American Cockroaches in Collin County, TX | Identification and Control
The American cockroach (Periplaneta americana), also called the palmetto bug, water bug or sewer roach, is the largest cockroach Collin County homeowners find. Unlike the German cockroach, which lives and breeds indoors, it lives outside and in the sewer, and comes in through drains and foundation entry points when heat and heavy rain push it. That is why the fix starts at the drain, not the kitchen. The University of Florida Institute of Food and Agricultural Sciences Extension reports that at least 22 species of disease-causing bacteria, viruses, fungi and protozoans, plus five species of parasitic worms, have been isolated from American cockroaches collected in the field.
Found a big roach in your garage in Collin County? Our office sits where McKinney, Plano, Frisco and Allen meet, 5 to 10 minutes from most homes in those four cities. Send us a photo or call, and we will tell you which cockroach it is.
American Cockroach
American cockroach reference photos from Oklahoma State University Extension show the species at several life stages if you want to compare yours.
Risk Assessment
Choose a row for the full detail- Color
- Reddish-brown, with a pale yellow ring outlining the shield behind the head
- Threat level
- Moderate
- Wings
- Full wings on both sexes, reaching just past the tip of the abdomen
- Peak season
- August through October in Collin County
- Eggs
- 14 to 16 per egg case, 10 to 15 cases in a female’s lifetime
- Young to adult
- 470 to 600 days, then about a year as an adult
- Body length
- About 1.5 in on average, the largest cockroach in our service area
What an American Cockroach Looks Like
Adult American cockroaches measure 1.5 inches long on average, according to University of Florida Institute of Food and Agricultural Sciences Extension. They are reddish-brown, darker and richer than a German cockroach. The fastest confirmation is the yellow ring, a pale tan to yellow border around the shield-like plate behind the head (the pronotum), shaped like an open horseshoe or a partial figure eight. A large reddish roach with that mark is an American cockroach.
Both males and females have full wings that reach just past the tip of the abdomen. The young are wingless and grayish-brown, and pass through 10 to 13 growth stages before adulthood. The most common first mistake is calling a big roach in the garage a German cockroach. Size rules that out, since the American cockroach is about three times as long.
How to identify an American cockroach by the yellow ring behind its head, its reddish-brown wings and its long antennae
- Reddish-brown body about 1.5 inches long, the biggest cockroach in our service area by a wide margin
- Pale yellow ring or partial figure-eight pattern on the plate behind the head
- Full wings on both sexes, extending slightly past the abdomen
- Long antennae, often longer than the body itself
- Found in garages, utility rooms and near floor drains, not inside kitchen cabinets
Palmetto Bug, Water Bug and Other Names for the American Cockroach
A palmetto bug is an American cockroach. Palmetto bug, water bug and sewer roach each describe a real habit of the same insect, and none of them changes how it is treated. The one name that misleads is water bug, because the Oriental cockroach goes by it too. When someone calls about a water bug, we ask about the color first. Reddish-brown with a yellow mark behind the head is an American cockroach. Dark brown to black with no yellow is an Oriental cockroach, and that changes the treatment plan.
Where Are American Cockroaches Found?
American cockroaches are found in every part of Collin County. The Texas A&M Urban and Structural Entomology Program says it prefers humid places, under tree bark and leaf litter outdoors and in sewer systems, and Pest Me Off service records across the 14 cities we serve match it, with the American cockroach the dominant large cockroach in our calls.
iNaturalist field observations show sightings in every month of the year across the Dallas-Fort Worth area.
| Name | What it means |
|---|---|
| Palmetto bug | The usual name in the southeastern United States, where this species shelters in palmetto palm fronds. |
| Water bug | Named for its love of damp places and drains. The Oriental cockroach shares this name, so check the color. |
| Sewer roach | The most accurate name in Collin County, where the city sewer system is where most of them come from. |
| Periplaneta americana | The scientific name. Every name above means this one species. |
How to Tell American Cockroaches from Other Collin County Cockroaches
Large cockroaches bring in more alarmed calls than small ones, and more mistaken IDs. The table compares the American cockroach with the three cockroaches it is most often confused with in Collin County.
