# The 100 largest Environmental Services companies in the United States

Tamtam tracks 534 Environmental Services companies headquartered in the United States. This list ranks the 100 largest by number of employees on LinkedIn, led by WM, Republic Services and Clean Harbors. Their median headcount is 1,273. Half of them were founded in 1980 or later. The most common headquarters are Houston (4), Phoenix (3) and Washington (3).

These Environmental Services companies in the United States offer a range of solutions for waste management, recycling, environmental protection, and consulting. The companies listed include large organizations such as WM, which provides comprehensive waste collection, disposal, and recycling, and Republic Services, a leader in waste management and sustainability. Other notable firms are Clean Harbors, specializing in hazardous waste management and emergency spill response, and Veolia | North America, offering resource management solutions including water decontamination and toxic waste handling.

The data shows a diverse landscape of environmental services providers. While many companies like WM and Republic Services focus on broad waste solutions, others like Asplundh Tree Expert, LLC specialize in line clearance and vegetation management, and Hach focuses on water analysis. This mix indicates a comprehensive approach to environmental challenges across various sectors within the United States.

🇺🇸 United States · 100 companies · Updated Nov 14, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [WM](https://www.tamtam.ai/c/wm) (wm.com)<br>Provides comprehensive waste collection, disposal, recycling, and renewable energy solutions tailored to municipal, commercial, industrial, and residential customers. | Environmental Services | 🇺🇸 Houston | 28,255 |  |
| 2 | [Republic Services](https://www.tamtam.ai/c/republic-services) (republicservices.com)<br>An industry leader in environmental services, providing innovative solutions for waste management, recycling, and sustainability to create cleaner and more sustainable communities | Environmental Services | 🇺🇸 Phoenix | 21,081 | 1998 |
| 3 | [Clean Harbors](https://www.tamtam.ai/c/clean-harbors) (cleanharbors.com)<br>Provider of hazardous waste management, emergency spill response, industrial cleaning, recycling, and used oil re-refining services across North America. | Environmental Services | 🇺🇸 Norwell | 13,449 | 1980 |
| 4 | [Environment Agency](https://www.tamtam.ai/c/environment-agency) (gov.uk)<br>Protect environment across England by managing flood risks, supporting climate adaptation, conserving biodiversity, regulating pollution, and issuing environmental permits. | Environmental Services | 🇺🇸 Bristol | 10,381 | 1996 |
| 5 | [TRC Companies, Inc.](https://www.tamtam.ai/c/trc-companies-inc) (trccompanies.com)<br>Providing advisory, consulting, construction, engineering, and management services to help clients adapt and achieve sustainable, impactful results. | Environmental Services | 🇺🇸 Windsor | 7,463 | 1969 |
| 6 | [Veolia \| North America](https://www.tamtam.ai/c/veolia-north-america) (veolianorthamerica.com)<br>Provides resource management solutions including water decontamination, toxic waste handling, fossil fuel alternatives, wastewater reuse, and battery recycling for cities and industries. | Environmental Services | 🇺🇸 Boston | 5,812 |  |
| 7 | [Asplundh Tree Expert, LLC](https://www.tamtam.ai/c/asplundh-tree-expert-llc) (asplundh.com)<br>A company specializing in safe and efficient line clearance services for utilities, as well as vegetation management for various industries | Environmental Services | 🇺🇸 Willow Grove | 5,645 | 1928 |
| 8 | [Waste Connections](https://www.tamtam.ai/c/waste-connections) (careers.wasteconnections.com)<br>Integrated services company providing solid waste collection, transfer, disposal, and recycling services in the US and Canada with a focus on employee empowerment and community impact | Environmental Services | 🇺🇸 Spring | 5,355 | 1997 |
| 9 | [SUEZ - Water Technologies & Solutions](https://www.tamtam.ai/c/suez-water-technologies-and-solutions) (watertechnologies.com)<br>Providing innovative solutions for industries, including water treatment and process optimization, to help businesses thrive and overcome challenges | Environmental Services | 🇺🇸 Trevose | 4,538 |  |
| 10 | [USEPA](https://www.tamtam.ai/c/usepa) (epa.gov)<br>The company addresses environmental issues in the United States and abroad through regulation, enforcement, research, setting standards, and international coordination | Environmental Services | 🇺🇸 Washington | 4,180 | 1970 |
| 11 | [Hach](https://www.tamtam.ai/c/hach) (hach.com)<br>The company specializes in providing innovative solutions for water analysis globally, ensuring water quality through teamwork, customer partnerships, and reliable products | Environmental Services | 🇺🇸 Loveland | 3,646 |  |
