Loading...
Loading...
Arborist — ARB
Total cost: $430-$1,160
Some details on this page are not yet confirmed against an official source. See sources below or contact the licensing board to verify.
Arborist License
State License
Voluntary
ISA Certification
Required
Pesticide License
Required
State Exam
Yes
CE Required
$430-$1,160
Total Initial Fees
Licensing, certification, and permit requirements for commercial tree care
VerifiedState License
Required
Arborist License
ISA Certification
Voluntary (Widely Accepted)
ISA Certified Arborist is the industry-standard credential recognized by clients, municipalities, and insurers
Pesticide Applicator License
Required for Tree Treatments
Required; Supervisory or Operational certification from CT DEEP
Business License
Required
Arborist licensing varies significantly by state. Some states require a specific arborist or tree expert license, while others rely on ISA certification as the professional standard. All states require a pesticide applicator license for chemical tree treatments. Some states also require a general contractor license for tree work above certain dollar thresholds.
Not sure if you need a arborist license? Check whether your state requires one.
Education, experience, and examination requirements
Mostly verifiedEducation Requirements
Degree in arboriculture, forestry, or related field preferred; or equivalent experience for state license
Experience Requirements
Minimum 2 years experience required for CT Arborist License (needs verification against DEEP directly)
ISA Exam
Not Required
State Exam
Required
Three-part exam: (1) written exam, (2) field tree identification exam, (3) oral exam. Administered by CT DEEP and the Tree Protection Examining Board. Exams held quarterly at the CT Agricultural Experiment Station in New Haven. Written exam must be passed minimum 3 weeks before oral exam date.
Continuing Education
State arborist license: 12 CE credits per 5-year period. ISA Certified Arborist (if held separately): 30 CEUs per 3-year cycle. Pesticide applicator recertification requires additional CE credits as specified by CT DEEP.
The ISA Certified Arborist credential requires a minimum of 3 years full-time experience in arboriculture (degree substitutions available). The exam covers tree biology, diagnosis and treatment, pruning, safety, soil science, and urban forestry. A passing score of 76% or higher is required.
Browse Arborist study materials on Amazon →(affiliate link)
International Society of Arboriculture (ISA) Certified Arborist Program
VerifiedCredential
ISA Certified Arborist
Issuing Body
International Society of Arboriculture (ISA)
Experience Required
3+ years full-time (degree substitution available)
Exam Format
200 multiple-choice questions, 3.5-hour time limit
Passing Score
76% minimum
Renewal Cycle
Every 3 years — 30 CEUs required
Exam Fee
$185 (ISA member) / $285 (non-member)
Exam Details
ISA Certified Arborist exam: 200 multiple-choice questions covering tree biology, diagnosis, pruning, safety, soil science, and urban forestry. 3.5-hour time limit. Minimum 76% passing score.
Advanced Certifications
ISA certification is the most widely recognized credential in the arboriculture industry. In Connecticut, ISA certification is voluntary but strongly recommended and often required by municipalities for tree work permits. Advanced certifications such as Board Certified Master Arborist (BCMA) and Tree Risk Assessment Qualified (TRAQ) demonstrate higher levels of expertise.
ISA Certified Arborist Exam
Questions
200 questions
Time Limit
3.5 hours
Format
Multiple choice
Cost of failing
Retake fee: $185 (ISA member) / $285 (non-member) exam feeInvest in preparation to pass the first time.
How long should you study? Most candidates study 2–4 weeks before taking the ISA Certified Arborist Exam.
Insurance Coverage for Tree Care Operations
Mostly verifiedGeneral Liability
Required; minimum $1,000,000 per occurrence for Arborist License
Workers' Compensation
Required for all employers with 1+ employees
Property Damage
Property damage coverage included in general liability policy; tree care operations carry significant property damage risk
Bonding
Not typically required for arborist licensing; may be required by some municipalities or clients
Tree care is considered a high-risk profession. General liability insurance with adequate coverage is essential for protecting against property damage and bodily injury claims. Workers' compensation insurance is required in most states for employers. Many clients and municipalities require proof of insurance before allowing tree work to proceed.
| Fee | Amount |
|---|---|
State License Fee Arborist License application/exam fee | $100 (initial license fee) |
ISA Certification Exam Fee One-time exam fee; ISA membership ($135/year for individual) reduces exam cost | $185 (ISA member) / $285 (non-member) exam fee |
Pesticide Applicator License Pesticide applicator exam and license fee in Connecticut | $25-$100 |
Business License Business registration and licensing fees in Connecticut | $120-$475 |
Total Initial Fees Includes ISA certification exam, pesticide license, business license, and state license fees where applicable. Does not include insurance premiums. | $430-$1,160 |
Use our licensing cost calculator to estimate your total investment including education and exam fees.
