ISA Member Arborist Credentials — Verify Our Qualifications
Before hiring any tree company in Denver, verify their credentials. Tree Service Denver LLC holds ISA Member Arborist certification, EHAP electrical safety certification, $1M general liability insurance, workers’ compensation coverage, and Colorado business registration. This page documents every credential — because you should always ask.
What Credentials Does Tree Service Denver LLC Hold?
Tree Service Denver LLC operates under ISA Member Arborist credentials held by lead arborist Eric Petruska, carries $1M general liability insurance plus workers’ compensation, and performs all work to ANSI A300 pruning standards and ANSI Z133 safety standards. ISA membership is the tree care industry’s benchmark credential, requiring verified field experience, a proctored examination, and continuing education to maintain. Proof of insurance is provided on request before any job begins.
Our Credentials — Documented
ISA Member Arborist credential held by owner Eric Petruska through the International Society of Arboriculture (ISA). ISA membership is the tree care industry’s most recognized professional credential, requiring passage of a 200-question exam covering tree biology, diagnosis, soil science, pruning, risk assessment, and cabling. Certification requires ongoing continuing education to maintain. Verify any ISA credential at isa-arbor.com/credentials using the arborist’s name.
EHAP certification covers safe work practices near energized electrical infrastructure, including minimum approach distances, electrical hazard identification, and safe rigging near utility lines. This credential is required by OSHA for tree workers operating within the minimum approach distance of energized conductors. Most tree companies in Denver dispatch crews near power lines without EHAP certification — a significant safety and liability risk.
Tree Service Denver LLC carries $1,000,000 in general liability insurance underwritten by a Colorado-licensed carrier. This coverage protects your property against any damage caused during tree work. Always request a Certificate of Insurance (COI) before any tree company begins work on your property — any legitimate contractor will provide one immediately. Call (720) 807-2785 and we will email your COI before your job is scheduled.
All field crew members are covered by workers’ compensation insurance. Workers’ comp is legally required in Colorado for any company with employees. If a tree company without workers’ comp sends an uninsured crew member onto your property and that worker is injured, the property owner can be held liable. Always verify workers’ comp alongside liability insurance before any tree work begins.
Tree Service Denver LLC is a registered Colorado Limited Liability Company in good standing with the Colorado Secretary of State. Verify business registration at sos.state.co.us by searching “Tree Service Denver LLC.” Hiring an unregistered business creates significant legal and tax exposure for homeowners in the event of a dispute or injury.
All pruning work at Tree Service Denver LLC follows ANSI A300 — the American National Standard for Tree Care Operations. ANSI A300 defines proper cut placement, crown reduction ratios, pruning objectives, and prohibited practices like topping. Following ANSI A300 standards is what separates professional arboricultural care from tree butchery. We never top trees.
What to Ask Every Tree Company in Denver
Are you ISA-member?
Ask for the arborist’s ISA Member Arborist number and verify it at isa-arbor.com. Many companies claim to employ certified arborists but won’t provide a credential number on request — that’s a red flag. At Tree Service Denver LLC, Eric Petruska’s ISA credential is available on request.
Can you provide a Certificate of Insurance?
Any legitimate tree company will email a current Certificate of Insurance (COI) before work begins. The COI should show at least $1M in general liability coverage and workers’ compensation. If a company hesitates or can’t provide a COI quickly, do not allow them to work on your property. Tree Service Denver LLC provides COI on request — call (720) 807-2785.
Do you carry workers’ compensation?
Workers’ comp is legally required in Colorado for companies with employees. Without it, an injured crew member on your property can result in a homeowner liability claim. Always verify workers’ comp is on the COI — it should be listed separately from general liability.
Will you provide a written estimate?
Never allow tree work to begin without a written estimate documenting the scope of work and price. Verbal estimates create disputes. Tree Service Denver LLC provides free written estimates on every job before any work begins — no exceptions.
Can I verify your ISA membership myself?
The Standards, Explained in Plain English
ANSI A300 is the American National Standard for tree care operations — it defines what a correct pruning cut is, how much live canopy can be removed, and what practices (like topping) are prohibited because they injure trees. ANSI Z133 is the safety standard for arboriculture — it governs climbing, rigging, chainsaw handling, drop zones, and work near energized lines. ISA membership is the credential verifying the person applying those standards actually understands tree biology and risk. Together they’re the difference between pruning that strengthens a tree and cutting that slowly kills it.
Why the Insurance Details Matter to You
Tree work is one of the most dangerous trades in America, and homeowners are exposed when an uninsured crew gets hurt or drops a limb on a structure — your homeowner’s policy can end up holding the bag. We carry $1M in general liability plus workers’ compensation on every crew member, and we provide certificates of insurance before work starts, including additional-insured certificates for HOAs and commercial clients. If a bid you’re comparing doesn’t come with proof of insurance, it isn’t a lower price — it’s a transferred risk.
How to Verify Any Arborist’s Credentials
Don’t take any company’s word for it, including ours: the ISA maintains a public credential-verification tool where you can confirm any certified arborist by name. Ask for the certificate of insurance directly from the insurer, not a photocopy. And ask who specifically will assess your trees — at Tree Service Denver LLC that’s Eric Petruska, on every single job, backed by 164 reviews. Ready to put the credentials to work? Get a free estimate.
Credential Red Flags to Watch For
Colorado has no statewide tree-contractor license, which means anyone with a chainsaw can print “licensed & insured” on a door magnet. Watch for: “licensed” claims with no license number or issuing body named; insurance “available on request” that never arrives; door-knockers after storms demanding cash deposits; bids dramatically below market (see what removal actually costs); and companies that recommend topping — a practice ANSI A300 prohibits because it ruins trees. The pattern behind every red flag is the same: no verifiable credential, no verifiable insurance, no accountable name. The fix is equally simple — verify the arborist, verify the COI, and read the review history.
Credentials Aren’t a Trophy — They’re Maintenance
ISA membership expires without continuing education, and that’s the point: arboriculture keeps moving. Pest fronts shift — emerald ash borer’s arrival rewrote ash management across the Front Range. Standards evolve — A300 revisions have tightened what a correct structural cut is. Climate stress is changing which species make sense to plant (our Colorado guide reflects that). Maintaining the credential means the person assessing your trees is current on all of it, not working from what was true in 2011. When you hire certified, you’re not buying a certificate — you’re buying the obligation to stay correct.
Credentials at a Glance
- Certification: ISA Member Arborist — exam, verified experience, continuing education
- Insurance: $1M general liability; workers’ compensation on all crew
- Standards: ANSI A300 (tree care) & ANSI Z133 (safety) on every job
- Verification: ISA public lookup + COI direct from insurer, before work begins
Print this list and hand it to any company bidding your work — every line is a yes-or-no question, and a professional outfit answers all four in writing without hesitation.
Request Our Certificate of Insurance
COI available before any work begins. ISA credential number available on request. Call or email anytime.