Great service! Leo, our technician was very knowledgeable and professional, he helped me understand the do's and don'ts and how to keep my house free of pests. The green company is very pet and child friendly so we didn't loose time from our daily lives. For privacy and out of respect for your property, technicians do not open closed doors so you gotta let them know which rooms you want service in. Price is great, and includes unlimited follow-ups. Great job, thank you.
Caroline Canning
Tim Cloud is thorough and well spoken when it comes to explaining treatment. He gets the job done and we do not experience pests in between sprays, which is really appreciated.
M Hughes
Nathan green services : it was such a pleasure to meet your technician Mr Raul Espinosa. He was very knowledgeable about his job and meticulously checked the property and explained to us that unluckily we are connected to other neighbors which would’ve made his work impossible since the others apparently don’t care about the presence of mice in their attics and the six owners would’ve had to decide to do the job. We really appreciate his time and knowledge . Such a great asset for your company.
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Catherine Raines
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Natran serviced my previous home and when I moved to my new house, I contacted them again since their service is excellent and they pay attention to detail.
Cindy Davis
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Radeen Kabir
Whether you have Marc, Raul, or Damion coming by your home for your pest control needs, you will be very pleased with their service. They are highly professional and thorough. After the first pest control folks we used incorrectly told us we had American cockroaches when in fact we had mice, we reached out to Natran and they came by right away. Natran's traps helped us exterminate a number of mice and they also sealed the openings at our home. I highly recommend their services. And Kate at their office is great and will connect you to the right pest control professional, who is very well trained and dependable.
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Mosquito-borne illness risk in Harris County: what Houston homeowners should know
Home > Blog > Mosquito-borne illness risk in Harris County: what Houston homeowners should know
Published Date - June 1, 2026
Article written by Katy Weintritt
A muggy Houston evening, a backyard that held water after the last storm, and the first whine of a mosquito by your ear: that combination is familiar to almost everyone in Harris County. The question worth asking is not whether mosquitoes will show up, but how much of a health risk they carry and what you can actually do about it at home. This guide walks through the mosquito-borne illness picture in Harris County, what the local data says about West Nile and other viruses, and a prevention-first plan that starts with your own yard before anything else. The approach leans on Integrated Pest Management: remove the conditions mosquitoes need first, then add personal protection, and treat only where it is warranted.
Quick start: mosquito-borne illness in Harris County at a glance
West Nile virus is the main mosquito-borne illness in Harris County and across the contiguous United States. Most people who get infected never feel sick; about 1 in 5 develop fever and flu-like symptoms, and roughly 1 in 150 develop serious neurologic illness [1].
The biggest lever you control is water. An immature mosquito needs only about 10 to 14 days in standing water to become a biting adult, so water sitting longer than five days around the home is the first thing to address [7].
Lowest-impact first steps: tip out containers, change birdbath water every few days, clear clogged gutters, and find the spots that keep holding water after rain or irrigation.
Quick inspection checklist: pot saucers, buckets, tires, toys, tarps, clogged gutters, A/C drip pans, low yard spots, and any container left outside.
DIY handles most yards. Call a licensed pro when standing water comes from a drainage problem you cannot fix, when a household member is older or has a chronic condition, or when your ZIP code shows confirmed virus activity and bites continue despite cleanup.
Houston versus Austin: flat, humid, flood-prone Houston tends to hold water in yards and storm drains, while Austin's limestone Hill Country drains faster but swings between drought and flash flooding, which leaves its own pockets of standing water.
Which mosquito-borne illnesses circulate in Harris County
West Nile virus is the one that matters most here. It is the leading cause of mosquito-borne disease in the continental U.S., and Texas reported 976 West Nile cases over the most recent five-year period, including 106 deaths statewide [3]. Harris County is no stranger to it: the virus has circulated locally since 2002, and county health officials recorded human cases again last year. In 2026, the first confirmed human West Nile case in all of Texas was a Harris County resident, diagnosed with the more severe neuroinvasive form [3].
