Tree Service Workers' Compensation: Class Code 0106 and Why This Class Is So Hard to Place

Tree service is one of the hardest classes in workers' compensation to place, and the reason is severity rather than frequency. Tree workers experience roughly one fatality for every 14 non-fatal injuries, against about one per 350 across all industries. The class code, 0106, sits in NCCI Hazard Group F, second from the top of a seven-level scale. A book of tree accounts produces catastrophic claims at a rate no ordinary contracting class does, and carriers price and decline accordingly.

Will we write it? Tell us the operation, the state, and roughly where the mod sits — we'll come back within one business day with a straight answer: yes, no, or what we'd need to see. No ACORD, no loss runs, no obligation. Agents and business owners both welcome. Run it past us here.

What Code 0106 Covers

The NCCI phraseology is Tree Pruning, Spraying, Repairing - All Operations & Drivers. It is applied by job site rather than by employee, and it captures the whole contract including chipping and cleanup, plus incidental tree removal on a developed site done in connection with pruning. Independent state bureaus draw the lines differently, and those differences matter. New York, for example, uses Tree Pruning, Repairing or Trimming - All Operations to Completion & Drivers, and separately routes tree spraying to 0042, stump removal to 6217, and utility right-of-way line clearance to 7538 or 7601. Confirm the boundaries in the specific state before assuming a national rule.

California Classifies on Elevation, and the Ground Crew Goes With the Job

California's Code 0106 reads Tree Pruning, Repairing or Trimming - N.O.C. - hand or mechanical power - including ground crews and shop, yard or storage operations. The classification applies when any portion of the operations requires elevation, including ladders, lifts or climbing.

Read that phrasing carefully, because it settles the most common California audit dispute in this class. The test is per job or location, not per employee, and ground crews are named in the classification itself. If any part of the job required a climber or a bucket, the entire crew on that job is 0106, including the people who never left the ground. Debris cleanup, chipping, stump grinding and tree spraying performed in connection with the pruning work all ride along. Tree removal is included where the trees retain no commercial timber value. Commercial timber harvesting moves to logging, and land clearing moves to a separate land clearing classification. Where no part of the work at a job requires elevation, the work falls back to 0042 Landscape Gardening.

What Is Actually Killing Tree Workers

The Tree Care Industry Association's census of 243 deaths between 2020 and 2023, roughly 61 per year, breaks down as struck-by 93 cases, falls 50, electrical contact 37, and caught in or between 31. Within struck-by, 50 involved the tree itself and 35 a limb. Within falls, 26 were from trees and 19 from aerial lifts. Within caught-in, brush chippers account for seven.

Published fatality rates for this work vary widely depending on the denominator used, and it is worth being precise rather than quoting the scariest number. Against the BLS occupational category of tree trimmers and pruners, the rate runs around 110 per 100,000. OSHA has estimated roughly one in 1,000 tree trimmers. TCIA, using a broader industry headcount of 150,000 to 200,000 workers, puts it between 30 and 41 per 100,000. The all-industry baseline is about 3.4 to 3.8. Even the most conservative of those figures is roughly ten times the national average. Non-fatal injuries run around 239 per 10,000 tree workers against 89 per 10,000 across all industries, and soft-tissue sprains and strains make up about a third of non-fatal claims. TCIA also reports that more than two-thirds of fatalities involve workers with less than one year of experience, which is why onboarding structure is a live underwriting question rather than a formality.

There Is No Dedicated OSHA Tree Care Standard

This is a genuine complication for both operators and underwriters. OSHA regulates tree work through a patchwork of general industry standards covering walking and working surfaces, personal protective equipment, aerial devices, fall protection, electrical safety, powered hand tools, cranes, machine guarding and noise, backed by the General Duty Clause where no specific standard applies. A dedicated tree care standard has been in rulemaking for years and remains at the proposed stage.

In practice the industry benchmark is ANSI Z133, the arboricultural operations safety standard for which ISA serves as secretariat. It covers electrical hazards, aerial devices, chippers, stump grinders, cranes, chain saws, climbing and rigging, and it carries the governing doctrine that all overhead conductors shall be considered energized with potentially fatal voltages. Z133 conformance is a strong underwriting credit signal. It is not a legal shield: OSHA has stated plainly that reliance on the ANSI standard is not a defense to violating an actual OSHA requirement, and has specifically flagged that the crane standard prohibits riding the hook, a practice still common in the trade.

Line Clearance and the Qualified Arborist Distinction

OSHA defines line-clearance tree trimming as work near, meaning within 10 feet of, energized power lines. An unqualified worker must maintain that 10-foot minimum approach distance at 50 kV and below, increasing by four inches for every additional 10 kV. A qualified line-clearance tree trimmer works under 1910.269 with much shorter approach distances, must be trained and certified in safety-related work practices, and must be observed at least annually to be complying with them. That annual observation record is an auditable artifact and worth asking for by name. A second trimmer must be within voice range when approaching within 10 feet of conductors energized above 750 volts.

