Aquifer

{
  "id": "MLC-T-ENV-002013",
  "term": "Aquifer",
  "field": "Environment",
  "definition": "1. A water-bearing layer of rock (including gravel and sand) that will yield water in usable quantity to a well or spring.\n\n2. A natural underground layer, often of sand or gravel, that contains water.\n\n3. A geologic formation capable of transmitting significant quantities of groundwater under normal hydraulic gradients.\n\n4. A geologic formation, group of formations or part of a formation that contains saturated permeable material that yields sufficient, economical quantities of groundwater.\n\n5. An aquifer is an underground rock formation composed of such materials as sand, soil, or gravel that can store ground water and supply it to wells and springs.\n\n6. A natural underground layer of porous, water-bearing materials (sand, gravel) usually capable of yielding a large amount or supply of water.\n\n7. An underground geological formation, or group of formations, containing water. Are sources of groundwater for wells and springs.\n\n8. An underground bed or stratum of earth, gravel or porous stone that contains water.\n\n9. (ACK-wi-fer) A natural underground layer of porous, water-bearing materials (sand, gravel) usually capable of yielding a large amount or supply of water.\n\n10. An underground formation or group of formations in rocks and soils containing enough ground water to supply wells and springs.\n\n11. An underground geological formation or group of formations, containing water. Aquifers are sources of groundwater for wells and springs.\n\n12. An underground rock formation composed of sand, soil, gravel, or porous rock that can store and supply groundwater to wells and springs.\n\n13. An underground geological formation, or group of formations, containing water. They are sources of groundwater for wells and springs. The LDC contains valid, historic aquifer codes and names as determined by the U.S. Geological Survey. The table can be downloaded from the Reference Tables Page (http://www.epa.gov/storpubl/legacy/ref_tables.htm).\n\n14. An aquifer is a geological formation or group of formations or part of a formation that is capable of yielding a significant amount of water to a drinking water well or spring.\n\n15. Rocks or unconsolidated sediments that are capable of yielding a significant amount of water to a well or a spring.\n\n16. An underground geological formation, or group of formations, containing water. A source of ground water for wells and springs.\n\n17. A body of permeable rock that can contain or transmit groundwater.\n\n18. A geologic formation, group of formations, or part of a formation that is saturated and sufficiently permeable to transmit water.\n\n19. Geological formation, group of formations, or portion of a formation capable of yielding significant quantities of ground water to wells or springs.\n\n20. Body of permeable rock that can contain or transmit groundwater.\n\n21. Geological formation, group of formations, or part of a formation that is capable of yielding a significant amount of water to a well or spring.[40 CFR 270.2 (CFR 2018)][40 CFR 149.2 (CFR 2018)][40 CFR 146.3 (CFR 2018)]\n\n22. Underground geological formation, group of formations, or part of a formation that is capable of yielding a significant amount of water to a well or spring.\n\n23. Edwards Underground Reservoir\n\n24. Water-bearing underground geological formation, group of formations, or part of a formation (excluding perched water bodies) that can yield a significant amount of ground water to a well or spring.\n\n25. Geologic formation, group of formations, or part of a formation capable of yielding a significant amount of ground water to wells or springs.\n\n26. A saturated, permeable geologic unit of sediment or rock that can transmit significant quantities of water under hydraulic gradients.\n\n27. One or more strata of rock or sediment that is saturated and sufficiently permeable to yield economically significant quantities of water to wells or springs. An aquifer includes any geologic material that is currently used or could be used as a source of water (for drinking or other purposes) within the target distance limit. All geologic materials combined into one aquifer are referred to as a single hydrologic unit.",
  "subject": "Water",
  "references": [
    "Environmental Issues Terms & Acronyms; Pesticides Glossary; Environmental Issues & Terms Glossary",
    "Safe Drinking Water Act Glossary; Drinking Water Glossary",
    "Underground Storage Tank Sites Guide Glossary; Office of Underground Storage Tanks Technical Terms; Glossary of Technical Terms: Office of Underground Storage Tanks",
    "Leaking Underground Storage Tanks Sites Glossary",
    "Waste and Cleanup Risk Assessment Glossary",
    "Watershed Protection Glossary",
    "RCRA Glossary of Terms; Terms of Environment",
    "Aquatic Biodiversity Glossary",
    "Drinking Water Technical & Legal Terms",
    "Private Wells Glossary",
    "Underground Injection Control Glossary",
    "Superfund for Students and Teachers Glossary; Abandoned Mine Lands (AML) Glossary",
    "STORET Legacy Data Center Glossary",
    "Underground Injection Control Terms",
    "Environmental Geophysics Glossary",
    "Glossary: Study of the Potential Impacts of Hydraulic Fracturing on Drinking Water Resources; EPA Study of the Potential Impacts of Hydraulic Fracturing on Drinking Water Resources: Progress Report at http://www.epa.gov/hfstudy/pdfs/hf-report20121214.pdf",
    "Chesapeake Bay Glossary",
    "EPA Guidance for Federal Land Management in the Chesapeake Bay Watershed Glossary at http://www.epa.gov/owow_keep/NPS/chesbay502/pdf/chesbay_glossary.pdf; Federal Land Management in the Chesapeake Bay Watershed Glossary",
    "40 CFR 258.2 (CFR 2013)",
    "40 CFR 144.3 (CFR 2018)",
    "40 CFR 191.12 (CFR 2018)",
    "40 CFR 149.101 (CFR 2018)",
    "40 CFR 197.12 (CFR 2019)",
    "40 CFR 260.10 (CFR 2020)",
    "NPS Agriculture Glossary; Nonpoint Pollution Source from Agriculture Glossary",
    "Hazard Ranking System Glossary"
  ],
  "url": "https://mlchart.com/terminology/environment/aquifer/"
}