Most infections are quiet. The CDC estimates about 80% of infected people have no symptoms at all. Around 20% develop West Nile fever, which can bring fever, headache, body aches, joint pain, vomiting, or a rash, and fewer than 1% develop neuroinvasive disease affecting the central nervous system [2]. Symptoms usually appear 2 to 14 days after a bite. Risk of serious illness climbs with age; the CDC notes that people 65 and older are roughly three times as likely to develop neurologic illness, and people with conditions like diabetes, hypertension, kidney disease, or a weakened immune system also face higher risk [2]. There is no vaccine and no specific antiviral treatment, which is why prevention does the heavy lifting [1].
West Nile is not the only virus the county watches. Harris County Public Health tests its mosquito traps for West Nile, St. Louis encephalitis, dengue, chikungunya, and Zika [5]. Dengue, chikungunya, and Zika cases in Texas are mostly travel-related, picked up in regions where those viruses are common, though the mosquito capable of spreading them does live in local yards.
Illness
Most common local carrier
What homeowners should know
West Nile virus
Culex, the southern house mosquito
The main local risk; most infections cause no symptoms, serious illness is uncommon but real
St. Louis encephalitis
Culex
Historically present in the region, detected rarely
Dengue, chikungunya, Zika
Aedes aegypti, a daytime container breeder
Usually travel-related in Texas; the carrier can still breed in yard containers
If someone in your home develops a high fever with a stiff neck, confusion, severe headache, muscle weakness, or vision changes during mosquito season, that is a reason to contact a healthcare provider rather than wait it out [2].
Why mosquito pressure runs high in Houston and Austin
Two different mosquito groups drive the problem, and they like different water. Aedes aegypti, the daytime biter linked to dengue and Zika, breeds in containers: buckets, birdbaths, old tires, anything that traps a bit of water close to the house. Culex, the group that carries West Nile, prefers stagnant water with high organic content and tends to build up as summer dries out, often in low-lying spots and underground storm drains where water sits and stagnates [6]. Texas A&M AgriLife entomologist Sonja Swiger points out that most urban mosquito issues actually develop underground in storm drains, which is exactly the kind of habitat a flat, drainage-heavy metro like Houston has in abundance [6].
Houston's setup raises mosquito pressure in specific ways. The flat terrain, heavy clay soils, frequent heavy rain, and high humidity all keep water around longer. Pier-and-beam foundations leave shaded, damp crawl spaces. After a tropical system or a hard summer downpour, container habitats fill across entire neighborhoods at once, and county officials note that summer rains can create a perfect storm for breeding [5]. Austin's profile differs. The limestone Hill Country terrain drains faster and the climate runs drier, but the region cycles between drought and sudden flash flooding, so water still collects in saucers, clogged gutters, and slow-draining yard pockets. Both cities sit in the warm part of Texas where mosquito activity can stretch close to year-round, with the heaviest months running roughly May through October [4][5].
Lower the risk the IPM way
Integrated Pest Management puts the cheapest, lowest-impact tools first. For mosquitoes, that order is clear: take away the water, keep them out of the house and off your skin, watch what is actually happening in your yard, and treat narrowly only when the situation calls for it. Many Houston homeowners search for green or eco-friendly mosquito control, and in practice that usually points to exactly this sequence: source reduction first, targeted tools last.
Source reduction and habitat modification
This is where most of the result comes from, and it costs almost nothing. Walk the property and deal with standing water:
Tip or empty anything holding water: pot saucers, buckets, kids' toys, tarps, wheelbarrows, and tires.
Change birdbath and pet bowl water every three to five days [5].
Clear clogged gutters and downspouts so they drain instead of pooling.
Check the hidden spots: A/C condensate pans, leaky outdoor faucets, recycling bins, and the rim of trash can lids.
Empty or store containers upside down between uses.