The underwriting consequence is straightforward. A tree company that performs no line-clearance work at all is a materially different risk from one whose crews do incidental line work without 1910.269 qualification. The second version is where electrocution fatalities come from, and it is a common reason an otherwise reasonable account cannot be placed.

What Separates a Writable Tree Account From a Declined One

Accounts that get written tend to be bucket and aerial-lift dominant with limited climbing, weighted toward pruning and maintenance rather than removals, doing no line-clearance work or using fully qualified crews, with all climbers on payroll and subcontractors carrying their own coverage with certificates on file. Credentials matter more here than in most classes: TCIA Accreditation, an ISA Certified Arborist on staff, and a Certified Treecare Safety Professional designation are all recognised credits, as are documented drug testing, MVR screening and a written fleet program.

Accounts that get declined tend to be climber-heavy with no aerial rescue program, weighted toward removals and storm chasing, using subcontracted climbers or 1099 crews with certificate gaps, or carrying undisclosed crane exposure. The single most telling question on a tree submission is whether the ground crew is trained and drilled in aerial rescue, because a climber who is aloft and unconscious cannot be rescued by people who have never practised it. One more practical warning: underwriters read the website. A storm-response or crane page that does not appear on the application is a common cause of declination.

Why the Experience Mod Hits Tree Companies Twice as Hard

An experience mod above 1.25 will disqualify a tree account from most preferred markets outright. Two structural factors make that threshold easy to cross. First, the rating plan weights frequency over severity, so the chronic sprain and strain claims that make up a third of tree losses drive the mod hard while the catastrophic claims drive the underwriting decision. Second, tree companies are typically small, often five to fifty employees, so expected losses are small and a single serious claim can push the mod above 1.00 and hold it there for the full three-year experience period.

Then the multiplier compounds. Because 0106 carries one of the highest manual rates in the book, a debit mod applied to that base costs multiples of what the same mod costs a contractor in a low-rated class. And a high mod does damage beyond insurance: utility vegetation-management contracts, municipal bids and contractor prequalification platforms commonly gate on it, so a bad mod can cost a tree company its revenue base at the same moment it costs it its market.

One correction worth making, because it circulates widely: statutory workers' compensation is generally not a surplus lines product. Federal law expressly preserves state restrictions on placing workers' comp with non-admitted insurers, and most states prohibit it. A tree account that falls out of the standard market goes to a specialty admitted carrier, a PEO or master-policy program, a group captive, the assigned risk plan, or a state fund. Surplus lines participates in excess workers' comp and employers' liability, not statutory coverage.

How CPR Places Tree Service Accounts

CPR Business Solutions places tree care accounts that standard markets decline, including elevated mods, prior severity claims and operations coming off a non-renewal. Start the submission earlier than you would for an ordinary class: five years of currently valued loss runs rather than three, the mod worksheet, payroll split by class code, equipment and vehicle schedules, subcontractor agreements and certificates, and the safety and training documentation including aerial rescue drills and any ISA, CTSP or TCIA credentials. Send it over and we will tell you within 24 hours which route fits.

Frequently Asked Questions

Does the ground crew get classified separately from the climbers?

In California, no. Code 0106 names ground crews in the classification itself, and the elevation test applies per job or location rather than per employee. If any portion of the work at that job required a ladder, lift or climbing, the entire crew including ground personnel is classified 0106. This is the most common California audit dispute in the class.

What experience mod will disqualify a tree service from the standard market?

A mod above 1.25 will disqualify most tree accounts from preferred markets. Because tree companies are usually small, expected losses are low, so one serious claim can push the mod past that threshold and keep it there for the full three-year experience period.

How close to a power line can an unqualified tree worker work?

An unqualified worker must stay at least 10 feet from lines energized at 50 kV or below, and that distance increases by four inches for every additional 10 kV. Work inside 10 feet is line-clearance tree trimming and requires a qualified line-clearance arborist working under OSHA 1910.269, with annual observation of compliance and a second trimmer within voice range above 750 volts.

Can tree service workers' comp be written in the surplus lines market?

Generally no. Statutory workers' compensation is not a surplus lines product in most states, and federal law preserves those state restrictions. A tree account outside the standard market goes to a specialty admitted carrier, a PEO or master-policy program, a group captive, the assigned risk plan, or a state fund. Surplus lines participates in excess comp and employers' liability, not statutory coverage.

Tree work frequently sits alongside landscaping exposure on the same account. Our landscaping workers' comp guide covers the 0042 side of that split, and our high experience mod placement guide covers what to do when the mod is the obstacle. Call 714-928-3858 or email proposals@cprbrokers.com to discuss a specific account.