| 12 | [Harsco Corporation](https://www.tamtam.ai/c/harsco-corporation) (enviri.com)<br>Global provider of environmental waste management, recycling, onsite material processing, and rail infrastructure services across multiple industries and countries. | Environmental Services | 🇺🇸 Philadelphia | 3,553 | 1853 |
| 13 | [The Davey Tree Expert Company](https://www.tamtam.ai/c/the-davey-tree-expert-company) (davey.com)<br>The organization provides research-driven tree services, grounds maintenance, and environmental solutions for various partners, focusing on sustainability and exceeding client expectations | Environmental Services | 🇺🇸 Kent | 3,268 | 1880 |
| 14 | [Pace Analytical Services](https://www.tamtam.ai/c/pace-analytical-services) (pacelabs.com)<br>Provides analytical testing, laboratory data, and life sciences services to help businesses, industries, and governments make critical decisions for a safer, healthier world. | Environmental Services | 🇺🇸 Minneapolis | 3,184 |  |
| 15 | [Safety-Kleen](https://www.tamtam.ai/c/safety-kleen) (safety-kleen.com)<br>Leading environmental services company offering used oil recycling, parts cleaning, and other responsible solutions to protect customers and the environment | Environmental Services | 🇺🇸 Plano | 3,098 |  |
| 16 | [APTIM](https://www.tamtam.ai/c/aptim) (aptim.com)<br>A professional solutions firm specializing in environmental, sustainability, resilience, and infrastructure solutions for government agencies, commercial clients, and energy customers | Environmental Services | 🇺🇸 Baton Rouge | 3,077 |  |
| 17 | [NYC Department of Environmental Protection (NYC DEP)](https://www.tamtam.ai/c/nyc-department-of-environmental-protection-nyc-dep) (nyc.gov)<br>This city agency manages New York City's water supply, distributing clean drinking water, treating wastewater, and regulating air quality and pollution | Environmental Services | 🇺🇸 Flushing | 3,005 |  |
| 18 | [Evoqua Water Technologies](https://www.tamtam.ai/c/evoqua-water-technologies) (xylem.com)<br>A global leader in water solutions, specializing in water and wastewater management, conservation, and sustainability through innovative products and expertise | Environmental Services | 🇺🇸 Washington | 2,688 |  |
| 19 | [Texas Commission on Environmental Quality](https://www.tamtam.ai/c/texas-commission-on-environmental-quality) (tceq.texas.gov)<br>Environmental agency in Texas with a focus on clean air, clean water, and waste management, striving for sustainable economic development and public participation | Environmental Services | 🇺🇸 Austin | 2,659 |  |
| 20 | [Brown and Caldwell](https://www.tamtam.ai/c/brown-and-caldwell) (brownandcaldwell.com)<br>Privately-held environmental firm specializing in US water and environmental sectors Offering engineering, scientific, consulting, and construction services globally Passionate about innovation and service excellence | Environmental Services | 🇺🇸 Walnut Creek | 2,556 | 1947 |
| 21 | [Geosyntec Consultants](https://www.tamtam.ai/c/geosyntec-consultants) (geosyntec.com)<br>Consulting and engineering firm specializing in solving environmental challenges and addressing civil infrastructure needs for private and public sector clients | Environmental Services | 🇺🇸 Boca Raton | 2,490 | 1983 |
| 22 | [Aptive Environmental](https://www.tamtam.ai/c/aptive-environmental) (aptivepestcontrol.com)<br>Aptive Environmental is a rapidly expanding pest control service focused on eliminating pests and creating a positive home environment while giving back to global health initiatives | Environmental Services | 🇺🇸 Provo | 2,374 | 2015 |
| 23 | [National Weather Service](https://www.tamtam.ai/c/national-weather-service) (weather.gov)<br>This company provides weather, water, and climate data services, forecasts, warnings, and decision support for safety and economic benefit, with various career opportunities available | Environmental Services | 🇺🇸 Silver Spring | 2,369 | 1890 |
| 24 | [Florida Department of Environmental Protection](https://www.tamtam.ai/c/florida-department-of-environmental-protection) (floridadep.gov)<br>This organization focuses on protecting Florida's natural resources, managing state parks and overseeing regulatory programs to safeguard air, water, and land | Environmental Services | 🇺🇸 Tallahassee | 2,309 |  |
| 25 | [Onterris](https://www.tamtam.ai/c/onterris) (onterris.com)<br>Partners with organizations to solve complex environmental challenges, delivering solutions strengthening client resilience, mitigating risk, and protecting air, water, and soil. | Environmental Services | 🇺🇸 North Little Rock | 2,284 | 2012 |
