Tree Risk Assessment Report: Field Workflow and Checklist

A property manager sends three phone photos and asks:

Can you put in writing that this oak is dangerous so we can remove it?

The photos show a long limb over parking spaces, a dark opening in the trunk, and mushrooms near the base. They do not show the opposite side of the trunk, the root collar, the slope, the occupancy of the parking area, the ownership line, the utility conductors behind the crown, or what changed during the reported storm.

“Dangerous tree” is not a useful report.

A useful report says what assignment was accepted, who requested it, which tree was assessed, what people or property could be struck, what assessment method and time frame were used, what was observed, what could not be inspected, how the risk was analyzed, what mitigation options were considered, and what decision remains with the authorized owner or manager.

Start that record in a general inspection report. Use a site assessment checklist for access, utilities, grade, drainage, recent construction, adjacent property, and other site conditions. If the client later approves pruning, support work, or removal, price it in a separate tree service quote, carry the accepted scope into a tree service contract, and dispatch it through a tree service work order.

That separation matters. The report explains the assessment and recommendations. The quote explains the price. The work order records what the crew is authorized to do.

Define the assignment before you inspect the tree

“Look at the oak” is not an assignment.

The current ISA Basic Tree Risk Assessment Form instructions begin with the assessor, client, site-visit date, address or tree location, tools, species, tree number, dimensions, and assessment time frame. Those fields force a useful conversation before anyone assigns a rating.

Put these decisions in the appointment or scope record:

If the property has 40 trees but the agreement covers six trees along one parking lane, the report should not read as though the other 34 were inspected.

For a broader intake routine, the site-visit estimate checklist shows how to label conditions as reported, observed, assumed, or not inspected. That same discipline makes a tree report much harder to misread later.

Call the deliverable what it really is

An ordinary service observation, a tree inventory, a worksite inspection, and a tree risk assessment are not interchangeable.

The 2025 ISA form is intended for a basic (Level 2) tree risk assessment. ISA says limited visual (Level 1) and advanced (Level 3) assessments need different forms or data sheets. The instructions also say the basic form may support a written report or be attached to one, but the form alone is not intended to serve as the final report.

ANSI A300-2023 places tree risk assessment in Clause 13 of the consolidated tree-care standard. Name the method and standard that actually governed the assignment rather than borrowing a label from a different level of assessment.

That creates a simple office rule:

• If the shop is recording a customer complaint, visible condition, or work need without applying a recognized risk-assessment method, call it a condition report, service report, or inspection note.
• If a qualified assessor is performing a tree risk assessment, name the method and level, define the time frame and targets, and use the matching analysis and report requirements.
• If the basic assessment cannot support a reasoned conclusion, state that the data are preliminary and recommend the appropriate advanced assessment or specialist rather than filling the gap with confidence.

ISA describes its Tree Risk Assessment Qualification as a voluntary specialized qualification. TRAQ training covers a standardized process, limited-visual and basic assessment fundamentals, advanced diagnostic principles, information gathering, analysis, and mitigation recommendations. It is not a nationwide government license, and it is not a credential a company may imply that an unqualified employee holds.

Licensing is a separate question. Maryland DNR, for example, licenses tree experts and publishes duties involving qualifications, insurance, written scope, client information, compensation, signatures, and professional conduct. Connecticut DEEP requires an arborist license for defined arboriculture offered for hire. Other states and localities use different rules.

Before advertising or signing a tree-risk assignment, verify:

1. Which individual will perform and sign the assessment.
2. Which credentials or licenses that person actually holds.
3. Whether the state, city, utility, insurer, court, HOA, or permit office requires a particular qualification or report.
4. Whether the company's insurance covers the consulting service being offered.
5. Whether a separate consulting arborist, engineer, utility arborist, plant diagnostician, or other specialist is needed.

List each applicable credential or license under its correct name and number. Do not turn “tree service company” into “TRAQ-qualified assessor” by implication.

Give every tree a stable identity

“Large oak by the building” fails as soon as the property has two large oaks.

Use a stable tree ID that appears on the report, map, photos, recommendations, quote, and later work order. For a one-tree residential property, that can be T-01. For an apartment complex, combine the property map with a simple series such as A-01 through A-18.

