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What are the safety concerns with methane in water wells?

The concerns about high concentrations of methane in water wells focus on the potential of this colorless and odorless gas to accumulate in confined spaces and act as an asphyxiant or become flammable or explosive in confined spaces containing oxygen and an ignition source. Mitigation of the gas can consist of enhanced venting of the well casing or making sure gas does not accumulate in confined spaces (basements) and removing any ignition source.