# Top 35 environmental services companies in Pennsylvania
Tamtam tracks 35 environmental services companies headquartered in Pennsylvania. This list ranks all of them by number of employees on LinkedIn, led by Asplundh Tree Expert, LLC, SUEZ - Water Technologies & Solutions and Harsco Corporation. Their median headcount is 547. Half of them were founded in 1981 or later. The most common headquarters are Pittsburgh (5), Philadelphia (3) and King of Prussia (2).
This list of Pennsylvania companies includes environmental services providers, utilities, and some firms in professional services and mining. Most are large, established organizations, with several founded in the early to mid-20th century. Examples include Asplundh Tree Expert, specializing in line clearance, and SUEZ - Water Technologies & Solutions, which offers water treatment and process optimization.
Other notable companies are Harsco Corporation, a global provider of waste management and recycling services, and Aqua, which delivers water and wastewater services. Many of these companies have headquarters in the greater Philadelphia area, including Philadelphia, Willow Grove, Trevose, and King of Prussia.
๐บ๐ธ Pennsylvania ยท 35 companies ยท Updated Nov 12, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Asplundh Tree Expert, LLC](https://www.tamtam.ai/c/asplundh-tree-expert-llc) (asplundh.com)
A company specializing in safe and efficient line clearance services for utilities, as well as vegetation management for various industries | Environmental Services | ๐บ๐ธ Willow Grove | 5,645 | 1928 |
| 2 | [SUEZ - Water Technologies & Solutions](https://www.tamtam.ai/c/suez-water-technologies-and-solutions) (watertechnologies.com)
Providing innovative solutions for industries, including water treatment and process optimization, to help businesses thrive and overcome challenges | Environmental Services | ๐บ๐ธ Trevose | 4,538 | |
| 3 | [Harsco Corporation](https://www.tamtam.ai/c/harsco-corporation) (enviri.com)
Global provider of environmental waste management, recycling, onsite material processing, and rail infrastructure services across multiple industries and countries. | Environmental Services | ๐บ๐ธ Philadelphia | 3,553 | 1853 |
| 4 | [Aqua](https://www.tamtam.ai/c/aqua) (aquawater.com)
Providing water and wastewater services to over 3 million people across multiple U.S. states with a focus on safety and integrity. | Utilities | ๐บ๐ธ Bryn Mawr | 3,174 | |
| 5 | [Eurofins Environment Testing (USA)](https://www.tamtam.ai/c/eurofins-environment-testing-usa) (eurofinsus.com)
Provides comprehensive environmental testing services across the US, including air, water, soil, hazardous waste, and indoor air quality analysis for various sectors. | Environmental Services | ๐บ๐ธ Lancaster | 1,966 | 1987 |
| 6 | [Enviri](https://www.tamtam.ai/c/enviri) (enviri.com)
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 | ๐บ๐ธ Philadelphia | 1,900 | |
| 7 | [Clean Earth](https://www.tamtam.ai/c/clean-earth) (cleanearthinc.com)
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 | ๐บ๐ธ King of Prussia | 1,701 | 1990 |
| 8 | [Inframark](https://www.tamtam.ai/c/inframark) (inframark.com)
Specializing in water infrastructure management, operations, and support services, we tailor solutions for clients to achieve performance, safety, compliance, and reliability | Utilities | ๐บ๐ธ Horsham | 1,527 | |
| 9 | [Weston Solutions, Inc.](https://www.tamtam.ai/c/weston-solutions-inc) (westonsolutions.com)
A national environmental and infrastructure services firm providing excellence in remediation, compliance, water management, infrastructure improvements, and more for various clients | Professional Services | ๐บ๐ธ West Chester | 1,459 | 1957 |
| 10 | [Aquatech](https://www.tamtam.ai/c/aquatech) (aquatech.com)
Global leader in water technology, specializing in desalination, water reuse, and zero liquid discharge solutions to reduce water and carbon footprint worldwide | Environmental Services | ๐บ๐ธ Canonsburg | 1,270 | 1981 |