Harris County Public Health sums this up as the three Ts: Tip, Toss, and Take Action [5]. The reason the five-day rule works is timing. Because a mosquito needs about 10 to 14 days of standing water to mature, removing or refreshing water on a shorter cycle interrupts the breeding before adults emerge [7]. For water you genuinely cannot drain, like a rain barrel or an ornamental feature, habitat modification shifts to drainage. Some yards collect water in the same low spots after every rain, and when that keeps happening the fix is grading or drainage correction rather than repeated cleanup. Trimming back dense, shady vegetation near the house also helps, since adult mosquitoes rest in cool, protected greenery during the day [6].
Exclusion and personal protection
Keeping mosquitoes out of the house is straightforward and worth doing before any spray. Repair torn window and door screens, use door sweeps, and run air conditioning during peak season, which is one of the reasons Texas health officials emphasize intact screens and A/C as a barrier [3].
For skin protection, use an EPA-registered repellent. The EPA evaluates registered skin-applied repellents for human safety and effectiveness when used according to the label, and a registration number on the packaging is the marker to look for [9]. Texas DSHS specifically points to products with DEET or picaridin as effective against the bites that spread West Nile and the other viruses [3], and the EPA's online tool lets you filter products by active ingredient and protection time [8]. Other registered options include IR3535 and oil of lemon eucalyptus. Wear long, loose-fitting sleeves and pants when you are outside during active hours, and follow label directions for any product you apply, especially around children.
A note on timing: Culex mosquitoes, the West Nile carriers, are most active from dusk into the night, while the container-breeding Aedes bite during the day. That means there is no single safe window, so the habit of dressing for protection and using repellent whenever mosquitoes are biting matters more than the time on the clock.
Monitoring
You do not need lab equipment to monitor your own yard. The point is to know whether your efforts are working and whether pressure is rising. After each rain or watering, recheck the usual water-holding spots within a few days. If you find wrigglers, the larvae moving in standing water, that water is actively producing mosquitoes and needs to be drained or treated. At the neighborhood scale, Harris County Public Health runs countywide trapping and testing and publishes where mosquito samples have tested positive for viruses, so a quick check of the county's mosquito disease information tells you whether your area has confirmed activity in a given season [5]. That signal is useful: confirmed local virus activity plus continued biting is one of the clearer reasons to step up protection.
Targeted treatment, only when warranted
When source reduction is not enough, the IPM next step is narrow, not broad. For standing water that cannot be removed, a biological larvicide labeled for that use, such as products containing Bti (a naturally occurring soil bacterium that targets mosquito larvae), can be applied to the water following label directions [6]. This treats the problem at the source rather than spraying the whole yard. AgriLife's entomologists are candid about the limits of consumer adult-mosquito sprays and barrier treatments: effectiveness is limited, and homeowner-applied products may last only about a day [6]. That is a useful reality check before anyone reaches for a fogger as a first move.
Broadcast chemical spraying is a last resort, applied to a defined need rather than as routine maintenance, and any pesticide product should be used strictly according to its label. Harris County Public Health itself uses an Integrated Vector Management approach, prioritizing surveillance and larval control and reserving truck-based adult treatments for areas with confirmed disease activity [5]. The same logic applies at home: prevention and targeted larval control first, blanket spraying rarely if ever.
DIY vs licensed help
Most Harris County yards are well within DIY range. If your mosquito problem is mainly nuisance biting and you can find and fix the water sources, the steps above will carry you a long way. There is a decision path worth keeping simple. If you find standing water, drain it; if it cannot be drained, treat it with a labeled larvicide and recheck within a few days; if mosquitoes keep biting after that, or your ZIP code shows confirmed virus activity and someone in the home is higher-risk, bring in professional help.
A licensed professional is the right call in a few specific situations: when standing water traces back to a drainage or grading issue you cannot resolve yourself, when bites continue despite consistent source reduction, when a household includes adults over 65 or people with chronic conditions during a season with confirmed local West Nile activity, or when you are not sure which mosquito species you are dealing with. Misidentification matters, because a daytime container breeder and a dusk-active Culex call for different habitat fixes. For homeowners who want a structured, prevention-led plan rather than guesswork, professional mosquito control in Houston can map the breeding sites, focus on source reduction, and keep any treatment targeted and label-compliant.
