# Top 29 environmental services companies in Washington State

Tamtam tracks 29 environmental services companies headquartered in Washington State. This list ranks all of them by number of employees on LinkedIn, led by City of Seattle, King County, WA and City of Tacoma. Their median headcount is 378. Half of them were founded in 1970 or later. The most common headquarters are Seattle (7), Richland (6) and Bellingham (2).

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.

🇺🇸 Washington State · 29 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [City of Seattle](https://www.tamtam.ai/c/city-of-seattle) (seattle.gov)<br>Providing diverse public services across multiple departments to support community well-being, infrastructure, and inclusive city development. | Government Administration | 🇺🇸 Seattle | 10,924 |  |
| 2 | [King County, WA](https://www.tamtam.ai/c/king-county-wa) (kingcounty.gov)<br>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](https://www.tamtam.ai/c/city-of-tacoma) (tacoma.gov)<br>Mid-sized urban port city offering diverse cultural attractions, affordable housing, and a vibrant community of artists and entrepreneurs. | Government Administration | 🇺🇸 Tacoma | 2,037 |  |
| 4 | [Washington State Department of Ecology](https://www.tamtam.ai/c/washington-state-department-of-ecology) (ecology.wa.gov)<br>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)](https://www.tamtam.ai/c/washington-river-protection-solutions-wrps) (wrpslegacy.com)<br>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](https://www.tamtam.ai/c/snohomish-county-pud) (snopud.com)<br>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](https://www.tamtam.ai/c/hanford-mission-integration-solutions) (hmis.hanford.gov)<br>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](https://www.tamtam.ai/c/city-of-vancouver-washington) (cityofvancouver.us)<br>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](https://www.tamtam.ai/c/chelan-county-pud) (flow.page)<br>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](https://www.tamtam.ai/c/seattle-public-utilities) (seattle.gov)<br>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 |  |
| 11 | [City of Bellingham](https://www.tamtam.ai/c/city-of-bellingham) (cob.org)<br>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](https://www.tamtam.ai/c/anchor-qea) (anchorqea.com)<br>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](https://www.tamtam.ai/c/king-county-department-of-natural-resources-and-parks) (kingcounty.gov)<br>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](https://www.tamtam.ai/c/central-plateau-cleanup-company) (cpcco.hanford.gov)<br>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 |
| 15 | [Tidal Vision](https://www.tamtam.ai/c/tidal-vision) (tidalvision.com)<br>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](https://www.tamtam.ai/c/cascade-environmental-llc) (cascade-env.com)<br>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](https://www.tamtam.ai/c/city-of-olympia) (olympiawa.gov)<br>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 |  |
| 18 | [City of Auburn (Washington)](https://www.tamtam.ai/c/city-of-auburn-washington) (auburnwa.gov)<br>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](https://www.tamtam.ai/c/city-of-lynnwood) (lynnwoodwa.gov)<br>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](https://www.tamtam.ai/c/city-of-richland) (richlandwa.gov)<br>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.](https://www.tamtam.ai/c/global-diving-and-salvage-inc) (gdiving.com)<br>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](https://www.tamtam.ai/c/pacific-northern-environmental-llc) (pneco.com)<br>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)](https://www.tamtam.ai/c/ch2m-hill-plateau-remediation-company-chprc) (chprc.hanford.gov)<br>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](https://www.tamtam.ai/c/landau-associates) (landauinc.com)<br>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](https://www.tamtam.ai/c/goodwill-industries-of-the-inland-northwest) (discovergoodwill.org)<br>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](https://www.tamtam.ai/c/veolia-nuclear-solutions-federal-services) (vnsfederalservices.com)<br>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](https://www.tamtam.ai/c/alderwood-water-and-wastewater-district) (awwd.com)<br>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 |  |
| 28 | [Sammamish Plateau Water](https://www.tamtam.ai/c/sammamish-plateau-water) (spwater.org)<br>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](https://www.tamtam.ai/c/covington-water-district) (covingtonwater.com)<br>This company provides high-quality water, prioritizing customer service, strategic planning, fiscal responsibility, regulatory compliance, stewardship, and partnerships | Utilities | 🇺🇸 Covington | 19 | 1960 |

## How this list is built

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.

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## The same list elsewhere in United States

- [Environmental services companies in Texas](https://www.tamtam.ai/l/environmental-services-companies-texas) (98)
- [Environmental services companies in California](https://www.tamtam.ai/l/environmental-services-companies-california-united-states) (95)
- [Environmental services companies in Florida](https://www.tamtam.ai/l/environmental-services-companies-florida) (58)
- [Environmental services companies in New York State](https://www.tamtam.ai/l/environmental-services-companies-new-york-state-united-states) (39)
- [Environmental services companies in North Carolina](https://www.tamtam.ai/l/environmental-services-companies-north-carolina) (37)
- [Environmental services companies in Pennsylvania](https://www.tamtam.ai/l/environmental-services-companies-pennsylvania) (35)
- [Environmental services companies in Illinois](https://www.tamtam.ai/l/environmental-services-companies-illinois) (34)
- [Environmental services companies in Ohio](https://www.tamtam.ai/l/environmental-services-companies-ohio) (26)
- [Environmental services companies in Alabama](https://www.tamtam.ai/l/environmental-services-companies-alabama) (25)

## The same list elsewhere

- [Environmental services companies in the world](https://www.tamtam.ai/l/environmental-services-companies-in-the-world) (4,213)
- [Environmental services companies in North America](https://www.tamtam.ai/l/environmental-services-companies-in-north-america) (1,043)

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Source: https://www.tamtam.ai/l/environmental-services-companies-washington-state