| 11 | [TMS International LLC](https://www.tamtam.ai/c/tms-international-llc) (tmsinternational.com)
A global leader in providing on-site steel mill services, focused on safety, innovation, environmental protection, and creating value for customers through expertise and unrivaled service | Mining | ๐บ๐ธ Pittsburgh | 1,146 | 1926 |
| 12 | [Harsco Metals & Minerals](https://www.tamtam.ai/c/harsco-metals-and-minerals) (harsco-environmental.com)
Harsco Metals & Minerals is now Harsco Environmental, focusing on sustainable solutions for waste management and resource recovery Visit their LinkedIn page | Environmental Services | ๐บ๐ธ Camp Hill | 1,020 | |
| 13 | [Liberty Tire Recycling, LLC](https://www.tamtam.ai/c/liberty-tire-recycling-llc) (libertytire.com)
Reclaims over four billion pounds of scrap tires annually, transforming waste into sustainable products through a network of North American processing facilities. | Renewable Energy Semiconductor Manufacturing | ๐บ๐ธ Pittsburgh | 927 | 2000 |
| 14 | [Philadelphia Water Department](https://www.tamtam.ai/c/philadelphia-water-department) (water.phila.gov)
This company provides integrated water, wastewater, and stormwater services to the City of Philadelphia's 15 million residents, focusing on high-quality water supply and watershed management | Government Administration | ๐บ๐ธ Philadelphia | 863 | 1951 |
| 15 | [Calgon Carbon Corporation](https://www.tamtam.ai/c/calgon-carbon-corporation) (calgoncarbon.com)
Activated carbon products for water, air, and environmental purification across more than 700 applications, leveraging over 80 years expertise. | Environmental Services | ๐บ๐ธ Moon Township | 783 | 1942 |
| 16 | [RoadRunner](https://www.tamtam.ai/c/roadrunner-pittsburgh) (roadrunnerwm.com)
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 | ๐บ๐ธ Pittsburgh | 693 | 2014 |
| 17 | [GE Water & Process Technologies](https://www.tamtam.ai/c/ge-water-and-process-technologies) (gewater.com)
A leader in developing water and process solutions for various industries, focusing on efficiency, profitability, and environmental sustainability | Environmental Services | ๐บ๐ธ Trevose | 576 | |
| 18 | [Veolia \| Water Tech North America](https://www.tamtam.ai/c/veolia-water-tech-north-america) (veoliawatertech.com)
Global experts in water technology delivering sustainable water treatment and process solutions ensuring efficiency, resilience, and environmental protection for businesses and communities. | Environmental Services | ๐บ๐ธ Plainfield | 547 | 1853 |
| 19 | [H&K Group, Inc.](https://www.tamtam.ai/c/h-and-k-group-inc) (hkgroup.com)
Family-owned group, heavy civil construction, materials supplier, land development, transportation, water management, demolition, emergency response, building materials, ready-mix concrete, precast concrete, and landscape materials. | Construction | ๐บ๐ธ Skippack | 540 | 1968 |
| 20 | [Phoenix Global](https://www.tamtam.ai/c/phoenix-global) (phoenixglobal.com)
Specializes in slag handling, metal recovery, and scrap handling services for steel mills, enhancing operational efficiency and resource management. | Mining | ๐บ๐ธ Radnor | 536 | |
| 21 | [Microbac Laboratories, Inc.](https://www.tamtam.ai/c/microbac-laboratories-inc) (microbac.com)
Testing company partnering with businesses to ensure quality, safety, and performance of products and operations through a network of laboratories Delivery of timely and reliable data | Biotechnology Research | ๐บ๐ธ Pittsburgh | 479 | 1969 |
| 22 | [Quench USA, Inc.](https://www.tamtam.ai/c/quench-usa-inc) (quench.culligan.com)
Providing water-as-a-service solutions with point-of-use machines offering various water options to keep employees, customers, and guests happy and hydrated | Retail Office Equipment | ๐บ๐ธ King of Prussia | 465 | 1997 |
| 23 | [ALL4](https://www.tamtam.ai/c/all4) (all4inc.com)
Environmental, health, and safety consulting firm offering tailored services to help clients turn environmental management into a company asset for competitive advantage | Environmental Services | ๐บ๐ธ Kimberton | 414 | 2002 |
