Most homeowners don't think about the sump pit until the pump kicks on during a storm. But that damp hole in the basement floor can quietly become a home for flies, crickets and other pests. If you've noticed small flies near the pit, insects crawling around it or a musty smell in the basement of your East Orange home, you probably have questions. Below are straight answers to common questions about pests in sump pits. If small flies are the main issue, our drain fly control service focuses on finding and removing their breeding sites.
Why Do Pests Like Sump Pits?
A sump pit collects groundwater from around the foundation so the pump can push it away from the house. Even when the pump is working properly, there's usually some standing water in the bottom of the pit. Over time, that water picks up soil, leaves, slime and organic debris. The pit is dark, humid and protected, and the basement around it tends to be damp.
That combination of water, organic matter and shelter is exactly what many moisture-loving pests need to feed, breed and hide.
What Kinds Of Pests Show Up Around Sump Pits?
- Drain flies. Small, fuzzy, moth-like flies. Their larvae feed on the slimy film in the pit and on the pump.
- Fungus gnats. Tiny dark flies that breed in damp organic debris.
- Mosquitoes. They can lay eggs in standing water in an uncovered pit.
- Springtails. Tiny jumping insects that gather in wet spots around the pit and on basement floors.
- Camel crickets. Humpbacked, long-legged crickets that love dark, damp basements.
- Centipedes and millipedes. Drawn to humidity and to the small insects living nearby.
- Cockroaches. American and oriental cockroaches favor damp basements and drains.
- Mice. Occasionally drawn by water, especially if there are gaps near the pit or discharge line.
If camel crickets are your main visitor, our post on camel crickets in the basement explains why they gather there.
How Can I Tell If The Pit Is The Source?
- Look inside with a flashlight. Check for slime, debris, larvae and insects on the walls or water surface.
- Check the lid. Gaps around the lid, the pipe and the cord let insects in and out.
- Use sticky cards. Place a sticky insect trap near the pit for a few days. A lot of small flies there point to the pit.
- Tape test. Lay clear tape over part of the lid opening overnight to see what's coming out.
- Follow the smell. A sour or sewer-like odor near the pit usually means organic buildup.
Are Pests In The Sump Pit A Problem?
Most sump pit pests are nuisances rather than dangers, but they still matter. Flies that breed in the pit wander into the rest of the house. Cockroaches and mice spread germs on surfaces and stored items. The pests themselves are also a sign of excess moisture, which can lead to mold, damaged storage and more pests over time. A pit full of debris can also interfere with the pump, which is the last thing you want during a heavy rain.
How Do I Keep Pests Out Of My Sump Pit?
- Use a tight-fitting lid. A solid, sealed sump cover keeps insects from breeding inside and cuts down on humidity.
- Seal around pipes and cords. Close gaps where the discharge pipe and power cord pass through the lid.
- Clean the pit. With the pump unplugged, scoop out debris and scrub slime off the walls and pump housing.
- Keep the area dry. Run a dehumidifier and fix leaks, cracks and poor grading that send extra water to the pit.
- Clear clutter. Move boxes and stored items away from the pit so pests have fewer places to hide.
- Check the discharge line. Make sure the outside end isn't clogged with debris. Ask a plumber about guards that don't restrict water flow.
- Seal basement entry points. Close gaps in the foundation, around windows and under doors.
Always unplug the pump before reaching into the pit, and plug it back in when you're done. Never leave the pump off during wet weather.
What If My Pit Has A Radon System Or Special Lid?
Some sump pits are part of a radon mitigation system and have a sealed lid by design. Don't remove or break that seal yourself. Contact the company that installed the system before opening it or making changes.
When Should I Call A Professional?
If flies keep coming back after cleaning, or you're seeing cockroaches, centipedes or mice in the basement, it's time for an inspection. Our NJ DEP-licensed technicians inspect the pit, drains and the rest of the basement, identify the pests and their breeding sites and recommend a targeted plan. We use Integrated Pest Management and EPA-registered, eco-safe products, and our work is backed by the EcoGuard Guarantee.
A sump pit is supposed to keep your basement dry, not feed a pest population. A sealed lid, a clean pit and a drier basement go a long way toward keeping your East Orange home comfortable.