Record:

• street address and a plain-language location;
• map pin, sketch, GPS coordinate, inventory tag, or another reproducible locator;
• common and scientific species when reasonably identified;
• trunk diameter and the measurement height or method;
• height and crown spread, labeled measured or estimated;
• multiple stems, notable form, and a stable orientation reference, such as north;
• assessor, date, time, weather, tools, and who accompanied the visit;
• photo IDs tied to the same tree number.

Do not quietly convert an estimate into a measurement. “Height approximately 65 feet, visually estimated from ground” is more defensible than “height 65 feet” when no measurement was taken.

On a managed property, include a one-page map. A property manager should be able to hand the report to a different arborist six months later and point to the same tree without a phone call.

Name the target instead of writing “near property”

A crack, dead branch, cavity, or root concern does not complete the risk analysis by itself. The current ISA form pairs a possible failure with a specific target: people, structures, vehicles, or activities that could be injured, damaged, or disrupted.

Write the actual target:

Then record the target's position and occupancy for the stated time frame. A movable picnic table is a different management problem from an occupied bedroom. A parking space that can be closed is different from a public road. A target that is almost never occupied is different from a daycare play area.

The report should make those facts visible while keeping the roles clear. The manager supplies use patterns; the assessor documents and analyzes the target under the selected methodology.

For multi-tree work, do not reuse one generic target line for every tree. T-03 may affect the building entrance; T-04 may affect an unused slope; T-05 may affect a neighboring garage. The target is part of each tree-part scenario, not a property-wide slogan.

Separate reported history, observed condition, and analysis

One of the cleanest report improvements is to stop blending what the customer said with what the assessor saw.

Use three lanes:

Do not write “storm-damaged tree” when the only evidence is a customer statement and one old wound. Do not write “decay throughout trunk” when the observation is one fruiting body at the base and no advanced investigation. Do not write “roots destroyed” because soil was disturbed nearby.

Record observations by area:

• Site: grade, slope, drainage, soil change, trenching, paving, construction, recent clearing, wind exposure, irrigation, fill, erosion, and target use.
• Crown and branches: dead, broken or hanging branches, prior failures, cracks, weak attachments, overextension, load changes, support systems, pruning history, and visibility.
• Trunk: stems, lean, cracks, cavities, decay indicators, missing bark, response growth, lightning or impact evidence, and what could not be seen.
• Root collar, roots, and soil: visibility of the root collar, movement, decay indicators, cut roots, restricted rooting area, soil change, heaving, trenching, paving, and access limits.

The point is not to fill every box. ISA's instructions explicitly say not every line must be completed. The point is to collect the information relevant to the accepted assignment and explain the conditions that drove the analysis.

Build a photo set that another person can follow

A close-up of a cavity without a tree ID, orientation, or wider view is an interesting image, not a useful record.

Use a repeatable photo sequence:

1. Property overview or map context.
2. Whole tree from at least two useful directions.
3. Target and its relationship to the tree.
4. Crown or branch concern in context.
5. Trunk concern in context and detail.
6. Root collar, visible roots, and soil condition.
7. Recent site change, construction, grade, drainage, or access issue.
8. Inspection limitation: fence, vines, parked vehicle, buried root collar, dense foliage, weather, unsafe area, or blocked side.
9. Utility line or other stop condition from a safe position.
10. Any temporary target-control measure already in place.

Name photos with the tree ID and sequence, such as T04-P01 through T04-P10. In the report, write captions that state what the image shows and where it was taken. Use a scale only when it can be placed safely and does not imply measurement accuracy the method cannot support.

The broader photo requirements for work orders apply here too: preserve original files, connect each image to the job and tree, avoid unrelated private details, and record when an expected view could not be captured.

Photos do not cure a limited inspection. If ivy hides the trunk, mulch hides the root collar, a locked yard prevents access, or the crown cannot be seen safely, show and state the limitation.

Show the reasoning without turning the report into a mystery score

Under the ISA basic form, the analysis follows a chain:

1. Identify the tree part and failure type being evaluated.
2. Select the likelihood of failure within the stated time frame.
3. Identify the target and likelihood of impact.
4. Combine failure and impact through the method's likelihood matrix.
5. Evaluate consequences.
6. Use the risk matrix to determine the risk category.
7. Record the overall tree risk rating—the highest rating among the scenarios evaluated for that tree.

