Quick answer
The American cockroach (Periplaneta americana) is a large, reddish-brown cockroach, about 1 1/2 to 2 inches long, with a pale yellow band behind its head, that lives mainly in sewers, drains, basements and warm, damp outdoor spots and wanders indoors.
It is the biggest of the common house roaches. In the South it is often called a palmetto bug or water bug, and it usually signals a moisture or drain problem.
Quick facts
The key facts about American Cockroach, with sources:
Key takeaways
- American cockroaches are the big, reddish-brown roaches, up to 2 inches, often seen near drains and basements.
- They mostly live outside your living space, in sewers, storm drains, mulch and palm trees, and wander in.
- They grow slowly, taking well over a year to reach adulthood, unlike the fast German roach.
- Sealing gaps, fixing moisture and closing drains often matters more than spraying.
- A big roach indoors is a clue to a pathway, not always a breeding population.
What an American cockroach is
The American cockroach is the roach that makes people jump. Adults are 1 1/2 to 2 inches long, shiny and reddish-brown, with a pale band around the shield behind the head 3. Both sexes have full wings, and on males they reach 4 to 8 mm past the tip of the body 1.
Despite the name, it is not native, and UF/IFAS says the species was carried to North America from Africa as early as 1625 1. Today it is second only to the German cockroach in how common it is, and a single sewer manhole can hold more than 5,000 1.
Outdoors it lives in wood piles, rotting trees, palm trees and sewer systems 3. Indoors it prefers dark, warm, damp places such as basements, crawl spaces, floor drains and laundry hampers 2. Freshly molted roaches look pale or white; they are not albino 3.
Palmetto bug, water bug, sewer roach
These are nicknames, not separate species. “Palmetto bug” is a common Southern name for big outdoor roaches like this one, while Purdue notes the oriental cockroach is also called a “water bug” 5. Check size and color to know which you have.
How the American cockroach lives and grows
The American roach grows slowly and lives long compared with the German roach, and each stage below shows why numbers build gradually.
- Egg case: The female carries a bean-shaped case about 3/8 inch long for up to about 6 days, then glues it to a sheltered surface 4. Penn State notes many drop it within a day of forming it 2.
- Incubation: Eggs take about 6 to 8 weeks to hatch at room temperature 1.
- Nymphs: Grayish-brown young molt 10 to 13 times over 470 to 600 days, depending on heat 3.
- Adults: A female can live up to about 15 months under ideal conditions and drop a case roughly every week at peak 2.
- Feeding: Mostly at night, on almost anything: grease, starches, sweets, even leather and wallpaper paste 3.
- Egg caseAbout 14–16 eggs; carried a day to about 6 days
- HatchAbout 6–8 weeks later
- Nymph10–13 molts over 470–600 days
- AdultFemale lives up to about 15 months
- Back to step 1
Slow growth means American roach numbers climb more slowly indoors than German roach numbers do. Source: [4] [1] [3] [2]
Large roaches people mistake for the American cockroach
| Roach | Size and color | Where it lives |
|---|---|---|
| American | 1 1/2–2 in, reddish-brown, pale band behind head 3 | Sewers, drains, steam tunnels, palms 32 |
| Oriental | About 1–1 1/4 in, shiny black or very dark brown 54 | Cool, damp drains, basements, meter boxes 4 |
| Smokybrown | About 1 1/2 in, uniform dark brown 4 | Attics, upper floors, outdoor plantings 4 |
| Turkestan | Female about 1 in 4 | Meter boxes, block walls, sewers; spreading in California 4 |
| Cuban | Pale green 3 | Outdoors; occasional in the Houston area 3 |
Worked example: tracing a basement roach to its source
Here is an example of how a technician reads clues in a home where large roaches keep showing up in a basement laundry room, following the extension guidance cited.
| Clue found | What it suggests | Fix |
|---|---|---|
| Large reddish-brown roaches near the floor drain | American roaches entering from the drain line 2 | Drain cover or screen; keep the trap full of water |
| Gaps where pipes pass through the wall | An entry path from a crawl space or outside 3 | Seal around pipes and wires 3 |
| Damp corner behind the washer | Moisture that keeps them alive; they need water within about a month 2 | Fix the leak, dry the area |
| Mulch piled against the foundation outside | Outdoor harborage close to the house 4 | Pull mulch back; a 6–12 inch gravel strip helps 4 |
| Sticky trap catch drops over a week | Entry points are closing | Keep monitoring; bait only where they still appear 2 |
One week of trapping usually gives enough information, Penn State says 2. The fix here was mostly sealing and drying, not spraying.
