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Arborist — ARB
Total cost: $610-$1,715
Governing Authority
California Department of Pesticide Regulation / Contractors State License Board
Official website →Some details on this page are not yet confirmed against an official source. See sources below or contact the licensing board to verify.
C-27 Landscaping or D-49 Tree Service Contractor License
State License
Voluntary
ISA Certification
Required
Pesticide License
Required
State Exam
Yes
CE Required
$610-$1,715
Total Initial Fees
Licensing, certification, and permit requirements for commercial tree care
VerifiedState License
Required
C-27 Landscaping or D-49 Tree Service Contractor 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
QAL or QAC required from CA DPR. The relevant pest control category for landscape/ornamental tree work is Category B (Landscape Maintenance). DPR requires passing the Laws, Regulations, and Basic Principles exam plus at least one pest control category exam.
Business License
Required
Contractor License
Required
C-27 Landscaping or D-49 Tree Service specialty contractor 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
4 years journey-level experience or combination of education and experience for contractor license
Experience Requirements
4 years journey-level experience for contractor license; ISA requires 3+ years
ISA Exam
Not Required
State Exam
Required
Trade exam for C-27 or D-49 contractor license through CSLB
Continuing Education
ISA Certified Arborists need 30 CEUs per 3-year cycle. State license also requires CE credits for renewal. Pesticide applicator recertification requires ongoing CE credits.
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 California, 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 for licensed contractors; minimum $1,000,000 per occurrence
Workers' Compensation
Required for all employers — even sole proprietors with 1+ employees
Property Damage
Property damage coverage included in general liability policy; tree care operations carry significant property damage risk
Bonding
Contractor bond of $25,000 required for CSLB license
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 C-27 Landscaping or D-49 Tree Service Contractor License application/exam fee | $330 (CSLB application + exam 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 California | $25-$100 |
Business License Business registration and licensing fees in California | $70-$800 |
Total Initial Fees Includes ISA certification exam, pesticide license, business license, and state license fees where applicable. Does not include insurance premiums. | $610-$1,715 |
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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
Biennial renewal; $450 CSLB renewal fee
CE Details
ISA Certified Arborists need 30 CEUs per 3-year cycle. State license also requires CE credits for renewal. Pesticide applicator recertification requires ongoing CE credits.
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.
California requires a C-27 Landscaping or D-49 Tree Service contractor license from CSLB for commercial tree work. The state also requires a Qualified Applicator License for any pesticide application to trees.
California requires a C-27 Landscaping or D-49 Tree Service Contractor 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 California for any chemical treatments on trees, including insecticide and fungicide applications, trunk injections, and soil treatments.
Contractor licensing note: C-27 Landscaping or D-49 Tree Service specialty contractor license required
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.
Arborist requirements in nearby states
See how California compares: Arborist License Fees by State — Cheapest to Most Expensive →
Compare arborist requirements across all states →
Arborist licensing requirements nationwide →
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How does California compare to other states for arborist? See the full comparison →
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Explore requirements for other professional licenses in California.
Arborist Schools in California
Compare approved training programs, costs, and requirements.
Study materials for ISA Certified Arborist exam and tree care licensing.
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Arborist requirements in California verified against California Department of Pesticide Regulation / Contractors State License Board, April 2026.
Accessed 2025-01-15
Accessed 2025-01-15
Moving to California? Use our free Transfer Tool to see what you need →
Already licensed elsewhere? See how to transfer your Arborist license to California →
California requires a C-27 Landscaping or D-49 Tree Service Contractor 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 California Department of Pesticide Regulation / Contractors State License Board.
Requirements vary by state and municipality. Always verify current requirements with your state licensing authority and ISA.