Renters have a smaller toolkit but real influence. You can manage containers, report drainage and gutter problems to a landlord or HOA in writing, and keep screens in good repair. Pollinator-conscious households should know that source reduction and larval control are the parts of the plan least likely to affect bees and other beneficial insects, another reason to lean on them before any broadcast spray.
Mistakes to avoid
Reaching for a fogger or barrier spray first. It is the least durable step and skips the water sources that actually produce mosquitoes [6].
Forgetting the hidden water: A/C drip pans, gutter clogs, plant saucers, and the lip of trash can lids hold enough to breed a generation.
Letting birdbaths and pet bowls sit. Refresh them every three to five days [5].
Treating mosquito season as a summer-only problem. In warm parts of Texas, activity can run close to year-round, and Harris County has found virus-positive samples as early as winter [4].
Assuming county spraying covers you. Truck spraying is targeted to confirmed activity, not a substitute for clearing water around your own home [5].
Buying repellent without checking for an EPA registration number, which is the marker that a product was evaluated for safety and effectiveness [9].
Waiting out worrying symptoms. A high fever with confusion, stiff neck, or muscle weakness during mosquito season warrants a call to a healthcare provider [2].
FAQ
Is West Nile virus common in Harris County? The virus has circulated locally since 2002 and turns up most years. Harris County recorded human cases last year, and in 2026 the first confirmed human West Nile case in Texas was a Harris County resident [3]. Most infections cause no symptoms, but the risk is real enough that prevention is worthwhile every season.
What time of day do disease-carrying mosquitoes bite in Houston? It depends on the species. Culex, which carries West Nile, is most active from dusk into the night. Aedes aegypti, linked to dengue and Zika, bites during the day [6]. Because both are present, protection any time mosquitoes are biting makes more sense than relying on a fixed window.
Do I need to worry about dengue or Zika in Houston? Most dengue, chikungunya, and Zika cases in Texas are travel-related rather than locally acquired [3]. The mosquito that can spread them does breed in yard containers, so the same container cleanup that lowers West Nile risk also reduces this exposure.
How long does standing water take to breed mosquitoes? About 10 to 14 days for an immature mosquito to develop into a biting adult, which is why refreshing or removing any water that sits longer than five days is the single most effective home habit [7].
Are mosquito repellents with DEET okay for kids? The EPA evaluates registered repellents, including DEET and picaridin, for human safety and effectiveness when used according to the label [9]. Follow the label's age guidance and application directions, and when in doubt, choose a product and concentration suited to the time you will be outdoors using the EPA's selection tool [8].
Does the county spray my neighborhood, and is that enough? Harris County Public Health uses targeted spraying in areas with confirmed virus activity as part of a broader Integrated Vector Management program, not as a routine blanket treatment [5]. It is one layer. Clearing standing water at home remains the part you control directly.
What is the single most effective thing I can do at home? Remove standing water. Texas DSHS and county officials both point to taking away breeding sites around the home as the foundation of mosquito reduction [3][5]. Repellent and screens are important, but they work best on top of source reduction, not instead of it.
When should I call a professional? When standing water comes from a drainage problem you cannot fix, when bites persist despite consistent cleanup, when your area shows confirmed virus activity and a household member is higher-risk, or when you are unsure which mosquito you are dealing with.
Where to focus first
The Harris County mosquito-borne illness picture comes down to a manageable set of moves. West Nile is the main local risk, serious illness is uncommon but worth guarding against, and the most reliable protection starts in your own yard. Take away the water, keep mosquitoes out of the house and off your skin with EPA-registered repellents and intact screens, watch the spots that keep refilling, and save any treatment for a specific, label-directed need. If standing water traces to drainage you cannot resolve, or your area shows confirmed activity and the biting continues, that is the point to request an inspection. Natran Green Pest Control serves homeowners across Houston and Austin with a prevention-first, IPM-led approach, and an inspection can pinpoint the breeding sites and the few fixes that will make the biggest difference.
