At the six-digit level, NAICS 211130 identifies establishments whose principal activity is recovering natural gas — including associated gas produced alongside crude oil — from subsurface reservoirs. The code is the reference point for federal energy production surveys, environmental permitting databases, and workforce statistics that trade analysts use when assessing how domestic gas output affects LNG export capacity and pipeline import flows. Methane emissions reporting under EPA's Greenhouse Gas Reporting Program also ties to this NAICS classification, adding a regulatory dimension beyond pure trade analysis.

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