| 26 | [Hazen and Sawyer](https://www.tamtam.ai/c/hazen-and-sawyer) (hazenandsawyer.com)<br>A company focused on providing safe drinking water and controlling water pollution through planning, design, and construction management of water-related projects | Environmental Services | 🇺🇸 New York | 2,261 | 1951 |
| 27 | [NYS Department of Environmental Conservation](https://www.tamtam.ai/c/nys-department-of-environmental-conservation) (dec.ny.gov)<br>This company, based in New York State, is dedicated to protecting the environment, wildlife, and public lands while educating the public on conservation | Environmental Services | 🇺🇸 Albany | 2,259 | 1970 |
| 28 | [Trinity Consultants](https://www.tamtam.ai/c/trinity-consultants) (trinityconsultants.com)<br>A global EH&S firm offering services in regulatory compliance, ecology, water, built environments, and life sciences since 1974 | Environmental Services | 🇺🇸 Dallas | 2,195 | 1974 |
| 29 | [Providence - An Engineering and Environmental Consulting Firm](https://www.tamtam.ai/c/providence-an-engineering-and-environmental-consulting-firm) (providenceeng.com)<br>Employee-owned engineering and environmental consulting firm with experienced professionals offering services in engineering, environmental, and technology disciplines for governmental and industrial clients | Environmental Services | 🇺🇸 Baton Rouge | 2,017 | 2000 |
| 30 | [Eurofins Environment Testing (USA)](https://www.tamtam.ai/c/eurofins-environment-testing-usa) (eurofinsus.com)<br>Provides comprehensive environmental testing services across the US, including air, water, soil, hazardous waste, and indoor air quality analysis for various sectors. | Environmental Services | 🇺🇸 Lancaster | 1,966 | 1987 |
| 31 | [Wisconsin Department of Natural Resources (DNR)](https://www.tamtam.ai/c/wisconsin-department-of-natural-resources-dnr) (dnr.wisconsin.gov)<br>Preservation, protection, and management of Wisconsin's natural resources, enforcing laws, and providing outdoor recreational opportunities. | Environmental Services | 🇺🇸 Madison | 1,956 |  |
| 32 | [ALS Life Sciences](https://www.tamtam.ai/c/als-life-sciences) (alsglobal.com)<br>A global company offers testing, inspection, certification, and verification services, along with state-of-the-art technical solutions for efficient, socially responsible business operations | Environmental Services | 🇺🇸 Houston | 1,954 |  |
| 33 | [Enviri](https://www.tamtam.ai/c/enviri) (enviri.com)<br>The company provides essential waste management solutions for hazardous and non-hazardous waste, contaminated soil, and recycling services for steel and metals industries worldwide | Environmental Services | 🇺🇸 Philadelphia | 1,900 |  |
| 34 | [Carollo Engineers](https://www.tamtam.ai/c/carollo-engineers) (carollo.com)<br>Specializing solely in water related engineering, we provide innovative solutions, unparalleled client service, and a collaborative working environment since 1933 | Environmental Services | 🇺🇸 Walnut Creek | 1,803 | 1933 |
| 35 | [Verdantas](https://www.tamtam.ai/c/verdantas) (verdantas.com)<br>Verdantas blends engineering, environmental science, and advanced technology to provide forward-thinking solutions for a sustainable future through a people-focused approach | Environmental Services | 🇺🇸 Tampa | 1,790 |  |
| 36 | [Covanta](https://www.tamtam.ai/c/covanta) (linktr.ee)<br>A company specializing in sustainable materials management, offering environmental solutions to businesses and communities through state-of-the-art facilities and services | Environmental Services | 🇺🇸 Morristown | 1,771 | 1983 |
| 37 | [SWCA Environmental Consultants](https://www.tamtam.ai/c/swca-environmental-consultants) (swca.com)<br>Experts deliver comprehensive solutions in environmental planning, permitting, cultural resource management, biological services, water resources management, air quality, and sustainability consulting. | Environmental Services | 🇺🇸 Phoenix | 1,746 | 1981 |
| 38 | [Rumpke Waste & Recycling](https://www.tamtam.ai/c/rumpke-waste-and-recycling) (rumpke.com)<br>A waste and recycling company founded in 1932, providing environmentally friendly solutions to residential and commercial areas in Ohio, Kentucky, Indiana, and West Virginia | Environmental Services | 🇺🇸 Cincinnati | 1,731 | 1932 |
| 39 | [Clean Earth](https://www.tamtam.ai/c/clean-earth) (cleanearthinc.com)<br>Leading provider of environmental and regulated waste management services, offering tailored solutions for recycling, repurposing, and safely disposing of difficult wastes Promotes sustainability | Environmental Services | 🇺🇸 King of Prussia | 1,701 | 1990 |
| 40 | [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 |
