/div><div><dt>Laboratory and analysis<\/dt><dd>An agronomic soil laboratory, using the test methods in the Texas A and M AgriLife Soil, Water and Forage Testing Laboratory procedures.<\/dd><\/div><div><dt>Field identifiers<\/dt><dd>GPS each subsample location and keep it for two years (grid and GPS grid methods).<\/dd><\/div><div><dt>In force from<\/dt><dd>Under review<\/dd><\/div><div><dt>Legal text<\/dt><dd>TCEQ RG-408, Soil Sampling for Concentrated Animal-Feeding Operations (CAFOs), revised December 2017<\/dd><\/div><\/dl><div class=\"ssr-wording\"><h3>The wording in the source<\/h3><h4>Timing<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Before you begin to apply waste, and after you begin applying waste in accordance with the CAFO rules and General Permit, you are required to collect and analyze representative soil samples from each permitted land management unit (LMU)<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.tceq.texas.gov\/downloads\/permitting\/wastewater\/agriculture\/regulatory-guidance\/rg-408.pdf\" data-ssr-src rel=\"noopener\">RG-408 p. 1, What is the purpose of soil sampling?<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">Sampling is conducted annually using the same grid layout to improve field sub-sampling consistency.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.tceq.texas.gov\/downloads\/permitting\/wastewater\/agriculture\/regulatory-guidance\/rg-408.pdf\" data-ssr-src rel=\"noopener\">RG-408 p. 3, GPS Grid Method<\/a><\/p><\/li><\/ul><h4>Method<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Methods for locating subsamples include the following: professional judgment, grid and GPS Grid.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.tceq.texas.gov\/downloads\/permitting\/wastewater\/agriculture\/regulatory-guidance\/rg-408.pdf\" data-ssr-src rel=\"noopener\">RG-408 p. 2<\/a><\/p><\/li><\/ul><h4>Depth<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">If you are required to take 0\u20132 in and 2\u20136 in samples, collect a 0\u20136 in sample and divide according to depth.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.tceq.texas.gov\/downloads\/permitting\/wastewater\/agriculture\/regulatory-guidance\/rg-408.pdf\" data-ssr-src rel=\"noopener\">RG-408 p. 2<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">If you cannot collect the entire 6\u201324 in sample for more than the minimum 10 subsamples, specify the average depth that was obtained for the LMU.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.tceq.texas.gov\/downloads\/permitting\/wastewater\/agriculture\/regulatory-guidance\/rg-408.pdf\" data-ssr-src rel=\"noopener\">RG-408 p. 3<\/a><\/p><\/li><\/ul><h4>Cores<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">A representative composite sample typically should be composed of a composite of 10 to 15 (preferably 15) discrete subsamples for each depth increment within an LMU<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.tceq.texas.gov\/downloads\/permitting\/wastewater\/agriculture\/regulatory-guidance\/rg-408.pdf\" data-ssr-src rel=\"noopener\">RG-408 p. 2<\/a><\/p><\/li><\/ul><h4>Laboratory and analysis<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">Coordinate with an agronomic soil laboratory<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.tceq.texas.gov\/downloads\/permitting\/wastewater\/agriculture\/regulatory-guidance\/rg-408.pdf\" data-ssr-src rel=\"noopener\">RG-408 p. 1<\/a><\/p><\/li><li><blockquote class=\"ssr-q\" lang=\"en\">appropriate soil test methodology found in the Standard Operating Procedures (SOPs) for the Texas AgriLife Extension Service Soil, Water and Forage Testing Laboratory.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.tceq.texas.gov\/downloads\/permitting\/wastewater\/agriculture\/regulatory-guidance\/rg-408.pdf\" data-ssr-src rel=\"noopener\">RG-408 p. 2<\/a><\/p><\/li><\/ul><h4>Field identifiers<\/h4><ul class=\"ssr-quotes\"><li><blockquote class=\"ssr-q\" lang=\"en\">GPS each subsample location and maintain the information for a period of two years.<\/blockquote><p class=\"ssr-q-cite\"><a href=\"https:\/\/www.tceq.texas.gov\/downloads\/permitting\/wastewater\/agriculture\/regulatory-guidance\/rg-408.pdf\" data-ssr-src rel=\"noopener\">RG-408 p. 3, Grid Sampling and GPS Grid methods<\/a><\/p><\/li><\/ul><\/div><div class=\"ssr-srcbox\"><h3>Sources<\/h3><ul class=\"ssr-srcs\"><li><a href=\"https:\/\/www.tceq.texas.gov\/downloads\/permitting\/wastewater\/agriculture\/regulatory-guidance\/rg-408.pdf\" data-ssr-src rel=\"noopener\">TCEQ RG-408, Soil Sampling for CAFOs (PDF)<\/a> <span class=\"ssr-kind\">Guidance<\/span><\/li><\/ul><p class=\"ssr-dates\">Sources re-checked every two months, last update October 2026. Reviewed by GeoPard editorial team.<\/p><\/div><\/div><\/details><\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"ssr-back\"><a href=\"https:\/\/geopard.tech\/soil-sampling-regulations\/united-states\/\">United States: federal rules and every other state<\/a><\/p>\n<p class=\"ssr-back\"><a href=\"https:\/\/geopard.tech\/soil-sampling-regulations\/\">Soil sampling regulations in every country<\/a><\/p>\n<p class=\"ssr-back\">Report an outdated requirement: <a href=\"mailto:info@geopard.tech?subject=Soil%20sampling%20regulations%20correction\">info@geopard.tech<\/a><\/p>\n<\/section>\n<\/div>\n\n\n\n<div class=\"gp-ssr\">\n<section class=\"ssr-cta-sec\">\n  <div class=\"ssr-cta\">\n    <h2>Plan the points to the rule that applies<\/h2>\n    <p>Set the area per sample, the cores and the depth your rule asks for. GeoPard places the points on a grid or by zone, routes the walk, prints the labels and takes the plan to the field on a phone.<\/p>\n    <div class=\"ssr-hero-btns\">\n      <a class=\"ssr-btn\" id=\"ssr-cta-main\" href=\"https:\/\/app.geopard.tech\/auth\/sign-up?utm_source=geopard.tech&amp;utm_medium=lead-magnet&amp;utm_campaign=soil-sampling-regulations&amp;utm_content=below-tool-cta\">Create a sampling plan<\/a>\n      <a class=\"ssr-btn-ghost\" id=\"ssr-cta-planner\" href=\"https:\/\/geopard.tech\/soil-sampling\/\">See the Soil Sampling Planner<\/a>\n    <\/div>\n  <\/div>\n<\/section>\n<p class=\"ssr-legal\">A planning reference built from official sources, not legal advice. Rules apply by jurisdiction, nutrient, land use and programme: check the current official text and your laboratory&#8217;s instructions before fieldwork.<\/p>\n<\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>Soil sampling regulations \/ United States \/ Texas Soil sampling requirements in Texas State guidance: Texas A and M AgriLife Extension, Procedure for Taking Soil&#8230;<\/p>","protected":false},"author":210157960,"featured_media":0,"parent":14962,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_eb_attr":"","content-type":"","_wpcom_ai_launchpad_about_page":false,"_wpcom_ai_launchpad_gallery_page":false,"_wpcom_ai_launchpad_contact_page":false,"_wpcom_ai_launchpad_events_page":false,"_wpcom_ai_launchpad_video_page":false,"_wpcom_ai_launchpad_portfolio_piece":false,"_jetpack_hide_featured_image":false,"_jetpack_featured_image_duplicate_dismissed":0,"footnotes":"","big_sky_generated":false},"class_list":["post-15125","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - 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