Pest control and exterminators in Greenwich, CT

By Hamad G., last reviewed October 20, 2026. Independent guide, not a pest control company.

Greenwich, CT residents can take a tick to the town’s own Department of Health laboratory in Town Hall, 101 Field Point Road; the fee schedule lists tick testing at $76. Because the town tests locally, CAES recorded only 6 Greenwich submissions in 2025. In 2026, the Civic Center mosquito trap logged 12 West Nile virus-positive samples.

Found a tick or a nest right now?

Tick bite: save the tick. Save it dry in a sealed bag; send it to CAES for free testing through your health department or by mail. See a doctor if a rash or fever follows. Town Department of Health lab in Town Hall, 101 Field Point Road: $76 per tick test; CAES tests free by mail. details about tick drop-off in Greenwich
Nest by the door: keep back. Keep people and pets away from the nest; trouble breathing or hives all over need medical care right away.
Droppings: air the room, then wet-clean. Air the room for 30 minutes, wear gloves and soak droppings with disinfectant or bleach before wiping; never sweep or vacuum them.
Suspected bed bugs: report it. Renters tell the landlord, who has five business days to inspect; homeowners ask a DEEP-registered pest control company to inspect.

What each step involves

Hiring an exterminator in Greenwich

Check its DEEP registration.
Get products, labels and notices in writing.
Compare two written quotes.
Greenwich's health lab tick leaflet suggests a barrier of wood chips between your lawn and wooded areas.

The full checklist

Pest control services in Greenwich

Greenwich is the one town of the 10 in this guide with a municipal laboratory that tests ticks itself, so the first step after a bite differs from its neighbors’. Seal the tick in a plastic sandwich bag, write the date and the place on the body where it bit, and bring it to the lab during public counter hours. The lab’s leaflet says it tests for the agents of Lyme disease and babesiosis and emails the result. If the $76 fee is a barrier, the free route is still open: any Connecticut resident can mail an engorged tick to the Connecticut Agricultural Experiment Station (CAES).

For insects and rodents in the house, the decision usually sits with the owner, because most occupied Greenwich homes are lived in by their owners. Renters and condominium owners have a landlord or an association to tell first, in writing, and Connecticut’s bed bug statute sets deadlines for the landlord.

Treatment with a pesticide needs a certified applicator working for a business registered with the Department of Energy and Environmental Protection (DEEP). CGS 22a-66c requires the business to print that registration number on its written contracts, vehicles and newspaper, billboard and directory ads. This site is a guide only, as its about page explains; it arranges no treatment and refers no one. Each service guide, with the Greenwich detail:

Termite inspection for an older Greenwich house and termite control around Greenwich foundations: 25.6% of Greenwich homes were built before 1940, and the median dates from 1963.
Carpenter ants in Greenwich porches, chimneys and decks: if the winged insects at a window could be either pest, the comparison of carpenter ants and termites shows what to look at.
Tick control for Greenwich lawns along woods and stone walls: the town lab’s own leaflet suggests a barrier of wood chips between lawn and woods.
Wasp and hornet nests on Greenwich houses and outbuildings: Greenwich keeps no nest records; CAES’s statewide sheet suggests a professional for nests that are hard to reach, especially inside buildings.
Mouse and rat control in Greenwich homes: 63.7% of housing units are detached, so most owners seal and trap on their own property.
Bed bugs in Greenwich apartments and condominiums: 30.0% of occupied homes are rented, and an owner who rents out a condo is the landlord under the state law.
Cockroach control in Greenwich kitchens and basements: there is no town count; CAES’s statewide fact sheet finds American cockroaches more often in restaurants and grocery stores than in private homes.
Commercial pest control for Greenwich restaurants, retail and offices: under Connecticut’s food code, a food business needs a permit from the local director of health, here the town Department of Health.
Spotted lanternfly in Greenwich: the record is county-wide, not Greenwich’s: CAES reports it in Fairfield County since 2020 and in all counties by 2025.

Nearby towns: Stamford, whose city lab forwards ticks to CAES, is right next door; past it are Darien, with the second-oldest housing in the county, and Norwalk, where the state’s first lone star ticks bred.

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Costs, choosing a company and rentals

Average treatment for a standard infestation (national): $171 (This Old House, March 2026).

