Exempted aquifer

{
  "id": "MLC-T-ENV-010302",
  "term": "Exempted aquifer",
  "field": "Environment",
  "term_source": "Exempted Aquifer",
  "definition": "1. An aquifer, or a portion of an aquifer, that meets the criteria for a USDW, for which protection under the SDWA has been waived by the UIC Program. Under 40 CFR Part 146.4, an aquifer may be exempted if it is not currently being used - and will not be used in the future - as a drinking water source, or it is not reasonably expected to supply a public water system due to a high total dissolved solids content. Without an aquifer exemption, certain types of energy production, mining, or waste disposal into USDWs would be prohibited. EPA makes the final determination on granting all exemptions.\n\n2. Underground bodies of water defined in the Underground Injection Control program as aquifers that are potential sources of drinking water though not being used as such, and thus exempted from regulations barring underground injection activities.\n\n3. Aquifer or its portion that meets the criteria in the definition of ‘‘underground source of drinking water’’ but which has been exempted according to the procedures of § 144.8(b).\n\n4. Aquifer or its portion that meets the criteria in the definition of ‘‘underground source of drinking water’’ but which has been exempted according to the procedures in § 144.7.",
  "subject": "Natural environments",
  "references": [
    "Underground Injection Control Glossary",
    "Terms of Environment",
    "40 CFR 146.3 (CFR 2018)",
    "40 CFR 144.3 (CFR 2018)"
  ],
  "url": "https://mlchart.com/terminology/environment/exempted-aquifer/"
}