To get rid of a sewer smell in your crawl space, you’ll have to find the source of the problem. If it has to do with your sewer lines, then repairing the line will help. You may need to make other repairs, like fixing your sump pump or encapsulating your crawl space to reduce moisture. After you make the repair, depending on the issue, you may still need to clean out your crawl space to get rid of the stink.
Ejector pumps can only push sewage 750 feet or less. That’s because their purpose is to move waste from your home to your sewer line—which is a relatively short distance. Grinder pumps can transport sewage further, but they manage lower volumes of waste than ejector pumps (and they don’t work with septic systems).
If you’ll be digging up your floor to get access to your pipes when putting in a sewer backflow preventer, this would also be a good time to take care of any other plumbing issues or renovations. For example, you could install additional pipes for a basement bathroom. Since the floor will be sealed over with concrete when you’re done, now’s a good time to take care of those bigger tasks.
Thankfully, it’s pretty rare to find a rat in your toilet. It’s more likely in larger cities with big sewer systems that can be feeding grounds for rats, but even then, you still shouldn’t fret.
“I wouldn’t worry too much about rats coming up through the sewers,” Bradshaw says. “I’d say only one out of a thousand rodent customers we get actually have this problem. And of the 20 or some customers that have had this happen, they’ve all only had just one rat come up this way.”
It is generally safe to stay in a house that smells like sewage for a short time, but you should get the problem fixed as soon as possible. While the level of sewer gas is usually low enough to only cause minor symptoms, prolonged inhalation can lead to headaches, nausea, or respiratory irritation. High levels of gas exposure can be more dangerous, and high concentrations of methane—a component of sewer gas—can pose an explosion risk in enclosed spaces. If you smell sewer gas in your home, ventilate the area and call a professional to locate, assess, and fix the problem, as it will not go away on its own.
The Big Sandy, MT homeowners’ guide to sewer cleaning services
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