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Sara Heger, Ph.D., is an engineer, researcher and instructor in the Onsite Sewage Treatment Program in the Water Resources Center at the University of Minnesota. This seal will need to be replaced after maintenance. If a concrete lid is leaking odors out of the manhole, weather stripping or other materials can be used to create a temporary seal that will contain odors but still allow for proper maintenance of the tank. They must also be properly secured in place with lag screws or other fasteners. An improper seal on the pump tank lid – The newer plastic lids have a rubber seal that helps keep odors in the tank.An improper seal on an electrical conduit.If there is odor by the pump tank, it might be related to: Replace foam gaskets and lightly grease O-rings and grommets and reassemble. Remove the cover and flanges, and clean all sealing surfaces. Gaskets and seals on the pump basin may need maintenance.These plumbing vents can freeze closed during prolonged cold periods or get clogged with leaves or other debris. Without this vent, sinks, tubs and toilets would gurgle, traps dry out and odors come into the home. It’s necessary to allow the pressure in the drainpipes to equalize as wastewater flows through them. A common problem is the plumbing vent located on the roof.

Sometimes, the plugs are removed to clean sewer lines and not replaced. If the plug is missing, there's a direct path for sewer gas to bypass the water trap. Check for a clean-out plug inside the floor drain by removing the grate that covers the opening and making sure there's a plug inside the drain bowl.

A detailed interior plumbing inspection may be needed. In some older homes it’s possible the venting was not properly connected as fixtures or additions were added to home.

Check for improper or outdated plumbing.

Make sure all traps in the basement have water in them to prevent sewer gas from coming back into the home.

If there is an odor from a sewage pump in the basement consider these steps: Even if the smell comes and goes, it needs to be addressed. It affects people and pets that are exposed to it over a long period of time. Prolonged exposure to sewer gas can cause irritability, headaches, fatigue, sinus infections, bronchitis, pneumonia, loss of appetite, poor memory and dizziness. Hydrogen sulfide is dangerous even at low levels. When property owners complain they have sewer gas smells by a sewage ejector or grinder in the basement or by their pump tank, you should take that complaint seriously. Get Systems/ATUs articles, news and videos right in your inbox! Sign up now.