Silver Bullet Pest ControlA big, dark bug ran across the basement floor or crawled out of the tub drain? In North Jersey homes, a "water bug" is almost always a large cockroach that lives in drains and damp spaces. Here's how to get rid of water bugs step by step, what actually works, and when it's time to call a pro.
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Not sure what you've got? Text a photo to 973-510-2585 and we'll tell you what it is.
To get rid of water bugs, dry out the damp areas they live in, keep drains covered and flushed, seal gaps around pipes, doors and the foundation, and use roach bait in the spots where you see them. Most "water bugs" in New Jersey homes are oriental or American cockroaches, so roach methods work — and if they keep showing up after a few weeks, a licensed exterminator can find the drain or entry point they're coming from. Call or text 973-510-2585 for a free quote.
"Water bug" is a nickname, not one species. In a New Jersey house it usually means one of these:
| Oriental cockroach | American cockroach | True water bug (giant water bug) | |
|---|---|---|---|
| Looks like | About an inch, shiny black or very dark brown, short wings | About 1.5 inches or more, reddish brown, long wings | Flat, brown, oval, up to a couple of inches, front legs like pincers |
| Where you see it | Basement floor, floor drains, laundry room, around the boiler | Basements, boiler rooms, drains; common in apartment buildings | Ponds, pools and lights outside at night |
| Comes from | Sewers, drains, crawl spaces and damp soil outside | Sewer lines and drains | Water — it rarely comes inside and doesn't live there |
| How to deal with it | Moisture, drains, sealing, bait | Drains, sealing, bait | Turn off porch lights; no house treatment needed |
If the bug was small, tan and in the kitchen, that's a German cockroach, not a water bug — and it needs a different plan. Compare them on our water bug vs. cockroach page.
Oriental and American cockroaches need water more than food. They live in sewers, storm drains, damp crawl spaces and the soil under mulch, and they come inside looking for moisture or when their outdoor spots flood or dry out.
More on this in why water bugs are in your house.
Note where and when you see them — floor drain, tub, laundry, boiler room. That's usually close to where they're getting in.
Pour water into floor drains and unused sinks weekly so the trap stays full. Use drain covers or screens on floor drains, and keep basement drain plugs in when not needed.
Fix dripping pipes, run a dehumidifier in the basement, move downspouts away from the foundation and don't leave wet laundry or mops sitting.
Caulk around pipes, put sweeps on basement and garage doors, and fill cracks in the foundation and around basement windows.
Get cardboard off the basement floor, store things in plastic bins on shelves, and pull mulch and leaves back from the foundation.
Roach gel bait or bait stations placed along walls, near drains and in corners work better than spraying. Don't spray over bait — it makes them avoid it.
Give it two to three weeks. If you still see them often, something is feeding the problem that's hard to find yourself — like a broken pipe, an open sewer cleanout or a gap behind a wall.
They can't stay long where it's dry. A dehumidifier and fixed leaks do more than any spray.
Gel bait is eaten and carried back to hiding spots. It's also easier to keep away from kids and pets than a spray.
A light dusting in dry cracks and voids can help, but it stops working when it gets wet, and piles of it are avoided. See boric acid for roaches.
Foggers don't reach drains or wall voids, push roaches deeper into the house and leave residue on surfaces.
Bleach down the drain, vinegar, essential oils and plug-in sound devices don't solve the problem — they don't fix the open drain or the damp spot the roaches are using. Wondering about quick fixes? Read what kills roaches instantly.
A water bug or two after a storm is common. Seeing them every week, or during the day, means they're living inside — usually near a drain or damp spot.
When they move upstairs, they're often using pipe chases and drains. In apartment buildings they can travel between units through shared plumbing.
Droppings, egg cases and a musty smell near a damp area are signs of a population, not a visitor. Finding and sealing the entry is the long-term fix.
Doing the steps above solves a lot of water bug problems. It's time to call a licensed exterminator when:
What a professional visit looks like: a Silver Bullet Pest Control technician checks your drains, basement, crawl space, boiler and laundry area, pipe openings and the outside foundation to find where they're coming in. We place gel bait and an insect growth regulator in the cracks and voids they use, treat around the outside where needed, show you what to seal and come back to follow up. Roach treatment carries a 90-day warranty.
Seeing them right now? Call or text 973-510-2585. Same-day service is often available. We serve homes and businesses in Bergen, Passaic, Essex and Hudson counties from our base in Garfield.
For more prevention tips that cover all kinds of roaches, see how to prevent cockroaches and our water bug prevention tips.
Tell us where you're seeing them and how often, and send a photo if you can. We'll tell you what they are and give you a free quote.
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In most New Jersey homes, yes. What people call water bugs are usually oriental or American cockroaches that live in drains and damp places. True water bugs are aquatic insects that live in ponds and rarely come inside.
A direct hit with a roach spray kills the one you see, but it doesn't stop the rest. For lasting results, use roach bait where they travel, keep drains full and covered, and dry out damp areas.
Heavy rain floods the drains, sewers and soil they live in, so they move up and out looking for a dry, safe place, often through floor drains and gaps at the foundation. Keeping drains covered and gaps sealed helps.
Oriental and American cockroaches very rarely bite people. True giant water bugs can give a painful bite if handled, but they live outdoors in water. See our page on whether water bugs bite for more.
Yes. When a drain trap dries out, there's no water to block the pipe, and roaches can climb up from the sewer line. Running water in unused drains weekly and using drain covers stops this.
Not really. Bleach may kill a few in the pipe at that moment, but it doesn't keep new ones from coming up or fix the dry trap or damp spot they're using. Keeping traps full and covered works better.
One after a big storm usually isn't. Seeing them every week, during the day, upstairs, or finding droppings and egg cases means they're living inside and you should treat the problem.
With drains covered, moisture fixed and bait in place, most homes see a big drop within two to three weeks. If they come from a hidden plumbing problem, it can take longer until that source is found and fixed.
It depends on how many there are, where they're coming from, the size of the home or building, and how many follow-ups are needed. We give a free quote after seeing the property.
Mantenga los desagües con agua y tapados, seque el sótano, selle grietas y use cebo en gel donde las vea. Si siguen apareciendo, llámenos o mande un texto al 973-510-2585. Hablamos español.
We treat water bugs and roaches across Bergen, Passaic, Essex and Hudson counties.
Updated November 2026 by the Silver Bullet Pest Control team, Garfield, NJ • NJ License 90568B
