Top 29 environmental services companies in Washington State (2026 list)

This selection of companies in Washington State primarily consists of large public sector entities and environmental services firms. Notable examples include the City of Seattle, which provides diverse public services, and King County, WA, a major employer offering essential government services. Other significant organizations are the Washington State Department of Ecology, dedicated to environmental protection, and Washington River Protection Solutions (WRPS), focused on managing radioactive waste. Additionally, Snohomish County PUD provides electric utility services.

The data shows a strong presence of government administration, with many companies headquartered in Seattle. Beyond the public sector, a significant portion of the companies are involved in environmental services, such as Anchor QEA, an environmental science and engineering consulting firm, and Central Plateau Cleanup Company, which specializes in nuclear waste cleanup. Tidal Vision, founded in 2015, focuses on biotechnology research for water treatment and sustainable materials.

#	Company	Industry	Headquarters	Employees	Founded
1	City of Seattle seattle.gov Providing diverse public services across multiple departments to support community well-being, infrastructure, and inclusive city development.	Government Administration	🇺🇸 Seattle	10,924	n/a
2	King County, WA kingcounty.gov A leading Washington employer, transforming government operations to provide essential services to over 2 million residents #GoPublic	Government Administration	🇺🇸 Seattle	8,009	1852
3	City of Tacoma tacoma.gov Mid-sized urban port city offering diverse cultural attractions, affordable housing, and a vibrant community of artists and entrepreneurs.	Government Administration	🇺🇸 Tacoma	2,037	n/a
4	Washington State Department of Ecology ecology.wa.gov An environmental protection agency in Washington dedicated to preserving and enhancing the state's land, air, and water for current and future generations	Environmental Services	🇺🇸 Lacey	1,450	1970
5	Washington River Protection Solutions (WRPS)wrpslegacy.com A company focused on reducing environmental risk by transferring radioactive and chemical waste from aging tanks to newer storage tanks safely and innovatively	Environmental Services	🇺🇸 Richland	959	2008
6	Snohomish County PUD snopud.com providing electric utility services to over 875,000 residents and businesses across Snohomish County and Camano Island, maintaining extensive distribution infrastructure	Utilities	🇺🇸 Everett	837	1949
7	Hanford Mission Integration Solutions hmis.hanford.gov HMIS team provides integration solutions for the Hanford mission, focusing on safety, efficiency, cost savings, collaboration, and community value	Government Administration	🇺🇸 Richland	689	2021
8	City of Vancouver, Washington cityofvancouver.us Managing municipal operations and community services on the north bank of the Columbia River while providing recreational opportunities within a metropolitan setting.	Government Administration	🇺🇸 Vancouver	684	1857
9	Chelan County PUD flow.page The company delivers clean, renewable, low-cost energy to local residents and utilities in the Pacific Northwest through hydro projects	Utilities	🇺🇸 Wenatchee	632	1936
10	Seattle Public Utilities seattle.gov The company partners with the community to manage water and waste resources equitably, promoting a healthy environment and economy for future generations	Government Administration	🇺🇸 Seattle	625	n/a
11	City of Bellingham cob.org A municipality in the northwest corner of the US providing quality public services, promoting sustainability, equity, and community engagement in Bellingham	Government Administration	🇺🇸 Bellingham	530	1903
12	Anchor QEA anchorqea.com An environmental science and engineering consulting firm specializing in aquatic, shoreline, and water resource projects, providing services nationwide	Environmental Services	🇺🇸 Seattle	526	1997
13	King County Department of Natural Resources and Parks kingcounty.gov The company works to support sustainable communities and protect the environment through regional parks, water protection, waste management, and environmental stewardship	Utilities	🇺🇸 Seattle	516	1958
14	Central Plateau Cleanup Company cpcco.hanford.gov The company is a major player in nuclear waste cleanup, boasting extensive experience and a track record of decommissioning facilities and handling waste	Environmental Services	🇺🇸 Richland	499	2021
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15	Tidal Vision tidalvision.com Extracts and formulates chitosan biopolymers for water treatment coagulants, specialized agriculture plant nutrition, crop protection, and high-performance sustainable material science solutions.	Biotechnology Research	🇺🇸 Bellingham	378	2015
16	Cascade Environmental, LLC cascade-env.com A leading provider of environmental and geotechnical drilling, site investigation, and remediation services nationwide, with a focus on collaboration, quality, safety, and sustainability	Environmental Services	🇺🇸 Bothell	372	1991
17	City of Olympia olympiawa.gov Municipal government in Olympia, Washington, managing city operations with a Council-Manager structure and oversight from a seven-member City Council	Government Administration	🇺🇸 Olympia	367	n/a
18	City of Auburn (Washington)auburnwa.gov The company promotes Auburn, WA as a thriving business and educational hub, with access to outdoor activities, parks, schools, and community events	Government Administration	🇺🇸 Auburn	342	1891
19	City of Lynnwood lynnwoodwa.gov A municipality nestled between the Olympic and Cascade Mountains, offering diverse activities, park land, trails, a recreation center, and preparing for transportation expansion	Government Administration	🇺🇸 Lynnwood	338	1959
20	City of Richland richlandwa.gov The City of Richland in Washington offers full-service amenities including police, fire, utilities, planning, parks, recreation, streets, and library services	Government Administration	🇺🇸 Richland	323	1958
21	Global Diving & Salvage, Inc.gdiving.com A leading marine services company with expertise in managing complex projects, offering safe marine construction, commercial diving, casualty response, and environmental services	Maritime Transportation	🇺🇸 Seattle	272	1979
22	Pacific Northern Environmental LLC pneco.com A company specializing in construction, industrial and commercial electrical services, environmental solutions, and global customer-focused solutions with ethical business practices and strategic growth initiatives	Construction	🇺🇸 Longview	247	1989
23	CH2M HILL Plateau Remediation Company (CHPRC)chprc.hanford.gov A subsidiary dedicated to safe environmental cleanup at the US Department of Energy's Hanford Site, reducing risk and supporting cleanup priorities	Environmental Services	🇺🇸 Richland	205	2008
24	Landau Associates landauinc.com Employee-owned environmental consulting firm providing services in air, noise, water, permitting, remediation, and design in the Pacific Northwest and Gulf Coast regions Emphasis on client collaboration and high-quality results	Environmental Services	🇺🇸 Seattle	186	1982
25	Goodwill Industries of the Inland Northwest discovergoodwill.org This company in the Inland Northwest helps individuals in need through social service programs, funded by selling donated goods to reduce waste	Civic and Social Organizations	🇺🇸 Spokane	182	1939
26	Veolia \| Nuclear Solutions - Federal Services vnsfederalservices.com Specializing in nuclear, waste management, and infrastructure solutions, providing innovative technologies, engineering, waste operations, and analytical services to the industry	Environmental Services	🇺🇸 Richland	111	2017
27	Alderwood Water & Wastewater District awwd.com Providing clean and reliable water and wastewater services to promote a healthy community, emphasizing sustainability and long-term access to water resources	Utilities	🇺🇸 Lynnwood	91	n/a
28	Sammamish Plateau Water spwater.org The company provides clean, reliable drinking water and sewer services to over 63,000 residents, with a focus on planning for the future	Utilities	🇺🇸 Sammamish	31	1948
29	Covington Water District covingtonwater.com This company provides high-quality water, prioritizing customer service, strategic planning, fiscal responsibility, regulatory compliance, stewardship, and partnerships	Utilities	🇺🇸 Covington	19	1960

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Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.

Top 29 environmental services companies in Washington State

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