| 41 | [Partner Engineering & Science, Inc.](https://www.tamtam.ai/c/partner-engineering-and-science-inc) (partneresi.com)<br>National firm providing engineering, environmental, and energy consulting services, from due diligence to design, construction, maintenance, and compliance in various industries | Environmental Services | 🇺🇸 Torrance | 1,438 | 2007 |
| 42 | [Casella Waste Systems, Inc.](https://www.tamtam.ai/c/casella-waste-systems-inc) (casella.com)<br>Leader in integrated resource management, recycling, and waste disposal services across the Eastern US, with a strong focus on sustainability | Environmental Services | 🇺🇸 Rutland | 1,419 | 1975 |
| 43 | [Rain For Rent](https://www.tamtam.ai/c/rain-for-rent) (rainforrent.com)<br>Provider of temporary liquid handling solutions through pumps, tanks, filtration, and spill containment for flood relief, construction dewatering, sewer bypasses, and turnarounds. | Environmental Services | 🇺🇸 Bakersfield | 1,386 | 1934 |
| 44 | [State Water Resources Control Board](https://www.tamtam.ai/c/state-water-resources-control-board) (waterboards.ca.gov)<br>The company works under the California Environmental Protection Agency to preserve, enhance, and restore water quality for environmental protection and public health | Environmental Services | 🇺🇸 Sacramento | 1,377 |  |
| 45 | [Crystal Clean](https://www.tamtam.ai/c/crystal-clean) (crystal-clean.com)<br>A national leader in environmental services, HCC operates a network of branches across the US, focusing on environmentally sustainable waste disposal and recycling | Environmental Services | 🇺🇸 Hoffman Estates | 1,375 | 1999 |
| 46 | [US Ecology Inc., a Republic Services Company](https://www.tamtam.ai/c/us-ecology-inc-a-republic-services-company) (republicservices.com)<br>A leading provider of environmental services in North America, addressing waste management needs through treatment, disposal, recycling, and industrial services | Environmental Services | 🇺🇸 Boise | 1,323 | 1952 |
| 47 | [Recology](https://www.tamtam.ai/c/recology) (recology.com)<br>Recology provides waste collection, recycling, and composting services in multiple states, prioritizing sustainability, employee ownership, and customer satisfaction | Environmental Services | 🇺🇸 San Francisco | 1,306 | 1920 |
| 48 | [EnergySolutions](https://www.tamtam.ai/c/energysolutions) (energysolutions.com)<br>International leader in nuclear services for safe recycling, processing, and disposal of nuclear material, providing decommissioning and decontamination services for nuclear facilities | Environmental Services | 🇺🇸 Salt Lake City | 1,294 | 2006 |
| 49 | [SCS Engineers](https://www.tamtam.ai/c/scs-engineers) (scsengineers.com)<br>Environmental solutions provider with expertise in compliance, technology, consulting, engineering, construction, O&M, monitoring, and compliance for private and public sector clients | Environmental Services | 🇺🇸 Long Beach | 1,278 | 1970 |
| 50 | [Wright Tree Service](https://www.tamtam.ai/c/wright-tree-service) (wrighttree.com)<br>An employee-owned company providing vegetation management services including utility line clearance, land clearing, and response to natural disasters for power restoration | Environmental Services | 🇺🇸 West Des Moines | 1,273 | 1933 |
| 51 | [Aquatech](https://www.tamtam.ai/c/aquatech) (aquatech.com)<br>Global leader in water technology, specializing in desalination, water reuse, and zero liquid discharge solutions to reduce water and carbon footprint worldwide | Environmental Services | 🇺🇸 Canonsburg | 1,270 | 1981 |
| 52 | [IEA](https://www.tamtam.ai/c/iea) (ieasafety.com)<br>A small business specializing in environmental safety consulting for private and public organizations, focusing on indoor environments with a team of over 50 professionals | Environmental Services | 🇺🇸 Brooklyn Park | 1,235 | 1984 |
| 53 | [Haley & Aldrich](https://www.tamtam.ai/c/haley-and-aldrich) (haleyaldrich.com)<br>A multidisciplinary team of experts committed to delivering value in capital, operations, and environmental projects through creative collaboration and efficient solutions | Environmental Services | 🇺🇸 Burlington | 1,224 | 1957 |
| 54 | [Alliance Technical Group](https://www.tamtam.ai/c/alliance-technical-group) (alliancetg.com)<br>A leading provider of source testing, emissions monitoring, and analytical services in the United States, offering quick proposals, regulatory compliance, and accurate testing | Environmental Services | 🇺🇸 Decatur | 1,196 | 2000 |
| 55 | [AGS](https://www.tamtam.ai/c/ags) (linktr.ee)<br>Custom architectural signage firm specializing in interior and exterior wayfinding, donor recognition, and interpretive exhibits for various organizations, with proven project management and design expertise | Environmental Services | 🇺🇸 Exton | 1,156 | 1962 |