Calculate your licensing ROI →
See how quickly your license investment pays for itself.
Renewal Requirements & CE Obligations
Mostly verifiedEvery 3 years; requires 30 CEUs (Continuing Education Units) or retaking the certification exam
ISA Renewal
Annual or triennial renewal depending on state; continuing education credits required
Pesticide License
Required
Continuing Education
State License Renewal
CE cycle is 5 years (12 credits). Renewal cycle needs verification — may be 5-year, not annual. The pesticide supervisor cert (Category 3D) may be what renews annually.
CE Details
State arborist license: 12 CE credits per 5-year period. ISA Certified Arborist (if held separately): 30 CEUs per 3-year cycle. Pesticide applicator recertification requires additional CE credits as specified by CT DEEP.
Regulatory Board
ISA Certified Arborists must earn 30 Continuing Education Units (CEUs) every 3 years to maintain their credential. CEUs can be earned through conferences, workshops, college courses, and ISA-approved programs. Pesticide applicator licenses also require periodic renewal with continuing education. Failure to renew results in loss of credentials.
Connecticut requires an Arborist License from CT DEEP for anyone performing commercial tree care. This is one of the most comprehensive state arborist licensing programs in the country.
Connecticut requires a Arborist License for commercial tree care operations.
ISA Certified Arborist credential is the industry standard, requiring 3+ years experience, passing the ISA exam, and 30 CEUs per 3-year renewal cycle.
A pesticide applicator license is required in Connecticut for any chemical treatments on trees, including insecticide and fungicide applications, trunk injections, and soil treatments.
TCIA (Tree Care Industry Association) accreditation is available for tree care companies seeking to demonstrate commitment to safety and professionalism.
There is no interstate compact for arborists. ISA Certified Arborist is a voluntary credential, not a state license.
The CT arborist license is classified as Category 3D under the Commercial Pesticide Supervisor certification. The license is a separate entity from ISA certification.
Arborist requirements in nearby states
| State | Total Cost | Timeline | |
|---|---|---|---|
| Connecticut (you) | $360–$1,185 | 6–16 wks | |
| Massachusetts | $260–$885 | 6–16 wks | → |
| New York | $260–$885 | 4–10 wks | → |
| Rhode Island | $260–$885 | 4–10 wks | → |
See how Connecticut compares: Arborist License Fees by State — Cheapest to Most Expensive →
Compare arborist requirements across all states →
Arborist licensing requirements nationwide →
Not sure arborist is right for you? Find careers that match your situation →
How does Connecticut compare to other states for arborist? See the full comparison →
Calculate the return on investment for your arborist license →
Explore requirements for other professional licenses in Connecticut.
Arborist Schools in Connecticut
Compare approved training programs, costs, and requirements.
Study materials for ISA Certified Arborist exam and tree care licensing.
Browse Study Guides on Amazon →As an Amazon Associate, we earn from qualifying purchases.
Shop essential tools and supplies to get started in your career.
As an Amazon Associate, we earn from qualifying purchases.
Not sure this is the right career? Take a 2-minute quiz →
Answer 6 quick questions and we'll match you with the best-fit licensed profession.
Arborist requirements in Connecticut verified against Connecticut Department of Energy and Environmental Protection, April 2026.
Accessed 2025-01-15
Accessed 2025-01-15
Accessed 2025-01-15
Moving to Connecticut? Use our free Transfer Tool to see what you need →
Already licensed elsewhere? See how to transfer your Arborist license to Connecticut →
Transfer your Arborist license from Connecticut to: Massachusetts → | New York → | Rhode Island →
Connecticut requires a Arborist License for commercial tree care. ISA Certified Arborist is the recognized industry credential. A pesticide applicator license is required for chemical tree treatments. Licensing and permits are managed through the Connecticut Department of Energy and Environmental Protection.
Requirements vary by state and municipality. Always verify current requirements with your state licensing authority and ISA.