Where you will see them, and on what paperwork
- Around drains: Floor drains, tubs and laundry sinks 2.
- Basements and crawl spaces: Dark, warm, moist spots 2.
- Commercial kitchens: Restaurant basements, bakeries and grocery stores 2; nearby homes can be affected 5.
- Outdoors at night: On patios and walls, especially in warm, humid weather.
- On an inspection report: “Periplaneta americana” or “peridomestic cockroach,” with notes on entry points and moisture. A real estate pest report may list it; see pest inspection.
The upside: slower and easier to block
The good news is that the American roach is much easier to manage than the German roach, because it breeds slowly and mostly lives outside the living space. Blocking its path is often enough to stop sightings.
Nature also helps: UF/IFAS notes that small parasitic wasps lay their eggs in American roach egg cases, and broad spraying can kill them 1. That is one more reason to start with exclusion and targeted baits.
- 2–3 monthsAdult survival without foodPenn State
- About 1 monthAdult survival without waterPenn State
Source: [2]
Limits of control
- You cannot remove the sewer population; you can only keep it out of the house 1.
- Penn State says residual sprays and aerosol foggers are of little value and can scatter roaches 2.
- Older buildings with many pipe and wire gaps can need repeated sealing.
- In warm areas, outdoor numbers stay high, so occasional summer sightings may continue.
What drives the cost
We do not publish prices without enough dated local quotes. The cost of American roach work depends mainly on how much sealing is needed, whether drains or crawl spaces must be addressed, the size of the outdoor harborage and whether the plan includes recurring perimeter visits.
A one-time exclusion job is often cheaper over time than repeated spraying, because it removes the reason roaches get in. Compare plans on the cost guide and with the recurring plan tool.
Adults can live more than a year, so a few may keep appearing for a while after entry points are closed 2.
How professional control works
The order matters: find the route, then block it, then treat what remains.
- Inspect drains, basements, crawl spaces, pipe gaps and the outside foundation 23.
- Trap for about a week to confirm the species and hot spots 2.
- Seal cracks, pipe and wire holes, and gaps under doors 34.
- Reduce moisture and harborage: fix leaks, move mulch and woodpiles away 4.
- Bait where roaches still hide, using products labeled for the site 2.
- Follow up with trap checks.
The approach follows integrated pest management. Ask for the product labels for anything applied.
What an owner can keep up
- Run water in rarely used drains so the trap stays filled.
- Keep crawl spaces and basements dry; see moisture control.
- Keep weather stripping and door sweeps in good shape 4.
- Store firewood and mulch away from the house walls 4.
- Check sticky traps by drains every month or two.
- Drain traps full
- Pipe gaps sealed
- Door sweeps intact
- Mulch pulled back
- No standing water in the basement
Health risks and when to call
Because they move between sewers and kitchens, American roaches can carry germs onto food.
UC IPM says they may spread Salmonella and Shigella 4, and UF/IFAS reports at least 22 kinds of disease-causing microbes found on field-caught roaches 1.
Texas A&M notes they have not been shown to directly cause disease, but they foul food and utensils with droppings and saliva 3.
Call a professional if you see them often indoors, find nymphs or egg cases inside (a sign of breeding), or run a food business.
Product safety
Follow every label direction and keep baits away from children and pets. For a swallowed product, call Poison Help at 1-800-222-1222; for trouble breathing, call 911 7.
Rules that apply
Insecticides for roaches must be registered by the U.S. EPA under FIFRA, and the label is legally binding. That includes where a product may go: indoors, outdoors, in cracks or in drains. Learn more on our pesticide safety page.
EPA advises against relying on total release foggers in small spaces and warns that their propellant is flammable 7. Food businesses also face local health code rules on pest control. Companies applying pesticides for pay must be licensed by the state; see the licensing guide.
American cockroach vs German cockroach
| Trait | American | German |
|---|---|---|
| Size | 1 1/2–2 in 3 | About 1/2 in 4 |
| Where it breeds | Sewers, drains, outdoors 4 | Indoors, kitchens and baths 4 |
| Egg to adult | 470–600 days 3 | 70–100 days 6 |
| Eggs per case | About 14–16 2 | About 30 4 |
| Main fix | Seal, dry, block drains | Sanitation, baits, monitoring |
For the small indoor species, see German cockroach. For all species, see cockroach.
Myths about American cockroaches
- Myth A palmetto bug is a different insect.
- Reality “Palmetto bug” is a regional nickname for large roaches such as this species.
- Myth A white roach is an albino.
- Reality Texas A&M says pale roaches have just molted 3.
- Myth One big roach means the house is infested.
- Reality Large roaches often wander in from drains or outdoors without breeding inside 2.