The current form uses defined categories rather than a homegrown 1-to-10 score. It also provides space for more than one failure scenario because a dead limb over a sidewalk and a root concern toward an empty field are not the same risk.

The customer-facing report does not need to reproduce every training note, but it should let a reader trace the conclusion:

Do not reverse-engineer a rating to sell the preferred job. Do not use “imminent,” “extreme,” or another defined term as a synonym for “I recommend removal.” If the assessment method, data, or assessor's qualifications do not support a category, refer the assignment instead of inventing one.

Turn recommendations into decisions, not vague warnings

“Recommend corrective action” does not tell the client what to approve.

Write each recommendation with:

• the tree and tree part;
• the management objective;
• the action or options;
• the priority or completion window;
• the target controls needed before work;
• the credential, permit, utility, owner, neighbor, or access prerequisite;
• the expected residual risk when the selected method supports that judgment;
• the reassessment interval or event trigger.

Possible risk-management options can include managing the target, pruning to a written objective, installing or inspecting a support system, obtaining advanced assessment, monitoring, correcting a site condition, removing the tree, or using a combination. The assessor should choose and explain appropriate options for the actual case.

Target management deserves its own line. Closing two parking spaces, moving a picnic table, restricting a path, or keeping occupants away from a storm-loaded area can be an immediate action while the owner arranges qualified work. It is not a substitute for permanent mitigation when the assessment calls for more.

Keep the report and price separate:

1. Deliver the signed report and photo appendix.
2. Let the client acknowledge receipt and choose which recommendation to price.
3. Prepare the tree service quote with method, access, utilities, permits, debris, cleanup, and exclusions.
4. Use the workflow in Tree Removal Quotes: Price the Method, Access, Utilities, and Cleanup when removal is one selected option.
5. Put any approved change in a change order before the crew changes method or scope.

A recommendation is not authorization to cut. A report signature should acknowledge delivery or an assessment discussion unless the document clearly and lawfully does more. Work authorization belongs in the accepted quote, contract, and work order.

Treat power lines and active storm conditions as stop points

A report deadline does not make an unsafe site inspectable.

Pause the routine visit and follow the company's emergency-response procedure when there are:

• downed, sagging, arcing, or contacted conductors;
• a tree or limb loaded against electrical equipment;
• active high wind, lightning, severe weather, fire, flooding, unstable soil, or other changing conditions;
• an actively moving root plate, suspended limb, split stem, or unsupported tree part near people;
• an uncontrolled road, pedestrian, building, or tenant exposure;
• access that would require climbing, aerial work, cutting, rigging, or disturbance outside the accepted assessment method;
• a structure, slope, utility, or tree condition requiring another specialist.

Ready.gov's thunderstorm guidance tells the public to watch for fallen power lines and trees and report them immediately. The office intake should route a downed-line call to the utility or emergency authority, keep people away, and avoid promising that an assessor will “take a quick look.”

If the same event damaged a roof, keep the tree assessment separate from the roofer's storm-damage roof inspection report. Record the handoff and any access restriction in both job files so neither trade is asked to make the other's technical conclusion.

OSHA's tree-care inspection guidance explains that workers can be electrocuted through contact by the worker, tools, equipment, or a limb. It also says the applicable electrical standard depends on the work and who performs it; some line-clearance work falls under 29 CFR 1910.269, while other tree work may fall under general-industry electrical or telecommunications standards.

OSHA's current 29 CFR 1910.269 definition of line-clearance tree trimming limits that section to clearing around electric-power lines or equipment on behalf of the organization that operates them or controls their operating procedures. Tree trimming performed for a homeowner or an ordinary commercial client—not for the line operator—falls outside that section, although other OSHA standards may still apply.

Do not turn that scope distinction into permission to approach a conductor. Record the utility condition from a safe location, treat lines as energized, identify the stop, and coordinate with the utility and properly qualified personnel.

When later work is approved, use a separate job hazard analysis. The report can identify a hazard; it does not replace the crew's pre-job assessment, briefing, equipment checks, traffic control, drop-zone plan, rescue preparation, or changing-condition stop authority.

Put every inspection limitation in plain English

The 2025 ISA form specifically provides for limitations involving visibility, access, vines, a buried root collar, and other factors. It also distinguishes final data from preliminary data and lets the assessor recommend advanced assessment when the available information is insufficient.