| 56 | [Woodard & Curran](https://www.tamtam.ai/c/woodard-and-curran) (woodardcurran.com)<br>Integrated firm specializing in water and environmental projects, offering tailored solutions through science, engineering, design-build, operations, and collaborative partnerships with clients | Environmental Services | 🇺🇸 Portland | 1,148 | 1979 |
| 57 | [Washington Department of Fish & Wildlife](https://www.tamtam.ai/c/washington-department-of-fish-and-wildlife) (wdfw.wa.gov)<br>This organization provides information and resources to protect, restore, and enhance fish and wildlife in Washington state | Environmental Services | 🇺🇸 Olympia | 1,148 |  |
| 58 | [MPS Group](https://www.tamtam.ai/c/mps-group) (mpsgrp.com)<br>A managed professional services company offering environmental consulting, waste management, industrial services, and facility decommissioning with a focus on quality and innovation | Environmental Services | 🇺🇸 Farmington Hills | 1,133 | 1995 |
| 59 | [SavATree](https://www.tamtam.ai/c/savatree) (savatree.com)<br>A full-service company specializing in green tree, shrub and lawn care, using cutting-edge technology and patented ingredients with a passionate "Green Team" | Environmental Services | 🇺🇸 Bedford Hills | 1,109 | 1985 |
| 60 | [Triumvirate Environmental](https://www.tamtam.ai/c/triumvirate-environmental) (triumvirate.com)<br>Sustainable environmental solutions for Life Sciences, Healthcare, Education, and Industrial sectors, specializing in waste management, EHS consulting, decontamination, and facility services | Environmental Services | 🇺🇸 Somerville | 1,096 | 1988 |
| 61 | [Blackstone Consulting, Inc.](https://www.tamtam.ai/c/blackstone-consulting-inc) (blackstone-consulting.com)<br>A minority-owned company providing environmental, security, facilities maintenance, staffing, and food service management services to national and international clients since 1991 | Environmental Services | 🇺🇸 Los Angeles | 1,091 | 1991 |
| 62 | [Resource Innovations](https://www.tamtam.ai/c/resource-innovations) (resource-innovations.com)<br>A women-led energy transformation focused on clean energy solutions, specializing in energy efficiency and guiding utilities through complex challenges | Environmental Services | 🇺🇸 Half Moon Bay | 1,072 | 2016 |
| 63 | [Arcwood Environmental](https://www.tamtam.ai/c/arcwood-environmental) (arcwoodenviro.com)<br>delivers comprehensive environmental services, partners with companies to solve industrial waste problems, protection of human health and the environment. | Environmental Services | 🇺🇸 Indianapolis | 1,027 |  |
| 64 | [Harsco Metals & Minerals](https://www.tamtam.ai/c/harsco-metals-and-minerals) (harsco-environmental.com)<br>Harsco Metals & Minerals is now Harsco Environmental, focusing on sustainable solutions for waste management and resource recovery Visit their LinkedIn page | Environmental Services | 🇺🇸 Camp Hill | 1,020 |  |
| 65 | [Los Angeles County Sanitation Districts](https://www.tamtam.ai/c/los-angeles-county-sanitation-districts) (lacsd.org)<br>The company provides wastewater and solid waste management services, converting waste into resources like reclaimed water, energy, and recycled materials | Environmental Services | 🇺🇸 Whittier | 997 | 1923 |
| 66 | [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 |
| 67 | [Montrose Environmental Group](https://www.tamtam.ai/c/montrose-environmental-group) (onterris.com)<br>Innovative environmental solutions provider leveraging expertise, technology, and local knowledge to address challenges and achieve sustainable outcomes for clients | Environmental Services | 🇺🇸 Little Rock | 952 |  |
| 68 | [FCC Environmental Services](https://www.tamtam.ai/c/fcc-environmental-services) (fccenvironmental.com)<br>An award-winning leader in environmental services providing waste and recycling solutions to households and commercial customers, transforming waste into resources | Environmental Services | 🇺🇸 Houston | 948 |  |
| 69 | [GZA GeoEnvironmental, Inc.](https://www.tamtam.ai/c/gza-geoenvironmental-inc) (gza.com)<br>A full-service consulting firm established in 1964, offering diversified technical services in geotechnical, environmental engineering, water, ecology, and construction management | Environmental Services | 🇺🇸 Norwood | 939 | 1964 |
| 70 | [ENGIE Impact](https://www.tamtam.ai/c/engie-impact) (engieimpact.com)<br>Sustainability solutions provider for corporations, cities, and governments worldwide, offering strategic and technical support to tackle complex sustainability challenges Leader in zero-carbon transition | Environmental Services | 🇺🇸 Washington | 934 | 1996 |
| 71 | [California Department of Toxic Substances Control](https://www.tamtam.ai/c/california-department-of-toxic-substances-control) (dtsc.ca.gov)<br>Protecting California's people and environment from harmful effects of toxic substances by enforcing laws, reducing waste generation, and promoting chemically safer products | Environmental Services | 🇺🇸 Sacramento | 919 |  |
