Anyone can start a tree company, buy a chainsaw, and call themselves a "tree expert." ISA certification is the only nationally recognized credential that proves a tree professional has passed comprehensive exams, met minimum experience requirements, and stays current with ongoing education.
For you as a property owner, that distinction matters — not just for your trees, but for your liability, your budget, and your safety.
At JC Tree Experts, Javier Castaneda Jr. is your ISA Certified Arborist and lead consultant on every job. When you call us, you're getting a certified expert — not a sub-contractor who may not be.
Javier Castaneda Jr.
ISA Certified Arborist #WE-10110A
15+ years serving the Bay Area
CSLB Licensed #1057201
Consulting Arborist & Estimator
What It Is
The ISA (International Society of Arboriculture) is the world's leading organization for tree care professionals. Their Certified Arborist credential requires candidates to:
There is no shortcut to becoming ISA Certified. It is earned through experience, study, and ongoing professional development.
✓ Javier Castaneda Jr. — ISA Certified Arborist #WE-10110A
Why It Matters to You
ISA certification isn't just a title — it directly affects how your trees are diagnosed, pruned, and removed. Here's what you actually get when you hire a certified arborist.
Certified arborists are trained to identify disease, pest damage, structural defects, and root problems — and distinguish a dying tree from one that can be saved. That distinction alone can save you the cost of unnecessary removal.
Non-certified climbers often use tree spikes for convenience. Spikes puncture the bark and damage the cambium layer, creating wounds that invite disease. ISA standards prohibit spike-climbing on trees that are not being removed.
Bad pruning — topping, lion-tailing, flush cuts — shortens tree lifespan and creates hazards. A certified arborist knows where to cut, how much to remove, and how to leave a tree structurally sound for decades.
If a tree falls and causes damage, an arborist report documenting tree condition and professional recommendations can be critical for insurance claims and legal disputes. Only ISA Certified Arborists can provide credible written reports.
A certified arborist won't recommend removal to generate a sale if the tree can be saved. Their obligation is to the tree's health and your best interest — backed by professional ethics standards.
Healthy, well-maintained trees add 10–20% to property value according to USDA research. Improper pruning or unnecessary removals do the opposite. Certification means your trees are in hands that protect that investment.
When You Need a Report
Beyond routine tree care, there are situations where you need a written professional opinion — from an arborist who can stand behind it.
Many Bay Area cities require a written arborist report to approve the removal of protected trees. Javier can prepare the documentation you need.
When a tree's condition or placement becomes a legal matter, a certified arborist's written assessment carries professional weight that no contractor's opinion can match.
Buying a home with mature trees? We can inspect and assess condition, risk, and value — before you close — so there are no surprises after you move in.
Whether you need routine tree care or a formal written report, Javier Castaneda Jr. brings ISA Certified expertise to every consultation — and he's the one who shows up.