blooming flowers climber in tree to prune beneficial mushrooms close up of lady bug on leaf japanese maple being pruned
Expert Staff
Awards & Affiliations
Community Involvement


We take pride in the work we do that benefits our clients and the community. Below are some of the awards we've received over the years for exceptional service.

Pacific Northwest Pollution Prevention Resource Center (PPRC) Eco-Logical Business Program

2012 — Eco-Biz Landscape Services Certification

The Landscape Services Eco-Logical Business Program is a certification that recognizes landscape design, installation and maintenance service contractors that reach the highest standards in environmental protection. It is the first program of its kind in the nation.The voluntary program is administered by the Pollution Prevention Outreach Team, a Portland metro area multi-agency group. �To be certified, a business must go beyond state and local requirements for pollution prevention, completing a rigorous 159 point checklist.� explains Debra Taevs, Oregon Director of the Pacific Northwest Pollution Prevention Resource Center (PPRC).

Eco-Biz logo for Landscape Services

Oregon Urban Trees and the Oregon Department of Forestry

2009 — State Urban Forestry Award

Terrill Collier, president of Collier Arbor Care, received the award in the professional category for his long time support of urban tree care. Jointly hosted by Oregon Urban Trees and the Oregon Department of Forestry, Collier was recognized for his efforts as a member of the Portland Urban Forestry Commission, his support for Friends of Trees and other activities on behalf of a healthy and growing urban tree canopy.

OR community of trees logo

Clackamas County Recycle at Work Program

2008 — Distinguished Business Recycling Awards Group (BRAG) Membership

Distinguished BRAG memberships go to high-achieving Clackamas County area businesses that recycle all curbside materials regularly, prevent waste with at least six ongoing activities, consistently buy recycled paper and other recycled products and demonstrate a commitment to continuous improvement.

Oregon State University Austin Family Business Award

2006 — Excellence in Family Business Award

Collier Arbor Care received the award in the category of Small Business (25 or fewer employees). An outside panel of nine judges evaluated entrants based on professional leadership with high standards for quality, safety and training; accessible management that includes employees at annual meetings, well developed estate and succession planning and active stewardship of the environment.

Collier Family recieving Austin Family Business Award

Oak Ridge Estates

2005 — Award of Distinction

Awarded by the National Arborist Association's Excellence in Arboricluture for work done to prevent large branch failures after the 250-year old tree was damaged in a winter storm. The work required extensive cabling, crown thinning and branch de-weighting.

Oak tree in Oak Ridge Estates after extensive pruning

Signature Oak at the Oregon Garden

2004 — TCIA Heritage Tree Maintenance Excellence in Arboriculture Award

Awarded by the Tree Care Industry Association (TCIA) for Collier Arbor Care's pro-bono community service work on the 400-year-old Oregon White Oak, the signature oak at the Oregon Garden in Silverton, Oregon.

In addition to cabling and pruning dead branches from the tree’s crown, Collier Arbor Care treated the tree organically to help control an infestation of oak pit scale and did soil and leaf tissue tests to determine nutrient levels and identify any deficiencies.

The Signature Oak Tree at the Oregon Garden

Perry Center for Children

2001 — Award of Distinction

Awarded by the National Arborist Association ’s Excellence in Arboricluture for work done to correct some hazardous conditions at the S.E. Portland location.

The pro-bono work included removal of a dead and dangerous maple tree, and the pruning of three large oaks with dead branches and limbs dangling over the parking lot.

Perry Center Tree

Vancouver Historic "Old Apple Tree"

2001 — Award of Distinction

Reacting to a request from the Vancouver Urban Forestry Program after a bad storm, crews from Collier Arbor Care pruned the tree twice yearly, changing its lop sided appearance by pruning back long branches, thinning and selecting new branches to be kept, and deweighting the side to slowly restore its shape.

Historic Apple Tree in Vancouver

Tree Care Industry Logo

Collier Arbor Care earned re-accreditation in March, 2008 from the Tree Care Industry Association (TCIA) after an in-depth examination of a range of its professional practices.

Accredited companies undergo an annual renewal check-up. Every three years, they must apply for re-accreditation and undergo a more thorough analysis.


Being actively engaged in the professional arborist community is important to us. Here is a list of organizations with whom we are associated.

Tree Care Industry Association

International Society of Arboriculture

American Society of Consulting Arborists

Oregon Association of Nurseries

Professional Land Care Network

Friends of Trees

Oregon Landscape Contractors Association


Tour des Trees

OSU Extension Service

Pacific NW International Society of Arboriculture

Better Business Bureau

Hoyt Arboretum

World Forestry Center


Arbor Links

Below are some helpful links related to the tree care industry.

Trees Are Good

Tree Care Tips

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