JOIN THE MVP PROGRAM for as little as **$9/month** Ask Us How! Read More

Skip navigation

Serving Orange County

- SINCE 1981 -

Serving Orange County

- SINCE 1981 -


Hours: Monday-Friday 7:30-5:30PM
Saturday: 8:00-1:00PM


Saddleback Plumbing Heating & Air Blog

The Cause of Bad Odors from Drains

A plumbing system in a home that generates foul, sewer-like odors is something that you want corrected right away. There are a number of reasons that drains can start to emit bad smells, from simple problems that you can fix yourself in a few minutes, to extensive troubles with the sewer system that require major repair work from professionals. Whatever the cause and whatever the remedy, take care of those smelly drains right away.

Here at Saddleback Plumbing, we’ve provided comprehensive plumbing repair in Lake Forest, CA and the rest of Orange County since 1981. We handle drain cleaning and sewer repairs that will take care of bad smelling drains or any other trouble. Make us your first call for all your plumbing needs.

Why Drains Can Develop Bad Odors

  • Dry p-trap: This is the simplest explanation, and also one that you can take care of on your own. The p-trap in a drain is the curved section of drainpipe directly beneath the sink. This shape is designed to trap water to serve as a plug against sewer gas that rises up from the wastewater system. If the sink is not used for a long period, the water in the p-trap will evaporate and allow sewer gas to escape out of the drain. If you notice the sewer odors coming from a sink in a guest room or some other sink that doesn’t receive much use, a dry p-trap is likely the source of the problem. Run water through the drain for a few minutes to restore the water plug, and that should take care of it.
  • Blocked drain vents: Your plumbing has vent pipes in the wastewater system to prevent a build-up of pressure from sewer gas. Gases from the plumbing rise up through these vent pipes and leave through vent openings on the roof. If these openings become blocked (animal nests, debris from bad weather, construction errors) it will force the sewer gas up through the p-trap and push it through the water. If you hear a gurgling sound from the bad-smelling drains, it probably means the plumbing vents are blocked. Don’t go to the roof to try to fix this: stay safe and call for professionals.
  • Sewer line damage: This is the most serious scenario. If you notice multiple drains in your home are emitting the bad smells, it may mean that the sewer line that carries the collected wastewater from your home to the municipal sewer system is damaged or blocked. This needs immediate attention, since it can lead to sewage flooding into your home’s foundations and up onto your yard. The repairs required are extensive and need the most skilled plumbers you can find to perform.

If you can’t solve the bad drain odors on your own with a little water poured down the drain pipes, call Saddleback Plumbing right away. One of our skilled plumbers will help you with the necessary plumbing repair in Lake Forest, CA that will eliminate those odors and protect your home’s plumbing.

Comments are closed.

Let's talk about your project.