Why Hiring an ISA Certified Arborist Matters
Not all tree care providers are equal. Learn why ISA certification matters and how to find a qualified arborist to protect your trees and your property.
What Is an ISA Certified Arborist?
An ISA Certified Arborist is a tree care professional who has been credentialed by the International Society of Arboriculture (ISA). To earn this certification, candidates must have at least three years of full-time experience in arboriculture and pass a comprehensive exam covering tree biology, diagnosis, pruning, safety, and management practices. Certified arborists must also complete continuing education to maintain their credential.
Why Certification Matters
Hiring an uncertified tree worker can lead to serious consequences:
- Improper pruning can permanently damage tree structure and health
- Topping trees (a common practice by unskilled workers) leads to weak, hazardous regrowth
- Incorrect pest or disease diagnosis can result in wasted money on unnecessary treatments
- Poor removal techniques can damage property, utility lines, and neighboring trees
- Liability issues arise when uninsured workers cause property damage or injury
What a Certified Arborist Brings
When you hire an ISA Certified Arborist, you benefit from:
- Science-based knowledge of tree biology, soil science, and plant health care
- Current best practices for pruning, planting, and tree risk assessment
- Proper diagnosis of pests, diseases, and structural issues
- Ethical standards required by ISA including a code of ethics
- Continuing education ensuring up-to-date knowledge of emerging threats and treatments
How to Find a Certified Arborist
- Use the TreeIssues arborist directory to find certified professionals in your area
- Visit the ISA website at treesaregood.org to verify credentials
- Ask for the arborist's certification number and verify it
- Request proof of insurance including liability and workers' compensation
- Get written estimates that specify the work to be performed
Red Flags to Watch For
Be cautious of tree care companies that:
- Go door to door soliciting work, especially after storms
- Recommend topping trees or use the term "hat-racking"
- Cannot provide proof of insurance
- Use climbing spikes on trees that are not being removed
- Offer prices that seem too good to be true
Your trees are valuable assets that deserve professional care. Taking the time to hire a qualified, certified arborist protects both your trees and your investment. Start with a tree health check to understand your trees' current condition.