| 72 | [tpg transports publics genevois](https://www.tamtam.ai/c/tpg-transports-publics-genevois) (tpg.ch)<br>Providing modern and efficient public transportation solutions in Geneva, addressing mobility challenges while honoring historical roots and community belonging. | Environmental Services | 🇺🇸 Le Grand-Lancy | 899 |  |
| 73 | [Advanced Disposal Services, Inc.](https://www.tamtam.ai/c/advanced-disposal-services-inc) (wm.com)<br>Provider of waste management and environmental services in North America, including collection, transfer, disposal, recycling, and landfill gas-to-energy facilities Serving residential, commercial, industrial, and municipal customers | Environmental Services | 🇺🇸 Ponte Vedra | 895 | 2000 |
| 74 | [CECO Environmental Corporation](https://www.tamtam.ai/c/ceco-environmental-corporation) (cecoenviro.com)<br>A global industrial company specializing in environmentally focused solutions for air quality, energy optimization, and custom engineered applications across various markets | Environmental Services | 🇺🇸 Addison | 885 | 1966 |
| 75 | [EA Engineering, Science, and Technology, Inc., PBC](https://www.tamtam.ai/c/ea-engineering-science-and-technology-inc-pbc) (eaest.com)<br>An employee-owned public benefit corporation providing environmental, compliance, natural resources, and infrastructure engineering and management solutions to public and private clients nationwide | Environmental Services | 🇺🇸 Hunt Valley | 880 | 1973 |
| 76 | [Eurofins TestAmerica](https://www.tamtam.ai/c/eurofins-testamerica) (testamericainc.com)<br>Leading environmental testing firm with over 80 nationwide locations, offering innovative technical expertise and comprehensive analytical testing services Commitment to employee growth and success | Environmental Services | 🇺🇸 North Canton | 866 |  |
| 77 | [Gradiant](https://www.tamtam.ai/c/gradiant) (gradiant.com)<br>Provides advanced water and wastewater treatment solutions for critical industries, reducing water usage, reclaiming resources, and renewing wastewater into freshwater. | Environmental Services | 🇺🇸 Woburn | 859 | 2013 |
| 78 | [Dudek](https://www.tamtam.ai/c/dudek) (dudek.com)<br>Employee-owned firm with 800+ environmental and engineering professionals nationwide, specializing in improving infrastructure and natural environment for public and private clients since 1980 | Environmental Services | 🇺🇸 Encinitas | 850 | 1980 |
| 79 | [Hawx Smart Pest Control](https://www.tamtam.ai/c/hawx-smart-pest-control) (hawxpestcontrol.com)<br>A pest control company offering extermination services with a focus on customer service, using environmentally conscious solutions to protect health and property | Environmental Services | 🇺🇸 Ogden | 848 | 2013 |
| 80 | [Student Conservation Association](https://www.tamtam.ai/c/student-conservation-association) (thesca.org)<br>Leading provider of hands-on environmental conservation programs for youth and adults, empowering the next generation of conservation leaders through service to the land | Environmental Services | 🇺🇸 Arlington | 842 | 1957 |
| 81 | [Sims Metal](https://www.tamtam.ai/c/sims-metal) (simsmm.com)<br>Global metal recycler buying, processing, and selling ferrous and non-ferrous metals with facilities across US, Australasia, UK, serving commercial and industrial scrap producers. | Environmental Services | 🇺🇸 Jersey City | 840 | 1917 |
| 82 | [Minnesota Pollution Control Agency](https://www.tamtam.ai/c/minnesota-pollution-control-agency) (pca.state.mn.us)<br>Monitors environmental quality, enforces regulations, cleans spills, develops policy, supports education, and collaborates to prevent pollution and conserve resources. | Environmental Services | 🇺🇸 Saint Paul | 819 |  |
| 83 | [EEI Corporation](https://www.tamtam.ai/c/eei-corporation) (eeicorp.com)<br>EEI Corporation provides Environmental, Energy, Safety, Industrial Hygiene, and Security services globally, with expertise in auditing and federal contracts | Environmental Services | 🇺🇸 Rockville | 790 | 1995 |
| 84 | [Calgon Carbon Corporation](https://www.tamtam.ai/c/calgon-carbon-corporation) (calgoncarbon.com)<br>Activated carbon products for water, air, and environmental purification across more than 700 applications, leveraging over 80 years expertise. | Environmental Services | 🇺🇸 Moon Township | 783 | 1942 |
| 85 | [The Brickman Group](https://www.tamtam.ai/c/the-brickman-group) (brightview.com)<br>A leading landscape services company with 20,000+ team members offering design, development, maintenance, and enhancements for various industries nationwide | Environmental Services | 🇺🇸 Plymouth Meeting | 767 | 1939 |
