Persistent plumbing odors usually have a cause inside the system.
Bad Odor FAQs
Why does my drain smell bad?
Common causes include buildup inside the drain, a dry trap, venting trouble, sewer gas, or a septic issue.
Are sewer smells dangerous?
They can be. Persistent sewer odors should be investigated because they may indicate sewer gas entering the home.
Can cleaning the drain fix the odor?
Sometimes. If the smell comes from buildup in a single drain, cleaning may help. If the cause is venting, sewer, or septic related, it needs a different repair.
Why does the odor come and go?
Odors can change with water use, weather, trap evaporation, venting conditions, or movement in the sewer or septic system.
What if only one sink smells bad?
One smelly fixture may point to local drain buildup, a trap issue, or bacteria in that fixture line.
What if the whole house smells like sewer gas?
A whole-home sewer odor can point to venting, main sewer, septic, or trap problems and should be checked quickly.
Should I cover the smell with air freshener?
No. Covering the smell does not solve the cause. Persistent plumbing odors should be diagnosed.