Use a limitation block such as:

Assessment was performed from accessible ground positions on [visit date]. No climbing, aerial lift, excavation, root-collar exposure, drilling, tomography, resistance testing, laboratory analysis, or removal of attached material was included. Dense ivy obscured the lower [height] of the north trunk; parked vehicles prevented viewing the southwest root area; the upper crown was partly obscured by adjacent trees. Findings and recommendations are limited to the stated assignment, observed conditions, available information, and [assessment time frame]. Reinspection is recommended by [date or interval], or sooner after significant storm loading, branch or root failure, construction, grade or drainage change, impact, or another material condition change.

Change that language to the actual visit. Never paste “no limitations” into a report when one side of the tree was behind a locked fence.

Avoid two opposite mistakes:

• The invisible disclaimer: burying every limitation in generic fine print while the body makes absolute claims.
• The empty disclaimer: writing “not responsible for anything” instead of identifying what was and was not inspected.

The useful report puts the limitation next to the affected finding, then summarizes limitations again near the recommendation.

Give property managers a one-page action tracker

A 30-page report can still fail if the manager cannot see which action belongs to which tree.

Add a summary table:

The tracker is a navigation aid, not a replacement for the analysis. Link every row to the tree page, photos, limitations, and recommendation.

For managed sites, also record:

• who received the report;
• who owns each tree or who must verify ownership;
• who can approve target restrictions;
• tenant, resident, employee, or public notice responsibility;
• permit, tree-warden, HOA, insurer, or utility coordination;
• quote requested, declined, pending, or referred;
• completion evidence and reassessment date.

If a recommendation crosses a property line or affects a public tree, stop at the ownership and permission boundary. Do not turn a manager's request into authority over a neighbor's or municipality's tree.

A compact report block the client can understand

The technical analysis belongs to the qualified assessor. The report structure can still be simple.

Assignment: Basic Level 2 tree risk assessment of T-04 for the property owner, covering the identified parking and building targets over the stated assessment time frame. Intended use is maintenance prioritization. Appraisal, engineering, aerial inspection, subsurface investigation, laboratory diagnosis, and work authorization are excluded.

Tree identity: T-04, species and dimensions recorded by the assessor, west parking island, mapped on Sheet M-01. Photos T04-P01 through T04-P12.

Targets: Six parking spaces, the adjacent pedestrian route, and the named building area, with use and occupancy documented for the assessment time frame.

Reported history: Manager reports a branch failure after the stated storm date. No injury or property damage was reported.

Observed condition: List the crown, branch, trunk, root-collar, root, soil, site, and prior-failure observations that the assessor actually documented. Keep unverified history separate.

Assessment: Identify each evaluated tree part and failure type, target, likelihood factors, consequence category, resulting risk category, and the evidence supporting the result under the chosen method.

Recommendation: List the selected mitigation option or options, target controls, completion window, prerequisites, expected residual risk when assessed, and reassessment interval.

Limitations: Identify blocked views, inaccessible areas, obscured root collar, excluded tools or methods, preliminary data, and any advanced assessment or specialist referral.

Client decision: Report received; target-control decision recorded; quote requested, declined, pending, or referred. This acknowledgment does not authorize tree work unless a separate accepted document says so.

That block gives the owner a decision path and gives the next contractor a reliable starting point.

Keep the report connected to the whole job file

The tree file should include:

1. Client request and accepted assessment scope.
2. Assessor credential and license information relevant to the assignment.
3. Site map and tree inventory IDs.
4. Field form, notes, measurements, and tool list.
5. Original photos and the labeled photo appendix.
6. Weather, storm, construction, permit, utility, or prior-service records actually relied on.
7. Signed report, recommendations, limitations, and reassessment date.
8. Client delivery and acknowledgment.
9. Separate quote, contract, and work order for approved mitigation.
10. Crew change orders, completion photos, and completion sign-off.
11. Final invoice, payment record, and future inspection reminder.

The federal E-SIGN Act, 15 U.S.C. § 7001 generally prevents a record or signature in a covered transaction from being denied legal effect solely because it is electronic. It does not erase state licensing, consumer-disclosure and consent, record-retention, permit, or contract requirements. Use a record the parties can retain and reproduce, identify what each signature means, and give the client a copy.