Pest calendar

Ticks and mosquitoes by month (CAES)
Pest	Peak months	January	February	March	April	May	June	July	August	September	October (this month)	November	December
Blacklegged tick nymphs, ¹	May–Jul	none reported	none reported	none reported	none reported	peak	peak	peak	active	active	none reported	none reported	none reported
Blacklegged tick adults, ¹	Mar–Apr, Oct–Nov	active	active	peak	peak	active	none reported	none reported	none reported	none reported	peak	peak	active
Mosquitoes (West Nile virus risk), ²	Jul–Sep	none reported	none reported	none reported	none reported	none reported	active	peak	peak	peak	active	none reported	none reported

Peak: the busiest months
Active
None reported
October (this month)

Sources

See the full pest calendar

Why pests in Greenwich run through the town lab

Why does the state’s tick count show only six Greenwich ticks?

Greenwich runs its own tick laboratory, so most Greenwich ticks never reach the state lab. CAES lists 6 Greenwich blacklegged ticks for 2025, of which 4 were tested and 1 carried the Lyme bacterium, in its 2025 tick testing summary. The town’s Department of Health laboratory offers “Identification and testing of ticks associated with Lyme Disease” to residents, so the state’s count measures where people sent ticks, not how many bite people in Greenwich. A share built on four ticks says almost nothing either way. Better guides to local risk are regional. The town itself reposted a CAES announcement that adult female blacklegged ticks collected at field sites in this part of the state had the highest Lyme infection rate in Connecticut in the 2025 survey, 68%.

Should a Greenwich resident use the town lab or mail a tick to CAES?

A Greenwich resident can use either lab; the choice is convenience against cost and the list of tests. The town lab’s tick leaflet says to bring the tick “dead or alive” to the lower level of Town Hall, where it is tested for Lyme disease and babesiosis, with results by email; the fee schedule lists “Tick Testing $76”. The state route is free. CAES’s submission page says there is no cost to identify or test a tick, but it tests only blacklegged ticks that fed on a person, and it screens them for Lyme, anaplasmosis, babesiosis, Borrelia miyamotoi and Powassan virus. Ticks from pets, unfed ticks and males are not tested. Whichever lab you pick, neither result is a diagnosis: tell a doctor about a fever, rash or aches after a bite.

Do Greenwich’s older houses need a termite inspection?

Many are old enough that a buyer or owner should ask. In Greenwich, 25.6% of homes were built before 1940 and 47.8% before 1960, by the Census Bureau’s year-built counts, and the median year built is 1963. The CAES termite fact sheet points to construction details rather than age: polystyrene foam board below grade, wooden porches or decks without metal flashing where they meet the house, and climbing plants on the walls all give termites a way in. Damaged wood “will appear intact externally but will sound hollow if tapped.” If termites are found, the sheet strongly suggests a professional, whose options “may include direct soil injections of termiticides, baits, or barrier treatments around foundations.” Most Greenwich housing is detached, 63.7% of units by the units-in-structure count, so each owner carries the inspection alone.

How does the bed bug law work in a Greenwich rental or condo?

Connecticut’s bed bug law covers every rented unit in Greenwich except a detached single-family house, and 30.0% of the town’s occupied homes are rented, by the Census Bureau’s tenure count. Under CGS 47a-7a, the tenant tells the landlord, and within five business days the landlord inspects or sends a qualified inspector. If the landlord inspects personally, the tenant gets a written result within two days, with contact details for the local health department. The statute lets a landlord try treating the unit first, but a landlord who treats without a pest control agent must vacuum beforehand, have a qualified inspector check again within five business days after the treatment, and hire a pest control agent within five business days if bugs remain. A condominium owner who rents out a unit is the landlord for that tenant.

Where does West Nile virus show up in Greenwich?

Mostly at the Civic Center. CAES runs three Greenwich traps, at the Civic Center, Lake Avenue and Mianus River Park, by its trap list. The 2026 summary shows 12 West Nile virus-positive samples at the Civic Center by October 13, tied with Stratford’s Beacon Point for the most at any single trap in the county, and 2 at Mianus River Park. The same summary lists Jamestown Canyon virus in 1 sample from Babcock Preserve, a site missing from the 2020-2026 trap list. In 2025 the pattern was flatter: 5 at the Civic Center, 6 at Mianus River Park and none at Lake Avenue, per the 2025 final summary. Near any of these sites, the part a household controls is standing water in its own yard.

