I being plagued with sewer gas how can i stop this

Most probably it is because the ventilation pipe on the sink is not exhausting the methane gas properly, so the methane/rotten egg smell is coming out of the drain. Sometimes if vent pipes are not angled properly, the gas/smell will not rise properly. If there is no ventilation pipe hooked up to the sink, you will most probably smell it. Good luck.

is there a trap in the sink drain just under the sink
if not put one in
a trap holds water in a bend so sewer gases dont come up through the drain

Suppose you plugged the drain of the sink and filled the basin with water, then removed the plug. I must think that only after the basin empties you would get the sewer smell, and the smell would persist until you slowly ran some more water. If you try this, and this is the result, then the problem is that the sewer vent (that is supposed to prevent the water in the trap under the sink from being sucked down the drain) is not working right. If this is a new problem then you may be able to clear what is probably a blocked vent pipe. If this bathroom has always had this problem, then you have a poorly designed or executed vent pipe setup that you can only fix it with some surgery to your plumbing. However, to clean the vent you can try pouring a good bit of drain cleaner down the vent pipe on the roof, followed by water. But because there may be several vent pipes sharing the same vent stack out the roof, the drain cleaner may not get to your blockage and may simply go down a different path. Good luck.

Sounds like you have an intermittently blocked vent pipe (the one that goes out through your roof). If there is gas pressure in the downstream sewer line and it can't get up through the vent, it could bubble up through your toilet or sinks. I would get up on the roof with a few jugs of powerful drain cleaner and dump them into your vents. You might also run a few dozen gallons of water down those vents after the drain cleaner has had time to work.
Good luck!

The smell may be coming from the sink trap if there is a problem with the vent pipe (that's in the wall from the sewer line to the roof). Do you ever hear gurgling in the sink drain when you flush? When you have the smell again, stick your head in the sink and see if that's where it's coming from. If you have a floor drain, the smell may be coming from there. In either case, a bit of water added to the drain will fill the trap and stop the smell. Please vote if you found this helpful. Good luck, Al K

Be sure to keep all water traps [in the bathrooms, sinks] thruout the house full of water, if not then you will get a sewer smell coming into the house in the form of an explosive gas...Methane
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You have a trap missing or a vent somewhere it shouldn't be. Your toilet could be leaking gas at the wax ring. If you just changed it, take it off, put on another wax ring, and squish it back down. Don't caulk it, grout it. If it is something else you just replaced, check the back of the sink, is the trap in place? Is there a auto vent somewhere under there? In the wall? How about the shower? Is it new? Does it have a trap on it? Are you hooked into the sewer or do you have a septic tank? I would need all that to know exactly what is happening.

check under sink for a clogged or a bad trap in drain. it is hard to believe that the smell is coming from faucet.

All plumbing drains whether under a sink or the stand pipe drain, for a washer, are required by LAW to have a trap to prevent the sewer gases from entering a home.

Sewer gases are dangerous in many ways, not the least of which is the terrible smell. Sewer gas can build up and if allowed to accumulate near an appliance that operates on gas (LP or natural) can combust and cause a fire and/or an explosion.

Yes, if you can do the installation youself, do it ASAP, or contact a licensed plumber and have installed a proper drain trap for the sink and also make sure the drain that the washer is draining into, also has a trap in it.

This will have a profound impact on the smell and will help alleviate foul odors from your sewer lines.

Hope you found this Very Helpful and best regards!

Fowl smells related to plumbing can have several causes. Here's a few potential issues that you can check. If none of them solve the problem you may need to call a plumber.

1) Look at your pedestal sink drain connection. Is there an an elbow connecting to your drain or a P Trap? A p trap is a pipe shaped like the letter "p" (hence the name) and it prevents sewer gas from rising into the bathroom. **sometimes an apprentice plumber puts in a pedestal without a p trap because they are fairly difficult to install, and ALL fixtures need P traps. If there is no P trap, then you need to put one in. It will be a tight space, but you may be able to do it yourself.

2) Do you have a floor drain? If so, your sink will need a trap primer at the drain. Or you can pour water into the drain from time to time before it evaporates from the trap

3) If the smell is more of a sulfur type smell and it appears from running water in other places in the house, then it could also be due the type of tank you have if you are on well water

My offhand guess is that number 1 is your issue.

Without further info, those are some of my best solutions so far, but if none of these are potential solutions, then make the following tests

1) close the door to the bathroom and leave it for an hour or two. Return to the room. Do you smell sewer smell? Is it in the entire room or more concentrated in a certain area? If you don't have a floor drain and its everywhere, there could be a missing P trap from a fixture, a lose toilet flange, a cracked drain pipe
2) without running water, smell your drain. Does it have a sewer smell? Then the P trap either is not present or you need to clean the drain with a drain cleaner due to a list of reasons
3) run water. does the sewer smell increase or does one suddenly appear. Is the smell more a different odor than sewer. See if it is the water itself. If so, check other places. If they do not have the smell then you may have recently installed your sink and there is some smell related to the new valve. Then you would need to use it some more until it disappears.

Check the top list, though because I really think you're just missing a P trap

Sewer breaks below the slab, an open pipe somewhere, some issue with the water supply, are among some other issues but that depends on the test