IRS Publication 583 explains that business records and supporting documents should show transactions, income, and expenses. Keep the assessment agreement, report, quote, invoice, and payment support together under the same job identifier instead of leaving the technical record in one inbox and the financial record in another.

Final check before delivering the report

1. The client, decision authority, property, intended use, and assignment are explicit.
2. The assessment method, level, time frame, and exclusions are named accurately.
3. The assessor's actual credentials and licenses are shown without implication or exaggeration.
4. Every assessed tree has a stable ID and reproducible location.
5. Every evaluated scenario identifies the tree part, failure type, and specific target.
6. Reported history is separate from field observation and analysis.
7. Measurements and estimates are labeled correctly.
8. Site, crown, branch, trunk, root-collar, root, and soil observations relevant to the assignment are recorded.
9. Photos connect overview, target, condition, detail, orientation, and limitation.
10. Risk categories follow the stated methodology rather than a homegrown score.
11. Recommendations identify action, timing, prerequisites, residual risk when assessed, and reassessment.
12. Unsafe utility, storm, access, traffic, and structural conditions have clear stop and referral paths.
13. Inspection limitations are specific and placed next to affected findings.
14. The action tracker matches the detailed tree pages.
15. Report acknowledgment is separate from work authorization.
16. Approved mitigation moves into a quote, contract, work order, and crew safety plan.
17. The delivered report, photos, approvals, completion records, and invoice stay under one job ID.

Sources

Sources checked July 21, 2026.

• International Society of Arboriculture, Using the ISA Basic Tree Risk Assessment Form, 2025, for Level 2 scope, assignment and tree identity, targets, site and tree observations, likelihood and consequence analysis, risk categories, mitigation, residual risk, inspection limitations, preliminary data, advanced-assessment referral, and reassessment fields
• International Society of Arboriculture, ISA Tree Risk Assessment Qualification, for the voluntary qualification's purpose, eligibility, training, assessment, methodology, and credential scope
• International Society of Arboriculture, New Tree Risk Assessment Manual Now Available, November 10, 2025, for the third-edition manual's current terminology, assessment levels, site and tree risk factors, advanced techniques, mitigation, reporting, role clarity, and updated case-study context
• Tree Care Industry Association, ANSI A300 Tree Care Standards, for ANSI A300-2023's consolidated tree-care scope, Clause 13 tree risk assessment, and work-specification context
• Occupational Safety and Health Administration, Inspection Guidance for Tree Care and Tree Removal Operations, June 30, 2021, for tree-care electrical, fall, struck-by, machinery, tool, PPE, first-aid, and changing-work-condition enforcement context
• Occupational Safety and Health Administration, 29 CFR 1910.269, Electric Power Generation, Transmission, and Distribution, for the current definition and scope of line-clearance tree trimming, electrical-hazard controls, and adverse-weather provisions
• Ready.gov, Thunderstorms & Lightning, updated July 10, 2025, for public guidance on active thunderstorms, fallen trees, fallen power lines, reporting, and keeping clear of post-storm hazards
• Maryland Department of Natural Resources, Licensed Tree Experts, for a state-specific example of tree-expert licensing, qualifications, insurance, professional conduct, written scope, client information, compensation, signatures, access, and ANSI-related duties
• Connecticut Department of Energy and Environmental Protection, Commercial Arborist License, accessed July 21, 2026, for a different state-specific example of arborist licensing, business registration, examination, safety, records, electrical-hazard knowledge, and regulated arboriculture
• Office of the Law Revision Counsel, U.S. House of Representatives, 15 U.S.C. 7001, General Rule of Validity, for the federal baseline on legal effect of electronic records and signatures in covered transactions
• Internal Revenue Service, Publication 583, Starting a Business and Keeping Records, revised December 2024, for general small-business transaction, invoice, expense, and supporting-document recordkeeping

This article is for general information, not arboricultural, legal, licensing, engineering, insurance, tax, electrical, emergency-response, or workplace-safety advice. Tree risk assessment requires qualified professional judgment. Verify the assignment, assessor qualifications, state and local licensing, ownership, access, utilities, permits, assessment method, report use, target controls, worker protections, and mitigation with the responsible agencies and qualified professionals before acting.