The Mianus River running shallow over boulders through leafless woods in early spring. — The Mianus River in Mianus River Park, March 2013. The park is one of CAES’s three Greenwich mosquito trap sites, with the Civic Center and Lake Avenue. Photo: Morrowlong, CC BY-SA 3.0; edited.

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Ticks and mosquitoes in Greenwich, beyond the state count

CAES lists 6 Greenwich ticks for 2025 because the town runs its own lab, which tests residents’ ticks for $76, so most never go to New Haven. Of the 4 CAES tested, 1 (25%) carried the Lyme bacterium, according to the 2025 summary; in 2024, CAES identified 7 and found 1 of 4 tested positive (25%), per the 2024 summary. Treat both years as a count of submissions to the state lab, not a sign that Greenwich has few ticks. Illness data stop at the regional level: the Western Connecticut planning region, Greenwich’s, had 534 cases in 2023 in CDC’s Lyme dataset.

For mosquitoes, the three Greenwich traps produced 11 West Nile virus-positive samples in 2025 and 14 by October 13, 2026, per the CAES summaries linked above. Each is a pooled catch of mosquitoes from one trap, tested together as a batch. People are most at risk from July through September, by the CAES mosquito brochure. Greenwich’s row in the tick and mosquito CSV, explained in the tick season guide, carries a note about its lab.

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Exterminator prices and registration checks for Greenwich

How much does pest control cost for a large Greenwich house?

Greenwich has no published price, and neither does Connecticut, so the figures are national and size-based. This Old House gives $450 to $750 for a 3,000-square-foot home and says a job can run from as little as $50 to as much as $8,000 (national data, as of March 2026). With most Greenwich housing detached, square footage and outbuildings will shape any quote more than the town does. Compare the publishers in the cost guide, and note the one Greenwich fee that is published: $76 for a tick test at the town lab.

Where can I confirm a Greenwich exterminator is registered with DEEP?

On DEEP’s information look-up page, which links a single-registration search and a downloadable roster of active registered pesticide businesses. DEEP warns that recently expired or lapsed registrations may still show on a downloaded roster, so for a Greenwich job, search the firm’s number directly as well; questions go to DEEP’s Pesticide Management Program at (860) 424-3369.

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Offices to call in Greenwich

Department of Health laboratory: Town Hall, 101 Field Point Road, Greenwich, CT 06830; public counter Monday to Friday, 8:00 am to 3:00 pm; 203-622-7843. Besides ticks, it tests well water and water for lead.
Tick testing: submission instructions and the intake form are on the town’s tick page; the Environmental Services fee schedule lists tick testing at $76.
Town Hall main line: 203-622-7700, for a rental housing problem the Department of Health should hear about; CGS 47a-7a lets a tenant contact any agency at any time.
CAES Tick Testing Laboratory: the no-fee alternative to the $76 town test; see its submission page for the form and where to post it.

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Sources

Frequently asked questions

Can I get a tick tested in Greenwich, CT?

Yes. Bring it, dead or alive, in a sealed plastic bag marked with the date and site of the bite, to the Department of Health laboratory on the lower level of Town Hall, 101 Field Point Road, weekdays 8 am to 3 pm. The town fee schedule lists tick testing at $76, and results are emailed.

Why does Greenwich have so few ticks in the state's tick testing data?

Because most Greenwich ticks go to the town's own laboratory instead of CAES. CAES listed only 6 Greenwich submissions in 2025, but that counts submissions to CAES, not ticks in Greenwich. The 2025 CAES field survey found Lyme bacteria in 68% of adult female ticks from sites in this part of the state.

How long do you have to get Lyme from a tick?

The Greenwich Department of Health's tick leaflet says the risk of Lyme disease from an infected tick can be greatly reduced when the tick is removed in the first 24 hours. Remove it with thin-tipped tweezers, pulling straight up, then save it for testing and watch for symptoms over the next 30 days.

Which Greenwich mosquito trap found the most West Nile virus?

The Civic Center trap. By October 13, 2026 it had 12 West Nile virus-positive samples, level with Stratford's Beacon Point for the most at any single trap in Fairfield County. Mianus River Park had 2. Each sample is a pooled batch of mosquitoes, so the count shows where the virus is circulating, not how many people are at risk.