bad smell in basement toilet

[jakea42]

Hi, we've had a bad smell in our toilet in the basement which started a few weeks ago - we keep using bleach to sustain it but its not long term solution and only helps for a few hours. Does anyone have any ideas? it is a toilet smell, not sewage smell. The tank and shut off valve are behind the wall, i cannot access it

 

[Sonic70]

Is it the bowl or the seat?

 

[just pumps]

Being in a basement is the waste pumped up and away?

 

[just pumps]

Do you have cats or dogs?

 

[Madrab]

If the toilet is squeaky clean, don't forget under the rim, then behind the toilet wall needs to be looked at, only way to check that is, I'm afraid, in through the wall.

 

[jakea42]

We have a dog but she doesnt go in there. good question re whether pumped up, i will check this. The smell is coming from the bowl, when we close the lid the smell is a little better. thank you for all the tips already

 

[conny]

If it's below pavement level, then there's a good chance it's pumped up to the level of the outside drainage.
Even if it is pumping up to clear away it may be breaching a water trap seal and allowing the odours to return.
How is the level of water in the pan after flushing? Is there a slight gap between the water surface and the top of the exit hole? Even the slightest gap will allow 'fumes' to re-enter.