| 24 | [City of Bethlehem](https://www.tamtam.ai/c/city-of-bethlehem) (bethlehem-pa.gov)
A university providing academic programs, degrees, and opportunities for personal and professional growth to students seeking higher education | Government Administration | ๐บ๐ธ Bethlehem | 321 | 1741 |
| 25 | [Keystone Clearwater Solutions](https://www.tamtam.ai/c/keystone-clearwater-solutions) (keystoneclear.com)
A provider of engineered solutions for safe and efficient water transfer, management, and environmental services for various industries with innovative technology and 24/7 emergency response | Oil and Gas | ๐บ๐ธ Hershey | 319 | |
| 26 | [Ecovyst, Inc.](https://www.tamtam.ai/c/ecovyst-inc) (ecovyst.com)
A catalyst and services company with a focus on supporting ecological health, providing specialty sulfuric acid, and developing technologies for cleaner fuels and waste reduction | Chemical Manufacturing | ๐บ๐ธ Wayne | 235 | |
| 27 | [Pittsburgh Water](https://www.tamtam.ai/c/pittsburgh-water) (pgh2o.com)
The company is a large authority providing water, sewer, and stormwater services to 465,000 consumers in Pittsburgh and surrounding areas | Utilities | ๐บ๐ธ Pittsburgh | 208 | 1984 |
| 28 | [Newterra](https://www.tamtam.ai/c/newterra) (newterra.com)
Experts in designing, engineering, manufacturing, and servicing environmental water and wastewater treatment solutions globally to renew ecosystems with reliability and value | Environmental Services | ๐บ๐ธ Coraopolis | 207 | 1863 |
| 29 | [Green Home Solutions](https://www.tamtam.ai/c/green-home-solutions) (greenhomesolutions.com)
Green Home Solutions offers plant-based mold removal, probiotic air cleaning, hospital grade disinfection, odor elimination, duct cleaning, and crawlspace encapsulation services | Environmental Services | ๐บ๐ธ Spring Mills | 186 | 2013 |
| 30 | [Chester Engineers, Inc](https://www.tamtam.ai/c/chester-engineers-inc) (chesterengineers.com)
An engineering services firm providing energy, water, and wastewater solutions to public and industrial clients nationwide and globally since 1910 | Civil Engineering | ๐บ๐ธ Moon Township | 84 | 1910 |
| 31 | [Well Service Group (a Newpark Company)](https://www.tamtam.ai/c/well-service-group-a-newpark-company) (newpark.com)
A diversified service provider to energy, construction, water treatment, and industrial markets offering containment services, rig mats, facility construction, and more | Oil and Gas | ๐บ๐ธ Blairsville | 58 | |
| 32 | [Shelton Associates, Inc.](https://www.tamtam.ai/c/shelton-associates-inc) (sheltonassoc.com)
A leader in water treatment solutions, specializing in advanced systems for industrial applications with a focus on innovation, expertise, and customized solutions | Environmental Services | ๐บ๐ธ Lancaster | 36 | 1994 |
| 33 | [Klenzoid, Inc.](https://www.tamtam.ai/c/klenzoid-inc) (www2.klenzoidinc.com)
A full-service water treatment organization dedicated to assisting partners in maintaining safe and efficient water systems | Facilities Services | ๐บ๐ธ Conshohocken | 27 | |
| 34 | [Keystone Technology Management](https://www.tamtam.ai/c/keystone-technology-management) (keystonetm.com)
IT asset management provider offering investment recovery programs, certified for data security, environmental standards, and worker safety, serving clients worldwide | IT Services and IT Consulting | ๐บ๐ธ Langhorne | 17 | 2001 |
| 35 | [Chemtech International Inc](https://www.tamtam.ai/c/chemtech-international-inc) (chemtech-us.com)
Global solutions provider for manufacturing needs in various industries, with emphasis on sustainability Specializing in wastewater testing, pharmaceutical manufacturing, gas valves, and spill containment | Manufacturing | ๐บ๐ธ West Chester | 3 | 1984 |
## 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 Illinois](https://www.tamtam.ai/l/environmental-services-companies-illinois) (34)
- [Environmental services companies in Washington State](https://www.tamtam.ai/l/environmental-services-companies-washington-state) (29)
- [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-pennsylvania