| 86 | [ValleyCrest Companies](https://www.tamtam.ai/c/valleycrest-companies) (brightview.com)<br>Leading landscape services company with 20,000+ team members offering design, maintenance, and enhancements to various properties nationwide, fostering collaborative client relationships for success | Environmental Services | 🇺🇸 Plymouth Meeting | 765 | 1939 |
| 87 | [SCS Global Services](https://www.tamtam.ai/c/scs-global-services) (scsglobalservices.com)<br>Trusted leader in third-party environmental, sustainability, and food quality certification, auditing, testing, and standards development, driving practices for sustainable development worldwide | Environmental Services | 🇺🇸 Emeryville | 762 | 1984 |
| 88 | [Environmental Science Associates](https://www.tamtam.ai/c/environmental-science-associates) (esassoc.com)<br>Employee-owned environmental consulting firm with expertise in planning, design, permitting, mitigation, restoration, and compliance for diverse projects across various regions | Environmental Services | 🇺🇸 San Francisco | 746 | 1969 |
| 89 | [UCOR](https://www.tamtam.ai/c/ucor) (ucor.com)<br>Leader in deactivating and demolishing nuclear facilities, committed to safe performance, innovation, and environmental protection in partnership with DOE | Environmental Services | 🇺🇸 Oak Ridge | 743 | 2011 |
| 90 | [South Coast Air Quality Management District](https://www.tamtam.ai/c/south-coast-air-quality-management-district) (aqmd.gov)<br>Regulatory agency in Southern California working to improve air quality by controlling emissions from stationary sources and advocating for public health | Environmental Services | 🇺🇸 Diamond Bar | 740 |  |
| 91 | [WIN Waste Innovations](https://www.tamtam.ai/c/win-waste-innovations) (win-waste.com)<br>A waste management company with 2,100 employees, operating 50 assets that process 11 million tons of waste annually, converting waste into clean energy and recycling materials | Environmental Services | 🇺🇸 Portsmouth | 721 |  |
| 92 | [Arizona Department of Environmental Quality ADEQ](https://www.tamtam.ai/c/arizona-department-of-environmental-quality-adeq) (azdeq.gov)<br>Protect and enhance public health and environment by managing air quality, water resources, and land conditions to meet safety standards. | Environmental Services | 🇺🇸 Phoenix | 720 | 1986 |
| 93 | [Savannah River Remediation](https://www.tamtam.ai/c/savannah-river-remediation) (srremediation.net)<br>The company is the Liquid Waste Contractor for the US Department of Energy, focusing on stabilizing radioactive liquid waste into solid form | Environmental Services | 🇺🇸 Aiken | 719 |  |
| 94 | [HydroChemPSC](https://www.tamtam.ai/c/hydrochempsc) (hpc-industrial.com)<br>HydroChemPSC provides specialty maintenance services and technology solutions to critical energy infrastructure in the US, emphasizing safety, efficiency, and environmental compliance | Environmental Services | 🇺🇸 Deer Park | 717 | 1977 |
| 95 | [ALS - North America, Environmental](https://www.tamtam.ai/c/als-north-america-environmental) (alsglobal.com)<br>ALS provides a wide range of environmental analytical testing services worldwide for soil, water, air, and biota, with expertise in specialty testing areas | Environmental Services | 🇺🇸 Houston | 713 |  |
| 96 | [EMSL Analytical, Inc.](https://www.tamtam.ai/c/emsl-analytical-inc) (emsl.com)<br>A leading environmental testing firm offering analytical services nationwide, specializing in asbestos, microbiology, lead paint, indoor air quality, industrial hygiene, and food testing | Environmental Services | 🇺🇸 Cinnaminson | 712 | 1981 |
| 97 | [Athens Services](https://www.tamtam.ai/c/athens-services) (athensservices.com)<br>Family-owned waste collection & recycling company serving 275,000+ customers in greater Los Angeles area with focus on sustainability & community investment | Environmental Services | 🇺🇸 City of Industry | 702 | 1957 |
| 98 | [Albireo Energy](https://www.tamtam.ai/c/albireo-energy) (albireoenergy.com)<br>A leading provider of building controls and energy services, helping building owners achieve high-performance, sustainable buildings through innovative technology solutions and services | Environmental Services | 🇺🇸 Edison | 699 | 2014 |
| 99 | [Ohio Department of Natural Resources](https://www.tamtam.ai/c/ohio-department-of-natural-resources) (ohiodnr.gov)<br>A government agency in Ohio responsible for maintaining state parks, public lands, forests, waterways, and wildlife through various divisions and programs | Environmental Services | 🇺🇸 Columbus | 699 | 1949 |
| 100 | [RoadRunner](https://www.tamtam.ai/c/roadrunner-pittsburgh) (roadrunnerwm.com)<br>Innovative waste and recycling company offering tech-enhanced services to streamline operations, drive cost savings, and increase landfill diversion for zero waste goals | Environmental Services | 🇺🇸 Pittsburgh | 693 | 2014 |