| Species | Size | Key Feature | Where Found |
|---|---|---|---|
|
American Cockroach
AKA: Palmetto Bug, Water Bug, Sewer Roach
Periplaneta americana
This species
|
About 1.5 in on average, the largest cockroach in our service area. Big enough that people who have never seen one often take it for a flying beetle or a giant water bug. | Reddish-brown body with a yellow ring outlining the plate behind the head. Both sexes have full wings and glide in warm weather. | Garages, utility rooms, floor drains, plumbing voids and the slab edge. Outdoors in mulch beds and around the foundation in the warm months. Comes in through floor drains and expansion joints, most after heavy rain and in extreme summer heat. |
German Cockroach
AKA: Croton Bug, Kitchen Cockroach
Blattella germanica
|
12 to 15 mm (about half an inch), roughly one third the length of an American cockroach. Light brown to tan with a darker rear section. | Two dark parallel stripes running lengthwise on the plate behind the head. Lives only indoors in heated buildings and is never found outdoors in Collin County. | Kitchens and bathrooms, behind refrigerators and dishwashers, under sinks, inside cabinet hinge pockets. Active year-round indoors. One found in a garage or near a drain points away from this species. |
Oriental Cockroach
AKA: Black Beetle, Water Bug, Shiny Black Roach
Blatta orientalis
|
22 to 27 mm (about 1 inch), roughly half the size of a large American cockroach. Dark brown to shiny black all over, often described as greasy-looking. | Neither sex can fly. Uniformly dark, almost beetle-like, with no yellow markings. Gives off a strong musty odor. | Garage floors, utility rooms, slab edges and floor drains, in cooler and damper spots than the American cockroach. Most common in newer homes in Celina and Prosper where utility pipe gaps were never sealed. |
Smoky Brown Cockroach
AKA: Tree Roach, Flying Cockroach
Periplaneta fuliginosa
|
25 to 40 mm, close to the American cockroach in size but uniformly dark mahogany brown with no yellow ring behind the head. | Comes in high, through attic vents and soffit gaps, not up from the sewer. Strongly drawn to outdoor lights at night. | Attics, porches, around exterior lights and entry doors after dark, near mature trees and mulched beds. Found in Plano, Allen and south McKinney where mature tree canopy sits close to homes. |
American Cockroach vs German Cockroach
The American Cockroach in Three Numbers
1.5 in
The University of Florida Institute of Food and Agricultural Sciences Extension puts the average adult American cockroach at 1.5 inches long, the largest cockroach Collin County homeowners find.
University of Florida Institute of Food and Agricultural Sciences Extension
14 to 16
Penn State Extension reports that each American cockroach egg case holds 14 to 16 eggs on average.
Penn State Extension
At least 22
The University of Florida Institute of Food and Agricultural Sciences Extension reports that at least 22 species of disease-causing bacteria, viruses, fungi and protozoans, plus five species of parasitic worms, have been isolated from American cockroaches collected in the field.
University of Florida Institute of Food and Agricultural Sciences Extension
Are American Cockroaches Dangerous?
Yes, in one way. They carry bacteria from sewers and rotting matter onto counters, cutting boards and utensils. The University of Florida Institute of Food and Agricultural Sciences Extension reports that at least 22 species of disease-causing bacteria, viruses, fungi and protozoans, plus five species of parasitic worms, have been isolated from American cockroaches collected in the field.
The window for that contamination in Collin County is late summer through fall, when the most of them push indoors.
American cockroach allergens can also trigger reactions in people already sensitized to them. That is less common than with German cockroaches, which live indoors at much higher numbers, so for most homes with a seasonal American cockroach problem the contamination matters more than the allergy.
Can American Cockroaches Fly?
Yes. Both sexes have full wings and can glide, though long flights are uncommon. Flight is most likely in hot, humid weather above 85°F, which in Collin County means July through September. Most flights are erratic and head away from people rather than at them.
In that heat they also come in through garage door thresholds and doors left open for a moment.
What to Throw Out After an American Cockroach Sighting
Open Food Where One Walked
If you see one on a counter, a cutting board or inside a pantry cabinet, throw out any open or loosely sealed food in that space. Treat anything in paper, open bags or soft packaging as contaminated. That includes pet food in open bowls or loose bags, which draws American cockroaches more reliably than any other food in Collin County homes.
Food in Sealed Containers
Sealed containers in the same cupboard are generally safe to keep. Moving pantry food and pet food into sealed containers is the simplest way to make the next sighting cost you nothing.
Why You Found an American Cockroach in Your House
An American cockroach in the house came in from outside or up from the sewer. One in the kitchen or garage is almost always a scout that found an open path, not proof of a colony breeding inside the way a German cockroach sighting would be. It has nothing to do with how clean the house is. A spotless home with a dry floor drain or a gap around the water pipe draws them just as well as a messy one.
The fix is the path it used. Find the dry drain, the loose sewer cleanout cap or the unsealed pipe gap between the outside and the room where you saw it, and close it before more use the same route.