How climate changes where you find them
Climate shapes this roach’s range. In warm, humid southern areas it lives outdoors in palm trees, wood piles and sewers 3, and UC IPM says it favors warm, humid spots above 82°F 4.
In northern areas, Penn State says it is mostly tied to steam heat tunnels and large institutional buildings, and adults rarely fly 2. Check when roaches peak in your area with the seasonal calendar.
When it matters to you, and what to do next
If you see one large roach in summer, check drains and door gaps and set a trap. If you see them every week, find nymphs, or run a restaurant, call a licensed company and ask for an exclusion-first plan.
Our cockroach control service page explains what full treatment looks like.
Quick decision guide
An occasional big roach calls for sealing and drying. Weekly sightings or nymphs indoors call for a licensed pro. A food business needs a professional program, which most health inspectors expect.
Questions about American Cockroach
How big is an American cockroach?
An adult American cockroach is about 1 1/2 to 2 inches long, the largest of the common house roaches.
Texas A&M lists 1 1/2 to 2 inches and Penn State about 1 1/2 inches.
Males look a bit longer because their wings stretch past the tip of the body, while nymphs are smaller, grayish-brown and wingless.
Is a palmetto bug the same as an American cockroach?
Often, yes, because “palmetto bug” is a Southern nickname for large outdoor roaches, and the American cockroach is the one most often meant. Some people use the name for the smokybrown cockroach too. The name does not change the biology: these roaches mostly live outside and wander in.
Why do I see big cockroaches in my house?
Big cockroaches usually get in from drains, sewers, crawl spaces or gaps around pipes and doors, drawn by warmth and moisture. Texas A&M says they enter through cracks around loose doors and windows and where pipes or wires pass through walls. Sealing those paths and drying damp spots is the main fix.
Can American cockroaches fly?
American cockroaches can glide but do not sustain flight, according to Texas A&M. In warm, humid weather they may glide from a wall or tree. Penn State notes adults rarely fly in northern areas. Their wings are fully developed, which helps tell them from the oriental cockroach, whose females have only small wing pads.
How long do American cockroaches live?
American cockroaches live a long time for insects, and Texas A&M says nymphs take 470 to 600 days to become adults. Penn State says adult females can live up to about 15 months under ideal conditions. That long life means a few adults may keep appearing for a while even after entry points are sealed.
Do American cockroaches come up through drains?
Yes, they often do, because they live in sewers and storm drains, and Penn State lists floor drains and bathtubs among their indoor hot spots. A dry drain trap gives them an open path. Running water in unused drains, fitting drain covers and fixing broken lines help keep them out.
Are American cockroaches dangerous?
They are a hygiene risk rather than a direct danger. UC IPM says they may spread Salmonella and Shigella, and UF/IFAS reports many microbes found on field-caught roaches. Texas A&M notes they have not been shown to directly cause disease but contaminate food and utensils, although they do not usually bite people.
How do I keep American cockroaches out?
Seal entry points, remove moisture and move harborage away from the house.
Caulk around pipes and wires, add door sweeps, keep drain traps filled, fix leaks and pull mulch and woodpiles back from the foundation.
UC IPM suggests a 6 to 12 inch gravel strip around the building to reduce moisture, and baits help with roaches that remain.
What is the difference between American and oriental cockroaches?
American cockroaches are larger and reddish-brown with a pale band behind the head. Oriental cockroaches are about an inch long, shiny black or very dark brown, and prefer cool, damp places. Oriental females have only small wing pads, and males’ wings cover about three-quarters of the body, per Texas A&M.
Sources
- University of Florida IFAS, American Cockroach, Periplaneta americana (EENY141/IN298), retrieved .
- Penn State Extension, American Cockroaches, retrieved .
- Texas A&M AgriLife, Field Guide to Common Texas Insects: American Cockroach, retrieved .
- UC Statewide IPM Program, Pest Notes: Cockroaches (Publication 7467), retrieved .
- Purdue Extension Entomology, Cockroaches (E-23), retrieved .
- NC State Extension, Biology and Behavior of the German Cockroach, retrieved .
- U.S. EPA, Safety Precautions for Total Release Foggers, retrieved .
Expert review
Written by the HyrePest Research team. Not yet reviewed by an outside expert. We say so rather than imply a review that has not happened; see our editorial policy.
How the numbers were checked: Identification, range and life-cycle figures follow UF/IFAS, Penn State and Texas A&M AgriLife, attributed where they differ (egg-to-adult time, adult life). Health statements give both UC IPM and Texas A&M wording. Fogger guidance is from the EPA. No prices, doses or application rates are given.
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