Why do I smell sewer gas in my dwelling?

All drains and fixtures in a dwelling are supposed to be hooked to a vent pipe that extends up through the roof to expel back pressure in your plumbing system. Drains are protected from gas escaping into a dwelling by a "gooseneck" or water trap in the drain. This is true for floor drains, sinks, and toilets. If this water in the trap evaporates because of extended non-use, the gas can escape into the dwelling. A simple solution is to add water to that drain and any drain which is not used that often. If this does not solve the problem, it would be a good idea to have your venting system inspected.

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1. What do I do if my sewer backs up?
2. Will my homeowners insurance cover damage from sewer backups?
3. Why do I smell sewer gas in my dwelling?
4. Is it OK to flush "flushable" wipes?
5. The water in my toilet just sprayed into the air and made a mess. What's going on here?
6. Where can I dump the holding tank on my RV?
7. Can I put anti-freeze or motor oil down the drain?