Where American Cockroaches Come From in Collin County
The city sewer system is the biggest source. From the sewer main they climb drain pipes whenever a P-trap dries out. Floor drains in garages, utility rooms and mechanical rooms are the most exposed, because they can go months without water and the trap evaporates. Penn State Extension’s American cockroach research documents how much the species depends on high humidity, which is why the sewer stays a year-round home for them even through Collin County winters. Outdoors they gather in the damp ground along the foundation: mulch beds, leaf litter, wood piles against the house, dense foundation plantings, and loose or cracked sewer cleanout caps in the yard.
American Cockroach Presence Across Collin County
Plano and Carrollton have the highest steady American cockroach call volume, driven by older storm drain networks with more access points near home foundations. Allen and McKinney see heavy summer pressure in garages and utility rooms, peaking when August and September heat drives sewer populations upward. Craig Ranch and Stonebridge Ranch in McKinney both see outdoor pressure from large populations in the surrounding landscape and mulch beds through the warm months.
Newer construction in Celina, Prosper and Anna has a related problem: gaps around utility pipes where they pass through the slab, left unsealed during construction. They are a less common route than drains, but they lead straight inside and often go unnoticed for one to two years after the build.
Outdoor populations press hardest on homes from late summer through fall, when heat and drought push them toward cooler, conditioned spaces. A summer of breeding has also left the outdoor population at its yearly high by then. Winter lowers activity without ending it, because the sewer stays warm all year and keeps sending them toward drain entry points.
Pest Me Off service call records across Collin County from 2023 to 2026 put the peak in 3 months, August through October, matching the species’ seasonal biology for this climate.
Why American Cockroaches Keep Coming Back After Treatment
How Pest Me Off Treats American Cockroaches
Our American cockroach treatment works on the outdoor source and the indoor entry path at the same time, in four steps.
Inspect and Map Entry Points
Confirm the species, then walk every possible way in: all floor drains (garage, utility room, laundry), the sewer cleanout caps in the yard, gaps around the main water line, gas line and electrical conduit into the garage, and door thresholds. Note which drains are at risk of drying out.
Outdoor Perimeter Barrier
Put bait around the whole foundation and into mulch beds within 10 feet of the house. Follow with a residual spray cockroaches cannot detect along the foundation, at weep holes and around every utility entry. Fix the condition of the sewer cleanout caps.
Drain and Indoor Treatment
Treat floor drains and sink drains with a drain product. Fit screened covers on floor drains in rooms that are rarely used. Place a larger-format gel bait along baseboards in the garage and utility areas, and treat cracks where the slab meets the wall.
Follow-Up at 30 Days
When our technician decides it is needed, we return around 30 days to measure how many are still getting in from the sewer. We reapply outdoor bait if seasonal pressure is still high and confirm the drains are holding. In the August to October peak, the outdoor barrier may need a second application at 60 days.
& Quick Fixes
How to Get Rid of American Cockroaches Yourself
Most of what works costs nothing. It comes down to closing the ways in and drying out the ground along the foundation, which cuts the pressure between professional visits.
Why Some DIY Responses Fail for American Cockroaches
American cockroaches are easier for a homeowner to handle than German cockroaches. The DIY attempts that fail make one of the three mistakes below, and each keeps a home on a call-every-summer cycle.
Spraying Only Indoors
The roaches in your garage or utility room arrived from outside. Spraying them kills the ones you found, and the outdoor population sends more through the same drain the next week.
Repellent Sprays at the Foundation
Most store perimeter sprays repel. Cockroaches detect the barrier and walk around it to an untreated gap, so the spray moves them from one side of the house to the other. Professional products are ones they walk through without noticing and carry back outside.
Treating Once With No Follow-Up
One outdoor treatment lowers the numbers at the foundation, but the sewer source stays. As the product breaks down over four to six weeks, faster in Texas summer heat, the pressure climbs back toward where it was.
Common American Cockroach Questions
What is the big reddish-brown roach I found in my garage?
Is a palmetto bug the same as a cockroach, and what about water bug and sewer roach?
Can American cockroaches fly, and will they fly at me?
I found one in my kitchen. Does that mean I have an infestation?
Why do American cockroaches come inside every summer in Collin County?
Do American cockroaches come from a dirty house?
How do American cockroaches get through floor drains if there is a P-trap?
What is the difference between American cockroach treatment and German cockroach treatment?
Are American cockroaches harder to get rid of than German cockroaches?
How do I get rid of American cockroaches?
The Sewer Roach That Comes Back Every August. We Close the Way It Gets In.
We confirm the species, map every drain and foundation entry point, treat the outside and the drains, and return if needed to confirm fewer are getting in. If you see these every summer, the way in was never closed. Cockroach Crackdown across McKinney, Allen, Frisco, Plano, and all of Collin County.