Termites in New Jersey: Swarm Season, Wells and the State's Termite Rules

New Jersey spells out its termite treatment rules in unusual detail, especially around private wells. The rules decide when a company can treat, how close it can get to a well and how often it can come back. Here's what that means for a New Jersey house.

By John Updated 5 min read Termite pressure: Slight to moderate
Sketch map of New Jersey labeled with slight to moderate termite pressure

The short version

New Jersey's termites are native subterranean termites, which usually swarm on warm, sunny days from April to June. State rules require a certified termite applicator on site, limit soil treatment near wells, allow routine liquid retreatment only after five years, and require the company to give you the rules before you sign. Sellers answer five termite questions on the disclosure form.

New Jersey at a glance

Termite pressure
Slight to moderate
Termites to know
Eastern subterranean
Why termites like it here
Four seasons with humid summers and native subterranean termites statewide.
Inspection report for home sales
NPMA-33 Wood Destroying Insect Inspection Report
On this page
  1. The termites New Jersey has
  2. When termites swarm in New Jersey
  3. What Rutgers says about treatment
  4. New Jersey's termite treatment rules
  5. Wells change the job
  6. The paperwork you should get
  7. Selling a house with a termite history
  8. For New Jersey homeowners
  9. Questions

The termites New Jersey has

Rutgers Cooperative Extension says the native termites of the Northeast are subterranean termites, which nest in soil and build mud tubes to reach wood. A mature colony holds 60,000 to 1 million termites, and Rutgers estimates that a colony of 60,000 can eat about 5 grams of wood a day and spread across roughly 260 feet.

Swarmers usually leave colonies on warm, sunny days from April to June, and that's when many New Jersey homeowners first notice termites. Rutgers adds a regional point worth knowing: in the Northeast, infestations almost always start outside the house. Drywood termites aren't native here, though Rutgers notes they can arrive in infested furniture or lumber. The ant-or-termite question is in flying ants vs termites.

When termites swarm in New Jersey

Rutgers puts New Jersey's swarms on warm, sunny days from April to June.

Typical swarm months for the eastern subterranean termite
Termite J F M A M J J A S O N D
Eastern subterranean Daytime, often after a warm rain some swarms peak peak common some swarms

What Rutgers says about treatment

Rutgers' fact sheet is clear that termite control is a job for licensed professionals with special training and equipment, and it lays out the trade-off:

  • Liquid soil treatment is often cheaper and protects right away. Colonies may be eliminated within one or two months, and treatment can last more than five years. It's also more disruptive, uses more insecticide and can't be used near wells, springs or cisterns.
  • Baits have less environmental impact and cause little property damage. They're slower and need ongoing checks, and stations can be dislodged by people, children or pets.

Rutgers recommends inspecting at least once a year, in summer. How the methods compare in detail is in termite treatment options.

New Jersey's termite treatment rules

From the state Pesticide Control Code, N.J.A.C. 7:30-10.4, as published through 2025.

Termiticide rules a New Jersey homeowner can use
Rule What it means for you
Certified applicator on site At least one applicator certified in the termite subcategory must be present
Rules before the contract Before you sign, the company gives you a copy of the rule or a state-approved summary (not required for bait-only jobs)
Retreatment limit Liquid retreatment only after five years, unless there's reinfestation or the soil barrier was disturbed
Treatment diagram The company keeps a diagram of the treated structure for at least five years
Wet basements A basement with standing water in a sump pit isn't treated
Plenum crawlspaces Occupants are advised to leave during treatment and for a 24-hour airing-out period
Air ducts under a slab You get a written warning about possible duct contamination

The baits exception matters. A bait-only treatment isn't subject to the five-year retreatment limit or the requirement to hand you the rule before signing. See termite bait stations.

Wells change the job

The well rules are where New Jersey differs most. Under N.J.A.C. 7:30-10.4, a company may not treat a structure that has a well, cistern or spring in use or capable of being used, with listed exceptions, unless the well is sealed to state specifications. For a water source nearby but outside the house, distance decides:

  • If the well is more than 20 feet away in sandy soil, or more than 100 feet in other soils, treatment follows the label.
  • If it's closer than that, foundation wall voids aren't treated, and soil within two feet of water or septic lines isn't treated.
  • Where a downhill well is connected to the treatment area by something like a paved driveway, the company has to block or dike the path.

Rutgers also notes liquid treatments can't be used near wells, springs or cisterns, which is one reason to ask about baits on a well property. Ask any company how it plans to handle your well before it quotes.

The paperwork you should get

New Jersey's consumer notice rule, N.J.A.C. 7:30-9.12, requires companies to give residents written information before an application: the pesticide's brand and active ingredient names, the label's safety precautions such as leaving the house or covering food, the company's contact information, emergency and poison control numbers, and the Pesticide Control Program's number for complaints. For termite jobs, that notice includes the termite rule or its summary. A copy of the label is available on request. You can sign a waiver declining the information, and you can withdraw it in writing at any time.

Selling a house with a termite history

New Jersey's property condition disclosure form, set out in the state's real estate rules, asks sellers five termite questions: whether they're aware of termites or other wood-destroying insects, dry rot or pests affecting the property; whether they know of damage from them; whether the damage was repaired; whether the property is under contract with a licensed pest control company; and whether they know of past termite inspections or treatments. Buyers usually get a wood-destroying insect report too; VA loans require one statewide in New Jersey. See WDI inspection and termite disclosure laws.

For New Jersey homeowners

Do

  • Tell the termite company about any well, cistern or spring
  • Read the rule summary the company gives you before you sign
  • Keep the treatment diagram and the consumer notice
  • Inspect once a year, in summer

Don't

  • Accept a liquid retreatment within five years without reinfestation
  • Let a company treat a wet basement with water in the sump
  • Waive the consumer information without reading it first
  • Leave termite history off the disclosure form

Questions people ask

When do termites swarm in New Jersey?

Rutgers says termite swarmers usually leave colonies on warm, sunny days from April to June, which is when many homeowners first notice them.

Can termites be treated near a well in New Jersey?

With limits. State rules bar treating a structure with a usable well, cistern or spring in it, with exceptions, and restrict treatment when a water source is within 20 feet in sandy soil or 100 feet in other soils. Baits are often used instead.

How often can a New Jersey house be retreated for termites?

Liquid retreatment is allowed only after five years, unless there's a reinfestation or the soil barrier was disturbed. Bait treatments aren't subject to that limit.

Do New Jersey sellers have to disclose termites?

The state's property condition disclosure form asks about termites and other wood-destroying insects, related damage and repairs, any current pest control contract and past inspections or treatments.

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