I NEED HELP! There is a sour smell eminating from my kitchen drains as well as the master bath shower drain, but no other drains. I have been doing some google searching so first of all let me point out that I do not have a garbage disposal. The smell is not a sulfur or rotten egg smell but is exactly like the smell of boiled eggs. I have tried the baking soda/vinegar remedy, as well as pouring a bleach/water mixture down them. Nothing has worked. Also, I am on city water and have a septic tank, not city sewage, and as I have said, the smell only comes from the two areas mentioned above, not all drains. Any ideas as to what might be causing the smell and how to get rid of it would be GREATLY appreciated. Thanks.