A dry trap, poorly sealed fixture, venting problem, or sewer defect can let odors into a home. Run water in an infrequently used sink or floor drain first; if the smell remains or is strong, arrange an inspection. If you suspect natural gas instead, leave the building and call the gas utility.
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For more context about this type of plumbing issue, read our related Oklahoma City guide.
Read the related VIP plumbing guide