- 1). Turn water sources off while you work. You might be able to do this sink by sink, or you may choose to turn off the house water supply.
- 2). Get under your sink where the problem is most persistent. The P-trap is the curved joint under the sink. Remove this, and clean out any waste stuck inside. Do the same with other sinks to make sure all waste pathways are clear.
- 3). Empty the sump pump. A sump pump, often located in the basement or crawlspace, is a box that collects waste water and pumps it away from the house into a city sewer. Not all houses have sump pumps; areas where basement flooding is a common problem often utilize sump pumps. If the pump collects too much solid waste, water and gas may not have adequate space to separate and be released.
- 4). Climb up on the roof and check plumbing roof vents. Remove any leaves, branches or anything else stopping proper gas ventilation. If the gas can't be released through the vents, it will find other places to vent, such as your sink.
- 5). Install a backflow preventer to stop waste water from being sucked back up into the pipes and contaminating potable water sources. This is installed at the main water pipe into the house and at the water source of sprinklers.
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