Why You Should Always Hire a Certified Arborist

When a tree on your property needs attention, you have two basic options: call a general tree service or hire a certified arborist. On the surface, both might seem to offer the same thing. They both show up with chainsaws and trucks. They both cut branches and remove trees. But the similarity ends there. The difference between a certified arborist and a general tree service is the difference between a licensed surgeon and someone who owns a scalpel. One understands the science behind what they are doing; the other is just cutting.

What ISA Certification Actually Means

The International Society of Arboriculture, or ISA, is the globally recognized credentialing body for tree care professionals. To earn the title of ISA Certified Arborist, a candidate must meet rigorous requirements. They need a minimum of three years of full-time, hands-on experience in arboriculture, or a combination of education and experience. They must pass a comprehensive exam covering tree biology, diagnosis, pruning, safety, soil science, tree risk assessment, and urban forestry. And unlike a one-time credential, ISA certification must be renewed every three years through continuing education, ensuring that certified arborists stay current with evolving science and industry best practices.

This is not a weekend course or an online certificate. It represents a deep, verified understanding of how trees grow, what threatens them, and how to care for them properly.

Why Certification Matters for Tree Health

Trees are complex living organisms, and how you prune, treat, or remove them has lasting consequences. A certified arborist understands tree biology at a level that directly affects the quality of work performed on your property.

Proper pruning cuts. There is a specific location on every branch where a pruning cut should be made, just outside the branch collar. Cut too close to the trunk and you create a wound the tree cannot seal properly, inviting decay. Cut too far out and you leave a stub that dies back and becomes an entry point for disease. A certified arborist knows exactly where to cut and why, and they follow ANSI A300 pruning standards that represent the scientific consensus on best practices.

Disease and pest identification. Many tree diseases and pest infestations look similar to the untrained eye. Bacterial leaf scorch can mimic drought stress. Emerald ash borer damage can be confused with other wood-boring insects. A certified arborist can accurately diagnose the problem and recommend appropriate treatment, rather than guessing or defaulting to removal. Early, accurate diagnosis can save a tree that might otherwise be lost.

Risk assessment. Not every leaning tree is dangerous, and not every straight-standing tree is safe. Certified arborists are trained in Tree Risk Assessment Qualification (TRAQ), a systematic method for evaluating the likelihood and consequences of tree failure. This means they can tell you with informed confidence whether a tree needs to come down, needs structural support, or is perfectly fine despite its appearance. Explore our full range of professional tree care services to see what proper arboricultural care looks like.

Liability and Insurance Considerations

Tree work is inherently dangerous. It regularly ranks among the most hazardous occupations in the country. When you hire someone to work on your trees, you need to know that they carry proper insurance, both general liability and workers' compensation.

A certified arborist operating a legitimate business will carry adequate insurance and be happy to provide proof before starting any work. If an uninsured worker is injured on your property, you could be held financially liable for their medical expenses, lost wages, and more. If an uninsured crew drops a limb on your neighbor's roof, you may be on the hook for repairs.

Beyond insurance, certified arborists are more likely to follow OSHA safety standards, use proper personal protective equipment, and employ safe rigging techniques. The certification process itself covers safety extensively, and the continuing education requirement ensures ongoing awareness of current safety protocols.

Red Flags of Unqualified Tree Companies

Unfortunately, the tree care industry has its share of unqualified operators. Knowing the warning signs can save you from costly mistakes and potential damage to your trees. Watch out for these red flags:

• Door-to-door soliciting. Reputable tree companies do not drive through neighborhoods knocking on doors offering to cut your trees. This is one of the most common tactics used by fly-by-night operators, especially after storms when homeowners are desperate for help.
• Topping trees. Any company that recommends or performs tree topping, the practice of indiscriminately cutting back large branches to stubs, is advertising their incompetence. Topping is universally condemned by every legitimate arboricultural organization. It destroys tree structure, promotes weak regrowth, increases long-term hazard, and disfigures the tree permanently.
• No proof of insurance. If a company hesitates to show you a current certificate of insurance, walk away. No exceptions.
• Demanding full payment upfront. Legitimate companies may request a deposit for large jobs, but demanding full payment before any work begins is a major red flag.
• Using climbing spikes on living trees. Climbing spikes puncture the bark and create wounds on every step. They are appropriate for tree removal but should never be used on a tree that is being pruned or preserved.
• No written estimate or contract. Professional tree care companies provide detailed written estimates that specify the scope of work, the price, and the timeline. Verbal agreements leave you with no recourse if the work is done poorly or left incomplete.

Questions to Ask Before You Hire

Before signing a contract with any tree care provider, ask these questions to protect yourself and your trees:

• Are you an ISA Certified Arborist? Can I see your credential number?
• Do you carry general liability insurance and workers' compensation? Can you provide a current certificate?
• Will you provide a written estimate detailing the specific work to be performed?
• Do you follow ANSI A300 pruning standards?
• Can you provide references from recent clients?
• Will you be doing the work yourself, or subcontracting it out?

A qualified professional will answer all of these questions without hesitation. Anyone who gets defensive or evasive is telling you everything you need to know.

Proper Tree Care Preserves Property Value

Mature, healthy trees can add 10 to 15 percent to a property's appraised value. A single large shade tree can be worth tens of thousands of dollars according to established arboricultural valuation methods. When you hire an unqualified company that tops your trees, makes improper pruning cuts, or removes trees that could have been saved, you are literally cutting into your property's value.

Conversely, a certified arborist can develop a long-term care plan for your trees that maximizes their health, appearance, and structural integrity for decades. Regular, professional maintenance is an investment that pays for itself many times over in curb appeal, energy savings from shade, and avoided emergency costs from preventable failures.

The Bottom Line

Your trees are valuable assets that deserve expert care. Hiring a certified arborist is not about paying more for the same service. It is about getting a fundamentally different level of knowledge, accountability, and professionalism. The cheapest quote is almost never the best value when it comes to tree care.

At County Tree Service, our team brings ISA-certified expertise to every job, from routine pruning to complex removals. We carry full insurance, follow industry best practices, and treat every tree on your property with the care it deserves. Schedule your free estimate or call us at (708) 484-4808 to experience the difference a certified arborist makes.