A: Sump pumps, like any other drains, need a trap to hold water to prevent sewer gas from backing up and entering the home. If a drain is not used for two or three weeks, the water in the trap can evaporate and allow sewer gas to enter, so it is important to make sure there is always some water in the trap.

Does the sump actually pump the water or is it natural flow? Is there a trap between the septic and the sump, which is always covered by water? Water has to be over the outgoing pipe if there is a running trap on the drainage side.

If the drain is on the side of the sump, try pouring enough water in the sump to cover the outgoing drain line. If the drain goes out the bottom on the sump, there should be a trap below the sump.

You may need to call a plumber to take a look at it, and make sure the sump pump is installed and draining properly, with a trap.

To locate someone to check that out for you, visit Home Advisor. Type "Repair a Sump Pump" in the search box, fill out the service request, and be matched with the ideal service professional in your area.

-- Tips courtesy of HomeAdvisor.com