## 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 14, 2026.

## More company lists in the United States

- [The largest companies in the United States](https://www.tamtam.ai/l/largest-companies-united-states) (104,979)
- [Multinational companies in the United States](https://www.tamtam.ai/l/multinational-companies-united-states) (16,191)
- [Manufacturers in the United States](https://www.tamtam.ai/l/manufacturers-united-states) (8,677)
- [Professional services firms in the United States](https://www.tamtam.ai/l/professional-services-firms-united-states) (7,080)
- [Retail chains in the United States](https://www.tamtam.ai/l/retail-chains-united-states) (6,981)
- [Financial services firms in the United States](https://www.tamtam.ai/l/financial-services-firms-united-states) (6,867)
- [Companies with in-house R&D in the United States](https://www.tamtam.ai/l/r-and-d-companies-united-states) (6,794)
- [IT Services and IT Consulting companies in the United States](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-united-states) (6,695)
- [SaaS companies in the United States](https://www.tamtam.ai/l/saas-companies-united-states) (6,410)
- [IT services companies in the United States](https://www.tamtam.ai/l/it-services-companies-united-states) (5,818)
- [Healthcare providers in the United States](https://www.tamtam.ai/l/healthcare-providers-united-states) (5,810)
- [Critical infrastructure operators in the United States](https://www.tamtam.ai/l/critical-infrastructure-operators-united-states) (5,801)
- [Hospitals and Health Care companies in the United States](https://www.tamtam.ai/l/hospitals-and-health-care-companies-united-states) (5,573)
- [Hardware manufacturers in the United States](https://www.tamtam.ai/l/hardware-companies-united-states) (5,344)
- [Software Development companies in the United States](https://www.tamtam.ai/l/software-development-companies-united-states) (5,311)
- [Financial Services companies in the United States](https://www.tamtam.ai/l/financial-services-companies-united-states) (5,014)
- [Companies with a mobile app in the United States](https://www.tamtam.ai/l/companies-with-mobile-app-united-states) (4,663)
- [Consulting firms in the United States](https://www.tamtam.ai/l/consulting-firms-united-states) (4,383)
- [AI companies in the United States](https://www.tamtam.ai/l/ai-companies-united-states) (4,246)
- [Public sector organisations in the United States](https://www.tamtam.ai/l/public-sector-organisations-united-states) (4,151)
- [Subscription businesses in the United States](https://www.tamtam.ai/l/subscription-businesses-united-states) (3,923)
- [Real Estate companies in the United States](https://www.tamtam.ai/l/real-estate-companies-united-states) (3,808)
- [Higher Education companies in the United States](https://www.tamtam.ai/l/higher-education-companies-united-states) (3,470)
- [Construction companies in the United States](https://www.tamtam.ai/l/construction-companies-united-states) (3,271)

## The same list elsewhere in United States

- [Environmental Services companies in California](https://www.tamtam.ai/l/environmental-services-companies-california) (74)
- [Environmental Services companies in New York State](https://www.tamtam.ai/l/environmental-services-companies-new-york-state) (48)
- [Environmental Services companies in Texas](https://www.tamtam.ai/l/environmental-services-companies-texas-united-states) (44)
- [Environmental Services companies in Florida](https://www.tamtam.ai/l/environmental-services-companies-florida-united-states) (28)
- [Environmental Services companies in Pennsylvania](https://www.tamtam.ai/l/environmental-services-companies-pennsylvania-united-states) (27)

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Source: https://www.tamtam.ai/l/environmental-services-companies-united-states